{"id":102132,"date":"2026-09-08T07:52:35","date_gmt":"2026-09-07T23:52:35","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/102132.html"},"modified":"2026-09-08T07:52:35","modified_gmt":"2026-09-07T23:52:35","slug":"%e4%b8%80%e4%b8%aa%e5%9c%ba%e6%99%af%e9%a2%98%e5%8e%bb%e7%90%86%e8%a7%a3%e9%94%81","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/102132.html","title":{"rendered":"\u4e00\u4e2a\u573a\u666f\u9898\u53bb\u7406\u89e3\u9501"},"content":{"rendered":"<p>Java \u5e76\u53d1\u91cc\u6700\u5bb9\u6613\u6df7\u6dc6\u7684\u51e0\u4e2a\u8bcd\u662f&#xff1a;\u9501\u3001\u539f\u5b50\u6027\u3001\u53ef\u89c1\u6027\u3001\u6709\u5e8f\u6027\u3001\u7ebf\u7a0b\u5b89\u5168\u3002\u5f88\u591a\u95ee\u9898\u8868\u9762\u4e0a\u90fd\u50cf\u201c\u52a0\u4e2a\u9501\u5c31\u884c\u201d&#xff0c;\u4f46\u80cc\u540e\u7684\u95ee\u9898\u53ef\u80fd\u5b8c\u5168\u4e0d\u540c&#xff1a;<\/p>\n<ul>\n<li>\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u6539\u4e00\u4e2a\u53d8\u91cf&#xff0c;\u7ed3\u679c\u4e22\u5931&#xff0c;\u8fd9\u662f\u539f\u5b50\u6027\u95ee\u9898&#xff1b;<\/li>\n<li>\u4e00\u4e2a\u7ebf\u7a0b\u6539\u4e86\u53d8\u91cf&#xff0c;\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u770b\u4e0d\u5230&#xff0c;\u8fd9\u662f\u53ef\u89c1\u6027\u95ee\u9898&#xff1b;<\/li>\n<li>\u4ee3\u7801\u987a\u5e8f\u770b\u8d77\u6765\u6ca1\u95ee\u9898&#xff0c;\u8fd0\u884c\u65f6\u56e0\u4e3a\u91cd\u6392\u5e8f\u51fa\u73b0\u5f02\u5e38&#xff0c;\u8fd9\u662f\u6709\u5e8f\u6027\u95ee\u9898&#xff1b;<\/li>\n<li>\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bbf\u95ee\u4e00\u4e2a\u4e0d\u53ef\u5e76\u53d1\u7684\u8d44\u6e90&#xff0c;\u8fd9\u662f\u4e92\u65a5\u95ee\u9898&#xff1b;<\/li>\n<li>\u8bfb\u591a\u5199\u5c11\u65f6\u6240\u6709\u64cd\u4f5c\u90fd\u4e92\u65a5&#xff0c;\u541e\u5410\u5dee&#xff0c;\u8fd9\u662f\u5e76\u53d1\u7c92\u5ea6\u95ee\u9898\u3002<\/li>\n<\/ul>\n<p>\u672c\u6587\u4f1a\u56f4\u7ed5\u4e09\u6761\u4e3b\u7ebf\u5c55\u5f00&#xff1a;<\/p>\n<ul>\n<li>Java \u5e38\u89c1\u9501\u7684\u533a\u522b\u4e0e\u5b9e\u73b0\u539f\u7406&#xff1b;<\/li>\n<li>volatile \u80fd\u89e3\u51b3\u4ec0\u4e48&#xff0c;\u4e0d\u80fd\u89e3\u51b3\u4ec0\u4e48&#xff1b;<\/li>\n<li>count &#061; count &#043; 1 \u5230\u5e95\u662f\u4e0d\u662f\u539f\u5b50\u64cd\u4f5c&#xff1b;<\/li>\n<li>\u7528\u4e00\u4e2a\u97f3\u89c6\u9891\u5b9e\u4f8b\u5316\u5bf9\u8c61\u540c\u65f6\u8bbf\u95ee\u5171\u4eab\u8d44\u6e90\u7684\u573a\u666f\u9898&#xff0c;\u5bf9\u6bd4\u51e0\u79cd\u52a0\u9501\u5b9e\u73b0\u65b9\u6848\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>1. \u5e76\u53d1\u95ee\u9898\u7684\u56db\u4e2a\u57fa\u672c\u6982\u5ff5<\/h3>\n<p>\u5728\u8ba8\u8bba\u5177\u4f53\u5de5\u5177\u4e4b\u524d&#xff0c;\u5148\u5206\u6e05\u56db\u4e2a\u6982\u5ff5\u3002<\/p>\n<table>\n<tr>\u6982\u5ff5\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898\u5e38\u89c1\u624b\u6bb5<\/tr>\n<tbody>\n<tr>\n<td>\u539f\u5b50\u6027<\/td>\n<td>\u4e00\u4e2a\u64cd\u4f5c\u4e0d\u80fd\u88ab\u5176\u4ed6\u7ebf\u7a0b\u770b\u5230\u4e2d\u95f4\u72b6\u6001<\/td>\n<td>synchronized\u3001Lock\u3001CAS\u3001Atomic<\/td>\n<\/tr>\n<tr>\n<td>\u53ef\u89c1\u6027<\/td>\n<td>\u4e00\u4e2a\u7ebf\u7a0b\u5199\u5165\u540e&#xff0c;\u5176\u4ed6\u7ebf\u7a0b\u80fd\u53ca\u65f6\u770b\u5230<\/td>\n<td>volatile\u3001\u9501\u3001\u7ebf\u7a0b\u542f\u52a8\/\u7ed3\u675f\u89c4\u5219<\/td>\n<\/tr>\n<tr>\n<td>\u6709\u5e8f\u6027<\/td>\n<td>\u907f\u514d\u5173\u952e\u8bfb\u5199\u88ab\u9519\u8bef\u91cd\u6392\u5e8f<\/td>\n<td>volatile\u3001\u9501\u3001final\u3001\u5b89\u5168\u53d1\u5e03<\/td>\n<\/tr>\n<tr>\n<td>\u4e92\u65a5<\/td>\n<td>\u540c\u4e00\u65f6\u95f4\u53ea\u5141\u8bb8\u4e00\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\u4e34\u754c\u533a<\/td>\n<td>synchronized\u3001ReentrantLock\u3001Semaphore<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5f88\u591a\u521d\u5b66\u8005\u4f1a\u628a\u5b83\u4eec\u6df7\u6210\u4e00\u53e5\u8bdd&#xff1a;\u201c\u7ebf\u7a0b\u4e0d\u5b89\u5168\u201d\u3002\u4f46\u5b9a\u4f4d\u95ee\u9898\u65f6\u5fc5\u987b\u62c6\u5f00\u3002<\/p>\n<p>\u4f8b\u5982&#xff1a;<\/p>\n<p><span class=\"token keyword\">volatile<\/span> <span class=\"token keyword\">int<\/span> count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">increase<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    count <span class=\"token operator\">&#061;<\/span> count <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>volatile \u53ef\u4ee5\u8ba9\u5176\u4ed6\u7ebf\u7a0b\u66f4\u5feb\u770b\u5230 count \u7684\u6700\u65b0\u503c&#xff0c;\u4f46\u4e0d\u80fd\u8ba9 count &#043; 1 \u53d8\u6210\u4e0d\u53ef\u5206\u5272\u7684\u539f\u5b50\u64cd\u4f5c\u3002\u6240\u4ee5\u8fd9\u6bb5\u4ee3\u7801\u4ecd\u7136\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u8ba1\u6570\u5668\u3002<\/p>\n<hr \/>\n<h3>2. Java \u5185\u5b58\u6a21\u578b\u8981\u7406\u89e3\u4ec0\u4e48<\/h3>\n<p>Java \u5e76\u53d1\u4e0d\u76f4\u63a5\u627f\u8bfa\u201c\u6bcf\u6b21\u8bfb\u5199\u90fd\u9a6c\u4e0a\u8bbf\u95ee\u4e3b\u5185\u5b58\u201d\u3002\u4e3a\u4e86\u6027\u80fd&#xff0c;\u7ebf\u7a0b\u53ef\u80fd\u4f7f\u7528\u5bc4\u5b58\u5668\u3001CPU \u7f13\u5b58\u3001\u5199\u7f13\u51b2\u548c\u7f16\u8bd1\u5668\u4f18\u5316\u3002Java \u5185\u5b58\u6a21\u578b\u5b9a\u4e49\u7684\u662f\u4e00\u5957\u62bd\u8c61\u89c4\u5219&#xff1a;\u5728\u4ec0\u4e48\u60c5\u51b5\u4e0b&#xff0c;\u4e00\u4e2a\u7ebf\u7a0b\u7684\u5199\u5165\u5bf9\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u53ef\u89c1\u3002<\/p>\n<p>\u53ef\u4ee5\u7b80\u5316\u7406\u89e3\u4e3a&#xff1a;<\/p>\n<p>\u7ebf\u7a0b A \u5199\u53d8\u91cf<br \/>\n-&gt; \u5982\u679c\u6ca1\u6709\u5efa\u7acb happens-before \u5173\u7cfb<br \/>\n-&gt; \u7ebf\u7a0b B \u4e0d\u4e00\u5b9a\u7acb\u523b\u770b\u5230&#xff0c;\u4e5f\u4e0d\u4e00\u5b9a\u6309\u4f60\u60f3\u8c61\u7684\u987a\u5e8f\u770b\u5230<\/p>\n<p>\u5e38\u89c1 happens-before \u5173\u7cfb\u5305\u62ec&#xff1a;<\/p>\n<ul>\n<li>\u5bf9\u540c\u4e00\u628a\u9501\u7684 unlock happens-before \u540e\u7eed lock&#xff1b;<\/li>\n<li>\u5bf9 volatile \u53d8\u91cf\u7684\u5199 happens-before \u540e\u7eed\u5bf9\u540c\u4e00\u53d8\u91cf\u7684\u8bfb&#xff1b;<\/li>\n<li>\u7ebf\u7a0b\u8c03\u7528 start() \u4e4b\u524d\u7684\u64cd\u4f5c happens-before \u65b0\u7ebf\u7a0b\u4e2d\u7684\u64cd\u4f5c&#xff1b;<\/li>\n<li>\u4e00\u4e2a\u7ebf\u7a0b\u4e2d\u7684\u64cd\u4f5c\u6309\u7a0b\u5e8f\u987a\u5e8f happens-before \u540e\u7eed\u64cd\u4f5c&#xff1b;<\/li>\n<li>final \u5b57\u6bb5\u5728\u6784\u9020\u5b8c\u6210\u540e\u7684\u5b89\u5168\u53d1\u5e03\u6709\u7279\u6b8a\u4fdd\u8bc1&#xff1b;<\/li>\n<li>Thread.join() \u8fd4\u56de\u540e&#xff0c;\u53ef\u4ee5\u770b\u5230\u76ee\u6807\u7ebf\u7a0b\u7ed3\u675f\u524d\u7684\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u89e3\u91ca\u4e86\u4e3a\u4ec0\u4e48\u9501\u4e0d\u53ea\u662f\u201c\u4e92\u65a5\u201d\u3002\u9501\u8fd8\u63d0\u4f9b\u5185\u5b58\u8bed\u4e49&#xff1a;<\/p>\n<p>\u8fdb\u5165\u9501&#xff1a;\u5237\u65b0\u5e76\u8bfb\u53d6\u53ef\u89c1\u6570\u636e<br \/>\n\u9000\u51fa\u9501&#xff1a;\u628a\u4e34\u754c\u533a\u5185\u7684\u4fee\u6539\u53d1\u5e03\u51fa\u53bb<\/p>\n<hr \/>\n<h3>3. synchronized \u7684\u539f\u7406\u548c\u4f5c\u7528<\/h3>\n<p>synchronized \u662f Java \u5185\u7f6e\u9501&#xff0c;\u4e5f\u53eb\u76d1\u89c6\u5668\u9501\u3002\u5b83\u53ef\u4ee5\u4fee\u9970\u4ee3\u7801\u5757\u548c\u65b9\u6cd5&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Counter<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">int<\/span> count<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">synchronized<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">increase<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        count<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">synchronized<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> count<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u7b49\u4ef7\u4e8e\u9501\u4f4f\u5f53\u524d\u5b9e\u4f8b\u5bf9\u8c61 this\u3002\u5982\u679c\u5199\u6210\u9759\u6001\u540c\u6b65\u65b9\u6cd5&#xff0c;\u5219\u9501\u4f4f Class \u5bf9\u8c61&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">GlobalCounter<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">int<\/span> count<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">synchronized<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">increase<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        count<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3.1 synchronized \u9501\u7684\u662f\u4ec0\u4e48<\/h4>\n<p>\u4efb\u4f55 Java \u5bf9\u8c61\u90fd\u53ef\u4ee5\u4f5c\u4e3a\u9501&#xff1a;<\/p>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">Object<\/span> lock <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">doWork<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span>lock<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u4e34\u754c\u533a<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u63a8\u8350\u4f7f\u7528\u79c1\u6709\u9501\u5bf9\u8c61&#xff0c;\u800c\u4e0d\u662f\u9501 this&#xff1a;<\/p>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">Object<\/span> lock <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u539f\u56e0\u662f this \u53ef\u80fd\u88ab\u5916\u90e8\u4ee3\u7801\u62ff\u5230\u5e76\u4f5c\u4e3a\u9501\u4f7f\u7528&#xff0c;\u6269\u5927\u9501\u7ade\u4e89\u8303\u56f4&#xff0c;\u751a\u81f3\u5f15\u5165\u6b7b\u9501\u3002<\/p>\n<h4>3.2 synchronized \u89e3\u51b3\u4ec0\u4e48<\/h4>\n<p>\u5b83\u540c\u65f6\u89e3\u51b3\u4e09\u7c7b\u95ee\u9898&#xff1a;<\/p>\n<ul>\n<li>\u4e92\u65a5&#xff1a;\u540c\u4e00\u65f6\u95f4\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u8fdb\u5165\u540c\u4e00\u628a\u9501\u4fdd\u62a4\u7684\u4e34\u754c\u533a&#xff1b;<\/li>\n<li>\u53ef\u89c1\u6027&#xff1a;\u91ca\u653e\u9501\u524d\u7684\u5199\u5165&#xff0c;\u5bf9\u540e\u7eed\u83b7\u53d6\u540c\u4e00\u628a\u9501\u7684\u7ebf\u7a0b\u53ef\u89c1&#xff1b;<\/li>\n<li>\u6709\u5e8f\u6027&#xff1a;\u9501\u8fb9\u754c\u9650\u5236\u5173\u952e\u8bfb\u5199\u7684\u91cd\u6392\u5e8f\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ConfigStore<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">Object<\/span> lock <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> config <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">update<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> newConfig<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span>lock<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            config <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span>newConfig<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> key<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span>lock<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> config<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3.3 synchronized \u7684\u4f18\u70b9<\/h4>\n<ul>\n<li>\u8bed\u6cd5\u7b80\u5355&#xff1b;<\/li>\n<li>\u81ea\u52a8\u91ca\u653e\u9501&#xff0c;\u5f02\u5e38\u65f6\u4e5f\u4e0d\u4f1a\u5fd8\u8bb0 unlock&#xff1b;<\/li>\n<li>JVM \u6df1\u5ea6\u4f18\u5316&#xff1b;<\/li>\n<li>\u53ef\u91cd\u5165&#xff1b;<\/li>\n<li>\u548c Java \u5185\u5b58\u6a21\u578b\u7ed3\u5408\u7d27\u5bc6&#xff1b;<\/li>\n<li>\u9002\u5408\u4fdd\u62a4\u77ed\u5c0f\u4e34\u754c\u533a\u3002<\/li>\n<\/ul>\n<h4>3.4 synchronized \u7684\u7f3a\u70b9<\/h4>\n<ul>\n<li>\u4e0d\u80fd\u5c1d\u8bd5\u52a0\u9501\u5931\u8d25\u540e\u7acb\u5373\u8fd4\u56de&#xff1b;<\/li>\n<li>\u4e0d\u80fd\u8bbe\u7f6e\u8d85\u65f6&#xff1b;<\/li>\n<li>\u4e0d\u80fd\u54cd\u5e94\u4e2d\u65ad\u7b49\u5f85&#xff1b;<\/li>\n<li>\u4e0d\u80fd\u50cf\u8bfb\u5199\u9501\u90a3\u6837\u533a\u5206\u8bfb\u9501\u548c\u5199\u9501&#xff1b;<\/li>\n<li>\u9ad8\u7ade\u4e89\u573a\u666f\u4e0b\u53ef\u80fd\u5f71\u54cd\u541e\u5410&#xff1b;<\/li>\n<li>\u9501\u7c92\u5ea6\u8bbe\u8ba1\u4e0d\u597d\u65f6\u5bb9\u6613\u628a\u65e0\u5173\u64cd\u4f5c\u4e32\u884c\u5316\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>4. ReentrantLock \u7684\u539f\u7406\u548c\u4f5c\u7528<\/h3>\n<p>ReentrantLock \u662f java.util.concurrent.locks \u5305\u4e2d\u7684\u663e\u5f0f\u9501\u3002<\/p>\n<p>\u5178\u578b\u5199\u6cd5&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Counter<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">ReentrantLock<\/span> lock <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ReentrantLock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">int<\/span> count<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">increase<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">lock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            count<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>finally \u5f88\u5173\u952e\u3002\u663e\u5f0f\u9501\u4e0d\u4f1a\u81ea\u52a8\u91ca\u653e&#xff0c;\u5982\u679c\u5fd8\u8bb0 unlock()&#xff0c;\u540e\u7eed\u7ebf\u7a0b\u53ef\u80fd\u6c38\u8fdc\u963b\u585e\u3002<\/p>\n<h4>4.1 \u5b83\u4e3a\u4ec0\u4e48\u53eb Reentrant<\/h4>\n<p>Reentrant \u8868\u793a\u53ef\u91cd\u5165\u3002\u540c\u4e00\u4e2a\u7ebf\u7a0b\u5df2\u7ecf\u62ff\u5230\u9501\u540e&#xff0c;\u53ef\u4ee5\u518d\u6b21\u62ff\u540c\u4e00\u628a\u9501&#xff1a;<\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">outer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">lock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">inner<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">inner<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">lock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u540c\u4e00\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u518d\u6b21\u8fdb\u5165<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u9501\u5185\u90e8\u4f1a\u8bb0\u5f55\u6301\u6709\u7ebf\u7a0b\u548c\u91cd\u5165\u6b21\u6570\u3002\u52a0\u9501\u51e0\u6b21&#xff0c;\u5c31\u8981\u91ca\u653e\u51e0\u6b21\u3002<\/p>\n<h4>4.2 ReentrantLock \u6bd4 synchronized \u591a\u4ec0\u4e48\u80fd\u529b<\/h4>\n<table>\n<tr>\u80fd\u529b\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>tryLock()<\/td>\n<td>\u5c1d\u8bd5\u52a0\u9501&#xff0c;\u5931\u8d25\u53ef\u4ee5\u7acb\u5373\u8fd4\u56de<\/td>\n<\/tr>\n<tr>\n<td>tryLock(timeout)<\/td>\n<td>\u5728\u6307\u5b9a\u65f6\u95f4\u5185\u7b49\u5f85\u9501<\/td>\n<\/tr>\n<tr>\n<td>lockInterruptibly()<\/td>\n<td>\u7b49\u9501\u671f\u95f4\u53ef\u4ee5\u54cd\u5e94\u4e2d\u65ad<\/td>\n<\/tr>\n<tr>\n<td>\u516c\u5e73\u9501<\/td>\n<td>\u53ef\u4ee5\u6309\u7b49\u5f85\u987a\u5e8f\u83b7\u53d6\u9501&#xff0c;\u4f46\u541e\u5410\u53ef\u80fd\u4e0b\u964d<\/td>\n<\/tr>\n<tr>\n<td>\u591a\u4e2a Condition<\/td>\n<td>\u4e00\u628a\u9501\u53ef\u4ee5\u6709\u591a\u4e2a\u7b49\u5f85\u961f\u5217<\/td>\n<\/tr>\n<tr>\n<td>\u663e\u5f0f\u91ca\u653e<\/td>\n<td>\u53ef\u4ee5\u8de8\u65b9\u6cd5\u7ec4\u7ec7&#xff0c;\u4f46\u66f4\u5bb9\u6613\u51fa\u9519<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u793a\u4f8b&#xff1a;\u907f\u514d\u957f\u65f6\u95f4\u7b49\u5f85\u8d44\u6e90\u521d\u59cb\u5316\u9501\u3002<\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">tryLock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">TimeUnit<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">MILLISECONDS<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">initCodec<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">IllegalStateException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Codec resource is busy&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>4.3 \u516c\u5e73\u9501\u548c\u975e\u516c\u5e73\u9501<\/h4>\n<p>\u521b\u5efa\u516c\u5e73\u9501&#xff1a;<\/p>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">ReentrantLock<\/span> lock <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ReentrantLock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u516c\u5e73\u9501\u5c3d\u91cf\u6309\u7b49\u5f85\u987a\u5e8f\u5524\u9192\u7ebf\u7a0b&#xff0c;\u51cf\u5c11\u9965\u997f\u3002\u975e\u516c\u5e73\u9501\u5141\u8bb8\u540e\u6765\u7ebf\u7a0b\u63d2\u961f&#xff0c;\u901a\u5e38\u541e\u5410\u66f4\u9ad8\u3002<\/p>\n<p>\u9009\u62e9\u5efa\u8bae&#xff1a;<\/p>\n<ul>\n<li>\u5927\u591a\u6570\u4e1a\u52a1\u4ee3\u7801\u4f7f\u7528\u9ed8\u8ba4\u975e\u516c\u5e73\u9501&#xff1b;<\/li>\n<li>\u5bf9\u7b49\u5f85\u987a\u5e8f\u6709\u5f3a\u8981\u6c42\u65f6\u624d\u7528\u516c\u5e73\u9501&#xff1b;<\/li>\n<li>\u97f3\u89c6\u9891\u5b9e\u65f6\u573a\u666f\u901a\u5e38\u66f4\u5173\u6ce8\u5ef6\u8fdf\u548c\u541e\u5410&#xff0c;\u4e0d\u4e00\u5b9a\u9002\u5408\u516c\u5e73\u9501&#xff1b;<\/li>\n<li>\u516c\u5e73\u9501\u4e0d\u7b49\u4e8e\u7edd\u5bf9\u516c\u5e73&#xff0c;\u4e5f\u4e0d\u7b49\u4e8e\u6027\u80fd\u66f4\u597d\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>5. ReadWriteLock&#xff1a;\u8bfb\u591a\u5199\u5c11\u573a\u666f<\/h3>\n<p>ReentrantReadWriteLock \u628a\u9501\u5206\u6210\u8bfb\u9501\u548c\u5199\u9501&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MediaConfigCache<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">ReentrantReadWriteLock<\/span> rwLock <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ReentrantReadWriteLock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">Lock<\/span> readLock <span class=\"token operator\">&#061;<\/span> rwLock<span class=\"token punctuation\">.<\/span><span class=\"token function\">readLock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">Lock<\/span> writeLock <span class=\"token operator\">&#061;<\/span> rwLock<span class=\"token punctuation\">.<\/span><span class=\"token function\">writeLock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> config <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> key<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        readLock<span class=\"token punctuation\">.<\/span><span class=\"token function\">lock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> config<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            readLock<span class=\"token punctuation\">.<\/span><span class=\"token function\">unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">update<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> newConfig<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        writeLock<span class=\"token punctuation\">.<\/span><span class=\"token function\">lock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            config <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span>newConfig<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            writeLock<span class=\"token punctuation\">.<\/span><span class=\"token function\">unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u89c4\u5219&#xff1a;<\/p>\n<ul>\n<li>\u591a\u4e2a\u8bfb\u7ebf\u7a0b\u53ef\u4ee5\u540c\u65f6\u6301\u6709\u8bfb\u9501&#xff1b;<\/li>\n<li>\u5199\u7ebf\u7a0b\u6301\u6709\u5199\u9501\u65f6&#xff0c;\u5176\u4ed6\u8bfb\u5199\u90fd\u963b\u585e&#xff1b;<\/li>\n<li>\u8bfb\u9501\u548c\u5199\u9501\u4fdd\u62a4\u7684\u662f\u540c\u4e00\u4efd\u6570\u636e&#xff1b;<\/li>\n<li>\u9002\u5408\u8bfb\u591a\u5199\u5c11&#xff0c;\u4e14\u8bfb\u64cd\u4f5c\u4e0d\u662f\u6781\u77ed\u7684\u573a\u666f\u3002<\/li>\n<\/ul>\n<h4>5.1 \u4f18\u70b9<\/h4>\n<ul>\n<li>\u8bfb\u591a\u5199\u5c11\u65f6\u541e\u5410\u6bd4\u4e92\u65a5\u9501\u9ad8&#xff1b;<\/li>\n<li>API \u660e\u786e\u8868\u8fbe\u8bfb\u548c\u5199\u7684\u610f\u56fe&#xff1b;<\/li>\n<li>\u9002\u5408\u914d\u7f6e\u8868\u3001\u8def\u7531\u8868\u3001\u7f13\u5b58\u5feb\u7167\u3002<\/li>\n<\/ul>\n<h4>5.2 \u7f3a\u70b9<\/h4>\n<ul>\n<li>\u4ee3\u7801\u590d\u6742\u5ea6\u9ad8\u4e8e\u4e92\u65a5\u9501&#xff1b;<\/li>\n<li>\u9501\u5347\u7ea7\u5bb9\u6613\u51fa\u95ee\u9898&#xff1b;<\/li>\n<li>\u5199\u64cd\u4f5c\u53ef\u80fd\u88ab\u5927\u91cf\u8bfb\u64cd\u4f5c\u5f71\u54cd&#xff1b;<\/li>\n<li>\u5982\u679c\u8bfb\u64cd\u4f5c\u5f88\u77ed&#xff0c;\u6536\u76ca\u53ef\u80fd\u4e0d\u660e\u663e&#xff1b;<\/li>\n<li>\u5982\u679c\u5199\u64cd\u4f5c\u9891\u7e41&#xff0c;\u53ef\u80fd\u6bd4\u666e\u901a\u9501\u66f4\u5dee\u3002<\/li>\n<\/ul>\n<h4>5.3 \u9501\u964d\u7ea7\u53ef\u4ee5&#xff0c;\u9501\u5347\u7ea7\u8981\u8c28\u614e<\/h4>\n<p>\u9501\u964d\u7ea7\u662f\u5148\u6301\u6709\u5199\u9501&#xff0c;\u518d\u83b7\u53d6\u8bfb\u9501&#xff0c;\u7136\u540e\u91ca\u653e\u5199\u9501&#xff1a;<\/p>\n<p>writeLock<span class=\"token punctuation\">.<\/span><span class=\"token function\">lock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">updateCache<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    readLock<span class=\"token punctuation\">.<\/span><span class=\"token function\">lock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    writeLock<span class=\"token punctuation\">.<\/span><span class=\"token function\">unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">readCache<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    readLock<span class=\"token punctuation\">.<\/span><span class=\"token function\">unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u9501\u5347\u7ea7\u662f\u6301\u6709\u8bfb\u9501\u65f6\u518d\u5c1d\u8bd5\u83b7\u53d6\u5199\u9501&#xff0c;\u5bb9\u6613\u6b7b\u9501\u6216\u957f\u65f6\u95f4\u7b49\u5f85\u3002\u4e0d\u8981\u968f\u624b\u8fd9\u4e48\u5199\u3002<\/p>\n<hr \/>\n<h3>6. StampedLock&#xff1a;\u4e50\u89c2\u8bfb\u548c\u7248\u672c\u6233<\/h3>\n<p>StampedLock \u662f\u66f4\u504f\u6027\u80fd\u4f18\u5316\u7684\u9501&#xff0c;\u652f\u6301&#xff1a;<\/p>\n<ul>\n<li>\u5199\u9501&#xff1b;<\/li>\n<li>\u60b2\u89c2\u8bfb\u9501&#xff1b;<\/li>\n<li>\u4e50\u89c2\u8bfb\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Position<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">StampedLock<\/span> lock <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">StampedLock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">double<\/span> x<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">double<\/span> y<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">double<\/span> <span class=\"token function\">distanceFromOrigin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> stamp <span class=\"token operator\">&#061;<\/span> lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">tryOptimisticRead<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">double<\/span> currentX <span class=\"token operator\">&#061;<\/span> x<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">double<\/span> currentY <span class=\"token operator\">&#061;<\/span> y<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">validate<\/span><span class=\"token punctuation\">(<\/span>stamp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            stamp <span class=\"token operator\">&#061;<\/span> lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">readLock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                currentX <span class=\"token operator\">&#061;<\/span> x<span class=\"token punctuation\">;<\/span><br \/>\n                currentY <span class=\"token operator\">&#061;<\/span> y<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">unlockRead<\/span><span class=\"token punctuation\">(<\/span>stamp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">Math<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">hypot<\/span><span class=\"token punctuation\">(<\/span>currentX<span class=\"token punctuation\">,<\/span> currentY<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">void<\/span> <span class=\"token function\">move<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">double<\/span> newX<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">double<\/span> newY<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> stamp <span class=\"token operator\">&#061;<\/span> lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">writeLock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            x <span class=\"token operator\">&#061;<\/span> newX<span class=\"token punctuation\">;<\/span><br \/>\n            y <span class=\"token operator\">&#061;<\/span> newY<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">unlockWrite<\/span><span class=\"token punctuation\">(<\/span>stamp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4e50\u89c2\u8bfb\u7684\u601d\u60f3\u662f&#xff1a;<\/p>\n<p>\u5148\u4e0d\u963b\u585e\u5199\u7ebf\u7a0b<br \/>\n\u8bfb\u53d6\u4e00\u4efd\u6570\u636e<br \/>\n\u68c0\u67e5\u8bfb\u53d6\u671f\u95f4\u6709\u6ca1\u6709\u5199\u53d1\u751f<br \/>\n\u5982\u679c\u6ca1\u6709&#xff0c;\u7ed3\u679c\u53ef\u7528<br \/>\n\u5982\u679c\u6709&#xff0c;\u9000\u5316\u6210\u60b2\u89c2\u8bfb\u9501\u91cd\u65b0\u8bfb<\/p>\n<h4>6.1 \u4f18\u70b9<\/h4>\n<ul>\n<li>\u8bfb\u591a\u5199\u5c11\u4e14\u8bfb\u64cd\u4f5c\u8f83\u9891\u7e41\u65f6\u6027\u80fd\u5f88\u597d&#xff1b;<\/li>\n<li>\u4e50\u89c2\u8bfb\u51cf\u5c11\u8bfb\u5199\u4e92\u65a5&#xff1b;<\/li>\n<li>\u9002\u5408\u5750\u6807\u3001\u72b6\u6001\u5feb\u7167\u3001\u7edf\u8ba1\u4fe1\u606f\u7b49\u573a\u666f\u3002<\/li>\n<\/ul>\n<h4>6.2 \u7f3a\u70b9<\/h4>\n<ul>\n<li>\u4e0d\u53ef\u91cd\u5165&#xff1b;<\/li>\n<li>\u4f7f\u7528\u590d\u6742&#xff1b;<\/li>\n<li>stamp \u7528\u9519\u4f1a\u51fa bug&#xff1b;<\/li>\n<li>\u4e0d\u9002\u5408\u4e34\u754c\u533a\u91cc\u8c03\u7528\u590d\u6742\u4e1a\u52a1\u903b\u8f91&#xff1b;<\/li>\n<li>\u4e0d\u9002\u5408\u65b0\u624b\u9ed8\u8ba4\u4f7f\u7528&#xff1b;<\/li>\n<li>\u7b49\u5f85\u9501\u65f6\u5bf9\u4e2d\u65ad\u652f\u6301\u4e0d\u5982 ReentrantLock \u76f4\u89c2\u3002<\/li>\n<\/ul>\n<p>StampedLock \u4e0d\u662f ReadWriteLock \u7684\u65e0\u8111\u66ff\u4ee3&#xff0c;\u5b83\u662f\u9762\u5411\u7279\u5b9a\u573a\u666f\u7684\u6027\u80fd\u5de5\u5177\u3002<\/p>\n<hr \/>\n<h3>7. volatile \u7684\u4f5c\u7528\u548c\u8fb9\u754c<\/h3>\n<p>volatile \u662f Java \u5173\u952e\u5b57&#xff0c;\u7528\u5728\u5b57\u6bb5\u4e0a&#xff1a;<\/p>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token keyword\">volatile<\/span> <span class=\"token keyword\">boolean<\/span> released<span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5b83\u4e3b\u8981\u63d0\u4f9b\u4e24\u7c7b\u8bed\u4e49&#xff1a;<\/p>\n<ul>\n<li>\u5bf9\u8be5\u53d8\u91cf\u7684\u5199&#xff0c;\u5bf9\u540e\u7eed\u8bfb\u8be5\u53d8\u91cf\u7684\u7ebf\u7a0b\u53ef\u89c1&#xff1b;<\/li>\n<li>\u9650\u5236\u76f8\u5173\u8bfb\u5199\u91cd\u6392\u5e8f&#xff0c;\u5efa\u7acb happens-before \u5173\u7cfb\u3002<\/li>\n<\/ul>\n<h4>7.1 volatile \u9002\u5408\u4ec0\u4e48<\/h4>\n<p>\u9002\u5408\u4e00\u4e2a\u7ebf\u7a0b\u5199&#xff0c;\u5176\u4ed6\u7ebf\u7a0b\u8bfb\u7684\u72b6\u6001\u6807\u8bb0&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">PlayerLoop<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">volatile<\/span> <span class=\"token keyword\">boolean<\/span> running <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">stop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        running <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">loop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>running<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">decodeOneFrame<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5982\u679c\u6ca1\u6709 volatile&#xff0c;\u5faa\u73af\u7ebf\u7a0b\u53ef\u80fd\u957f\u65f6\u95f4\u770b\u4e0d\u5230 running &#061; false\u3002<\/p>\n<p>\u4e5f\u9002\u5408\u5b89\u5168\u53d1\u5e03\u4e0d\u53ef\u53d8\u5bf9\u8c61\u5f15\u7528&#xff1a;<\/p>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token keyword\">volatile<\/span> <span class=\"token class-name\">MediaConfig<\/span> config <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">MediaConfig<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">defaultConfig<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">MediaConfig<\/span> <span class=\"token function\">getConfig<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> config<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">updateConfig<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MediaConfig<\/span> newConfig<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    config <span class=\"token operator\">&#061;<\/span> newConfig<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u524d\u63d0\u662f MediaConfig \u672c\u8eab\u4e0d\u53ef\u53d8&#xff0c;\u6216\u8005\u66f4\u65b0\u65f6\u6574\u4f53\u66ff\u6362\u5f15\u7528&#xff0c;\u800c\u4e0d\u662f\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u4fee\u6539\u5185\u90e8\u5b57\u6bb5\u3002<\/p>\n<h4>7.2 volatile \u4e0d\u9002\u5408\u4ec0\u4e48<\/h4>\n<p>\u4e0d\u9002\u5408\u590d\u5408\u64cd\u4f5c&#xff1a;<\/p>\n<p><span class=\"token keyword\">volatile<\/span> <span class=\"token keyword\">int<\/span> count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">increase<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    count<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4e0d\u9002\u5408\u4fdd\u62a4\u591a\u4e2a\u53d8\u91cf\u7684\u4e0d\u53d8\u5f0f&#xff1a;<\/p>\n<p><span class=\"token keyword\">volatile<\/span> <span class=\"token keyword\">int<\/span> width<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">volatile<\/span> <span class=\"token keyword\">int<\/span> height<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">resize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> w<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> h<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    width <span class=\"token operator\">&#061;<\/span> w<span class=\"token punctuation\">;<\/span><br \/>\n    height <span class=\"token operator\">&#061;<\/span> h<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8bfb\u7ebf\u7a0b\u53ef\u80fd\u770b\u5230\u65b0 width \u548c\u65e7 height \u7684\u6df7\u5408\u72b6\u6001\u3002\u5982\u679c width \u548c height \u5fc5\u987b\u6210\u5bf9\u4e00\u81f4&#xff0c;\u5e94\u4f7f\u7528\u9501\u6216\u4e0d\u53ef\u53d8\u5bf9\u8c61\u6574\u4f53\u66ff\u6362&#xff1a;<\/p>\n<p><span class=\"token keyword\">record<\/span> <span class=\"token class-name\">Size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> width<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> height<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token keyword\">volatile<\/span> <span class=\"token class-name\">Size<\/span> size <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">resize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> width<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> height<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    size <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Size<\/span><span class=\"token punctuation\">(<\/span>width<span class=\"token punctuation\">,<\/span> height<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>7.3 volatile \u548c\u9501\u7684\u533a\u522b<\/h4>\n<table>\n<tr>\u5bf9\u6bd4\u9879volatile\u9501<\/tr>\n<tbody>\n<tr>\n<td>\u4e92\u65a5<\/td>\n<td>\u4e0d\u63d0\u4f9b<\/td>\n<td>\u63d0\u4f9b<\/td>\n<\/tr>\n<tr>\n<td>\u53ef\u89c1\u6027<\/td>\n<td>\u63d0\u4f9b<\/td>\n<td>\u63d0\u4f9b<\/td>\n<\/tr>\n<tr>\n<td>\u6709\u5e8f\u6027<\/td>\n<td>\u63d0\u4f9b\u4e00\u90e8\u5206\u5173\u952e\u4fdd\u8bc1<\/td>\n<td>\u63d0\u4f9b\u9501\u8fb9\u754c\u4fdd\u8bc1<\/td>\n<\/tr>\n<tr>\n<td>\u539f\u5b50\u6027<\/td>\n<td>\u53ea\u4fdd\u8bc1\u5355\u6b21 volatile \u8bfb\u5199\u539f\u5b50&#xff0c;\u4e0d\u4fdd\u8bc1\u590d\u5408\u64cd\u4f5c<\/td>\n<td>\u4e34\u754c\u533a\u6574\u4f53\u539f\u5b50<\/td>\n<\/tr>\n<tr>\n<td>\u963b\u585e<\/td>\n<td>\u4e0d\u963b\u585e<\/td>\n<td>\u53ef\u80fd\u963b\u585e<\/td>\n<\/tr>\n<tr>\n<td>\u9002\u5408\u573a\u666f<\/td>\n<td>\u72b6\u6001\u6807\u8bb0\u3001\u914d\u7f6e\u5f15\u7528\u3001\u5b89\u5168\u53d1\u5e03<\/td>\n<td>\u591a\u53d8\u91cf\u4e00\u81f4\u6027\u3001\u590d\u5408\u66f4\u65b0\u3001\u4e34\u754c\u533a<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4e00\u53e5\u8bdd&#xff1a;<\/p>\n<p>volatile \u662f\u53ef\u89c1\u6027\u5de5\u5177&#xff0c;\u4e0d\u662f\u4e92\u65a5\u5de5\u5177\u3002<\/p>\n<hr \/>\n<h3>8. count &#043; 1 \u662f\u4e0d\u662f\u539f\u5b50\u64cd\u4f5c<\/h3>\n<p>\u7ed3\u8bba\u5148\u8bf4&#xff1a;<\/p>\n<p>count &#061; count &#043; 1 \u4e0d\u662f\u539f\u5b50\u64cd\u4f5c<br \/>\ncount&#043;&#043; \u4e5f\u4e0d\u662f\u539f\u5b50\u64cd\u4f5c<br \/>\n&#043;&#043;count \u4e5f\u4e0d\u662f\u539f\u5b50\u64cd\u4f5c<\/p>\n<p>\u5b83\u770b\u8d77\u6765\u662f\u4e00\u884c\u4ee3\u7801&#xff0c;\u4f46\u903b\u8f91\u4e0a\u81f3\u5c11\u5305\u542b\u4e09\u6b65&#xff1a;<\/p>\n<p>1. \u8bfb\u53d6 count \u5f53\u524d\u503c<br \/>\n2. \u8ba1\u7b97 count &#043; 1<br \/>\n3. \u628a\u7ed3\u679c\u5199\u56de count<\/p>\n<p>\u4e24\u4e2a\u7ebf\u7a0b\u540c\u65f6\u6267\u884c\u65f6\u53ef\u80fd\u8fd9\u6837&#xff1a;<\/p>\n<p>\u521d\u59cb count &#061; 0<\/p>\n<p>\u7ebf\u7a0b A \u8bfb\u53d6 count &#061; 0<br \/>\n\u7ebf\u7a0b B \u8bfb\u53d6 count &#061; 0<br \/>\n\u7ebf\u7a0b A \u8ba1\u7b97 0 &#043; 1 &#061; 1<br \/>\n\u7ebf\u7a0b B \u8ba1\u7b97 0 &#043; 1 &#061; 1<br \/>\n\u7ebf\u7a0b A \u5199\u56de count &#061; 1<br \/>\n\u7ebf\u7a0b B \u5199\u56de count &#061; 1<\/p>\n<p>\u671f\u671b\u7ed3\u679c 2&#xff0c;\u5b9e\u9645\u7ed3\u679c 1<\/p>\n<p>\u8fd9\u5c31\u662f\u5178\u578b\u7684\u66f4\u65b0\u4e22\u5931\u3002<\/p>\n<h4>8.1 volatile int count \u662f\u5426\u80fd\u89e3\u51b3<\/h4>\n<p>\u4e0d\u80fd\u3002<\/p>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token keyword\">volatile<\/span> <span class=\"token keyword\">int<\/span> count<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">increase<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    count <span class=\"token operator\">&#061;<\/span> count <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>volatile \u4fdd\u8bc1\u6bcf\u6b21\u8bfb\u5230\u7684\u503c\u5c3d\u91cf\u662f\u6700\u65b0\u53d1\u5e03\u7684\u503c&#xff0c;\u4f46\u4e0d\u80fd\u4fdd\u8bc1\u201c\u8bfb\u3001\u52a0\u3001\u5199\u201d\u4e09\u6b65\u4e4b\u95f4\u4e0d\u88ab\u5176\u4ed6\u7ebf\u7a0b\u63d2\u5165\u3002<\/p>\n<h4>8.2 \u7528 synchronized \u89e3\u51b3<\/h4>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SafeCounter<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">int<\/span> count<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">synchronized<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">increase<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        count<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">synchronized<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> count<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4f18\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u7b80\u5355&#xff1b;<\/li>\n<li>\u6b63\u786e&#xff1b;<\/li>\n<li>\u540c\u65f6\u4fdd\u8bc1\u539f\u5b50\u6027\u548c\u53ef\u89c1\u6027\u3002<\/li>\n<\/ul>\n<p>\u7f3a\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u9ad8\u7ade\u4e89\u4e0b\u53ef\u80fd\u963b\u585e&#xff1b;<\/li>\n<li>\u6240\u6709\u8c03\u7528\u4e32\u884c\u3002<\/li>\n<\/ul>\n<h4>8.3 \u7528 ReentrantLock \u89e3\u51b3<\/h4>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SafeCounter<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">ReentrantLock<\/span> lock <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ReentrantLock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">int<\/span> count<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">increase<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">lock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            count<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">lock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> count<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4f18\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u53ef\u4ee5\u8d85\u65f6\u3001\u53ef\u4e2d\u65ad\u3001\u53ef\u5c1d\u8bd5\u83b7\u53d6\u9501&#xff1b;<\/li>\n<li>\u53ef\u6269\u5c55\u5230 Condition\u3002<\/li>\n<\/ul>\n<p>\u7f3a\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u4ee3\u7801\u66f4\u5570\u55e6&#xff1b;<\/li>\n<li>\u5fd8\u8bb0 unlock \u4f1a\u9020\u6210\u4e25\u91cd\u95ee\u9898\u3002<\/li>\n<\/ul>\n<h4>8.4 \u7528 AtomicInteger \u89e3\u51b3<\/h4>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SafeCounter<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">AtomicInteger<\/span> count <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">AtomicInteger<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">increase<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        count<span class=\"token punctuation\">.<\/span><span class=\"token function\">incrementAndGet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> count<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>AtomicInteger \u5e95\u5c42\u901a\u8fc7 CAS \u601d\u60f3\u5b9e\u73b0\u539f\u5b50\u66f4\u65b0\u3002\u7b80\u5316\u8fc7\u7a0b\u662f&#xff1a;<\/p>\n<p>\u8bfb\u53d6\u65e7\u503c old<br \/>\n\u8ba1\u7b97\u65b0\u503c new &#061; old &#043; 1<br \/>\n\u5c1d\u8bd5\u628a\u5185\u5b58\u4e2d\u7684 old \u6539\u6210 new<br \/>\n\u5982\u679c\u671f\u95f4\u6ca1\u6709\u5176\u4ed6\u7ebf\u7a0b\u6539\u8fc7&#xff0c;\u6210\u529f<br \/>\n\u5982\u679c\u5931\u8d25&#xff0c;\u91cd\u65b0\u8bfb\u53d6\u5e76\u91cd\u8bd5<\/p>\n<p>\u4f18\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u65e0\u663e\u5f0f\u9501&#xff1b;<\/li>\n<li>\u8ba1\u6570\u3001\u72b6\u6001\u4f4d\u3001\u7b80\u5355\u5f15\u7528\u66ff\u6362\u975e\u5e38\u5408\u9002&#xff1b;<\/li>\n<li>\u4f4e\u5230\u4e2d\u7b49\u7ade\u4e89\u4e0b\u6027\u80fd\u597d\u3002<\/li>\n<\/ul>\n<p>\u7f3a\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u53ea\u80fd\u8868\u8fbe\u8f83\u7b80\u5355\u7684\u539f\u5b50\u66f4\u65b0&#xff1b;<\/li>\n<li>\u9ad8\u7ade\u4e89\u4e0b CAS \u81ea\u65cb\u91cd\u8bd5\u4f1a\u6d88\u8017 CPU&#xff1b;<\/li>\n<li>\u591a\u53d8\u91cf\u4e00\u81f4\u6027\u4e0d\u9002\u5408\u5355\u4e2a Atomic&#xff1b;<\/li>\n<li>\u5bb9\u6613\u9047\u5230 ABA \u95ee\u9898&#xff0c;\u9700\u8981\u989d\u5916\u8bbe\u8ba1\u3002<\/li>\n<\/ul>\n<h4>8.5 \u7528 LongAdder \u89e3\u51b3\u9ad8\u5e76\u53d1\u8ba1\u6570<\/h4>\n<p>\u9ad8\u5e76\u53d1\u7edf\u8ba1\u573a\u666f\u53ef\u4ee5\u7528&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MetricsCounter<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">LongAdder<\/span> count <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LongAdder<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">increase<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        count<span class=\"token punctuation\">.<\/span><span class=\"token function\">increment<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token function\">sum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> count<span class=\"token punctuation\">.<\/span><span class=\"token function\">sum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>LongAdder \u901a\u8fc7\u5206\u6563\u70ed\u70b9\u51cf\u5c11\u7ade\u4e89&#xff0c;\u9002\u5408\u9ad8\u5e76\u53d1\u7d2f\u52a0\u6307\u6807\u3002<\/p>\n<p>\u6ce8\u610f&#xff1a;<\/p>\n<ul>\n<li>sum() \u4e0d\u662f\u5f3a\u4e00\u81f4\u77ac\u65f6\u5feb\u7167&#xff1b;<\/li>\n<li>\u4e0d\u9002\u5408\u4f59\u989d\u3001\u5e93\u5b58\u8fd9\u7c7b\u5fc5\u987b\u4e25\u683c\u51c6\u786e\u7684\u540c\u6b65\u51b3\u7b56&#xff1b;<\/li>\n<li>\u9002\u5408 QPS\u3001\u64ad\u653e\u5e27\u6570\u3001\u4e22\u5e27\u7edf\u8ba1\u7b49\u6307\u6807\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>9. CAS\u3001Atomic \u548c\u9501\u7684\u533a\u522b<\/h3>\n<table>\n<tr>\u65b9\u6848\u539f\u7406\u9002\u5408\u573a\u666f\u4e0d\u9002\u5408\u573a\u666f<\/tr>\n<tbody>\n<tr>\n<td>\u9501<\/td>\n<td>\u8fdb\u5165\u4e34\u754c\u533a\u524d\u4e92\u65a5<\/td>\n<td>\u590d\u6742\u72b6\u6001\u3001\u591a\u53d8\u91cf\u4e00\u81f4\u6027\u3001\u8d44\u6e90\u8bbf\u95ee<\/td>\n<td>\u6781\u9ad8\u9891\u7b80\u5355\u8ba1\u6570<\/td>\n<\/tr>\n<tr>\n<td>CAS \/ Atomic<\/td>\n<td>\u6bd4\u8f83\u5e76\u4ea4\u6362&#xff0c;\u5931\u8d25\u91cd\u8bd5<\/td>\n<td>\u7b80\u5355\u8ba1\u6570\u3001\u72b6\u6001\u5207\u6362\u3001\u5f15\u7528\u66ff\u6362<\/td>\n<td>\u590d\u6742\u4e34\u754c\u533a\u3001\u963b\u585e IO<\/td>\n<\/tr>\n<tr>\n<td>LongAdder<\/td>\n<td>\u5206\u6563\u8ba1\u6570\u70ed\u70b9<\/td>\n<td>\u9ad8\u5e76\u53d1\u7edf\u8ba1\u6307\u6807<\/td>\n<td>\u9700\u8981\u5f3a\u4e00\u81f4\u8bfb\u53d6\u7684\u4e1a\u52a1\u503c<\/td>\n<\/tr>\n<tr>\n<td>volatile<\/td>\n<td>\u53ef\u89c1\u6027\u548c\u6709\u5e8f\u6027<\/td>\n<td>\u72b6\u6001\u6807\u8bb0\u3001\u4e0d\u53ef\u53d8\u5f15\u7528\u53d1\u5e03<\/td>\n<td>\u590d\u5408\u66f4\u65b0\u3001\u4e92\u65a5\u8d44\u6e90<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5982\u679c\u4e00\u4e2a\u64cd\u4f5c\u5305\u542b\u4ee5\u4e0b\u7279\u5f81&#xff0c;\u4f18\u5148\u8003\u8651\u9501&#xff1a;<\/p>\n<ul>\n<li>\u8981\u540c\u65f6\u4fee\u6539\u591a\u4e2a\u5b57\u6bb5&#xff1b;<\/li>\n<li>\u8981\u68c0\u67e5\u540e\u518d\u6267\u884c&#xff1b;<\/li>\n<li>\u4e34\u754c\u533a\u5185\u6709\u8d44\u6e90\u751f\u547d\u5468\u671f&#xff1b;<\/li>\n<li>\u9700\u8981\u548c\u5916\u90e8\u7cfb\u7edf\u4ea4\u4e92&#xff1b;<\/li>\n<li>\u5931\u8d25\u65f6\u9700\u8981\u56de\u6eda&#xff1b;<\/li>\n<li>\u8981\u4fdd\u8bc1\u4e00\u7ec4\u72b6\u6001\u6c38\u8fdc\u4e00\u81f4\u3002<\/li>\n<\/ul>\n<p>\u5982\u679c\u53ea\u662f\u4e00\u4e2a\u8ba1\u6570\u6216\u72b6\u6001\u4f4d&#xff0c;\u4f18\u5148\u8003\u8651 Atomic\u3002<\/p>\n<hr \/>\n<h3>10. \u5e38\u89c1\u9501\u7684\u5b8c\u6574\u5bf9\u6bd4<\/h3>\n<table>\n<tr>\u9501\/\u5de5\u5177\u662f\u5426\u4e92\u65a5\u662f\u5426\u53ef\u91cd\u5165\u662f\u5426\u53ef\u4e2d\u65ad\u662f\u5426\u53ef\u8d85\u65f6\u5178\u578b\u7528\u9014<\/tr>\n<tbody>\n<tr>\n<td>synchronized<\/td>\n<td>\u662f<\/td>\n<td>\u662f<\/td>\n<td>\u7b49\u9501\u4e0d\u53ef\u4e2d\u65ad<\/td>\n<td>\u5426<\/td>\n<td>\u7b80\u5355\u4e34\u754c\u533a<\/td>\n<\/tr>\n<tr>\n<td>ReentrantLock<\/td>\n<td>\u662f<\/td>\n<td>\u662f<\/td>\n<td>\u652f\u6301<\/td>\n<td>\u652f\u6301<\/td>\n<td>\u590d\u6742\u4e92\u65a5\u3001\u8d85\u65f6\u3001Condition<\/td>\n<\/tr>\n<tr>\n<td>ReentrantReadWriteLock<\/td>\n<td>\u8bfb\u8bfb\u4e0d\u4e92\u65a5&#xff0c;\u5199\u4e92\u65a5<\/td>\n<td>\u662f<\/td>\n<td>\u652f\u6301<\/td>\n<td>\u652f\u6301<\/td>\n<td>\u8bfb\u591a\u5199\u5c11\u7f13\u5b58<\/td>\n<\/tr>\n<tr>\n<td>StampedLock<\/td>\n<td>\u652f\u6301\u8bfb\u5199\u548c\u4e50\u89c2\u8bfb<\/td>\n<td>\u5426<\/td>\n<td>\u4f7f\u7528\u590d\u6742<\/td>\n<td>\u90e8\u5206\u652f\u6301<\/td>\n<td>\u9ad8\u6027\u80fd\u8bfb\u591a\u5199\u5c11<\/td>\n<\/tr>\n<tr>\n<td>AtomicInteger<\/td>\n<td>\u4e0d\u52a0\u9501<\/td>\n<td>\u4e0d\u9002\u7528<\/td>\n<td>\u4e0d\u9002\u7528<\/td>\n<td>\u4e0d\u9002\u7528<\/td>\n<td>\u7b80\u5355\u539f\u5b50\u8ba1\u6570<\/td>\n<\/tr>\n<tr>\n<td>LongAdder<\/td>\n<td>\u4e0d\u52a0\u9501<\/td>\n<td>\u4e0d\u9002\u7528<\/td>\n<td>\u4e0d\u9002\u7528<\/td>\n<td>\u4e0d\u9002\u7528<\/td>\n<td>\u9ad8\u5e76\u53d1\u7edf\u8ba1<\/td>\n<\/tr>\n<tr>\n<td>Semaphore<\/td>\n<td>\u63a7\u5236\u8bb8\u53ef\u6570\u91cf<\/td>\n<td>\u4e0d\u9002\u7528<\/td>\n<td>\u652f\u6301<\/td>\n<td>\u652f\u6301<\/td>\n<td>\u9650\u6d41\u3001\u8d44\u6e90\u6c60<\/td>\n<\/tr>\n<tr>\n<td>CountDownLatch<\/td>\n<td>\u4e0d\u662f\u9501<\/td>\n<td>\u4e0d\u9002\u7528<\/td>\n<td>await \u53ef\u4e2d\u65ad<\/td>\n<td>\u652f\u6301<\/td>\n<td>\u7b49\u5f85\u591a\u4e2a\u4efb\u52a1\u5b8c\u6210<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>CountDownLatch \u7ecf\u5e38\u88ab\u8bef\u8ba4\u4e3a\u9501\u3002\u5b83\u4e0d\u662f\u7528\u6765\u4fdd\u62a4\u5171\u4eab\u8d44\u6e90\u7684&#xff0c;\u800c\u662f\u7528\u6765\u534f\u8c03\u7ebf\u7a0b\u7b49\u5f85&#xff1a;<\/p>\n<p><span class=\"token class-name\">CountDownLatch<\/span> latch <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">CountDownLatch<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">loadAudio<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    latch<span class=\"token punctuation\">.<\/span><span class=\"token function\">countDown<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">loadVideo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    latch<span class=\"token punctuation\">.<\/span><span class=\"token function\">countDown<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>latch<span class=\"token punctuation\">.<\/span><span class=\"token function\">await<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">startPlayback<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5b83\u89e3\u51b3\u7684\u662f\u201c\u7b49\u4e24\u4e2a\u4efb\u52a1\u5b8c\u6210\u518d\u7ee7\u7eed\u201d&#xff0c;\u4e0d\u662f\u201c\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u4fee\u6539\u5171\u4eab\u8d44\u6e90\u201d\u3002<\/p>\n<hr \/>\n<h3>11. \u573a\u666f\u9898&#xff1a;\u97f3\u89c6\u9891\u5bf9\u8c61\u540c\u65f6\u8bbf\u95ee\u4e00\u4e2a\u8d44\u6e90<\/h3>\n<h4>11.1 \u9898\u76ee<\/h4>\n<p>\u73b0\u5728\u6709\u4e00\u4e2a\u97f3\u89c6\u9891 SDK&#xff0c;\u9700\u8981\u540c\u65f6\u521d\u59cb\u5316\u97f3\u9891\u5bf9\u8c61\u548c\u89c6\u9891\u5bf9\u8c61&#xff1a;<\/p>\n<p>AudioEngine \u521d\u59cb\u5316\u65f6\u8981\u8bfb\u53d6\/\u5199\u5165 MediaResource<br \/>\nVideoEngine \u521d\u59cb\u5316\u65f6\u4e5f\u8981\u8bfb\u53d6\/\u5199\u5165 MediaResource<br \/>\nMediaResource \u5185\u90e8\u5305\u542b native handle\u3001\u914d\u7f6e\u8868\u3001\u7f13\u5b58\u76ee\u5f55\u548c\u8bbe\u5907\u72b6\u6001<br \/>\n\u540c\u4e00\u65f6\u95f4\u4e0d\u80fd\u6709\u4e24\u4e2a\u7ebf\u7a0b\u540c\u65f6\u6267\u884c initNative()<br \/>\n\u521d\u59cb\u5316\u5b8c\u6210\u540e&#xff0c;\u97f3\u9891\u548c\u89c6\u9891\u90fd\u53ef\u4ee5\u8bfb\u53d6\u914d\u7f6e<br \/>\n\u91ca\u653e\u65f6\u4e0d\u80fd\u548c\u521d\u59cb\u5316\u540c\u65f6\u53d1\u751f<\/p>\n<p>\u7b80\u5316\u4ee3\u7801&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MediaResource<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">long<\/span> nativeHandle<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">boolean<\/span> initialized<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">MediaConfig<\/span> config<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">void<\/span> <span class=\"token function\">initNative<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MediaConfig<\/span> config<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u52a0\u8f7d so\u3001\u6253\u5f00\u8bbe\u5907\u3001\u521b\u5efa codec\u3001\u7533\u8bf7 buffer<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">void<\/span> <span class=\"token function\">releaseNative<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u91ca\u653e native handle\u3001codec\u3001buffer<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4e24\u4e2a\u7ebf\u7a0b\u53ef\u80fd\u540c\u65f6\u8c03\u7528&#xff1a;<\/p>\n<p><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> audioEngine<span class=\"token punctuation\">.<\/span><span class=\"token function\">init<\/span><span class=\"token punctuation\">(<\/span>sharedResource<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> videoEngine<span class=\"token punctuation\">.<\/span><span class=\"token function\">init<\/span><span class=\"token punctuation\">(<\/span>sharedResource<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u8bf7\u95ee\u6709\u54ea\u4e9b\u52a0\u9501\u65b9\u6848&#xff1f;\u5404\u6709\u4ec0\u4e48\u4f18\u7f3a\u70b9&#xff1f;<\/p>\n<hr \/>\n<h3>12. \u65b9\u6848\u4e00&#xff1a;\u65b9\u6cd5\u7ea7 synchronized<\/h3>\n<p>\u6700\u7b80\u5355\u65b9\u5f0f\u662f\u628a\u8d44\u6e90\u7684\u5173\u952e\u65b9\u6cd5\u90fd\u8bbe\u4e3a\u540c\u6b65\u65b9\u6cd5&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MediaResource<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">long<\/span> nativeHandle<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">boolean<\/span> initialized<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">MediaConfig<\/span> config<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">synchronized<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">initialize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MediaConfig<\/span> newConfig<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>initialized<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        config <span class=\"token operator\">&#061;<\/span> newConfig<span class=\"token punctuation\">;<\/span><br \/>\n        nativeHandle <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">initNative<\/span><span class=\"token punctuation\">(<\/span>newConfig<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        initialized <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">synchronized<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">release<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>initialized<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token function\">releaseNative<\/span><span class=\"token punctuation\">(<\/span>nativeHandle<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        nativeHandle <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0L<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        initialized <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">synchronized<\/span> <span class=\"token class-name\">MediaConfig<\/span> <span class=\"token function\">getConfig<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> config<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u4f18\u70b9<\/h4>\n<ul>\n<li>\u5199\u6cd5\u6700\u7b80\u5355&#xff1b;<\/li>\n<li>\u4e0d\u5bb9\u6613\u5fd8\u8bb0\u91ca\u653e\u9501&#xff1b;<\/li>\n<li>\u539f\u5b50\u6027\u3001\u53ef\u89c1\u6027\u3001\u4e92\u65a5\u4e00\u6b21\u89e3\u51b3&#xff1b;<\/li>\n<li>\u9002\u5408\u521d\u59cb\u5316\u8fc7\u7a0b\u77ed\u3001\u8bbf\u95ee\u9891\u7387\u4f4e\u7684\u8d44\u6e90&#xff1b;<\/li>\n<li>\u5bf9\u9762\u8bd5\u548c\u5c0f\u9879\u76ee\u6700\u5bb9\u6613\u8bb2\u6e05\u695a\u3002<\/li>\n<\/ul>\n<h4>\u7f3a\u70b9<\/h4>\n<ul>\n<li>\u9501\u4f4f\u7684\u662f this&#xff0c;\u5916\u90e8\u4ee3\u7801\u4e5f\u53ef\u80fd\u62ff resource \u5f53\u9501&#xff1b;<\/li>\n<li>\u8bfb\u914d\u7f6e\u4e5f\u88ab\u521d\u59cb\u5316\u548c\u91ca\u653e\u963b\u585e&#xff1b;<\/li>\n<li>\u65e0\u6cd5\u8bbe\u7f6e\u7b49\u5f85\u8d85\u65f6&#xff1b;<\/li>\n<li>\u7b49\u5f85\u9501\u671f\u95f4\u4e0d\u80fd\u54cd\u5e94\u4e2d\u65ad&#xff1b;<\/li>\n<li>\u5982\u679c initNative() \u5f88\u6162&#xff0c;\u9501\u4f1a\u6301\u6709\u5f88\u4e45&#xff1b;<\/li>\n<li>synchronized \u65b9\u6cd5\u7c92\u5ea6\u5bb9\u6613\u8d8a\u6765\u8d8a\u7c97\u3002<\/li>\n<\/ul>\n<p>\u9002\u7528\u5224\u65ad&#xff1a;<\/p>\n<p>\u8d44\u6e90\u751f\u547d\u5468\u671f\u7b80\u5355 &#043; \u521d\u59cb\u5316\u4f4e\u9891 &#043; \u56e2\u961f\u9700\u8981\u4f18\u5148\u4fdd\u8bc1\u6b63\u786e\u6027<\/p>\n<hr \/>\n<h3>13. \u65b9\u6848\u4e8c&#xff1a;\u79c1\u6709\u9501\u5bf9\u8c61 &#043; \u7f29\u5c0f\u4e34\u754c\u533a<\/h3>\n<p>\u66f4\u63a8\u8350\u7528\u79c1\u6709\u9501\u5bf9\u8c61&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MediaResource<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">Object<\/span> lock <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">long<\/span> nativeHandle<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">boolean<\/span> initialized<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">MediaConfig<\/span> config<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">initialize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MediaConfig<\/span> newConfig<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span>lock<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>initialized<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            config <span class=\"token operator\">&#061;<\/span> newConfig<span class=\"token punctuation\">;<\/span><br \/>\n            nativeHandle <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">initNative<\/span><span class=\"token punctuation\">(<\/span>newConfig<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            initialized <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">release<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span>lock<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>initialized<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token function\">releaseNative<\/span><span class=\"token punctuation\">(<\/span>nativeHandle<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            nativeHandle <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0L<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            initialized <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">MediaConfig<\/span> <span class=\"token function\">getConfig<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span>lock<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> config<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u4f18\u70b9<\/h4>\n<ul>\n<li>\u9501\u5bf9\u8c61\u4e0d\u4f1a\u66b4\u9732\u7ed9\u5916\u90e8&#xff1b;<\/li>\n<li>\u4e92\u65a5\u8303\u56f4\u66f4\u53ef\u63a7&#xff1b;<\/li>\n<li>\u8bed\u4e49\u6bd4\u9501 this \u66f4\u6e05\u695a&#xff1b;<\/li>\n<li>\u81ea\u52a8\u91ca\u653e\u9501&#xff1b;<\/li>\n<li>\u9002\u5408\u7edd\u5927\u591a\u6570\u8d44\u6e90\u751f\u547d\u5468\u671f\u4fdd\u62a4\u3002<\/li>\n<\/ul>\n<h4>\u7f3a\u70b9<\/h4>\n<ul>\n<li>\u4ecd\u7136\u4e0d\u80fd\u8d85\u65f6\u6216\u4e2d\u65ad\u7b49\u5f85&#xff1b;<\/li>\n<li>\u8bfb\u5199\u4ecd\u7136\u4e92\u65a5&#xff1b;<\/li>\n<li>\u5982\u679c native \u521d\u59cb\u5316\u5f88\u6162&#xff0c;\u5176\u4ed6\u8bfb\u5199\u90fd\u88ab\u963b\u585e&#xff1b;<\/li>\n<li>\u4e34\u754c\u533a\u91cc\u8c03\u7528\u5916\u90e8\u56de\u8c03\u53ef\u80fd\u6b7b\u9501\u3002<\/li>\n<\/ul>\n<p>\u91cd\u8981\u539f\u5219&#xff1a;<\/p>\n<p>\u4e34\u754c\u533a\u91cc\u53ea\u505a\u5fc5\u987b\u4e92\u65a5\u7684\u72b6\u6001\u8bfb\u5199&#xff0c;\u4e0d\u8981\u8c03\u7528\u4e0d\u53ef\u63a7\u5916\u90e8\u56de\u8c03\u3002<\/p>\n<p>\u5982\u679c initNative() \u5f88\u8017\u65f6&#xff0c;\u53ef\u4ee5\u62c6\u6210\u4e24\u9636\u6bb5&#xff0c;\u4f46\u8981\u975e\u5e38\u5c0f\u5fc3\u72b6\u6001\u7ade\u4e89\u3002<\/p>\n<hr \/>\n<h3>14. \u65b9\u6848\u4e09&#xff1a;ReentrantLock &#043; \u8d85\u65f6\u5931\u8d25<\/h3>\n<p>\u97f3\u89c6\u9891\u8d44\u6e90\u5e38\u5e38\u5bf9\u5ef6\u8fdf\u654f\u611f\u3002\u5982\u679c\u9501\u88ab\u5360\u7528\u592a\u4e45&#xff0c;\u4e0e\u5176\u65e0\u9650\u7b49\u5f85&#xff0c;\u4e0d\u5982\u5feb\u901f\u5931\u8d25\u6216\u964d\u7ea7\u3002<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MediaResource<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">ReentrantLock<\/span> lock <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ReentrantLock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">long<\/span> nativeHandle<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">boolean<\/span> initialized<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">MediaConfig<\/span> config<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">initialize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MediaConfig<\/span> newConfig<span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">throws<\/span> <span class=\"token class-name\">InterruptedException<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">tryLock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">300<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">TimeUnit<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">MILLISECONDS<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">IllegalStateException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Media resource is busy&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>initialized<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            config <span class=\"token operator\">&#061;<\/span> newConfig<span class=\"token punctuation\">;<\/span><br \/>\n            nativeHandle <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">initNative<\/span><span class=\"token punctuation\">(<\/span>newConfig<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            initialized <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">release<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">lock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>initialized<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token function\">releaseNative<\/span><span class=\"token punctuation\">(<\/span>nativeHandle<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            nativeHandle <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0L<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            initialized <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u4f18\u70b9<\/h4>\n<ul>\n<li>\u53ef\u4ee5 tryLock()&#xff0c;\u907f\u514d\u65e0\u9650\u7b49\u5f85&#xff1b;<\/li>\n<li>\u53ef\u4ee5\u8bbe\u7f6e\u8d85\u65f6&#xff1b;<\/li>\n<li>\u53ef\u4ee5\u54cd\u5e94\u4e2d\u65ad&#xff1b;<\/li>\n<li>\u53ef\u9009\u62e9\u516c\u5e73\u9501&#xff1b;<\/li>\n<li>\u80fd\u914d\u5408 Condition \u505a\u590d\u6742\u72b6\u6001\u7b49\u5f85&#xff1b;<\/li>\n<li>\u9002\u5408\u64ad\u653e\u5668\u3001\u7f16\u7801\u5668\u3001\u8bbe\u5907\u8d44\u6e90\u7b49\u9700\u8981\u8d85\u65f6\u63a7\u5236\u7684\u573a\u666f\u3002<\/li>\n<\/ul>\n<h4>\u7f3a\u70b9<\/h4>\n<ul>\n<li>\u5fc5\u987b\u624b\u52a8 unlock&#xff1b;<\/li>\n<li>\u4ee3\u7801\u6bd4 synchronized \u66f4\u7e41\u7410&#xff1b;<\/li>\n<li>\u9501\u91ca\u653e\u8def\u5f84\u5fc5\u987b\u7ecf\u8fc7\u4e25\u683c review&#xff1b;<\/li>\n<li>\u516c\u5e73\u9501\u53ef\u80fd\u964d\u4f4e\u541e\u5410&#xff1b;<\/li>\n<li>\u5f02\u5e38\u5904\u7406\u4e0d\u5f53\u4f1a\u5bfc\u81f4\u8d44\u6e90\u72b6\u6001\u534a\u521d\u59cb\u5316\u3002<\/li>\n<\/ul>\n<p>\u9002\u7528\u5224\u65ad&#xff1a;<\/p>\n<p>\u8d44\u6e90\u521d\u59cb\u5316\u53ef\u80fd\u6162 &#043; \u8c03\u7528\u65b9\u9700\u8981\u8d85\u65f6\u6216\u53d6\u6d88 &#043; \u5931\u8d25\u53ef\u4ee5\u964d\u7ea7\u5904\u7406<\/p>\n<hr \/>\n<h3>15. \u65b9\u6848\u56db&#xff1a;\u8bfb\u5199\u9501\u4fdd\u62a4\u914d\u7f6e&#xff0c;\u4e92\u65a5\u9501\u4fdd\u62a4\u751f\u547d\u5468\u671f<\/h3>\n<p>\u5982\u679c\u521d\u59cb\u5316\u548c\u91ca\u653e\u5f88\u5c11&#xff0c;\u8bfb\u53d6\u914d\u7f6e\u5f88\u591a&#xff0c;\u53ef\u4ee5\u62c6\u6210&#xff1a;<\/p>\n<ul>\n<li>\u751f\u547d\u5468\u671f\u64cd\u4f5c\u7528\u4e92\u65a5\u9501&#xff1b;<\/li>\n<li>\u914d\u7f6e\u8bfb\u53d6\u7528\u8bfb\u5199\u9501&#xff1b;<\/li>\n<li>\u66f4\u65b0\u914d\u7f6e\u7528\u5199\u9501\u3002<\/li>\n<\/ul>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MediaResource<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">ReentrantReadWriteLock<\/span> configLock <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ReentrantReadWriteLock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">Lock<\/span> readLock <span class=\"token operator\">&#061;<\/span> configLock<span class=\"token punctuation\">.<\/span><span class=\"token function\">readLock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">Lock<\/span> writeLock <span class=\"token operator\">&#061;<\/span> configLock<span class=\"token punctuation\">.<\/span><span class=\"token function\">writeLock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">Object<\/span> lifecycleLock <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">long<\/span> nativeHandle<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">boolean<\/span> initialized<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">MediaConfig<\/span> config <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">MediaConfig<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">defaultConfig<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">initialize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MediaConfig<\/span> newConfig<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span>lifecycleLock<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>initialized<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>            writeLock<span class=\"token punctuation\">.<\/span><span class=\"token function\">lock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                config <span class=\"token operator\">&#061;<\/span> newConfig<span class=\"token punctuation\">;<\/span><br \/>\n                nativeHandle <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">initNative<\/span><span class=\"token punctuation\">(<\/span>newConfig<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                initialized <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                writeLock<span class=\"token punctuation\">.<\/span><span class=\"token function\">unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">MediaConfig<\/span> <span class=\"token function\">getConfig<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        readLock<span class=\"token punctuation\">.<\/span><span class=\"token function\">lock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> config<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            readLock<span class=\"token punctuation\">.<\/span><span class=\"token function\">unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u4f18\u70b9<\/h4>\n<ul>\n<li>\u591a\u4e2a\u8bfb\u53d6\u914d\u7f6e\u7684\u7ebf\u7a0b\u53ef\u4ee5\u5e76\u53d1&#xff1b;<\/li>\n<li>\u914d\u7f6e\u8bfb\u53d6\u4e0d\u4f1a\u548c\u5176\u4ed6\u914d\u7f6e\u8bfb\u53d6\u4e92\u65a5&#xff1b;<\/li>\n<li>\u9002\u5408\u64ad\u653e\u8fc7\u7a0b\u4e2d\u9891\u7e41\u8bfb\u53d6\u53ea\u8bfb\u914d\u7f6e&#xff1b;<\/li>\n<li>\u6bd4\u6240\u6709\u65b9\u6cd5 synchronized \u541e\u5410\u66f4\u597d\u3002<\/li>\n<\/ul>\n<h4>\u7f3a\u70b9<\/h4>\n<ul>\n<li>\u4e24\u628a\u9501\u540c\u65f6\u5b58\u5728&#xff0c;\u9501\u987a\u5e8f\u5fc5\u987b\u56fa\u5b9a&#xff1b;<\/li>\n<li>\u5bb9\u6613\u5f15\u5165\u6b7b\u9501&#xff1b;<\/li>\n<li>\u4ee3\u7801\u590d\u6742\u5ea6\u660e\u663e\u4e0a\u5347&#xff1b;<\/li>\n<li>\u5982\u679c\u8bfb\u53d6\u5f88\u77ed&#xff0c;\u8bfb\u5199\u9501\u6536\u76ca\u4e0d\u4e00\u5b9a\u660e\u663e&#xff1b;<\/li>\n<li>\u5982\u679c\u751f\u547d\u5468\u671f\u548c\u914d\u7f6e\u5f3a\u7ed1\u5b9a&#xff0c;\u62c6\u9501\u53cd\u800c\u5371\u9669\u3002<\/li>\n<\/ul>\n<p>\u9501\u987a\u5e8f\u5fc5\u987b\u7edf\u4e00&#xff1a;<\/p>\n<p>\u6c38\u8fdc\u5148\u62ff lifecycleLock&#xff0c;\u518d\u62ff writeLock<br \/>\n\u4e0d\u8981\u5728\u6301\u6709 readLock \u65f6\u5c1d\u8bd5 initialize\/release<\/p>\n<p>\u9002\u7528\u5224\u65ad&#xff1a;<\/p>\n<p>\u8bfb\u914d\u7f6e\u975e\u5e38\u9891\u7e41 &#043; \u5199\u914d\u7f6e\u5f88\u5c11 &#043; \u56e2\u961f\u80fd\u7ef4\u62a4\u6e05\u695a\u9501\u987a\u5e8f<\/p>\n<hr \/>\n<h3>16. \u65b9\u6848\u4e94&#xff1a;Atomic \u72b6\u6001\u673a &#043; \u9501\u4fdd\u62a4\u8d44\u6e90<\/h3>\n<p>\u6709\u4e9b\u573a\u666f\u9700\u8981\u907f\u514d\u91cd\u590d\u521d\u59cb\u5316&#xff0c;\u540c\u65f6\u51c6\u786e\u8868\u8fbe\u72b6\u6001&#xff1a;<\/p>\n<p>NEW -&gt; INITIALIZING -&gt; READY -&gt; RELEASING -&gt; RELEASED<\/p>\n<p>\u53ef\u4ee5\u7528 AtomicReference \u7ba1\u7406\u72b6\u6001&#xff0c;\u518d\u7528\u9501\u4fdd\u62a4\u771f\u6b63\u7684 native handle&#xff1a;<\/p>\n<p><span class=\"token keyword\">enum<\/span> <span class=\"token class-name\">ResourceState<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token constant\">NEW<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token constant\">INITIALIZING<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token constant\">READY<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token constant\">RELEASING<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    <span class=\"token constant\">RELEASED<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MediaResource<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">AtomicReference<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">ResourceState<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> state <span class=\"token operator\">&#061;<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">AtomicReference<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ResourceState<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">NEW<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">Object<\/span> nativeLock <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">long<\/span> nativeHandle<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">initialize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MediaConfig<\/span> config<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>state<span class=\"token punctuation\">.<\/span><span class=\"token function\">compareAndSet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ResourceState<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">NEW<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">ResourceState<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">INITIALIZING<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">long<\/span> handle <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">initNative<\/span><span class=\"token punctuation\">(<\/span>config<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span>nativeLock<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                nativeHandle <span class=\"token operator\">&#061;<\/span> handle<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            state<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ResourceState<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">READY<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">RuntimeException<\/span> error<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            state<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ResourceState<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">NEW<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">throw<\/span> error<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">release<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>state<span class=\"token punctuation\">.<\/span><span class=\"token function\">compareAndSet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ResourceState<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">READY<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">ResourceState<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">RELEASING<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">long<\/span> handle<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span>nativeLock<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            handle <span class=\"token operator\">&#061;<\/span> nativeHandle<span class=\"token punctuation\">;<\/span><br \/>\n            nativeHandle <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0L<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token function\">releaseNative<\/span><span class=\"token punctuation\">(<\/span>handle<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        state<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ResourceState<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">RELEASED<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u4f18\u70b9<\/h4>\n<ul>\n<li>\u72b6\u6001\u53d8\u5316\u660e\u786e&#xff1b;<\/li>\n<li>\u53ef\u4ee5\u5feb\u901f\u62d2\u7edd\u91cd\u590d\u521d\u59cb\u5316&#xff1b;<\/li>\n<li>\u4e0d\u5fc5\u6240\u6709\u7ebf\u7a0b\u90fd\u963b\u585e\u7b49\u5f85&#xff1b;<\/li>\n<li>\u9002\u5408\u64ad\u653e\u5668\u751f\u547d\u5468\u671f\u3001SDK \u521d\u59cb\u5316\u3001\u8fde\u63a5\u72b6\u6001\u7ba1\u7406&#xff1b;<\/li>\n<li>\u72b6\u6001\u53ef\u4ee5\u66b4\u9732\u7ed9\u76d1\u63a7\u6216\u65e5\u5fd7\u3002<\/li>\n<\/ul>\n<h4>\u7f3a\u70b9<\/h4>\n<ul>\n<li>\u72b6\u6001\u673a\u8bbe\u8ba1\u590d\u6742&#xff1b;<\/li>\n<li>CAS \u53ea\u4fdd\u62a4\u72b6\u6001&#xff0c;\u4e0d\u81ea\u52a8\u4fdd\u62a4\u8d44\u6e90\u5bf9\u8c61&#xff1b;<\/li>\n<li>\u521d\u59cb\u5316\u5931\u8d25\u548c\u56de\u6eda\u8def\u5f84\u5fc5\u987b\u4e25\u8c28&#xff1b;<\/li>\n<li>initNative() \u548c releaseNative() \u7684\u5e76\u53d1\u8fb9\u754c\u8981\u4ed4\u7ec6\u8bbe\u8ba1&#xff1b;<\/li>\n<li>\u5bb9\u6613\u51fa\u73b0\u72b6\u6001\u6b63\u786e\u4f46\u8d44\u6e90\u4e0d\u4e00\u81f4\u7684\u95ee\u9898\u3002<\/li>\n<\/ul>\n<p>\u9002\u7528\u5224\u65ad&#xff1a;<\/p>\n<p>\u751f\u547d\u5468\u671f\u72b6\u6001\u590d\u6742 &#043; \u9700\u8981\u5feb\u901f\u5931\u8d25 &#043; \u521d\u59cb\u5316\/\u91ca\u653e\u9700\u8981\u6e05\u6670\u72b6\u6001\u6d41\u8f6c<\/p>\n<hr \/>\n<h3>17. \u65b9\u6848\u516d&#xff1a;\u5355\u7ebf\u7a0b\u4e32\u884c\u5316\u8d44\u6e90\u8bbf\u95ee<\/h3>\n<p>\u97f3\u89c6\u9891\u8d44\u6e90\u6709\u65f6\u6700\u597d\u7684\u52a0\u9501\u65b9\u5f0f\u662f\u4e0d\u663e\u5f0f\u52a0\u9501&#xff0c;\u800c\u662f\u628a\u8d44\u6e90\u64cd\u4f5c\u6295\u9012\u5230\u540c\u4e00\u4e2a\u7ebf\u7a0b\u6267\u884c\u3002<\/p>\n<p>Android \u4e2d\u53ef\u4ee5\u7528 HandlerThread&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MediaResourceDispatcher<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">HandlerThread<\/span> thread <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HandlerThread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;MediaResourceThread&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">Handler<\/span> handler<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">MediaResource<\/span> resource <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">MediaResource<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token class-name\">MediaResourceDispatcher<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        thread<span class=\"token punctuation\">.<\/span><span class=\"token function\">start<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        handler <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Handler<\/span><span class=\"token punctuation\">(<\/span>thread<span class=\"token punctuation\">.<\/span><span class=\"token function\">getLooper<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">initialize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MediaConfig<\/span> config<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        handler<span class=\"token punctuation\">.<\/span><span class=\"token function\">post<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> resource<span class=\"token punctuation\">.<\/span><span class=\"token function\">initialize<\/span><span class=\"token punctuation\">(<\/span>config<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">release<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        handler<span class=\"token punctuation\">.<\/span><span class=\"token function\">post<\/span><span class=\"token punctuation\">(<\/span>resource<span class=\"token operator\">::<\/span><span class=\"token function\">release<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">shutdown<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        handler<span class=\"token punctuation\">.<\/span><span class=\"token function\">post<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            resource<span class=\"token punctuation\">.<\/span><span class=\"token function\">release<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            thread<span class=\"token punctuation\">.<\/span><span class=\"token function\">quitSafely<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4e5f\u53ef\u4ee5\u5728\u7eaf Java \u4e2d\u7528\u5355\u7ebf\u7a0b ExecutorService&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MediaResourceDispatcher<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">ExecutorService<\/span> executor <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Executors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">newSingleThreadExecutor<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">MediaResource<\/span> resource <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">MediaResource<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Future<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">initialize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MediaConfig<\/span> config<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> executor<span class=\"token punctuation\">.<\/span><span class=\"token function\">submit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> resource<span class=\"token punctuation\">.<\/span><span class=\"token function\">initialize<\/span><span class=\"token punctuation\">(<\/span>config<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Future<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">release<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> executor<span class=\"token punctuation\">.<\/span><span class=\"token function\">submit<\/span><span class=\"token punctuation\">(<\/span>resource<span class=\"token operator\">::<\/span><span class=\"token function\">release<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u4f18\u70b9<\/h4>\n<ul>\n<li>\u8d44\u6e90\u64cd\u4f5c\u5929\u7136\u4e32\u884c&#xff1b;<\/li>\n<li>\u5927\u5e45\u964d\u4f4e\u9501\u590d\u6742\u5ea6&#xff1b;<\/li>\n<li>\u5f88\u9002\u5408\u97f3\u89c6\u9891\u3001\u76f8\u673a\u3001\u64ad\u653e\u5668\u8fd9\u7c7b\u6709\u7ebf\u7a0b\u4eb2\u548c\u6027\u7684\u8d44\u6e90&#xff1b;<\/li>\n<li>\u8c03\u7528\u987a\u5e8f\u6e05\u6670&#xff1b;<\/li>\n<li>\u907f\u514d\u591a\u5904\u968f\u624b\u52a0\u9501\u3002<\/li>\n<\/ul>\n<h4>\u7f3a\u70b9<\/h4>\n<ul>\n<li>\u6240\u6709\u64cd\u4f5c\u6392\u961f&#xff0c;\u6162\u4efb\u52a1\u4f1a\u963b\u585e\u540e\u7eed\u4efb\u52a1&#xff1b;<\/li>\n<li>\u9700\u8981\u5904\u7406\u4efb\u52a1\u53d6\u6d88\u548c\u751f\u547d\u5468\u671f&#xff1b;<\/li>\n<li>\u540c\u6b65\u83b7\u53d6\u8fd4\u56de\u503c\u9700\u8981 Future\u3001callback \u6216\u534f\u7a0b\u5c01\u88c5&#xff1b;<\/li>\n<li>\u7ebf\u7a0b\u9000\u51fa\u65f6\u8981\u91ca\u653e\u8d44\u6e90&#xff1b;<\/li>\n<li>\u5982\u679c\u8c03\u7528\u65b9\u8bef\u4ee5\u4e3a\u65b9\u6cd5\u540c\u6b65\u5b8c\u6210&#xff0c;\u5bb9\u6613\u4ea7\u751f\u65f6\u5e8f bug\u3002<\/li>\n<\/ul>\n<p>\u9002\u7528\u5224\u65ad&#xff1a;<\/p>\n<p>\u8d44\u6e90\u5f3a\u4f9d\u8d56\u8c03\u7528\u987a\u5e8f &#043; native \u5bf9\u7ebf\u7a0b\u654f\u611f &#043; \u64cd\u4f5c\u53ef\u4ee5\u5f02\u6b65\u6392\u961f<\/p>\n<p>\u5728\u97f3\u89c6\u9891\u5de5\u7a0b\u91cc&#xff0c;\u8fd9\u901a\u5e38\u662f\u6211\u66f4\u504f\u597d\u7684\u65b9\u6848\u4e4b\u4e00&#xff1a;\u628a\u590d\u6742\u5e76\u53d1\u95ee\u9898\u53d8\u6210\u660e\u786e\u7684\u4e8b\u4ef6\u961f\u5217&#xff0c;\u8c03\u8bd5\u8d77\u6765\u4e5f\u66f4\u6709\u79e9\u5e8f\u3002<\/p>\n<hr \/>\n<h3>18. \u65b9\u6848\u4e03&#xff1a;\u4e0d\u53ef\u53d8\u5feb\u7167 &#043; volatile \u5f15\u7528<\/h3>\n<p>\u5982\u679c\u5171\u4eab\u8d44\u6e90\u4e2d\u53ea\u6709\u914d\u7f6e\u9700\u8981\u88ab\u591a\u4e2a\u7ebf\u7a0b\u8bfb\u53d6&#xff0c;\u53ef\u4ee5\u628a\u914d\u7f6e\u505a\u6210\u4e0d\u53ef\u53d8\u5bf9\u8c61&#xff0c;\u7528 volatile \u53d1\u5e03\u5f15\u7528&#xff1a;<\/p>\n<p><span class=\"token keyword\">record<\/span> <span class=\"token class-name\">MediaConfig<\/span><span class=\"token punctuation\">(<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> sampleRate<span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> channelCount<span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> width<span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> height<span class=\"token punctuation\">,<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> codecName<br \/>\n<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MediaConfigStore<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">volatile<\/span> <span class=\"token class-name\">MediaConfig<\/span> config <span class=\"token operator\">&#061;<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">MediaConfig<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">44100<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1920<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1080<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;h264&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">MediaConfig<\/span> <span class=\"token function\">getConfig<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> config<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">update<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MediaConfig<\/span> newConfig<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        config <span class=\"token operator\">&#061;<\/span> newConfig<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u4f18\u70b9<\/h4>\n<ul>\n<li>\u8bfb\u64cd\u4f5c\u65e0\u9501&#xff1b;<\/li>\n<li>\u53ef\u89c1\u6027\u597d&#xff1b;<\/li>\n<li>\u4ee3\u7801\u7b80\u5355&#xff1b;<\/li>\n<li>\u4e0d\u4f1a\u8bfb\u5230\u534a\u66f4\u65b0\u5bf9\u8c61&#xff1b;<\/li>\n<li>\u9002\u5408\u914d\u7f6e\u5feb\u7167\u3001\u5f00\u5173\u3001\u7b56\u7565\u8868\u5f15\u7528\u3002<\/li>\n<\/ul>\n<h4>\u7f3a\u70b9<\/h4>\n<ul>\n<li>\u53ea\u9002\u5408\u4e0d\u53ef\u53d8\u5bf9\u8c61\u6574\u4f53\u66ff\u6362&#xff1b;<\/li>\n<li>\u4e0d\u80fd\u4fdd\u62a4 native handle&#xff1b;<\/li>\n<li>\u4e0d\u80fd\u8868\u8fbe\u590d\u6742\u521d\u59cb\u5316\u548c\u91ca\u653e&#xff1b;<\/li>\n<li>\u66f4\u65b0\u9891\u7e41\u4e14\u5bf9\u8c61\u5f88\u5927\u65f6\u4f1a\u589e\u52a0\u5206\u914d&#xff1b;<\/li>\n<li>\u591a\u4e2a\u8d44\u6e90\u4e4b\u95f4\u7684\u4e00\u81f4\u6027\u4ecd\u7136\u9700\u8981\u989d\u5916\u673a\u5236\u3002<\/li>\n<\/ul>\n<p>\u9002\u7528\u5224\u65ad&#xff1a;<\/p>\n<p>\u5171\u4eab\u7684\u662f\u53ea\u8bfb\u914d\u7f6e\u5feb\u7167&#xff0c;\u800c\u4e0d\u662f\u9700\u8981\u4e92\u65a5\u8bbf\u95ee\u7684\u5e95\u5c42\u8d44\u6e90<\/p>\n<hr \/>\n<h3>19. \u573a\u666f\u9898\u63a8\u8350\u7b54\u6848<\/h3>\n<p>\u5982\u679c\u8fd9\u662f\u4e00\u4e2a\u9762\u8bd5\u9898&#xff0c;\u53ef\u4ee5\u8fd9\u6837\u56de\u7b54&#xff1a;<\/p>\n<p>\u5148\u5224\u65ad\u5171\u4eab\u8d44\u6e90\u662f\u4ec0\u4e48\u3002<br \/>\n\u5982\u679c\u53ea\u662f\u72b6\u6001\u6807\u8bb0&#xff0c;\u7528 volatile \u6216 Atomic\u3002<br \/>\n\u5982\u679c\u662f count &#043; 1 \u8fd9\u7c7b\u590d\u5408\u66f4\u65b0&#xff0c;\u7528 AtomicInteger \u6216\u9501\u3002<br \/>\n\u5982\u679c\u662f native handle\u3001codec\u3001\u6587\u4ef6\u53e5\u67c4\u8fd9\u79cd\u771f\u5b9e\u8d44\u6e90&#xff0c;\u7528\u9501\u6216\u5355\u7ebf\u7a0b\u4e32\u884c\u5316\u3002<br \/>\n\u5982\u679c\u8bfb\u591a\u5199\u5c11&#xff0c;\u53ef\u4ee5\u8003\u8651 ReadWriteLock\u3002<br \/>\n\u5982\u679c\u8d44\u6e90\u751f\u547d\u5468\u671f\u590d\u6742&#xff0c;\u53ef\u4ee5\u7528 Atomic \u72b6\u6001\u673a\u8868\u8fbe\u72b6\u6001&#xff0c;\u518d\u7528\u9501\u4fdd\u62a4\u8d44\u6e90\u3002<br \/>\n\u97f3\u89c6\u9891\u573a\u666f\u901a\u5e38\u8fd8\u8981\u8003\u8651\u7ebf\u7a0b\u4eb2\u548c\u6027\u3001\u521d\u59cb\u5316\u8d85\u65f6\u3001\u91ca\u653e\u987a\u5e8f\u548c\u56de\u8c03\u6b7b\u9501\u3002<\/p>\n<p>\u5982\u679c\u8fd9\u662f\u4e00\u4e2a\u5de5\u7a0b\u65b9\u6848&#xff0c;\u6211\u4f1a\u4f18\u5148\u63a8\u8350&#xff1a;<\/p>\n<p>\u8d44\u6e90\u751f\u547d\u5468\u671f\u64cd\u4f5c&#xff1a;\u5355\u7ebf\u7a0b dispatcher \u6216 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punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">AtomicReference<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">ResourceState<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> state <span class=\"token operator\">&#061;<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">AtomicReference<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ResourceState<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">NEW<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">volatile<\/span> <span class=\"token class-name\">MediaConfig<\/span> config <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">MediaConfig<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">defaultConfig<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">LongAdder<\/span> droppedFrames <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LongAdder<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Future<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Boolean<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">initialize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">MediaConfig<\/span> newConfig<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> mediaExecutor<span class=\"token punctuation\">.<\/span><span class=\"token function\">submit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>state<span class=\"token punctuation\">.<\/span><span class=\"token function\">compareAndSet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ResourceState<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">NEW<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">ResourceState<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">INITIALIZING<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                config <span class=\"token operator\">&#061;<\/span> newConfig<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token function\">initNative<\/span><span class=\"token punctuation\">(<\/span>newConfig<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                state<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ResourceState<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">READY<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">RuntimeException<\/span> error<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                state<span class=\"token punctuation\">.<\/span><span class=\"token function\">set<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ResourceState<\/span><span class=\"token punctuation\">.<\/span><span class=\"token constant\">NEW<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">throw<\/span> error<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">MediaConfig<\/span> <span class=\"token function\">currentConfig<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> config<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">onFrameDropped<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        droppedFrames<span class=\"token punctuation\">.<\/span><span class=\"token function\">increment<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token function\">droppedFrameCount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> droppedFrames<span class=\"token punctuation\">.<\/span><span class=\"token function\">sum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u4e0d\u662f\u201c\u6240\u6709\u5730\u65b9\u90fd\u4e0d\u7528\u9501\u201d&#xff0c;\u800c\u662f\u6309\u6570\u636e\u6027\u8d28\u9009\u62e9\u5de5\u5177&#xff1a;<\/p>\n<ul>\n<li>native \u751f\u547d\u5468\u671f\u4e32\u884c\u5316&#xff1b;<\/li>\n<li>\u914d\u7f6e\u7528\u4e0d\u53ef\u53d8\u5feb\u7167\u53d1\u5e03&#xff1b;<\/li>\n<li>\u72b6\u6001\u7528 Atomic&#xff1b;<\/li>\n<li>\u7edf\u8ba1\u7528 LongAdder\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>20. \u52a0\u9501\u65f6\u6700\u5bb9\u6613\u72af\u7684\u9519\u8bef<\/h3>\n<h4>20.1 \u9501\u5bf9\u8c61\u4e0d\u4e00\u81f4<\/h4>\n<p>\u9519\u8bef&#xff1a;<\/p>\n<p><span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    count<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6bcf\u6b21\u90fd\u662f\u65b0\u9501&#xff0c;\u7b49\u4e8e\u6ca1\u6709\u9501\u3002<\/p>\n<p>\u6b63\u786e&#xff1a;<\/p>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">Object<\/span> lock <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span>lock<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    count<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>20.2 \u53ea\u9501\u5199\u4e0d\u9501\u8bfb<\/h4>\n<p>\u9519\u8bef&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">update<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Config<\/span> config<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span>lock<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>config <span class=\"token operator\">&#061;<\/span> config<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Config<\/span> <span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> config<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5982\u679c\u8bfb\u5199\u90fd\u8981\u770b\u5230\u4e00\u81f4\u72b6\u6001&#xff0c;\u8981\u4e48\u8bfb\u4e5f\u52a0\u540c\u4e00\u628a\u9501&#xff0c;\u8981\u4e48\u4f7f\u7528 volatile \u53d1\u5e03\u4e0d\u53ef\u53d8\u5f15\u7528\u3002<\/p>\n<h4>20.3 \u9501\u5185\u8c03\u7528\u5916\u90e8\u56de\u8c03<\/h4>\n<p>\u9519\u8bef&#xff1a;<\/p>\n<p><span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span>lock<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    state <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">READY<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    listener<span class=\"token punctuation\">.<\/span><span class=\"token function\">onReady<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5916\u90e8\u56de\u8c03\u4e0d\u53ef\u63a7&#xff0c;\u53ef\u80fd\u53cd\u8fc7\u6765\u8c03\u7528\u5f53\u524d\u5bf9\u8c61&#xff0c;\u5bfc\u81f4\u6b7b\u9501\u6216\u590d\u6742\u91cd\u5165\u3002<\/p>\n<p>\u66f4\u7a33\u59a5&#xff1a;<\/p>\n<p><span class=\"token class-name\">Listener<\/span> callback<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span>lock<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    state <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">READY<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    callback <span class=\"token operator\">&#061;<\/span> listener<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\ncallback<span class=\"token punctuation\">.<\/span><span class=\"token function\">onReady<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>20.4 \u53cc\u91cd\u68c0\u67e5\u9501\u6ca1\u6709 volatile<\/h4>\n<p>\u9519\u8bef&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Singleton<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">Singleton<\/span> instance<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">Singleton<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>instance <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Singleton<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>instance <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    instance <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Singleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> instance<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6b63\u786e&#xff1a;<\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Singleton<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">volatile<\/span> <span class=\"token class-name\">Singleton<\/span> instance<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">Singleton<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>instance <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Singleton<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>instance <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    instance <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Singleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> instance<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u66f4\u7b80\u5355\u7684\u65b9\u5f0f\u662f\u4f7f\u7528\u9759\u6001\u5185\u90e8\u7c7b\u6216 enum\u3002<\/p>\n<h4>20.5 \u9501\u7c92\u5ea6\u8fc7\u5927<\/h4>\n<p>\u9519\u8bef&#xff1a;<\/p>\n<p><span class=\"token keyword\">synchronized<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">decodeLoop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>running<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">readPacket<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">decode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">render<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8fd9\u4f1a\u8ba9\u5176\u4ed6\u64cd\u4f5c\u957f\u65f6\u95f4\u65e0\u6cd5\u8fdb\u5165\u3002<\/p>\n<p>\u66f4\u597d\u7684\u601d\u8def\u662f\u53ea\u9501\u5171\u4eab\u72b6\u6001&#xff1a;<\/p>\n<p><span class=\"token keyword\">boolean<\/span> <span class=\"token function\">shouldRun<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span>lock<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> running<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u771f\u6b63\u8017\u65f6\u7684\u89e3\u7801\u3001\u6e32\u67d3\u4e0d\u8981\u968f\u4fbf\u653e\u5728\u5927\u9501\u91cc\u3002<\/p>\n<hr \/>\n<h3>21. \u5982\u4f55\u9009\u62e9\u5e76\u53d1\u5de5\u5177<\/h3>\n<p>\u53ef\u4ee5\u6309\u8fd9\u4e2a\u987a\u5e8f\u5224\u65ad&#xff1a;<\/p>\n<p>1. \u662f\u5426\u53ea\u662f\u7ebf\u7a0b\u95f4\u901a\u77e5\u4e00\u4e2a\u72b6\u6001&#xff1f;<br \/>\n   -&gt; volatile<\/p>\n<p>2. \u662f\u5426\u53ea\u662f\u7b80\u5355\u8ba1\u6570\u6216\u72b6\u6001\u5207\u6362&#xff1f;<br \/>\n   -&gt; AtomicInteger \/ AtomicReference<\/p>\n<p>3. \u662f\u5426\u662f\u9ad8\u5e76\u53d1\u7edf\u8ba1\u6307\u6807&#xff1f;<br \/>\n   -&gt; LongAdder<\/p>\n<p>4. \u662f\u5426\u8981\u4fdd\u62a4\u591a\u4e2a\u5b57\u6bb5\u6216\u8d44\u6e90\u751f\u547d\u5468\u671f&#xff1f;<br \/>\n   -&gt; synchronized \u6216 ReentrantLock<\/p>\n<p>5. \u662f\u5426\u8bfb\u591a\u5199\u5c11&#xff1f;<br \/>\n   -&gt; ReentrantReadWriteLock&#xff0c;\u5fc5\u8981\u65f6 StampedLock<\/p>\n<p>6. \u662f\u5426\u8d44\u6e90\u8981\u6c42\u987a\u5e8f\u6267\u884c\u6216\u7ebf\u7a0b\u4eb2\u548c&#xff1f;<br \/>\n   -&gt; \u5355\u7ebf\u7a0b Executor \/ HandlerThread<\/p>\n<p>7. \u662f\u5426\u53ea\u662f\u7b49\u5f85\u591a\u4e2a\u4efb\u52a1\u5b8c\u6210&#xff1f;<br \/>\n   -&gt; CountDownLatch \/ CompletableFuture&#xff0c;\u4e0d\u8981\u8bef\u7528\u6210\u9501<\/p>\n<p>\u518d\u7ed3\u5408\u5de5\u7a0b\u7ea6\u675f&#xff1a;<\/p>\n<table>\n<tr>\u7ea6\u675f\u66f4\u5408\u9002<\/tr>\n<tbody>\n<tr>\n<td>\u4ee3\u7801\u8981\u7b80\u5355\u53ef\u9760<\/td>\n<td>synchronized &#043; \u79c1\u6709\u9501\u5bf9\u8c61<\/td>\n<\/tr>\n<tr>\n<td>\u9700\u8981\u8d85\u65f6\u3001\u53d6\u6d88\u3001\u53ef\u4e2d\u65ad<\/td>\n<td>ReentrantLock<\/td>\n<\/tr>\n<tr>\n<td>\u8bfb\u8fdc\u591a\u4e8e\u5199<\/td>\n<td>ReadWriteLock<\/td>\n<\/tr>\n<tr>\n<td>\u8bfb\u6781\u591a\u4e14\u53ef\u63a5\u53d7\u91cd\u8bd5<\/td>\n<td>StampedLock<\/td>\n<\/tr>\n<tr>\n<td>\u7b80\u5355\u539f\u5b50\u53d8\u91cf<\/td>\n<td>Atomic*<\/td>\n<\/tr>\n<tr>\n<td>\u9ad8\u5e76\u53d1\u7edf\u8ba1<\/td>\n<td>LongAdder<\/td>\n<\/tr>\n<tr>\n<td>\u97f3\u89c6\u9891\u8d44\u6e90\u987a\u5e8f\u654f\u611f<\/td>\n<td>\u5355\u7ebf\u7a0b dispatcher<\/td>\n<\/tr>\n<tr>\n<td>\u751f\u547d\u5468\u671f\u72b6\u6001\u590d\u6742<\/td>\n<td>Atomic \u72b6\u6001\u673a &#043; \u8d44\u6e90\u9501<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h3>22. \u9762\u8bd5\u56de\u7b54\u6a21\u677f<\/h3>\n<h4>22.1 \u95ee&#xff1a;Java \u4e2d\u9501\u6709\u54ea\u4e9b\u533a\u522b&#xff1f;<\/h4>\n<p>\u53ef\u4ee5\u8fd9\u6837\u7b54&#xff1a;<\/p>\n<p>synchronized \u662f JVM \u5185\u7f6e\u76d1\u89c6\u5668\u9501&#xff0c;\u8bed\u6cd5\u7b80\u5355&#xff0c;\u81ea\u52a8\u91ca\u653e&#xff0c;\u9002\u5408\u77ed\u4e34\u754c\u533a\u3002<br \/>\nReentrantLock \u662f\u663e\u5f0f\u9501&#xff0c;\u652f\u6301 tryLock\u3001\u8d85\u65f6\u3001\u4e2d\u65ad\u3001\u516c\u5e73\u9501\u548c Condition&#xff0c;\u4f46\u5fc5\u987b finally unlock\u3002<br \/>\nReadWriteLock \u533a\u5206\u8bfb\u9501\u548c\u5199\u9501&#xff0c;\u9002\u5408\u8bfb\u591a\u5199\u5c11\u3002<br \/>\nStampedLock \u652f\u6301\u4e50\u89c2\u8bfb&#xff0c;\u6027\u80fd\u6f5c\u529b\u9ad8&#xff0c;\u4f46\u4e0d\u53ef\u91cd\u5165&#xff0c;\u4f7f\u7528\u590d\u6742\u3002<br \/>\nAtomic \u4e0d\u662f\u9501&#xff0c;\u57fa\u4e8e CAS \u505a\u7b80\u5355\u539f\u5b50\u66f4\u65b0\u3002<br \/>\nvolatile \u4e5f\u4e0d\u662f\u9501&#xff0c;\u4e3b\u8981\u4fdd\u8bc1\u53ef\u89c1\u6027\u548c\u6709\u5e8f\u6027&#xff0c;\u4e0d\u4fdd\u8bc1\u590d\u5408\u64cd\u4f5c\u539f\u5b50\u6027\u3002<\/p>\n<h4>22.2 \u95ee&#xff1a;volatile \u80fd\u4e0d\u80fd\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168&#xff1f;<\/h4>\n<p>\u53ef\u4ee5\u8fd9\u6837\u7b54&#xff1a;<\/p>\n<p>\u8981\u770b\u7ebf\u7a0b\u5b89\u5168\u6307\u4ec0\u4e48\u3002<br \/>\nvolatile \u80fd\u4fdd\u8bc1\u53d8\u91cf\u5199\u5165\u5bf9\u5176\u4ed6\u7ebf\u7a0b\u53ef\u89c1&#xff0c;\u5e76\u9650\u5236\u76f8\u5173\u91cd\u6392\u5e8f\u3002<br \/>\n\u5982\u679c\u53ea\u662f running \u8fd9\u79cd\u72b6\u6001\u6807\u8bb0&#xff0c;volatile \u901a\u5e38\u53ef\u4ee5\u3002<br \/>\n\u4f46\u5982\u679c\u662f count&#043;&#043;\u3001\u68c0\u67e5\u540e\u6267\u884c\u3001\u591a\u5b57\u6bb5\u4e00\u81f4\u6027&#xff0c;volatile \u4e0d\u591f&#xff0c;\u56e0\u4e3a\u5b83\u4e0d\u63d0\u4f9b\u4e92\u65a5&#xff0c;\u4e5f\u4e0d\u4fdd\u8bc1\u590d\u5408\u64cd\u4f5c\u539f\u5b50\u6027\u3002<\/p>\n<h4>22.3 \u95ee&#xff1a;count &#043; 1 \u662f\u4e0d\u662f\u539f\u5b50\u6027\u7684&#xff1f;<\/h4>\n<p>\u53ef\u4ee5\u8fd9\u6837\u7b54&#xff1a;<\/p>\n<p>\u4e0d\u662f\u3002\u5b83\u5305\u542b\u8bfb count\u3001\u8ba1\u7b97\u52a0\u4e00\u3001\u5199\u56de count \u4e09\u6b65\u3002<br \/>\n\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u6267\u884c\u4f1a\u51fa\u73b0\u66f4\u65b0\u4e22\u5931\u3002<br \/>\nvolatile int count \u4e5f\u4e0d\u80fd\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002<br \/>\n\u53ef\u4ee5\u7528 synchronized\u3001ReentrantLock\u3001AtomicInteger.incrementAndGet()&#xff0c;\u9ad8\u5e76\u53d1\u7edf\u8ba1\u53ef\u4ee5\u7528 LongAdder\u3002<\/p>\n<h4>22.4 \u95ee&#xff1a;\u97f3\u89c6\u9891\u521d\u59cb\u5316\u5171\u4eab\u8d44\u6e90\u600e\u4e48\u52a0\u9501&#xff1f;<\/h4>\n<p>\u53ef\u4ee5\u8fd9\u6837\u7b54&#xff1a;<\/p>\n<p>\u5982\u679c\u8d44\u6e90\u521d\u59cb\u5316\u5fc5\u987b\u4e92\u65a5&#xff0c;\u6700\u7b80\u5355\u662f synchronized \u6216\u79c1\u6709\u9501\u5bf9\u8c61\u3002<br \/>\n\u5982\u679c\u521d\u59cb\u5316\u53ef\u80fd\u5f88\u6162&#xff0c;\u8c03\u7528\u65b9\u9700\u8981\u8d85\u65f6\u6216\u53d6\u6d88&#xff0c;\u53ef\u4ee5\u7528 ReentrantLock.tryLock\u3002<br \/>\n\u5982\u679c\u914d\u7f6e\u8bfb\u591a\u5199\u5c11&#xff0c;\u53ef\u4ee5\u7528 ReadWriteLock \u6216\u4e0d\u53ef\u53d8\u914d\u7f6e\u52a0 volatile \u5f15\u7528\u3002<br \/>\n\u5982\u679c native \u8d44\u6e90\u6709\u7ebf\u7a0b\u4eb2\u548c\u6027&#xff0c;\u66f4\u63a8\u8350\u5355\u7ebf\u7a0b Executor \u6216 HandlerThread \u4e32\u884c\u5316\u8d44\u6e90\u8bbf\u95ee\u3002<br \/>\n\u5982\u679c\u751f\u547d\u5468\u671f\u72b6\u6001\u590d\u6742&#xff0c;\u53ef\u4ee5\u7528 AtomicReference \u505a\u72b6\u6001\u673a&#xff0c;\u518d\u7528\u9501\u4fdd\u62a4 native handle\u3002<\/p>\n<hr \/>\n<h3>23. \u6700\u7ec8\u603b\u7ed3<\/h3>\n<p>Java \u5e76\u53d1\u5de5\u5177\u4e0d\u662f\u4e92\u76f8\u66ff\u4ee3\u7684\u5173\u7cfb&#xff0c;\u800c\u662f\u5206\u522b\u89e3\u51b3\u4e0d\u540c\u5c42\u6b21\u7684\u95ee\u9898&#xff1a;<\/p>\n<ul>\n<li>volatile \u89e3\u51b3\u53ef\u89c1\u6027\u548c\u6709\u5e8f\u6027&#xff0c;\u4e0d\u89e3\u51b3\u590d\u5408\u64cd\u4f5c\u539f\u5b50\u6027&#xff1b;<\/li>\n<li>count &#061; count &#043; 1 \u4e0d\u662f\u539f\u5b50\u64cd\u4f5c&#xff0c;\u5373\u4f7f\u7528 volatile \u4fee\u9970\u4e5f\u4e0d\u662f&#xff1b;<\/li>\n<li>synchronized \u7b80\u5355\u53ef\u9760&#xff0c;\u9002\u5408\u77ed\u4e34\u754c\u533a&#xff1b;<\/li>\n<li>ReentrantLock \u66f4\u7075\u6d3b&#xff0c;\u9002\u5408\u8d85\u65f6\u3001\u53d6\u6d88\u3001\u590d\u6742\u7b49\u5f85&#xff1b;<\/li>\n<li>ReadWriteLock \u9002\u5408\u8bfb\u591a\u5199\u5c11&#xff1b;<\/li>\n<li>StampedLock \u9002\u5408\u66f4\u6781\u81f4\u7684\u4e50\u89c2\u8bfb\u6027\u80fd\u4f18\u5316&#xff1b;<\/li>\n<li>AtomicInteger \u9002\u5408\u7b80\u5355\u539f\u5b50\u66f4\u65b0&#xff1b;<\/li>\n<li>LongAdder \u9002\u5408\u9ad8\u5e76\u53d1\u7edf\u8ba1&#xff1b;<\/li>\n<li>CountDownLatch \u662f\u7ebf\u7a0b\u534f\u8c03\u5de5\u5177&#xff0c;\u4e0d\u662f\u4fdd\u62a4\u5171\u4eab\u8d44\u6e90\u7684\u9501&#xff1b;<\/li>\n<li>\u97f3\u89c6\u9891\u8d44\u6e90\u5e38\u5e38\u66f4\u9002\u5408\u5355\u7ebf\u7a0b\u4e32\u884c\u5316&#xff0c;\u56e0\u4e3a\u5b83\u4eec\u6709\u751f\u547d\u5468\u671f\u987a\u5e8f\u548c native \u8d44\u6e90\u7ea6\u675f\u3002<\/li>\n<\/ul>\n<p>\u6700\u5b9e\u7528\u7684\u5224\u65ad\u65b9\u5f0f\u662f&#xff1a;<\/p>\n<p>\u5148\u5224\u65ad\u4f60\u8981\u4fdd\u62a4\u7684\u662f\u4e00\u4e2a\u53d8\u91cf\u3001\u4e00\u4e2a\u72b6\u6001\u3001\u4e00\u7ec4\u5b57\u6bb5&#xff0c;\u8fd8\u662f\u4e00\u4e2a\u771f\u5b9e\u8d44\u6e90&#xff1b;\u518d\u51b3\u5b9a\u7528 volatile\u3001Atomic\u3001\u9501\u3001\u8bfb\u5199\u9501&#xff0c;\u8fd8\u662f\u5355\u7ebf\u7a0b\u961f\u5217\u3002<\/p>\n<p>\u8bb0\u4f4f\u8fd9\u53e5\u8bdd&#xff0c;\u5f88\u591a\u5e76\u53d1\u9898\u90fd\u4f1a\u6e05\u6670\u5f88\u591a&#xff1a;\u53ef\u89c1\u6027\u4e0d\u7b49\u4e8e\u539f\u5b50\u6027&#xff0c;\u539f\u5b50\u53d8\u91cf\u4e0d\u7b49\u4e8e\u8d44\u6e90\u4e92\u65a5&#xff0c;\u52a0\u9501\u4e5f\u4e0d\u7b49\u4e8e\u8bbe\u8ba1\u5408\u7406\u3002<\/p>\n<hr \/>\n<h3>\u53c2\u8003\u8d44\u6599<\/h3>\n<ul>\n<li>Java Language Specification: Threads and Locks<\/li>\n<li>Oracle Java API: ReentrantLock<\/li>\n<li>Oracle Java API: ReentrantReadWriteLock<\/li>\n<li>Oracle Java API: StampedLock<\/li>\n<li>Oracle Java API: AtomicInteger<\/li>\n<li>Oracle Java API: LongAdder<\/li>\n<li>Oracle Java API: CountDownLatch<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Java \u5e76\u53d1\u91cc\u6700\u5bb9\u6613\u6df7\u6dc6\u7684\u51e0\u4e2a\u8bcd\u662f&#xff1a;\u9501\u3001\u539f\u5b50\u6027\u3001\u53ef\u89c1\u6027\u3001\u6709\u5e8f\u6027\u3001\u7ebf\u7a0b\u5b89\u5168\u3002\u5f88\u591a\u95ee\u9898\u8868\u9762\u4e0a\u90fd\u50cf\u201c\u52a0\u4e2a\u9501\u5c31\u884c\u201d&#xff0c;\u4f46\u80cc\u540e\u7684\u95ee\u9898\u53ef\u80fd\u5b8c\u5168\u4e0d\u540c&#xff1a;<br \/>\n\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u6539\u4e00\u4e2a\u53d8\u91cf&#xff0c;\u7ed3\u679c\u4e22\u5931&#xff0c;\u8fd9\u662f\u539f\u5b50\u6027\u95ee\u9898&#xff1b;\u4e00\u4e2a\u7ebf\u7a0b\u6539\u4e86\u53d8\u91cf&#xff0c;\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u770b\u4e0d\u5230&#xff0c;\u8fd9\u662f\u53ef\u89c1\u6027\u95ee\u9898&#xff1b;\u4ee3\u7801\u987a\u5e8f\u770b\u8d77\u6765\u6ca1\u95ee\u9898&#xff0c;\u8fd0\u884c\u65f6\u56e0\u4e3a\u91cd\u6392\u5e8f\u51fa\u73b0\u5f02\u5e38&#xff0c;\u8fd9\u662f\u6709\u5e8f\u6027\u95ee\u9898&#xff1b;\u591a\u4e2a\u7ebf<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,190],"topic":[],"class_list":["post-102132","post","type-post","status-publish","format-standard","hentry","category-server","tag-java","tag-190"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - 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