{"id":56003,"date":"2025-08-14T11:24:31","date_gmt":"2025-08-14T03:24:31","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/56003.html"},"modified":"2025-08-14T11:24:31","modified_gmt":"2025-08-14T03:24:31","slug":"%e6%ad%bb%e9%94%81%e9%97%ae%e9%a2%98%e9%9d%a2%e8%af%95%e5%85%a8%e6%94%bb%e7%95%a5","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/56003.html","title":{"rendered":"\u6b7b\u9501\u95ee\u9898\u9762\u8bd5\u5168\u653b\u7565"},"content":{"rendered":"<h2>&#x1f480; \u6b7b\u9501\u95ee\u9898\u9762\u8bd5\u5168\u653b\u7565 &#8211; \u4ece\u539f\u7406\u5230\u5b9e\u6218\u7684\u5b8c\u6574\u6307\u5357<\/h2>\n<h3>&#x1f3af; \u524d\u8a00&#xff1a;\u4e3a\u4ec0\u4e48\u6b7b\u9501\u662f\u9762\u8bd5\u5fc5\u8003\u9898&#xff1f;<\/h3>\n<p>\u5728\u6240\u6709\u64cd\u4f5c\u7cfb\u7edf\u6982\u5ff5\u4e2d&#xff0c;\u6b7b\u9501\u53ef\u80fd\u662f\u6700\u5bb9\u6613\u7406\u89e3\u4f46\u4e5f\u6700\u5bb9\u6613\u51fa\u9519\u7684\u6982\u5ff5\u3002\u51e0\u4e4e\u6bcf\u4e2a\u6280\u672f\u9762\u8bd5\u90fd\u4f1a\u6d89\u53ca\u6b7b\u9501\u95ee\u9898&#xff0c;\u56e0\u4e3a\u5b83\u4e0d\u4ec5\u8003\u67e5\u4f60\u5bf9\u5e76\u53d1\u7f16\u7a0b\u7684\u7406\u89e3&#xff0c;\u66f4\u80fd\u53cd\u6620\u4f60\u89e3\u51b3\u590d\u6742\u95ee\u9898\u7684\u601d\u7ef4\u80fd\u529b\u3002<\/p>\n<p>\u638c\u63e1\u6b7b\u9501&#xff0c;\u4f60\u5c06\u80fd\u591f&#xff1a;<\/p>\n<ul>\n<li>\u2705 \u5199\u51fa\u66f4\u5b89\u5168\u7684\u591a\u7ebf\u7a0b\u4ee3\u7801<\/li>\n<li>\u2705 \u5feb\u901f\u8bca\u65ad\u548c\u89e3\u51b3\u7cfb\u7edf\u5361\u6b7b\u95ee\u9898<\/li>\n<li>\u2705 \u5728\u9762\u8bd5\u4e2d\u5c55\u73b0\u624e\u5b9e\u7684\u8ba1\u7b97\u673a\u57fa\u7840<\/li>\n<li>\u2705 \u8bbe\u8ba1\u51fa\u66f4\u5065\u58ee\u7684\u5206\u5e03\u5f0f\u7cfb\u7edf<\/li>\n<\/ul>\n<h3>&#x1f50d; \u4ec0\u4e48\u662f\u6b7b\u9501&#xff1f;<\/h3>\n<h4>\u7ecf\u5178\u5b9a\u4e49<\/h4>\n<p>\u6b7b\u9501&#xff08;Deadlock&#xff09;&#xff1a;\u4e24\u4e2a\u6216\u591a\u4e2a\u8fdb\u7a0b\u5728\u6267\u884c\u8fc7\u7a0b\u4e2d&#xff0c;\u56e0\u4e89\u593a\u8d44\u6e90\u800c\u9020\u6210\u7684\u4e00\u79cd\u4e92\u76f8\u7b49\u5f85\u7684\u73b0\u8c61&#xff0c;\u82e5\u65e0\u5916\u529b\u5e72\u6d89&#xff0c;\u5b83\u4eec\u90fd\u5c06\u65e0\u6cd5\u63a8\u8fdb\u4e0b\u53bb\u3002<\/p>\n<h4>\u751f\u6d3b\u4e2d\u7684\u6b7b\u9501\u4f8b\u5b50<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250814032429-689d56edd5443.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" 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alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>\u8be6\u7ec6\u89e3\u6790\u6bcf\u4e2a\u6761\u4ef6<\/h4>\n<h5>1. &#x1f512; \u4e92\u65a5\u6761\u4ef6&#xff08;Mutual Exclusion&#xff09;<\/h5>\n<p>\u542b\u4e49&#xff1a;\u8d44\u6e90\u5728\u540c\u4e00\u65f6\u95f4\u53ea\u80fd\u88ab\u4e00\u4e2a\u8fdb\u7a0b\u4f7f\u7528<\/p>\n<p>\u5b9e\u9645\u4f8b\u5b50&#xff1a;<\/p>\n<p>\u2705 \u4e92\u65a5\u8d44\u6e90&#xff1a;<br \/>\n&#8211; \u6253\u5370\u673a&#xff1a;\u4e0d\u80fd\u540c\u65f6\u6253\u5370\u4e24\u4e2a\u6587\u6863<br \/>\n&#8211; \u6587\u4ef6\u5199\u9501&#xff1a;\u4e0d\u80fd\u540c\u65f6\u5199\u5165\u540c\u4e00\u6587\u4ef6<br \/>\n&#8211; \u6570\u636e\u5e93\u884c\u9501&#xff1a;\u4e0d\u80fd\u540c\u65f6\u4fee\u6539\u540c\u4e00\u884c\u6570\u636e<br \/>\n&#8211; \u7f51\u7edc\u7aef\u53e3&#xff1a;\u540c\u4e00\u7aef\u53e3\u4e0d\u80fd\u88ab\u591a\u4e2a\u7a0b\u5e8f\u7ed1\u5b9a<\/p>\n<p>\u274c \u975e\u4e92\u65a5\u8d44\u6e90&#xff1a;<br \/>\n&#8211; CPU\u65f6\u95f4&#xff1a;\u53ef\u4ee5\u901a\u8fc7\u65f6\u95f4\u7247\u5171\u4eab<br \/>\n&#8211; \u5185\u5b58&#xff1a;\u53ef\u4ee5\u540c\u65f6\u88ab\u591a\u4e2a\u8fdb\u7a0b\u4f7f\u7528\u4e0d\u540c\u533a\u57df<br \/>\n&#8211; \u53ea\u8bfb\u6587\u4ef6&#xff1a;\u53ef\u4ee5\u88ab\u591a\u4e2a\u8fdb\u7a0b\u540c\u65f6\u8bfb\u53d6<\/p>\n<h5>2. &#x1f932; \u5360\u6709\u548c\u7b49\u5f85\u6761\u4ef6&#xff08;Hold and Wait&#xff09;<\/h5>\n<p>\u542b\u4e49&#xff1a;\u8fdb\u7a0b\u81f3\u5c11\u5360\u6709\u4e00\u4e2a\u8d44\u6e90&#xff0c;\u540c\u65f6\u53c8\u5728\u7b49\u5f85\u83b7\u53d6\u5176\u4ed6\u8d44\u6e90<\/p>\n<p>\u4ee3\u7801\u793a\u4f8b\u573a\u666f&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u7ebf\u7a0b1<\/span><br \/>\n<span class=\"token keyword\">synchronized<\/span><span class=\"token punctuation\">(<\/span>lockA<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>        <span class=\"token comment\">\/\/ \u5360\u6709\u8d44\u6e90A<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u505a\u4e00\u4e9b\u5de5\u4f5c&#8230;<\/span><br \/>\n    <span class=\"token keyword\">synchronized<\/span><span class=\"token punctuation\">(<\/span>lockB<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>    <span class=\"token comment\">\/\/ \u7b49\u5f85\u8d44\u6e90B<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u4f7f\u7528A\u548cB<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7ebf\u7a0b2  <\/span><br \/>\n<span class=\"token keyword\">synchronized<\/span><span class=\"token punctuation\">(<\/span>lockB<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>        <span class=\"token comment\">\/\/ \u5360\u6709\u8d44\u6e90B<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u505a\u4e00\u4e9b\u5de5\u4f5c&#8230;<\/span><br \/>\n    <span class=\"token keyword\">synchronized<\/span><span class=\"token punctuation\">(<\/span>lockA<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>    <span class=\"token comment\">\/\/ \u7b49\u5f85\u8d44\u6e90A<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u4f7f\u7528B\u548cA<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>3. &#x1f6ab; \u4e0d\u53ef\u5265\u593a\u6761\u4ef6&#xff08;No Preemption&#xff09;<\/h5>\n<p>\u542b\u4e49&#xff1a;\u8d44\u6e90\u4e0d\u80fd\u88ab\u5f3a\u5236\u6027\u5730\u4ece\u8fdb\u7a0b\u4e2d\u5265\u593a&#xff0c;\u53ea\u80fd\u7531\u5360\u6709\u5b83\u7684\u8fdb\u7a0b\u4e3b\u52a8\u91ca\u653e<\/p>\n<p>\u5bf9\u6bd4\u5206\u6790&#xff1a;<\/p>\n<p>\u53ef\u5265\u593a\u8d44\u6e90&#xff1a;<br \/>\n\u2705 CPU\u65f6\u95f4\u7247&#xff1a;\u64cd\u4f5c\u7cfb\u7edf\u53ef\u4ee5\u5f3a\u5236\u5207\u6362<br \/>\n\u2705 \u5185\u5b58\u9875&#xff1a;\u53ef\u4ee5\u88ab\u4ea4\u6362\u5230\u78c1\u76d8<br \/>\n\u2705 \u7f51\u7edc\u5e26\u5bbd&#xff1a;\u53ef\u4ee5\u88ab\u91cd\u65b0\u5206\u914d<\/p>\n<p>\u4e0d\u53ef\u5265\u593a\u8d44\u6e90&#xff1a;<br \/>\n\u274c \u6587\u4ef6\u9501&#xff1a;\u5fc5\u987b\u7b49\u5f85\u6301\u6709\u8005\u91ca\u653e<br \/>\n\u274c \u4fe1\u53f7\u91cf&#xff1a;\u4e0d\u80fd\u5f3a\u5236\u91ca\u653e<br \/>\n\u274c \u4e92\u65a5\u9501&#xff1a;\u5fc5\u987b\u7531\u83b7\u5f97\u8005\u91ca\u653e<br \/>\n\u274c \u6570\u636e\u5e93\u8fde\u63a5&#xff1a;\u4e0d\u80fd\u5f3a\u5236\u65ad\u5f00\u6b63\u5728\u4f7f\u7528\u7684\u8fde\u63a5<\/p>\n<h5>4. &#x1f504; \u5faa\u73af\u7b49\u5f85\u6761\u4ef6&#xff08;Circular Wait&#xff09;<\/h5>\n<p>\u542b\u4e49&#xff1a;\u5b58\u5728\u4e00\u4e2a\u8fdb\u7a0b\u8d44\u6e90\u7684\u5faa\u73af\u7b49\u5f85\u94fe<\/p>\n<p>\u7b49\u5f85\u94fe\u793a\u4f8b&#xff1a;<\/p>\n<p>#mermaid-svg-w9Md870lKBTLQbGW {font-family:\\&#8221;trebuchet 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div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-XYws95RgjRhaOM4s :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<span id=\"L-L-A-B\" class=\"edgeLabel L-LS-A&#039; L-LE-B\"><\/span><span id=\"L-L-A-C\" class=\"edgeLabel L-LS-A&#039; L-LE-C\"><\/span><span id=\"L-L-D-E\" class=\"edgeLabel L-LS-D&#039; L-LE-E\"><\/span><span id=\"L-L-D-F\" class=\"edgeLabel L-LS-D&#039; L-LE-F\"><\/span><span id=\"L-L-G-H\" class=\"edgeLabel L-LS-G&#039; L-LE-H\"><\/span><span id=\"L-L-G-I\" class=\"edgeLabel L-LS-G&#039; L-LE-I\"><\/span><span id=\"L-L-J-K\" class=\"edgeLabel L-LS-J&#039; L-LE-K\"><\/span><span id=\"L-L-J-L\" class=\"edgeLabel L-LS-J&#039; L-LE-L\"><\/span><span id=\"L-L-M-N\" class=\"edgeLabel 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L-LE-O\"><\/span>\u54f2\u5b66\u5bb61\u5de6\u624b\u53c9\u5b501\u53f3\u624b\u53c9\u5b502\u54f2\u5b66\u5bb62\u5de6\u624b\u53c9\u5b502\u53f3\u624b\u53c9\u5b503\u54f2\u5b66\u5bb63\u5de6\u624b\u53c9\u5b503\u53f3\u624b\u53c9\u5b504\u54f2\u5b66\u5bb64\u5de6\u624b\u53c9\u5b504\u53f3\u624b\u53c9\u5b505\u54f2\u5b66\u5bb65\u5de6\u624b\u53c9\u5b505\u53f3\u624b\u53c9\u5b501<\/p>\n<p>\u95ee\u9898\u63cf\u8ff0&#xff1a;<\/p>\n<ul>\n<li>5\u4e2a\u54f2\u5b66\u5bb6\u56f4\u5750\u5706\u684c&#xff0c;\u6bcf\u4eba\u9762\u524d\u4e00\u4e2a\u76d8\u5b50<\/li>\n<li>\u76f8\u90bb\u4e24\u4eba\u4e4b\u95f4\u6709\u4e00\u652f\u53c9\u5b50&#xff0c;\u51715\u652f<\/li>\n<li>\u6bcf\u4e2a\u54f2\u5b66\u5bb6\u9700\u8981\u540c\u65f6\u62ff\u5230\u5de6\u53f3\u4e24\u652f\u53c9\u5b50\u624d\u80fd\u5403\u996d<\/li>\n<li>\u5982\u679c\u6bcf\u4e2a\u4eba\u90fd\u5148\u62ff\u5de6\u624b\u53c9\u5b50&#xff0c;\u518d\u62ff\u53f3\u624b\u53c9\u5b50&#xff0c;\u5c31\u4f1a\u6b7b\u9501<\/li>\n<\/ul>\n<p>\u6b7b\u9501\u5206\u6790&#xff1a;<\/p>\n<p>\u65f6\u523bT1&#xff1a;\u6240\u6709\u54f2\u5b66\u5bb6\u540c\u65f6\u62ff\u8d77\u5de6\u624b\u53c9\u5b50<br 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span{color:#333;}#mermaid-svg-MHBMzBsagbvQso5N div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-MHBMzBsagbvQso5N :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}\u8d44\u6e90\u8fdb\u7a0b<span id=\"L-L-R1-P1\" class=\"edgeLabel L-LS-R1&#039; L-LE-P1\"><\/span><span id=\"L-L-P1-R2\" class=\"edgeLabel L-LS-P1&#039; L-LE-R2\"><\/span><span id=\"L-L-R2-P2\" class=\"edgeLabel L-LS-R2&#039; L-LE-P2\"><\/span><span id=\"L-L-P2-R3\" class=\"edgeLabel L-LS-P2&#039; L-LE-R3\"><\/span><span id=\"L-L-R3-P3\" class=\"edgeLabel L-LS-R3&#039; L-LE-P3\"><\/span><span id=\"L-L-P3-R1\" class=\"edgeLabel L-LS-P3&#039; L-LE-R1\"><\/span>\u8d44\u6e90R1\u8d44\u6e90R2\u8d44\u6e90R3\u8fdb\u7a0bP1\u8fdb\u7a0bP2\u8fdb\u7a0bP3<\/p>\n<p>\u56fe\u7684\u542b\u4e49&#xff1a;<\/p>\n<ul>\n<li>\u5b9e\u7ebf\u7bad\u5934&#xff1a;\u8d44\u6e90\u5206\u914d\u5173\u7cfb&#xff08;\u8d44\u6e90 \u2192 \u8fdb\u7a0b&#xff09;<\/li>\n<li>\u865a\u7ebf\u7bad\u5934&#xff1a;\u8d44\u6e90\u8bf7\u6c42\u5173\u7cfb&#xff08;\u8fdb\u7a0b \u2192 \u8d44\u6e90&#xff09;<\/li>\n<li>\u5b58\u5728\u73af\u8def&#xff1a;P1 \u2192 R2 \u2192 P2 \u2192 R3 \u2192 P3 \u2192 R1 \u2192 P1&#xff0c;\u8868\u793a\u6b7b\u9501<\/li>\n<\/ul>\n<h4>\u7b49\u5f85\u56fe\u68c0\u6d4b\u7b97\u6cd5<\/h4>\n<p>\u7b97\u6cd5\u6b65\u9aa4&#xff1a;<\/p>\n<p>1. \u6784\u5efa\u7b49\u5f85\u56fe&#xff1a;<br \/>\n   &#8211; \u8282\u70b9\u4ee3\u8868\u8fdb\u7a0b<br \/>\n   &#8211; \u8fb9\u4ee3\u8868\u7b49\u5f85\u5173\u7cfb&#xff08;P1\u7b49\u5f85P2\u6301\u6709\u7684\u8d44\u6e90&#xff09;<\/p>\n<p>2. \u6df1\u5ea6\u4f18\u5148\u641c\u7d22\u68c0\u6d4b\u73af&#xff1a;<br \/>\n   def has_cycle(graph):<br \/>\n     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\u8d44\u6e90\u6c60\u5316&#xff1a;\u4f7f\u7528\u8fde\u63a5\u6c60\u4ee3\u66ff\u72ec\u5360\u8fde\u63a5<\/p>\n<p>\u274c \u4e0d\u53ef\u884c\u7684\u573a\u666f&#xff1a;<br \/>\n&#8211; \u6253\u5370\u673a&#xff1a;\u7269\u7406\u4e0a\u65e0\u6cd5\u540c\u65f6\u4f7f\u7528<br \/>\n&#8211; \u6587\u4ef6\u5199\u64cd\u4f5c&#xff1a;\u6570\u636e\u4e00\u81f4\u6027\u8981\u6c42\u72ec\u5360<br \/>\n&#8211; \u786c\u4ef6\u8bbe\u5907&#xff1a;\u7269\u7406\u9650\u5236\u65e0\u6cd5\u5171\u4eab<\/p>\n<h4>2. \u7834\u574f\u5360\u6709\u548c\u7b49\u5f85\u6761\u4ef6<\/h4>\n<p>\u7b56\u7565&#xff1a;\u8981\u6c42\u8fdb\u7a0b\u4e00\u6b21\u6027\u7533\u8bf7\u6240\u6709\u9700\u8981\u7684\u8d44\u6e90<\/p>\n<p><span class=\"token comment\">\/\/ \u6539\u8fdb\u524d&#xff1a;\u53ef\u80fd\u6b7b\u9501\u7684\u4ee3\u7801<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">badTransfer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Account<\/span> from<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Account<\/span> <span class=\"token keyword\">to<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> amount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">synchronized<\/span><span class=\"token punctuation\">(<\/span>from<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>        <span class=\"token comment\">\/\/ \u5148\u5360\u6709from<\/span><br \/>\n        <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ \u6a21\u62df\u4e00\u4e9b\u5904\u7406<\/span><br \/>\n        <span class=\"token keyword\">synchronized<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">to<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>      <span class=\"token comment\">\/\/ \u518d\u7533\u8bf7to&#xff0c;\u53ef\u80fd\u6b7b\u9501<\/span><br \/>\n            from<span class=\"token punctuation\">.<\/span><span class=\"token function\">withdraw<\/span><span class=\"token punctuation\">(<\/span>amount<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">to<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">deposit<\/span><span class=\"token punctuation\">(<\/span>amount<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 comment\">\/\/ \u6539\u8fdb\u540e&#xff1a;\u4e00\u6b21\u6027\u83b7\u53d6\u6240\u6709\u8d44\u6e90<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">goodTransfer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Account<\/span> from<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Account<\/span> <span class=\"token keyword\">to<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> amount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5b9a\u4e49\u83b7\u53d6\u591a\u4e2a\u9501\u7684\u987a\u5e8f&#xff0c;\u907f\u514d\u6b7b\u9501<\/span><br \/>\n    <span class=\"token class-name\">Account<\/span> firstLock <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">identityHashCode<\/span><span class=\"token punctuation\">(<\/span>from<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">identityHashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">to<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">?<\/span> from <span class=\"token operator\">:<\/span> <span class=\"token keyword\">to<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">Account<\/span> secondLock <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">identityHashCode<\/span><span class=\"token punctuation\">(<\/span>from<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">identityHashCode<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">to<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">?<\/span> <span class=\"token keyword\">to<\/span> <span class=\"token operator\">:<\/span> from<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">synchronized<\/span><span class=\"token punctuation\">(<\/span>firstLock<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">synchronized<\/span><span class=\"token punctuation\">(<\/span>secondLock<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            from<span class=\"token punctuation\">.<\/span><span class=\"token function\">withdraw<\/span><span class=\"token punctuation\">(<\/span>amount<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">to<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">deposit<\/span><span class=\"token punctuation\">(<\/span>amount<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\u7f3a\u70b9\u5206\u6790&#xff1a;<\/p>\n<p>\u2705 \u4f18\u70b9&#xff1a;<br \/>\n&#8211; \u5f7b\u5e95\u907f\u514d\u6b7b\u9501<br \/>\n&#8211; \u903b\u8f91\u7b80\u5355\u6e05\u6670<\/p>\n<p>\u274c \u7f3a\u70b9&#xff1a;<br \/>\n&#8211; \u8d44\u6e90\u5229\u7528\u7387\u4f4e&#xff08;\u63d0\u524d\u5360\u7528\u6682\u4e0d\u9700\u8981\u7684\u8d44\u6e90&#xff09;<br \/>\n&#8211; \u53ef\u80fd\u5bfc\u81f4\u9965\u997f&#xff08;\u67d0\u4e9b\u8fdb\u7a0b\u603b\u662f\u7533\u8bf7\u4e0d\u5230\u5168\u90e8\u8d44\u6e90&#xff09;<br \/>\n&#8211; \u96be\u4ee5\u9884\u77e5\u8fdb\u7a0b\u9700\u8981\u7684\u5168\u90e8\u8d44\u6e90<\/p>\n<h4>3. \u7834\u574f\u4e0d\u53ef\u5265\u593a\u6761\u4ef6<\/h4>\n<p>\u7b56\u7565&#xff1a;\u5141\u8bb8\u7cfb\u7edf\u5f3a\u5236\u56de\u6536\u8d44\u6e90<\/p>\n<p><span class=\"token comment\">\/\/ \u4f7f\u7528tryLock\u5b9e\u73b0\u53ef\u5265\u593a\u7684\u9501<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">tryTransfer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Account<\/span> from<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Account<\/span> <span class=\"token keyword\">to<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> amount<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">long<\/span> timeout<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>from<span class=\"token punctuation\">.<\/span>lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">tryLock<\/span><span class=\"token punctuation\">(<\/span>timeout<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">TimeUnit<\/span><span class=\"token punctuation\">.<\/span>MILLISECONDS<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 keyword\">to<\/span><span class=\"token punctuation\">.<\/span>lock<span class=\"token punctuation\">.<\/span><span class=\"token function\">tryLock<\/span><span class=\"token punctuation\">(<\/span>timeout<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">TimeUnit<\/span><span class=\"token punctuation\">.<\/span>MILLISECONDS<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                    from<span class=\"token punctuation\">.<\/span><span class=\"token function\">withdraw<\/span><span class=\"token punctuation\">(<\/span>amount<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">to<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">deposit<\/span><span class=\"token punctuation\">(<\/span>amount<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\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token keyword\">to<\/span><span class=\"token punctuation\">.<\/span>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> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            from<span class=\"token punctuation\">.<\/span>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 keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8d85\u65f6\u5931\u8d25&#xff0c;\u907f\u514d\u6b7b\u9501<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>4. \u7834\u574f\u5faa\u73af\u7b49\u5f85\u6761\u4ef6<\/h4>\n<p>\u7b56\u7565&#xff1a;\u5bf9\u6240\u6709\u8d44\u6e90\u8fdb\u884c\u6392\u5e8f&#xff0c;\u8981\u6c42\u8fdb\u7a0b\u6309\u987a\u5e8f\u7533\u8bf7\u8d44\u6e90<\/p>\n<p><span class=\"token comment\">\/\/ \u94f6\u884c\u8f6c\u8d26\u7684\u6b63\u786e\u5b9e\u73b0&#xff1a;\u6309\u8d26\u6237ID\u6392\u5e8f\u83b7\u53d6\u9501<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">orderedTransfer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Account<\/span> from<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Account<\/span> <span class=\"token keyword\">to<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> amount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">Account<\/span> firstAccount <span class=\"token operator\">&#061;<\/span> from<span class=\"token punctuation\">.<\/span><span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token keyword\">to<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">?<\/span> from <span class=\"token operator\">:<\/span> <span class=\"token keyword\">to<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">Account<\/span> secondAccount <span class=\"token operator\">&#061;<\/span> from<span class=\"token punctuation\">.<\/span><span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token keyword\">to<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">?<\/span> <span class=\"token keyword\">to<\/span> <span class=\"token operator\">:<\/span> from<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">synchronized<\/span><span class=\"token punctuation\">(<\/span>firstAccount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">synchronized<\/span><span class=\"token punctuation\">(<\/span>secondAccount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>from <span class=\"token operator\">&#061;&#061;<\/span> firstAccount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                from<span class=\"token punctuation\">.<\/span><span class=\"token function\">withdraw<\/span><span class=\"token punctuation\">(<\/span>amount<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">to<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">deposit<\/span><span class=\"token punctuation\">(<\/span>amount<span class=\"token punctuation\">)<\/span><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                from<span class=\"token punctuation\">.<\/span><span class=\"token function\">withdraw<\/span><span class=\"token punctuation\">(<\/span>amount<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">to<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">deposit<\/span><span class=\"token punctuation\">(<\/span>amount<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 punctuation\">}<\/span><\/p>\n<p>\u6392\u5e8f\u7b56\u7565\u5bf9\u6bd4&#xff1a;<\/p>\n<table>\n<tr>\u6392\u5e8f\u4f9d\u636e\u4f18\u70b9\u7f3a\u70b9\u9002\u7528\u573a\u666f<\/tr>\n<tbody>\n<tr>\n<td>\u5bf9\u8c61ID<\/td>\n<td>\u7b80\u5355\u53ef\u9760<\/td>\n<td>\u9700\u8981\u5168\u5c40\u552f\u4e00ID<\/td>\n<td>\u6570\u636e\u5e93\u4e8b\u52a1<\/td>\n<\/tr>\n<tr>\n<td>\u5185\u5b58\u5730\u5740<\/td>\n<td>\u65e0\u9700\u989d\u5916ID<\/td>\n<td>\u5730\u5740\u53ef\u80fd\u53d8\u5316<\/td>\n<td>\u7b80\u5355\u5e94\u7528<\/td>\n<\/tr>\n<tr>\n<td>\u54c8\u5e0c\u503c<\/td>\n<td>\u5206\u5e03\u5747\u5300<\/td>\n<td>\u53ef\u80fd\u51b2\u7a81<\/td>\n<td>\u5927\u89c4\u6a21\u7cfb\u7edf<\/td>\n<\/tr>\n<tr>\n<td>\u4e1a\u52a1\u903b\u8f91<\/td>\n<td>\u7b26\u5408\u76f4\u89c9<\/td>\n<td>\u590d\u6742\u6027\u9ad8<\/td>\n<td>\u7279\u5b9a\u4e1a\u52a1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>&#x1f3e5; \u6b7b\u9501\u907f\u514d&#xff1a;\u94f6\u884c\u5bb6\u7b97\u6cd5<\/h3>\n<h4>\u7b97\u6cd5\u6838\u5fc3\u601d\u60f3<\/h4>\n<p>\u94f6\u884c\u5bb6\u7b97\u6cd5\u901a\u8fc7\u9884\u5148\u68c0\u67e5\u8d44\u6e90\u5206\u914d\u7684\u5b89\u5168\u6027\u6765\u907f\u514d\u6b7b\u9501&#xff0c;\u786e\u4fdd\u7cfb\u7edf\u59cb\u7ec8\u5904\u4e8e\u5b89\u5168\u72b6\u6001\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250814032430-689d56ee33a3f.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>\u7b97\u6cd5\u5b9e\u73b0\u793a\u4f8b<\/h4>\n<p>\u573a\u666f\u8bbe\u7f6e&#xff1a;<\/p>\n<ul>\n<li>3\u4e2a\u8fdb\u7a0b&#xff1a;P0, P1, P2<\/li>\n<li>3\u79cd\u8d44\u6e90&#xff1a;A(10\u4e2a), B(5\u4e2a), C(7\u4e2a)<\/li>\n<\/ul>\n<p>\u5f53\u524d\u8d44\u6e90\u5206\u914d\u77e9\u9635 Allocation&#xff1a;<br \/>\n     A  B  C<br \/>\nP0   0  1  0<br \/>\nP1   2  0  0<br \/>\nP2   3  0  2<\/p>\n<p>\u6700\u5927\u9700\u6c42\u77e9\u9635 Max&#xff1a;<br \/>\n     A  B  C<br \/>\nP0   7  5  3<br \/>\nP1   3  2  2<br \/>\nP2   9  0  2<\/p>\n<p>\u8fd8\u9700\u8d44\u6e90\u77e9\u9635 Need &#061; Max &#8211; Allocation&#xff1a;<br \/>\n     A  B  C<br \/>\nP0   7  4  3<br \/>\nP1   1  2  2<br \/>\nP2   6  0  0<\/p>\n<p>\u5f53\u524d\u53ef\u7528\u8d44\u6e90 Available&#xff1a;<br \/>\nA: 10-0-2-3 &#061; 5<br \/>\nB: 5-1-0-0 &#061; 4<br \/>\nC: 7-0-0-2 &#061; 5<br \/>\nAvailable &#061; [5, 4, 5]<\/p>\n<p>\u5b89\u5168\u6027\u68c0\u67e5\u7b97\u6cd5&#xff1a;<\/p>\n<p><span class=\"token keyword\">def<\/span> <span class=\"token function\">is_safe_state<\/span><span class=\"token punctuation\">(<\/span>allocation<span class=\"token punctuation\">,<\/span> max_need<span class=\"token punctuation\">,<\/span> available<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    n_processes <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>allocation<span class=\"token punctuation\">)<\/span><br \/>\n    n_resources <span class=\"token operator\">&#061;<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>available<span class=\"token punctuation\">)<\/span><\/p>\n<p>    <span class=\"token comment\"># \u8ba1\u7b97Need\u77e9\u9635<\/span><br \/>\n    need <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">[<\/span>max_need<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#8211;<\/span> allocation<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span><br \/>\n             <span class=\"token keyword\">for<\/span> j <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span>n_resources<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><br \/>\n             <span class=\"token keyword\">for<\/span> i <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span>n_processes<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p>    <span class=\"token comment\"># \u5de5\u4f5c\u5411\u91cf&#xff0c;\u521d\u59cb\u7b49\u4e8e\u53ef\u7528\u8d44\u6e90<\/span><br \/>\n    work <span class=\"token operator\">&#061;<\/span> available<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    finish <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token boolean\">False<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">*<\/span> n_processes<br \/>\n    safe_sequence <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><\/p>\n<p>    <span class=\"token keyword\">while<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>safe_sequence<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> n_processes<span class=\"token punctuation\">:<\/span><br \/>\n        found <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">False<\/span><\/p>\n<p>        <span class=\"token keyword\">for<\/span> i <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span>n_processes<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token keyword\">not<\/span> finish<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                <span class=\"token comment\"># \u68c0\u67e5Need[i] &lt;&#061; Work<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token builtin\">all<\/span><span class=\"token punctuation\">(<\/span>need<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&lt;&#061;<\/span> work<span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span> <span class=\"token keyword\">for<\/span> j <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span>n_resources<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                    <span class=\"token comment\"># \u53ef\u4ee5\u6ee1\u8db3\u8fdb\u7a0bi\u7684\u9700\u6c42<\/span><br \/>\n                    <span class=\"token keyword\">for<\/span> j <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span>n_resources<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n                        work<span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#043;&#061;<\/span> allocation<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># \u56de\u6536\u8d44\u6e90<\/span><\/p>\n<p>                    finish<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">True<\/span><br \/>\n                    safe_sequence<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><br \/>\n                    found <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">True<\/span><br \/>\n                    <span class=\"token keyword\">break<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token keyword\">not<\/span> found<span class=\"token punctuation\">:<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">False<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span>  <span class=\"token comment\"># \u4e0d\u5b89\u5168\u72b6\u6001<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> <span class=\"token boolean\">True<\/span><span class=\"token punctuation\">,<\/span> safe_sequence  <span class=\"token comment\"># \u5b89\u5168\u72b6\u6001<\/span><\/p>\n<p>\u6267\u884c\u8fc7\u7a0b\u6f14\u793a&#xff1a;<\/p>\n<p>\u521d\u59cb\u72b6\u6001&#xff1a;Available &#061; [5, 4, 5]<\/p>\n<p>\u7b2c1\u8f6e&#xff1a;<br \/>\n&#8211; \u68c0\u67e5P0&#xff1a;Need[0] &#061; [7,4,3] &gt; Available[5,4,5] \u274c<br \/>\n&#8211; \u68c0\u67e5P1&#xff1a;Need[1] &#061; [1,2,2] &lt;&#061; Available[5,4,5] \u2705<br \/>\n  \u6267\u884cP1&#xff0c;\u56de\u6536\u8d44\u6e90&#xff1a;Available &#061; [5&#043;2, 4&#043;0, 5&#043;0] &#061; [7,4,5]<\/p>\n<p>\u7b2c2\u8f6e&#xff1a;<br \/>\n&#8211; \u68c0\u67e5P0&#xff1a;Need[0] &#061; [7,4,3] &lt;&#061; Available[7,4,5] \u2705<br \/>\n  \u6267\u884cP0&#xff0c;\u56de\u6536\u8d44\u6e90&#xff1a;Available &#061; [7&#043;0, 4&#043;1, 5&#043;0] &#061; [7,5,5]<\/p>\n<p>\u7b2c3\u8f6e&#xff1a;<br \/>\n&#8211; \u68c0\u67e5P2&#xff1a;Need[2] &#061; [6,0,0] &lt;&#061; Available[7,5,5] \u2705<br \/>\n  \u6267\u884cP2&#xff0c;\u56de\u6536\u8d44\u6e90&#xff1a;Available &#061; [7&#043;3, 5&#043;0, 5&#043;2] &#061; [10,5,7]<\/p>\n<p>\u5b89\u5168\u5e8f\u5217&#xff1a;P1 \u2192 P0 \u2192 P2<br \/>\n\u7ed3\u8bba&#xff1a;\u5f53\u524d\u72b6\u6001\u5b89\u5168&#xff0c;\u53ef\u4ee5\u7ee7\u7eed\u5206\u914d\u8d44\u6e90<\/p>\n<h3>&#x1fa7a; \u6b7b\u9501\u68c0\u6d4b\u4e0e\u6062\u590d<\/h3>\n<h4>\u68c0\u6d4b\u673a\u5236<\/h4>\n<p>\u5b9a\u671f\u68c0\u6d4b&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">DeadlockDetector<\/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\">ScheduledExecutorService<\/span> scheduler <span class=\"token operator\">&#061;<\/span><br \/>\n        <span class=\"token class-name\">Executors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">newScheduledThreadPool<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/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\">startDetection<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        scheduler<span class=\"token punctuation\">.<\/span><span class=\"token function\">scheduleAtFixedRate<\/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 function\">detectDeadlock<\/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 function\">handleDeadlock<\/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 punctuation\">,<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">TimeUnit<\/span><span class=\"token punctuation\">.<\/span>SECONDS<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6bcf5\u79d2\u68c0\u6d4b\u4e00\u6b21<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">detectDeadlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u6784\u5efa\u7b49\u5f85\u56fe<\/span><br \/>\n        <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> waitGraph <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">buildWaitGraph<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u68c0\u6d4b\u73af\u8def<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">hasCycle<\/span><span class=\"token punctuation\">(<\/span>waitGraph<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>\u5b9e\u65f6\u68c0\u6d4b&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u5728\u6bcf\u6b21\u8d44\u6e90\u5206\u914d\u65f6\u68c0\u6d4b<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">synchronized<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">allocateResource<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Process<\/span> process<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Resource<\/span> resource<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5c1d\u8bd5\u5206\u914d<\/span><br \/>\n    resource<span class=\"token punctuation\">.<\/span><span class=\"token function\">allocateTo<\/span><span class=\"token punctuation\">(<\/span>process<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7acb\u5373\u68c0\u6d4b\u6b7b\u9501<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">detectDeadlock<\/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 comment\">\/\/ \u56de\u6eda\u5206\u914d<\/span><br \/>\n        resource<span class=\"token punctuation\">.<\/span><span class=\"token function\">deallocateFrom<\/span><span class=\"token punctuation\">(<\/span>process<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\">return<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>\u6062\u590d\u7b56\u7565<\/h4>\n<h5>1. \u8fdb\u7a0b\u7ec8\u6b62\u6cd5<\/h5>\n<p>\u7ec8\u6b62\u6240\u6709\u6b7b\u9501\u8fdb\u7a0b&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">terminateAllDeadlockedProcesses<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Set<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Process<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> deadlockedProcesses<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Process<\/span> process <span class=\"token operator\">:<\/span> deadlockedProcesses<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        process<span class=\"token punctuation\">.<\/span><span class=\"token function\">terminate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">releaseAllResources<\/span><span class=\"token punctuation\">(<\/span>process<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        log<span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7ec8\u6b62\u6b7b\u9501\u8fdb\u7a0b: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> process<span class=\"token punctuation\">.<\/span><span class=\"token function\">getId<\/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><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u9010\u4e2a\u7ec8\u6b62\u8fdb\u7a0b&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">terminateProcessesOneByOne<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Set<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Process<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> deadlockedProcesses<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">detectDeadlock<\/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 class-name\">Process<\/span> victim <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">selectVictim<\/span><span class=\"token punctuation\">(<\/span>deadlockedProcesses<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        victim<span class=\"token punctuation\">.<\/span><span class=\"token function\">terminate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">releaseAllResources<\/span><span class=\"token punctuation\">(<\/span>victim<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        deadlockedProcesses<span class=\"token punctuation\">.<\/span><span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span>victim<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        log<span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7ec8\u6b62\u8fdb\u7a0b: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> victim<span class=\"token punctuation\">.<\/span><span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n                <span class=\"token string\">&#034;, \u5269\u4f59\u6b7b\u9501\u8fdb\u7a0b: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> deadlockedProcesses<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/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><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Process<\/span> <span class=\"token function\">selectVictim<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Set<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Process<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> processes<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u9009\u62e9\u4ee3\u4ef7\u6700\u5c0f\u7684\u8fdb\u7a0b<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> processes<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token function\">min<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Comparator<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">comparingInt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">calculateTerminationCost<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token function\">orElse<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">null<\/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\">private<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">calculateTerminationCost<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Process<\/span> process<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> process<span class=\"token punctuation\">.<\/span><span class=\"token function\">getExecutionTime<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span>           <span class=\"token comment\">\/\/ \u5df2\u6267\u884c\u65f6\u95f4<\/span><br \/>\n           process<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAllocatedResources<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token comment\">\/\/ \u5360\u7528\u8d44\u6e90\u6570<\/span><br \/>\n           process<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPriority<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>                    <span class=\"token comment\">\/\/ \u4f18\u5148\u7ea7\u6743\u91cd<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>2. \u8d44\u6e90\u5265\u593a\u6cd5<\/h5>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">resolveByResourcePreemption<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Set<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Process<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> deadlockedProcesses<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token function\">detectDeadlock<\/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 comment\">\/\/ \u9009\u62e9\u88ab\u5265\u593a\u8005<\/span><br \/>\n        <span class=\"token class-name\">Process<\/span> victim <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">selectPreemptionVictim<\/span><span class=\"token punctuation\">(<\/span>deadlockedProcesses<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5265\u593a\u90e8\u5206\u8d44\u6e90<\/span><br \/>\n        <span class=\"token class-name\">Set<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Resource<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> preemptedResources <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">preemptResources<\/span><span class=\"token punctuation\">(<\/span>victim<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u56de\u6eda\u8fdb\u7a0b\u5230\u5b89\u5168\u72b6\u6001<\/span><br \/>\n        victim<span class=\"token punctuation\">.<\/span><span class=\"token function\">rollbackToSafePoint<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u91cd\u65b0\u5206\u914d\u8d44\u6e90\u7ed9\u7b49\u5f85\u7684\u8fdb\u7a0b<\/span><br \/>\n        <span class=\"token function\">redistributeResources<\/span><span class=\"token punctuation\">(<\/span>preemptedResources<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        log<span class=\"token punctuation\">.<\/span><span class=\"token function\">info<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4ece\u8fdb\u7a0b &#034;<\/span> <span class=\"token operator\">&#043;<\/span> victim<span class=\"token punctuation\">.<\/span><span class=\"token function\">getId<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034; \u5265\u593a\u4e86 &#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n                preemptedResources<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034; \u4e2a\u8d44\u6e90&#034;<\/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<h3>&#x1f3af; \u9762\u8bd5\u9ad8\u9891\u95ee\u9898\u89e3\u6790<\/h3>\n<h4>Q1: \u8bf7\u63cf\u8ff0\u6b7b\u9501\u7684\u56db\u4e2a\u5fc5\u8981\u6761\u4ef6&#xff0c;\u5e76\u4e3e\u4f8b\u8bf4\u660e<\/h4>\n<p>\u56de\u7b54\u6a21\u677f&#xff1a;<\/p>\n<p>\u6b7b\u9501\u7684\u56db\u4e2a\u5fc5\u8981\u6761\u4ef6\u662f&#xff1a;<\/p>\n<p>1. \u4e92\u65a5\u6761\u4ef6&#xff1a;\u8d44\u6e90\u4e0d\u80fd\u88ab\u5171\u4eab<br \/>\n   \u4f8b\u5b50&#xff1a;\u6253\u5370\u673a\u540c\u65f6\u53ea\u80fd\u88ab\u4e00\u4e2a\u7a0b\u5e8f\u4f7f\u7528<\/p>\n<p>2. \u5360\u6709\u548c\u7b49\u5f85&#xff1a;\u8fdb\u7a0b\u5360\u6709\u8d44\u6e90\u7684\u540c\u65f6\u7b49\u5f85\u5176\u4ed6\u8d44\u6e90<br \/>\n   \u4f8b\u5b50&#xff1a;\u7ebf\u7a0bA\u62ff\u7740\u95011\u7b49\u5f85\u95012&#xff0c;\u7ebf\u7a0bB\u62ff\u7740\u95012\u7b49\u5f85\u95011<\/p>\n<p>3. \u4e0d\u53ef\u5265\u593a&#xff1a;\u8d44\u6e90\u4e0d\u80fd\u88ab\u5f3a\u5236\u56de\u6536<br \/>\n   \u4f8b\u5b50&#xff1a;\u6587\u4ef6\u9501\u5fc5\u987b\u7531\u6301\u6709\u8005\u4e3b\u52a8\u91ca\u653e<\/p>\n<p>4. \u5faa\u73af\u7b49\u5f85&#xff1a;\u8fdb\u7a0b\u95f4\u5f62\u6210\u73af\u5f62\u7b49\u5f85\u94fe<br \/>\n   \u4f8b\u5b50&#xff1a;P1\u7b49P2&#xff0c;P2\u7b49P3&#xff0c;P3\u7b49P1<\/p>\n<p>\u8fd9\u56db\u4e2a\u6761\u4ef6\u5fc5\u987b\u540c\u65f6\u6ee1\u8db3\u624d\u4f1a\u53d1\u751f\u6b7b\u9501&#xff0c;\u7834\u574f\u4efb\u610f\u4e00\u4e2a\u5c31\u80fd\u907f\u514d\u6b7b\u9501\u3002<\/p>\n<h4>Q2: \u5982\u4f55\u5728\u4ee3\u7801\u4e2d\u907f\u514d\u6b7b\u9501&#xff1f;<\/h4>\n<p>\u5b9e\u7528\u6280\u5de7\u603b\u7ed3&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u6280\u5de71&#xff1a;\u6309\u987a\u5e8f\u83b7\u53d6\u9501<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">orderedLocking<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">Object<\/span> lock1 <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getLock1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">Object<\/span> lock2 <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getLock2<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u59cb\u7ec8\u6309\u76f8\u540c\u987a\u5e8f\u83b7\u53d6\u9501<\/span><br \/>\n    <span class=\"token class-name\">Object<\/span> first <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">identityHashCode<\/span><span class=\"token punctuation\">(<\/span>lock1<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">identityHashCode<\/span><span class=\"token punctuation\">(<\/span>lock2<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">?<\/span> lock1 <span class=\"token operator\">:<\/span> lock2<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">Object<\/span> second <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">identityHashCode<\/span><span class=\"token punctuation\">(<\/span>lock1<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">identityHashCode<\/span><span class=\"token punctuation\">(<\/span>lock2<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">?<\/span> lock2 <span class=\"token operator\">:<\/span> lock1<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">synchronized<\/span><span class=\"token punctuation\">(<\/span>first<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">synchronized<\/span><span class=\"token punctuation\">(<\/span>second<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u4e1a\u52a1\u903b\u8f91<\/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 comment\">\/\/ \u6280\u5de72&#xff1a;\u4f7f\u7528\u8d85\u65f6\u9501<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">timeoutLocking<\/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>lock1<span class=\"token punctuation\">.<\/span><span class=\"token function\">tryLock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">TimeUnit<\/span><span class=\"token punctuation\">.<\/span>MILLISECONDS<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>lock2<span class=\"token punctuation\">.<\/span><span class=\"token function\">tryLock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">TimeUnit<\/span><span class=\"token punctuation\">.<\/span>MILLISECONDS<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\">\/\/ \u4e1a\u52a1\u903b\u8f91<\/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\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    lock2<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> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            lock1<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 keyword\">return<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u907f\u514d\u4e86\u6b7b\u9501<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6280\u5de73&#xff1a;\u51cf\u5c11\u9501\u7684\u8303\u56f4<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">minimizeLockScope<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u9884\u5904\u7406&#xff08;\u4e0d\u9700\u8981\u9501&#xff09;<\/span><br \/>\n    <span class=\"token class-name\">Data<\/span> data <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">prepareData<\/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        <span class=\"token comment\">\/\/ \u6700\u5c0f\u5316\u4e34\u754c\u533a<\/span><br \/>\n        <span class=\"token function\">updateSharedResource<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u540e\u5904\u7406&#xff08;\u4e0d\u9700\u8981\u9501&#xff09;<\/span><br \/>\n    <span class=\"token function\">processResult<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>Q3: \u6570\u636e\u5e93\u4e2d\u5982\u4f55\u5904\u7406\u6b7b\u9501&#xff1f;<\/h4>\n<p>\u6570\u636e\u5e93\u6b7b\u9501\u5904\u7406\u673a\u5236&#xff1a;<\/p>\n<p><span class=\"token comment\">&#8212; \u6b7b\u9501\u68c0\u6d4b\u793a\u4f8b<\/span><br \/>\n<span class=\"token comment\">&#8212; \u4f1a\u8bdd1<\/span><br \/>\n<span class=\"token keyword\">BEGIN<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">UPDATE<\/span> accounts <span class=\"token keyword\">SET<\/span> balance <span class=\"token operator\">&#061;<\/span> balance <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">100<\/span> <span class=\"token keyword\">WHERE<\/span> id <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">&#8212; \u7b49\u5f852\u79d2\u6a21\u62df\u4e1a\u52a1\u5904\u7406<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span> SLEEP<span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">UPDATE<\/span> accounts <span class=\"token keyword\">SET<\/span> balance <span class=\"token operator\">&#061;<\/span> balance <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">100<\/span> <span class=\"token keyword\">WHERE<\/span> id <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">COMMIT<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u4f1a\u8bdd2&#xff08;\u540c\u65f6\u6267\u884c&#xff09;<\/span><br \/>\n<span class=\"token keyword\">BEGIN<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">UPDATE<\/span> accounts <span class=\"token keyword\">SET<\/span> balance <span class=\"token operator\">&#061;<\/span> balance <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">50<\/span> <span class=\"token keyword\">WHERE<\/span> id <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">&#8212; \u7b49\u5f852\u79d2\u6a21\u62df\u4e1a\u52a1\u5904\u7406<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span> SLEEP<span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">UPDATE<\/span> accounts <span class=\"token keyword\">SET<\/span> balance <span class=\"token operator\">&#061;<\/span> balance <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">50<\/span> <span class=\"token keyword\">WHERE<\/span> id <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">COMMIT<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u6570\u636e\u5e93\u4f1a\u81ea\u52a8\u68c0\u6d4b\u6b7b\u9501\u5e76\u56de\u6eda\u5176\u4e2d\u4e00\u4e2a\u4e8b\u52a1<\/span><\/p>\n<p>\u907f\u514d\u6570\u636e\u5e93\u6b7b\u9501\u7684\u7b56\u7565&#xff1a;<\/p>\n<p><span class=\"token comment\">&#8212; \u7b56\u75651&#xff1a;\u6309\u56fa\u5b9a\u987a\u5e8f\u8bbf\u95ee\u8868\u548c\u884c<\/span><br \/>\n<span class=\"token comment\">&#8212; \u597d\u7684\u505a\u6cd5&#xff1a;\u59cb\u7ec8\u6309ID\u987a\u5e8f\u66f4\u65b0<\/span><br \/>\n<span class=\"token keyword\">UPDATE<\/span> accounts <span class=\"token keyword\">SET<\/span> balance <span class=\"token operator\">&#061;<\/span> balance <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">100<\/span><br \/>\n<span class=\"token keyword\">WHERE<\/span> id <span class=\"token operator\">IN<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">ORDER<\/span> <span class=\"token keyword\">BY<\/span> id<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u7b56\u75652&#xff1a;\u4f7f\u7528\u9002\u5f53\u7684\u7d22\u5f15\u51cf\u5c11\u9501\u8303\u56f4<\/span><br \/>\n<span class=\"token keyword\">CREATE<\/span> <span class=\"token keyword\">INDEX<\/span> idx_account_id <span class=\"token keyword\">ON<\/span> accounts<span class=\"token punctuation\">(<\/span>id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u7b56\u75653&#xff1a;\u7f29\u77ed\u4e8b\u52a1\u65f6\u95f4<\/span><br \/>\n<span class=\"token keyword\">BEGIN<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">&#8212; \u5c3d\u5feb\u5b8c\u6210\u6240\u6709\u64cd\u4f5c<\/span><br \/>\n<span class=\"token keyword\">UPDATE<\/span> accounts <span class=\"token keyword\">SET<\/span> balance <span class=\"token operator\">&#061;<\/span> balance <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">100<\/span> <span class=\"token keyword\">WHERE<\/span> id <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">UPDATE<\/span> accounts <span class=\"token keyword\">SET<\/span> balance <span class=\"token operator\">&#061;<\/span> balance <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">100<\/span> <span class=\"token keyword\">WHERE<\/span> id <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">COMMIT<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u7b56\u75654&#xff1a;\u4f7f\u7528SELECT &#8230; FOR UPDATE\u663e\u5f0f\u52a0\u9501<\/span><br \/>\n<span class=\"token keyword\">BEGIN<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span> <span class=\"token operator\">*<\/span> <span class=\"token keyword\">FROM<\/span> accounts <span class=\"token keyword\">WHERE<\/span> id <span class=\"token operator\">IN<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">ORDER<\/span> <span class=\"token keyword\">BY<\/span> id <span class=\"token keyword\">FOR<\/span> <span class=\"token keyword\">UPDATE<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">&#8212; \u73b0\u5728\u53ef\u4ee5\u5b89\u5168\u5730\u66f4\u65b0<\/span><br \/>\n<span class=\"token keyword\">UPDATE<\/span> accounts <span class=\"token keyword\">SET<\/span> balance <span class=\"token operator\">&#061;<\/span> balance <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">100<\/span> <span class=\"token keyword\">WHERE<\/span> id <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">UPDATE<\/span> accounts <span class=\"token keyword\">SET<\/span> balance <span class=\"token operator\">&#061;<\/span> balance <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">100<\/span> <span class=\"token keyword\">WHERE<\/span> id <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">COMMIT<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>Q4: \u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u7684\u6b7b\u9501\u5982\u4f55\u5904\u7406&#xff1f;<\/h4>\n<p>\u5206\u5e03\u5f0f\u6b7b\u9501\u7684\u7279\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u8de8\u8282\u70b9\u7684\u8d44\u6e90\u4f9d\u8d56<\/li>\n<li>\u68c0\u6d4b\u590d\u6742\u5ea6\u9ad8<\/li>\n<li>\u7f51\u7edc\u5ef6\u8fdf\u5f71\u54cd<\/li>\n<\/ul>\n<p>\u89e3\u51b3\u65b9\u6848&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u5206\u5e03\u5f0f\u9501\u7684\u6b63\u786e\u5b9e\u73b0<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">DistributedLockManager<\/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\">RedisTemplate<\/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> redisTemplate<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">tryLock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> lockKey<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> clientId<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">long<\/span> expireTime<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u4f7f\u7528SET NX EX\u539f\u5b50\u64cd\u4f5c<\/span><br \/>\n        <span class=\"token class-name\">Boolean<\/span> result <span class=\"token operator\">&#061;<\/span> redisTemplate<span class=\"token punctuation\">.<\/span><span class=\"token function\">opsForValue<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">.<\/span><span class=\"token function\">setIfAbsent<\/span><span class=\"token punctuation\">(<\/span>lockKey<span class=\"token punctuation\">,<\/span> clientId<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Duration<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">ofMillis<\/span><span class=\"token punctuation\">(<\/span>expireTime<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 class-name\">Boolean<\/span><span class=\"token punctuation\">.<\/span>TRUE<span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>result<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\">unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> lockKey<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> clientId<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u4f7f\u7528Lua\u811a\u672c\u786e\u4fdd\u539f\u5b50\u6027<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> script <span class=\"token operator\">&#061;<\/span> <span class=\"token triple-quoted-string string\">&#034;&#034;&#034;<br \/>\n            if redis.call(&#039;get&#039;, KEYS[1]) &#061;&#061; ARGV[1] then<br \/>\n                return redis.call(&#039;del&#039;, KEYS[1])<br \/>\n            else<br \/>\n                return 0<br \/>\n            end<br \/>\n            &#034;&#034;&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        redisTemplate<span class=\"token punctuation\">.<\/span><span class=\"token function\">execute<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">DefaultRedisScript<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span>script<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Long<\/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 class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span>lockKey<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> clientId<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 comment\">\/\/ \u5206\u5e03\u5f0f\u6b7b\u9501\u907f\u514d&#xff1a;\u4f7f\u7528\u8d85\u65f6\u673a\u5236<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">distributedTransfer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> fromAccount<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> toAccount<span class=\"token punctuation\">,<\/span><br \/>\n                                 <span class=\"token class-name\">BigDecimal<\/span> amount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> lockKey1 <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;account:lock:&#034;<\/span> <span class=\"token operator\">&#043;<\/span> fromAccount<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> lockKey2 <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;account:lock:&#034;<\/span> <span class=\"token operator\">&#043;<\/span> toAccount<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> clientId <span class=\"token operator\">&#061;<\/span> UUID<span class=\"token punctuation\">.<\/span><span class=\"token function\">randomUUID<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6309\u5b57\u5178\u5e8f\u83b7\u53d6\u9501&#xff0c;\u907f\u514d\u6b7b\u9501<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> firstLock <span class=\"token operator\">&#061;<\/span> lockKey1<span class=\"token punctuation\">.<\/span><span class=\"token function\">compareTo<\/span><span class=\"token punctuation\">(<\/span>lockKey2<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">?<\/span> lockKey1 <span class=\"token operator\">:<\/span> lockKey2<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> secondLock <span class=\"token operator\">&#061;<\/span> lockKey1<span class=\"token punctuation\">.<\/span><span class=\"token function\">compareTo<\/span><span class=\"token punctuation\">(<\/span>lockKey2<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">?<\/span> lockKey2 <span class=\"token operator\">:<\/span> lockKey1<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u83b7\u53d6\u7b2c\u4e00\u4e2a\u9501<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token function\">tryLock<\/span><span class=\"token punctuation\">(<\/span>firstLock<span class=\"token punctuation\">,<\/span> clientId<span class=\"token punctuation\">,<\/span> <span class=\"token number\">5000<\/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 comment\">\/\/ \u83b7\u53d6\u7b2c\u4e8c\u4e2a\u9501<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span><span class=\"token function\">tryLock<\/span><span class=\"token punctuation\">(<\/span>secondLock<span class=\"token punctuation\">,<\/span> clientId<span class=\"token punctuation\">,<\/span> <span class=\"token number\">5000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">unlock<\/span><span class=\"token punctuation\">(<\/span>firstLock<span class=\"token punctuation\">,<\/span> clientId<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 comment\">\/\/ \u6267\u884c\u8f6c\u8d26\u4e1a\u52a1<\/span><br \/>\n        <span class=\"token function\">performTransfer<\/span><span class=\"token punctuation\">(<\/span>fromAccount<span class=\"token punctuation\">,<\/span> toAccount<span class=\"token punctuation\">,<\/span> amount<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><\/p>\n<p>    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">unlock<\/span><span class=\"token punctuation\">(<\/span>secondLock<span class=\"token punctuation\">,<\/span> clientId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">unlock<\/span><span class=\"token punctuation\">(<\/span>firstLock<span class=\"token punctuation\">,<\/span> clientId<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<h3>&#x1f6e0;\ufe0f \u5b9e\u9645\u9879\u76ee\u4e2d\u7684\u6b7b\u9501\u89e3\u51b3\u6848\u4f8b<\/h3>\n<h4>\u6848\u4f8b1&#xff1a;\u7535\u5546\u7cfb\u7edf\u8ba2\u5355\u5904\u7406\u6b7b\u9501<\/h4>\n<p>\u95ee\u9898\u80cc\u666f&#xff1a;<br \/>\n\u7535\u5546\u7cfb\u7edf\u5728\u5904\u7406\u8ba2\u5355\u65f6&#xff0c;\u9700\u8981\u540c\u65f6\u9501\u5b9a\u7528\u6237\u8d26\u6237\u3001\u5546\u54c1\u5e93\u5b58\u548c\u4f18\u60e0\u5238&#xff0c;\u9ad8\u5e76\u53d1\u4e0b\u7ecf\u5e38\u53d1\u751f\u6b7b\u9501\u3002<\/p>\n<p>\u539f\u59cb\u4ee3\u7801\u95ee\u9898&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u6709\u95ee\u9898\u7684\u5b9e\u73b0<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">createOrder<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Long<\/span> userId<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Long<\/span> productId<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Long<\/span> couponId<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 function\">getUserLock<\/span><span class=\"token punctuation\">(<\/span>userId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>        <span class=\"token comment\">\/\/ \u9501\u7528\u6237<\/span><br \/>\n        <span class=\"token keyword\">synchronized<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">getProductLock<\/span><span class=\"token punctuation\">(<\/span>productId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>   <span class=\"token comment\">\/\/ \u9501\u5546\u54c1<\/span><br \/>\n            <span class=\"token keyword\">synchronized<\/span><span class=\"token punctuation\">(<\/span><span class=\"token function\">getCouponLock<\/span><span class=\"token punctuation\">(<\/span>couponId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/\/ \u9501\u4f18\u60e0\u5238<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u521b\u5efa\u8ba2\u5355\u903b\u8f91<\/span><br \/>\n                <span class=\"token class-name\">User<\/span> user <span class=\"token operator\">&#061;<\/span> userService<span class=\"token punctuation\">.<\/span><span class=\"token function\">getUser<\/span><span class=\"token punctuation\">(<\/span>userId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token class-name\">Product<\/span> product <span class=\"token operator\">&#061;<\/span> productService<span class=\"token punctuation\">.<\/span><span class=\"token function\">getProduct<\/span><span class=\"token punctuation\">(<\/span>productId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token class-name\">Coupon<\/span> coupon <span class=\"token operator\">&#061;<\/span> couponService<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoupon<\/span><span class=\"token punctuation\">(<\/span>couponId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                orderService<span class=\"token punctuation\">.<\/span><span class=\"token function\">createOrder<\/span><span class=\"token punctuation\">(<\/span>user<span class=\"token punctuation\">,<\/span> product<span class=\"token punctuation\">,<\/span> coupon<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 punctuation\">}<\/span><\/p>\n<p>\u6b7b\u9501\u573a\u666f&#xff1a;<\/p>\n<p>\u7528\u6237A\u8d2d\u4e70\u5546\u54c11&#xff0c;\u4f7f\u7528\u4f18\u60e0\u5238X&#xff1a;\u9501\u987a\u5e8f A \u2192 1 \u2192 X<br \/>\n\u7528\u6237B\u8d2d\u4e70\u5546\u54c12&#xff0c;\u4f7f\u7528\u4f18\u60e0\u5238Y&#xff1a;\u9501\u987a\u5e8f B \u2192 2 \u2192 Y<br \/>\n\u7528\u6237A\u8d2d\u4e70\u5546\u54c12&#xff0c;\u4f7f\u7528\u4f18\u60e0\u5238Y&#xff1a;\u9501\u987a\u5e8f A \u2192 2 \u2192 Y<br \/>\n\u7528\u6237B\u8d2d\u4e70\u5546\u54c11&#xff0c;\u4f7f\u7528\u4f18\u60e0\u5238X&#xff1a;\u9501\u987a\u5e8f B \u2192 1 \u2192 X<\/p>\n<p>\u4ea4\u53c9\u6267\u884c\u65f6\u53ef\u80fd\u51fa\u73b0&#xff1a;<br \/>\nA\u9501\u5b9a\u7528\u6237A&#xff0c;B\u9501\u5b9a\u7528\u6237B<br \/>\nA\u7b49\u5f85\u5546\u54c11&#xff08;\u88abB\u9501\u5b9a&#xff09;&#xff0c;B\u7b49\u5f85\u5546\u54c12&#xff08;\u88abA\u9501\u5b9a&#xff09;<\/p>\n<p>\u89e3\u51b3\u65b9\u6848&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">OrderService<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u89e3\u51b3\u65b9\u68481&#xff1a;\u5168\u5c40\u6392\u5e8f\u7b56\u7565<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">createOrderWithGlobalOrdering<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Long<\/span> userId<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Long<\/span> productId<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Long<\/span> couponId<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u6309ID\u5927\u5c0f\u6392\u5e8f&#xff0c;\u786e\u4fdd\u5168\u5c40\u4e00\u81f4\u7684\u52a0\u9501\u987a\u5e8f<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Lockable<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> resources <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">UserLock<\/span><span class=\"token punctuation\">(<\/span>userId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ProductLock<\/span><span class=\"token punctuation\">(<\/span>productId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">CouponLock<\/span><span class=\"token punctuation\">(<\/span>couponId<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        resources<span class=\"token punctuation\">.<\/span><span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Comparator<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">comparing<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Lockable<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getLockId<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">return<\/span> <span class=\"token function\">executeWithOrderedLocks<\/span><span class=\"token punctuation\">(<\/span>resources<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 class-name\">User<\/span> user <span class=\"token operator\">&#061;<\/span> userService<span class=\"token punctuation\">.<\/span><span class=\"token function\">getUser<\/span><span class=\"token punctuation\">(<\/span>userId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">Product<\/span> product <span class=\"token operator\">&#061;<\/span> productService<span class=\"token punctuation\">.<\/span><span class=\"token function\">getProduct<\/span><span class=\"token punctuation\">(<\/span>productId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">Coupon<\/span> coupon <span class=\"token operator\">&#061;<\/span> couponService<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCoupon<\/span><span class=\"token punctuation\">(<\/span>couponId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">return<\/span> orderService<span class=\"token punctuation\">.<\/span><span class=\"token function\">createOrder<\/span><span class=\"token punctuation\">(<\/span>user<span class=\"token punctuation\">,<\/span> product<span class=\"token punctuation\">,<\/span> coupon<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><\/p>\n<p>    <span class=\"token comment\">\/\/ \u89e3\u51b3\u65b9\u68482&#xff1a;\u8d85\u65f6\u91cd\u8bd5\u7b56\u7565<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">createOrderWithTimeout<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Long<\/span> userId<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Long<\/span> productId<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Long<\/span> couponId<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> maxRetries <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> attempt <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> attempt <span class=\"token operator\">&lt;<\/span> maxRetries<span class=\"token punctuation\">;<\/span> attempt<span class=\"token operator\">&#043;&#043;<\/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 function\">tryCreateOrderWithTimeout<\/span><span class=\"token punctuation\">(<\/span>userId<span class=\"token punctuation\">,<\/span> productId<span class=\"token punctuation\">,<\/span> couponId<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1000<\/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\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u968f\u673a\u7b49\u5f85\u65f6\u95f4&#xff0c;\u907f\u514d\u6d3b\u9501<\/span><br \/>\n                <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Random<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">nextInt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">100<\/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\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">InterruptedException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentThread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">interrupt<\/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 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\">private<\/span> <span class=\"token keyword\">boolean<\/span> <span class=\"token function\">tryCreateOrderWithTimeout<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Long<\/span> userId<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Long<\/span> productId<span class=\"token punctuation\">,<\/span><br \/>\n                                            <span class=\"token class-name\">Long<\/span> couponId<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">long<\/span> timeoutMs<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">ReentrantLock<\/span> userLock <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getLockManager<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getUserLock<\/span><span class=\"token punctuation\">(<\/span>userId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">ReentrantLock<\/span> productLock <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getLockManager<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getProductLock<\/span><span class=\"token punctuation\">(<\/span>productId<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">ReentrantLock<\/span> couponLock <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getLockManager<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getCouponLock<\/span><span class=\"token punctuation\">(<\/span>couponId<span class=\"token punctuation\">)<\/span><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>userLock<span class=\"token punctuation\">.<\/span><span class=\"token function\">tryLock<\/span><span class=\"token punctuation\">(<\/span>timeoutMs<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">TimeUnit<\/span><span class=\"token punctuation\">.<\/span>MILLISECONDS<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>productLock<span class=\"token punctuation\">.<\/span><span class=\"token function\">tryLock<\/span><span class=\"token punctuation\">(<\/span>timeoutMs<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">TimeUnit<\/span><span class=\"token punctuation\">.<\/span>MILLISECONDS<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>couponLock<span class=\"token punctuation\">.<\/span><span class=\"token function\">tryLock<\/span><span class=\"token punctuation\">(<\/span>timeoutMs<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">TimeUnit<\/span><span class=\"token punctuation\">.<\/span>MILLISECONDS<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\">\/\/ \u6267\u884c\u8ba2\u5355\u521b\u5efa\u903b\u8f91<\/span><br \/>\n                                    <span class=\"token keyword\">return<\/span> <span class=\"token function\">performOrderCreation<\/span><span class=\"token punctuation\">(<\/span>userId<span class=\"token punctuation\">,<\/span> productId<span class=\"token punctuation\">,<\/span> couponId<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                                    couponLock<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> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                            productLock<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> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    userLock<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> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">InterruptedException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentThread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">interrupt<\/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 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 punctuation\">}<\/span><\/p>\n<h4>\u6848\u4f8b2&#xff1a;\u6570\u636e\u5e93\u8fde\u63a5\u6c60\u6b7b\u9501<\/h4>\n<p>\u95ee\u9898\u63cf\u8ff0&#xff1a;<br \/>\n\u5e94\u7528\u4f7f\u7528\u6570\u636e\u5e93\u8fde\u63a5\u6c60&#xff0c;\u5728\u4e8b\u52a1\u4e2d\u9700\u8981\u83b7\u53d6\u591a\u4e2a\u8fde\u63a5\u65f6\u53d1\u751f\u6b7b\u9501\u3002<\/p>\n<p>\u6b7b\u9501\u573a\u666f&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u4e8b\u52a11&#xff1a;\u8f6c\u8d26\u64cd\u4f5c<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Transactional<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">transfer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> fromAccount<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> toAccount<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">BigDecimal<\/span> amount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">Connection<\/span> conn1 <span class=\"token operator\">&#061;<\/span> dataSource<span class=\"token punctuation\">.<\/span><span class=\"token function\">getConnection<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u83b7\u53d6\u8fde\u63a51<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u67e5\u8be2\u8f6c\u51fa\u8d26\u6237<\/span><br \/>\n    <span class=\"token class-name\">Account<\/span> from <span class=\"token operator\">&#061;<\/span> accountDao<span class=\"token punctuation\">.<\/span><span class=\"token function\">findById<\/span><span class=\"token punctuation\">(<\/span>fromAccount<span class=\"token punctuation\">,<\/span> conn1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token class-name\">Connection<\/span> conn2 <span class=\"token operator\">&#061;<\/span> dataSource<span class=\"token punctuation\">.<\/span><span class=\"token function\">getConnection<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u83b7\u53d6\u8fde\u63a52  <\/span><br \/>\n    <span class=\"token comment\">\/\/ \u67e5\u8be2\u8f6c\u5165\u8d26\u6237<\/span><br \/>\n    <span class=\"token class-name\">Account<\/span> <span class=\"token keyword\">to<\/span> <span class=\"token operator\">&#061;<\/span> accountDao<span class=\"token punctuation\">.<\/span><span class=\"token function\">findById<\/span><span class=\"token punctuation\">(<\/span>toAccount<span class=\"token punctuation\">,<\/span> conn2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u66f4\u65b0\u64cd\u4f5c&#8230;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4e8b\u52a12&#xff1a;\u4f59\u989d\u67e5\u8be2<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Transactional<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">queryBalance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> account1<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> account2<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">Connection<\/span> conn1 <span class=\"token operator\">&#061;<\/span> dataSource<span class=\"token punctuation\">.<\/span><span class=\"token function\">getConnection<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u83b7\u53d6\u8fde\u63a51<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u67e5\u8be2\u8d26\u62371<\/span><\/p>\n<p>    <span class=\"token class-name\">Connection<\/span> conn2 <span class=\"token operator\">&#061;<\/span> dataSource<span class=\"token punctuation\">.<\/span><span class=\"token function\">getConnection<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u83b7\u53d6\u8fde\u63a52<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u67e5\u8be2\u8d26\u62372<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u95ee\u9898\u5206\u6790&#xff1a;<\/p>\n<ul>\n<li>\u8fde\u63a5\u6c60\u5927\u5c0f\u6709\u9650&#xff08;\u5982\u6700\u592710\u4e2a\u8fde\u63a5&#xff09;<\/li>\n<li>\u9ad8\u5e76\u53d1\u65f6\u8fde\u63a5\u6c60\u8017\u5c3d<\/li>\n<li>\u4e8b\u52a1A\u5360\u7528\u8fde\u63a5\u7b49\u5f85\u66f4\u591a\u8fde\u63a5&#xff0c;\u4e8b\u52a1B\u4e5f\u5728\u7b49\u5f85<\/li>\n<\/ul>\n<p>\u89e3\u51b3\u65b9\u6848&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">OptimizedAccountService<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u89e3\u51b3\u65b9\u68481&#xff1a;\u5355\u8fde\u63a5\u4e8b\u52a1<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Transactional<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">transferWithSingleConnection<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> fromAccount<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> toAccount<span class=\"token punctuation\">,<\/span><br \/>\n                                           <span class=\"token class-name\">BigDecimal<\/span> amount<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5728\u540c\u4e00\u4e2a\u4e8b\u52a1\u4e2d\u4f7f\u7528\u540c\u4e00\u4e2a\u8fde\u63a5<\/span><br \/>\n        <span class=\"token class-name\">Account<\/span> from <span class=\"token operator\">&#061;<\/span> accountDao<span class=\"token punctuation\">.<\/span><span class=\"token function\">findById<\/span><span class=\"token punctuation\">(<\/span>fromAccount<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u4f7f\u7528\u4e8b\u52a1\u8fde\u63a5<\/span><br \/>\n        <span class=\"token class-name\">Account<\/span> <span class=\"token keyword\">to<\/span> <span class=\"token operator\">&#061;<\/span> accountDao<span class=\"token punctuation\">.<\/span><span class=\"token function\">findById<\/span><span class=\"token punctuation\">(<\/span>toAccount<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ \u4f7f\u7528\u4e8b\u52a1\u8fde\u63a5<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u9a8c\u8bc1\u4f59\u989d<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>from<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBalance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">compareTo<\/span><span class=\"token punctuation\">(<\/span>amount<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/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\">InsufficientBalanceException<\/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 comment\">\/\/ \u66f4\u65b0\u4f59\u989d<\/span><br \/>\n        from<span class=\"token punctuation\">.<\/span><span class=\"token function\">setBalance<\/span><span class=\"token punctuation\">(<\/span>from<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBalance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">subtract<\/span><span class=\"token punctuation\">(<\/span>amount<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">to<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">setBalance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">to<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getBalance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>amount<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        accountDao<span class=\"token punctuation\">.<\/span><span class=\"token function\">update<\/span><span class=\"token punctuation\">(<\/span>from<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        accountDao<span class=\"token punctuation\">.<\/span><span class=\"token function\">update<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">to<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u89e3\u51b3\u65b9\u68482&#xff1a;\u8fde\u63a5\u6c60\u76d1\u63a7\u548c\u9884\u8b66<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Component<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ConnectionPoolMonitor<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>        <span class=\"token annotation punctuation\">&#064;Scheduled<\/span><span class=\"token punctuation\">(<\/span>fixedRate <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">5000<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">\/\/ \u6bcf5\u79d2\u68c0\u67e5\u4e00\u6b21<\/span><br \/>\n        <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">monitorConnectionPool<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">HikariDataSource<\/span> dataSource <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">HikariDataSource<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>dataSource<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">HikariPoolMXBean<\/span> poolBean <span class=\"token operator\">&#061;<\/span> dataSource<span class=\"token punctuation\">.<\/span><span class=\"token function\">getHikariPoolMXBean<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">int<\/span> activeConnections <span class=\"token operator\">&#061;<\/span> poolBean<span class=\"token punctuation\">.<\/span><span class=\"token function\">getActiveConnections<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> totalConnections <span class=\"token operator\">&#061;<\/span> poolBean<span class=\"token punctuation\">.<\/span><span class=\"token function\">getTotalConnections<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">int<\/span> maxPoolSize <span class=\"token operator\">&#061;<\/span> dataSource<span class=\"token punctuation\">.<\/span><span class=\"token function\">getMaximumPoolSize<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">double<\/span> usage <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">double<\/span><span class=\"token punctuation\">)<\/span> activeConnections <span class=\"token operator\">\/<\/span> maxPoolSize<span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>usage <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0.8<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>  <span class=\"token comment\">\/\/ \u4f7f\u7528\u7387\u8d85\u8fc780%\u9884\u8b66<\/span><br \/>\n                log<span class=\"token punctuation\">.<\/span><span class=\"token function\">warn<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8fde\u63a5\u6c60\u4f7f\u7528\u7387\u8fc7\u9ad8: {}\/{} ({}%)&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                        activeConnections<span class=\"token punctuation\">,<\/span> maxPoolSize<span class=\"token punctuation\">,<\/span><br \/>\n                        <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">format<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%.1f&#034;<\/span><span class=\"token punctuation\">,<\/span> usage <span class=\"token operator\">*<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token comment\">\/\/ \u53ef\u4ee5\u89e6\u53d1\u6269\u5bb9\u6216\u9650\u6d41\u63aa\u65bd<\/span><br \/>\n                <span class=\"token function\">triggerConnectionPoolAlert<\/span><span class=\"token punctuation\">(<\/span>usage<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 comment\">\/\/ \u89e3\u51b3\u65b9\u68483&#xff1a;\u5f02\u6b65\u5904\u7406 &#043; \u961f\u5217<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">AsyncTransferService<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>        <span class=\"token annotation punctuation\">&#064;Async<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;transferExecutor&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">CompletableFuture<\/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\">asyncTransfer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">TransferRequest<\/span> request<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\">\/\/ \u4f7f\u7528\u6d88\u606f\u961f\u5217\u89e3\u8026&#xff0c;\u907f\u514d\u957f\u65f6\u95f4\u5360\u7528\u8fde\u63a5<\/span><br \/>\n                transferQueue<span class=\"token punctuation\">.<\/span><span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">CompletableFuture<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">completedFuture<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/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\">Exception<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">CompletableFuture<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">completedFuture<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">false<\/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 annotation punctuation\">&#064;RabbitListener<\/span><span class=\"token punctuation\">(<\/span>queues <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;transfer.queue&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">processTransfer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">TransferRequest<\/span> request<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u5728\u4e13\u95e8\u7684\u6d88\u8d39\u8005\u7ebf\u7a0b\u4e2d\u5904\u7406&#xff0c;\u907f\u514d\u6b7b\u9501<\/span><br \/>\n            <span class=\"token function\">transferWithSingleConnection<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getFromAccount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                                       request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getToAccount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                                       request<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAmount<\/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><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>&#x1f50d; \u6b7b\u9501\u8bca\u65ad\u5de5\u5177\u548c\u6280\u5de7<\/h3>\n<h4>Java\u5e94\u7528\u6b7b\u9501\u8bca\u65ad<\/h4>\n<p><span class=\"token comment\">\/\/ 1. \u4f7f\u7528ThreadMXBean\u68c0\u6d4b\u6b7b\u9501<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">DeadlockDetector<\/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\">ThreadMXBean<\/span> threadBean <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">ManagementFactory<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getThreadMXBean<\/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\">detectDeadlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> deadlockedThreads <span class=\"token operator\">&#061;<\/span> threadBean<span class=\"token punctuation\">.<\/span><span class=\"token function\">findDeadlockedThreads<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>deadlockedThreads <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">ThreadInfo<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> threadInfos <span class=\"token operator\">&#061;<\/span> threadBean<span class=\"token punctuation\">.<\/span><span class=\"token function\">getThreadInfo<\/span><span class=\"token punctuation\">(<\/span>deadlockedThreads<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u68c0\u6d4b\u5230\u6b7b\u9501&#xff01;\u6d89\u53ca\u7ebf\u7a0b&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ThreadInfo<\/span> threadInfo <span class=\"token operator\">:<\/span> threadInfos<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7ebf\u7a0b: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> threadInfo<span class=\"token punctuation\">.<\/span><span class=\"token function\">getThreadName<\/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 class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u72b6\u6001: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> threadInfo<span class=\"token punctuation\">.<\/span><span class=\"token function\">getThreadState<\/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 class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u9501\u4fe1\u606f: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> threadInfo<span class=\"token punctuation\">.<\/span><span class=\"token function\">getLockInfo<\/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 class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7b49\u5f85\u7684\u9501: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> threadInfo<span class=\"token punctuation\">.<\/span><span class=\"token function\">getLockName<\/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 class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u9501\u62e5\u6709\u8005: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> threadInfo<span class=\"token punctuation\">.<\/span><span class=\"token function\">getLockOwnerName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token comment\">\/\/ \u6253\u5370\u5806\u6808\u8ddf\u8e2a<\/span><br \/>\n                <span class=\"token class-name\">StackTraceElement<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> stackTrace <span class=\"token operator\">&#061;<\/span> threadInfo<span class=\"token punctuation\">.<\/span><span class=\"token function\">getStackTrace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">StackTraceElement<\/span> element <span class=\"token operator\">:<\/span> stackTrace<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\tat &#034;<\/span> <span class=\"token operator\">&#043;<\/span> element<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/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 punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ 2. JMX\u76d1\u63a7\u6b7b\u9501<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Component<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">DeadlockMonitor<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;EventListener<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Async<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">monitorDeadlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">ScheduledExecutorService<\/span> executor <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Executors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">newScheduledThreadPool<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        executor<span class=\"token punctuation\">.<\/span><span class=\"token function\">scheduleAtFixedRate<\/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 class-name\">ThreadMXBean<\/span> threadMXBean <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">ManagementFactory<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getThreadMXBean<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">long<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> deadlockedThreads <span class=\"token operator\">&#061;<\/span> threadMXBean<span class=\"token punctuation\">.<\/span><span class=\"token function\">findDeadlockedThreads<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>deadlockedThreads <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u53d1\u9001\u544a\u8b66<\/span><br \/>\n                alertService<span class=\"token punctuation\">.<\/span><span class=\"token function\">sendDeadlockAlert<\/span><span class=\"token punctuation\">(<\/span>deadlockedThreads<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token comment\">\/\/ \u8bb0\u5f55\u8be6\u7ec6\u4fe1\u606f<\/span><br \/>\n                <span class=\"token function\">logDeadlockDetails<\/span><span class=\"token punctuation\">(<\/span>threadMXBean<span class=\"token punctuation\">,<\/span> deadlockedThreads<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>                <span class=\"token comment\">\/\/ \u53ef\u9009&#xff1a;\u81ea\u52a8\u91cd\u542f\u5e94\u7528<\/span><br \/>\n                <span class=\"token comment\">\/\/ applicationContext.close();<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">TimeUnit<\/span><span class=\"token punctuation\">.<\/span>SECONDS<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>\u547d\u4ee4\u884c\u8bca\u65ad\u5de5\u5177<\/h4>\n<p><span class=\"token comment\"># 1. jstack \u67e5\u770b\u7ebf\u7a0b\u5806\u6808<\/span><br \/>\njstack <span class=\"token operator\">&lt;<\/span>pid<span class=\"token operator\">&gt;<\/span> <span class=\"token operator\">|<\/span> <span class=\"token function\">grep<\/span> -A <span class=\"token number\">5<\/span> -B <span class=\"token number\">5<\/span> <span class=\"token string\">&#034;BLOCKED&#034;<\/span><\/p>\n<p><span class=\"token comment\"># 2. jconsole \u56fe\u5f62\u5316\u76d1\u63a7<\/span><br \/>\njconsole <span class=\"token operator\">&lt;<\/span>pid<span class=\"token operator\">&gt;<\/span><\/p>\n<p><span class=\"token comment\"># 3. jvisualvm \u53ef\u89c6\u5316\u5206\u6790<\/span><br \/>\njvisualvm &#8211;jdkhome <span class=\"token variable\">$JAVA_HOME<\/span><\/p>\n<p><span class=\"token comment\"># 4. arthas \u52a8\u6001\u8bca\u65ad&#xff08;\u63a8\u8350&#xff09;<\/span><br \/>\njava -jar arthas-boot.jar <span class=\"token operator\">&lt;<\/span>pid<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token comment\"># \u5728arthas\u4e2d\u6267\u884c&#xff1a;<\/span><br \/>\nthread -b  <span class=\"token comment\"># \u67e5\u770b\u963b\u585e\u7684\u7ebf\u7a0b<\/span><br \/>\nthread -n <span class=\"token number\">3<\/span> <span class=\"token comment\"># \u67e5\u770bCPU\u4f7f\u7528\u7387\u6700\u9ad8\u76843\u4e2a\u7ebf\u7a0b<\/span><\/p>\n<h4>\u6570\u636e\u5e93\u6b7b\u9501\u8bca\u65ad<\/h4>\n<p><span class=\"token comment\">&#8212; MySQL\u6b7b\u9501\u8bca\u65ad<\/span><br \/>\n<span class=\"token keyword\">SHOW<\/span> <span class=\"token keyword\">ENGINE<\/span> <span class=\"token keyword\">INNODB<\/span> <span class=\"token keyword\">STATUS<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; \u67e5\u770b\u5f53\u524d\u9501\u7b49\u5f85<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span><br \/>\n    r<span class=\"token punctuation\">.<\/span>trx_id waiting_trx_id<span class=\"token punctuation\">,<\/span><br \/>\n    r<span class=\"token punctuation\">.<\/span>trx_mysql_thread_id waiting_thread<span class=\"token punctuation\">,<\/span><br \/>\n    r<span class=\"token punctuation\">.<\/span>trx_query waiting_query<span class=\"token punctuation\">,<\/span><br \/>\n    b<span class=\"token punctuation\">.<\/span>trx_id blocking_trx_id<span class=\"token punctuation\">,<\/span><br \/>\n    b<span class=\"token punctuation\">.<\/span>trx_mysql_thread_id blocking_thread<span class=\"token punctuation\">,<\/span><br \/>\n    b<span class=\"token punctuation\">.<\/span>trx_query blocking_query<br \/>\n<span class=\"token keyword\">FROM<\/span> information_schema<span class=\"token punctuation\">.<\/span>innodb_lock_waits w<br \/>\n<span class=\"token keyword\">INNER<\/span> <span class=\"token keyword\">JOIN<\/span> information_schema<span class=\"token punctuation\">.<\/span>innodb_trx b <span class=\"token keyword\">ON<\/span> b<span class=\"token punctuation\">.<\/span>trx_id <span class=\"token operator\">&#061;<\/span> w<span class=\"token punctuation\">.<\/span>blocking_trx_id<br \/>\n<span class=\"token keyword\">INNER<\/span> <span class=\"token keyword\">JOIN<\/span> information_schema<span class=\"token punctuation\">.<\/span>innodb_trx r <span class=\"token keyword\">ON<\/span> r<span class=\"token punctuation\">.<\/span>trx_id <span class=\"token operator\">&#061;<\/span> w<span class=\"token punctuation\">.<\/span>requesting_trx_id<span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">&#8212; PostgreSQL\u6b7b\u9501\u8bca\u65ad<\/span><br \/>\n<span class=\"token keyword\">SELECT<\/span><br \/>\n    blocked_locks<span class=\"token punctuation\">.<\/span>pid <span class=\"token keyword\">AS<\/span> blocked_pid<span class=\"token punctuation\">,<\/span><br \/>\n    blocked_activity<span class=\"token punctuation\">.<\/span>usename <span class=\"token keyword\">AS<\/span> blocked_user<span class=\"token punctuation\">,<\/span><br \/>\n    blocking_locks<span class=\"token punctuation\">.<\/span>pid <span class=\"token keyword\">AS<\/span> blocking_pid<span class=\"token punctuation\">,<\/span><br \/>\n    blocking_activity<span class=\"token punctuation\">.<\/span>usename <span class=\"token keyword\">AS<\/span> blocking_user<span class=\"token punctuation\">,<\/span><br \/>\n    blocked_activity<span class=\"token punctuation\">.<\/span>query <span class=\"token keyword\">AS<\/span> blocked_statement<span class=\"token punctuation\">,<\/span><br \/>\n    blocking_activity<span class=\"token punctuation\">.<\/span>query <span class=\"token keyword\">AS<\/span> current_statement_in_blocking_process<br \/>\n<span class=\"token keyword\">FROM<\/span> pg_catalog<span class=\"token punctuation\">.<\/span>pg_locks blocked_locks<br \/>\n<span class=\"token keyword\">JOIN<\/span> pg_catalog<span class=\"token punctuation\">.<\/span>pg_stat_activity blocked_activity<br \/>\n    <span class=\"token keyword\">ON<\/span> blocked_activity<span class=\"token punctuation\">.<\/span>pid <span class=\"token operator\">&#061;<\/span> blocked_locks<span class=\"token punctuation\">.<\/span>pid<br \/>\n<span class=\"token keyword\">JOIN<\/span> pg_catalog<span class=\"token punctuation\">.<\/span>pg_locks blocking_locks<br \/>\n    <span class=\"token keyword\">ON<\/span> blocking_locks<span class=\"token punctuation\">.<\/span>locktype <span class=\"token operator\">&#061;<\/span> blocked_locks<span class=\"token punctuation\">.<\/span>locktype<br \/>\n    <span class=\"token operator\">AND<\/span> blocking_locks<span class=\"token punctuation\">.<\/span><span class=\"token keyword\">DATABASE<\/span> <span class=\"token operator\">IS<\/span> <span class=\"token operator\">NOT<\/span> <span class=\"token keyword\">DISTINCT<\/span> <span class=\"token keyword\">FROM<\/span> blocked_locks<span class=\"token punctuation\">.<\/span><span class=\"token keyword\">DATABASE<\/span><br \/>\n    <span class=\"token operator\">AND<\/span> blocking_locks<span class=\"token punctuation\">.<\/span>relation <span class=\"token operator\">IS<\/span> <span class=\"token operator\">NOT<\/span> <span class=\"token keyword\">DISTINCT<\/span> <span class=\"token keyword\">FROM<\/span> blocked_locks<span class=\"token punctuation\">.<\/span>relation<br \/>\n<span class=\"token keyword\">JOIN<\/span> pg_catalog<span class=\"token punctuation\">.<\/span>pg_stat_activity blocking_activity<br \/>\n    <span class=\"token keyword\">ON<\/span> blocking_activity<span class=\"token punctuation\">.<\/span>pid <span class=\"token operator\">&#061;<\/span> blocking_locks<span class=\"token punctuation\">.<\/span>pid<br \/>\n<span class=\"token keyword\">WHERE<\/span> <span class=\"token operator\">NOT<\/span> blocked_locks<span class=\"token punctuation\">.<\/span>GRANTED<span class=\"token punctuation\">;<\/span><\/p>\n<h3>&#x1f393; \u9762\u8bd5\u603b\u7ed3\u548c\u8bb0\u5fc6\u6280\u5de7<\/h3>\n<h4>\u6b7b\u9501\u77e5\u8bc6\u70b9\u601d\u7ef4\u5bfc\u56fe<\/h4>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250814032430-689d56ee470b8.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>\u9762\u8bd5\u91d1\u53e5\u603b\u7ed3<\/h4>\n<li>\n<p>\u201c\u6b7b\u9501\u7684\u672c\u8d28\u662f\u5faa\u73af\u7b49\u5f85&#xff0c;\u89e3\u51b3\u7684\u5173\u952e\u662f\u6253\u7834\u5faa\u73af\u201d<\/p>\n<\/li>\n<li>\n<p>\u201c\u9884\u9632\u80dc\u4e8e\u6cbb\u7597&#xff0c;\u4ee3\u7801\u8bbe\u8ba1\u65f6\u5c31\u8981\u8003\u8651\u9501\u7684\u987a\u5e8f\u201d<\/p>\n<\/li>\n<li>\n<p>\u201c\u8d85\u65f6\u673a\u5236\u662f\u5de5\u7a0b\u5b9e\u8df5\u4e2d\u6700\u5e38\u7528\u7684\u6b7b\u9501\u907f\u514d\u624b\u6bb5\u201d<\/p>\n<\/li>\n<li>\n<p>\u201c\u6b7b\u9501\u68c0\u6d4b\u7684\u4ee3\u4ef7\u901a\u5e38\u6bd4\u6b7b\u9501\u672c\u8eab\u7684\u635f\u5931\u66f4\u5927\u201d<\/p>\n<\/li>\n<li>\n<p>\u201c\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u7684\u6b7b\u9501\u66f4\u96be\u68c0\u6d4b&#xff0c;\u8bbe\u8ba1\u65f6\u5c31\u8981\u907f\u514d\u201d<\/p>\n<\/li>\n<h4>\u5feb\u901f\u8bb0\u5fc6\u53e3\u8bc0<\/h4>\n<p>\u6b7b\u9501\u56db\u6761\u4ef6&#xff0c;\u7f3a\u4e00\u4e0d\u6210\u9501<br \/>\n\u4e92\u65a5\u5360\u7b49\u5f85&#xff0c;\u5265\u593a\u5faa\u73af\u5bfc<br \/>\n\u9884\u9632\u7834\u6761\u4ef6&#xff0c;\u907f\u514d\u7528\u94f6\u884c<br \/>\n\u68c0\u6d4b\u753b\u7b49\u56fe&#xff0c;\u6062\u590d\u9760\u7ec8\u6b62<\/p>\n<h4>\u5e38\u89c1\u9762\u8bd5\u9677\u9631<\/h4>\n<p>\u9677\u96311&#xff1a;\u53ea\u8bb0\u4f4f\u7406\u8bba&#xff0c;\u4e0d\u4f1a\u5b9e\u9645\u5e94\u7528<\/p>\n<p>\u274c \u9519\u8bef\u56de\u7b54&#xff1a;&#034;\u6b7b\u9501\u5c31\u662f\u4e92\u76f8\u7b49\u5f85&#034;<br \/>\n\u2705 \u6b63\u786e\u56de\u7b54&#xff1a;&#034;\u6b7b\u9501\u662f\u5faa\u73af\u7b49\u5f85&#xff0c;\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u6211\u4eec\u901a\u8fc7\u9501\u6392\u5e8f\u6765\u907f\u514d&#xff0c;<br \/>\n   \u6bd4\u5982\u5728\u8f6c\u8d26\u7cfb\u7edf\u4e2d\u6309\u8d26\u6237ID\u987a\u5e8f\u83b7\u53d6\u9501&#8230;&#034;<\/p>\n<p>\u9677\u96312&#xff1a;\u6df7\u6dc6\u6b7b\u9501\u548c\u6d3b\u9501<\/p>\n<p>\u6b7b\u9501&#xff1a;\u8fdb\u7a0b\u90fd\u505c\u6b62&#xff0c;\u4e92\u76f8\u7b49\u5f85<br \/>\n\u6d3b\u9501&#xff1a;\u8fdb\u7a0b\u90fd\u5728\u8fd0\u884c&#xff0c;\u4f46\u65e0\u6cd5\u524d\u8fdb&#xff08;\u5982\u4e24\u4eba\u5728\u8d70\u5eca\u76f8\u9047&#xff0c;\u603b\u662f\u540c\u65f6\u8ba9\u8def&#xff09;<\/p>\n<p>\u9677\u96313&#xff1a;\u8ba4\u4e3a\u6b7b\u9501\u68c0\u6d4b\u5f88\u7b80\u5355<\/p>\n<p>\u5b9e\u9645\u4e0a\u6b7b\u9501\u68c0\u6d4b\u5728\u5927\u578b\u7cfb\u7edf\u4e2d\u975e\u5e38\u590d\u6742&#xff1a;<br \/>\n&#8211; \u5206\u5e03\u5f0f\u73af\u5883\u4e0b\u7684\u5168\u5c40\u68c0\u6d4b<br \/>\n&#8211; \u68c0\u6d4b\u7684\u6027\u80fd\u5f00\u9500<br \/>\n&#8211; \u8bef\u5224\u7684\u5904\u7406<br \/>\n&#8211; \u7f51\u7edc\u5206\u533a\u7684\u5f71\u54cd<\/p>\n<h3>&#x1f680; \u8fdb\u9636\u601d\u8003<\/h3>\n<h4>\u73b0\u4ee3\u7cfb\u7edf\u4e2d\u7684\u6b7b\u9501\u65b0\u6311\u6218<\/h4>\n<li>\u5fae\u670d\u52a1\u67b6\u6784&#xff1a;\u8de8\u670d\u52a1\u7684\u8d44\u6e90\u4f9d\u8d56<\/li>\n<li>\u4e91\u539f\u751f\u5e94\u7528&#xff1a;\u5bb9\u5668\u95f4\u7684\u8d44\u6e90\u7ade\u4e89<\/li>\n<li>\u5927\u6570\u636e\u7cfb\u7edf&#xff1a;\u5206\u5e03\u5f0f\u9501\u7684\u6027\u80fd\u74f6\u9888<\/li>\n<li>\u533a\u5757\u94fe&#xff1a;\u5171\u8bc6\u7b97\u6cd5\u4e2d\u7684\u6b7b\u9501\u907f\u514d<\/li>\n<h4>\u672a\u6765\u53d1\u5c55\u8d8b\u52bf<\/h4>\n<li>AI\u8f85\u52a9\u68c0\u6d4b&#xff1a;\u673a\u5668\u5b66\u4e60\u9884\u6d4b\u6b7b\u9501\u98ce\u9669<\/li>\n<li>\u81ea\u9002\u5e94\u7b97\u6cd5&#xff1a;\u6839\u636e\u7cfb\u7edf\u8d1f\u8f7d\u52a8\u6001\u8c03\u6574\u7b56\u7565<\/li>\n<li>\u786c\u4ef6\u652f\u6301&#xff1a;CPU\u7ea7\u522b\u7684\u6b7b\u9501\u68c0\u6d4b<\/li>\n<li>\u5f62\u5f0f\u5316\u9a8c\u8bc1&#xff1a;\u6570\u5b66\u65b9\u6cd5\u8bc1\u660e\u4ee3\u7801\u65e0\u6b7b\u9501<\/li>\n<hr \/>\n<p>&#x1f4a1; 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