{"id":118729,"date":"2026-10-28T00:56:41","date_gmt":"2026-10-27T16:56:41","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/118729.html"},"modified":"2026-10-28T00:56:41","modified_gmt":"2026-10-27T16:56:41","slug":"cas-%e5%8f%aa%e4%bf%9d%e4%bd%8f%e8%bf%99%e4%b8%80%e6%ac%a1%e5%86%99%e5%85%a5%ef%bc%9a%e7%8a%b6%e6%80%81%e8%bf%81%e7%a7%bb%e8%bf%98%e7%bc%ba%e5%93%aa%e4%ba%9b%e7%ba%a6%e6%9d%9f%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/118729.html","title":{"rendered":"CAS \u53ea\u4fdd\u4f4f\u8fd9\u4e00\u6b21\u5199\u5165\uff1a\u72b6\u6001\u8fc1\u79fb\u8fd8\u7f3a\u54ea\u4e9b\u7ea6\u675f\uff1f"},"content":{"rendered":"<p>\u4e24\u4e2a worker \u540c\u65f6\u63a8\u8fdb\u8ba2\u5355&#xff0c;UPDATE &#8230; WHERE version &#061; 7 \u53ea\u6709\u4e00\u4e2a\u6210\u529f&#xff0c;\u4e8e\u662f\u72b6\u6001\u673a\u5c31\u5b89\u5168\u4e86\u5417&#xff1f;\u5b83\u89e3\u51b3\u4e86\u8fd9\u4e00\u884c\u7684\u7ade\u4e89&#xff0c;\u5374\u6ca1\u6709\u56de\u7b54\u4e09\u4ef6\u4e8b&#xff1a;\u8fd9\u6b21\u8df3\u8f6c\u662f\u5426\u5408\u6cd5&#xff0c;\u5199\u5165\u80fd\u5426\u6301\u4e45\u5316&#xff0c;\u5916\u90e8\u6263\u6b3e\u662f\u5426\u5df2\u7ecf\u6267\u884c\u3002<\/p>\n<h3>\u5148\u628a\u5141\u8bb8\u7684\u8fb9\u5199\u51fa\u6765<\/h3>\n<p>\u72b6\u6001 created \u53ef\u4ee5\u8fdb\u5165 reserved&#xff0c;reserved \u624d\u80fd\u8fdb\u5165 paid&#xff1b;\u53d6\u6d88\u540e\u7684\u8ba2\u5355\u4e0d\u80fd\u51ed\u65e7\u91cd\u8bd5\u518d\u6b21\u652f\u4ed8\u3002\u7248\u672c\u53f7\u9632\u6b62\u62ff\u65e7\u5feb\u7167\u8986\u76d6\u65b0\u503c&#xff0c;\u5408\u6cd5\u8fb9\u96c6\u5408\u9650\u5236\u4e1a\u52a1\u8df3\u8f6c&#xff0c;\u4e24\u8005\u90fd\u8981\u5728\u540c\u4e00\u6b21\u539f\u5b50\u66f4\u65b0\u4e2d\u5224\u65ad\u3002<\/p>\n<p>PostgreSQL \u4e8b\u52a1\u9694\u79bb\u6587\u6863\u89e3\u91ca\u5e76\u53d1\u66f4\u65b0\u65f6\u6761\u4ef6\u53ef\u80fd\u91cd\u65b0\u6c42\u503c\u3002\u6570\u636e\u5e93\u7684\u5177\u4f53\u8bed\u4e49\u5f88\u91cd\u8981&#xff1b;\u4e0d\u80fd\u628a\u4e00\u4e2a\u8fdb\u7a0b\u4e2d\u7684 atomic.CompareAndSwap \u5f53\u6210\u591a\u8fdb\u7a0b\u6301\u4e45\u5b58\u50a8\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261027165638-6ae0d7c6ace45.png\" alt=\"CAS\u3001\u4e1a\u52a1\u8fb9\u548c\u5916\u90e8\u526f\u4f5c\u7528\u5206\u522b\u9a8c\u6536\" \/><\/p>\n<p>\u4e0b\u9762\u662f\u4e32\u884c\u5185\u5b58\u6a21\u578b&#xff0c;\u7528\u6765\u66b4\u9732\u201c\u7248\u672c\u5bf9\u4e86\u4f46\u8df3\u8f6c\u4e0d\u5408\u6cd5\u201d\u7684\u53cd\u4f8b\u3002<\/p>\n<p>allowed &#061; {(&#039;created&#039;, &#039;reserved&#039;), (&#039;created&#039;, &#039;cancelled&#039;),<br \/>\n           (&#039;reserved&#039;, &#039;paid&#039;), (&#039;reserved&#039;, &#039;cancelled&#039;)}<br \/>\nrow &#061; {&#039;state&#039;: &#039;created&#039;, &#039;version&#039;: 1}<br \/>\ndef move(expected_version, expected_state, target):<br \/>\n    if row[&#039;version&#039;] !&#061; expected_version or row[&#039;state&#039;] !&#061; expected_state:<br \/>\n        return False<br \/>\n    if (expected_state, target) not in allowed: return False<br \/>\n    row.update(state&#061;target, version&#061;expected_version &#043; 1)<br \/>\n    return True<br \/>\nassert not move(1, &#039;created&#039;, &#039;paid&#039;)<br \/>\nassert move(1, &#039;created&#039;, &#039;reserved&#039;)<br \/>\nassert not move(1, &#039;created&#039;, &#039;cancelled&#039;)<br \/>\nassert move(2, &#039;reserved&#039;, &#039;paid&#039;)<br \/>\nassert not move(3, &#039;paid&#039;, &#039;reserved&#039;)<br \/>\nprint(row)<\/p>\n<p>\u672c\u5730 Python 3 \u8f93\u51fa paid\u3001\u7248\u672c 3&#xff0c;\u975e\u6cd5\u8df3\u8dc3\u548c\u65e7\u7248\u672c\u5199\u5165\u88ab\u62d2\u7edd\u3002\u672a\u8fd0\u884c\u6570\u636e\u5e93\u5e76\u53d1\u6d4b\u8bd5\u3002\u843d\u5730 SQL \u65f6\u5e94\u540c\u65f6\u7ea6\u675f\u4e3b\u952e\u3001\u79df\u6237\u3001\u7248\u672c\u548c\u6e90\u72b6\u6001&#xff0c;\u5e76\u68c0\u67e5\u53d7\u5f71\u54cd\u884c\u6570\u4e3a 1&#xff1b;\u96f6\u884c\u4e0d\u80fd\u76f4\u63a5\u5f53\u6210\u529f\u3002<\/p>\n<h3>\u6263\u6b3e\u4ecd\u7136\u9700\u8981\u53e6\u4e00\u4efd\u5408\u540c<\/h3>\n<p>\u5982\u679c\u5148\u6263\u6b3e\u518d\u66f4\u65b0\u72b6\u6001&#xff0c;\u6263\u6b3e\u6210\u529f\u540e\u8fdb\u7a0b\u5d29\u6e83&#xff0c;\u91cd\u8bd5\u53ef\u80fd\u518d\u6b21\u6263\u6b3e&#xff1b;\u82e5\u5148\u66f4\u65b0\u4e3a\u5df2\u652f\u4ed8\u518d\u6263\u6b3e&#xff0c;\u53c8\u53ef\u80fd\u8bb0\u5f55\u6210\u529f\u4f46\u8d44\u91d1\u672a\u52a8\u3002\u5e38\u89c1\u505a\u6cd5\u662f\u6301\u4e45\u5316\u652f\u4ed8\u610f\u56fe\u3001\u4f7f\u7528\u7a33\u5b9a\u4e1a\u52a1\u5e42\u7b49\u952e\u3001\u67e5\u8be2\u5916\u90e8\u6700\u7ec8\u7ed3\u679c&#xff0c;\u5e76\u901a\u8fc7\u5bf9\u8d26\u63a8\u8fdb\u72b6\u6001\u3002\u5b83\u4e0d\u662f\u201c\u52a0\u4e86 CAS \u5c31\u6070\u597d\u4e00\u6b21\u201d\u3002<\/p>\n<p>\u5199\u5165 durability\u3001\u552f\u4e00\u952e\u3001\u4e8b\u52a1\u8fb9\u754c\u548c\u6d88\u606f\u6295\u9012\u4ecd\u9700\u5206\u522b\u9a8c\u8bc1\u3002\u5efa\u8bae\u5148\u505a\u4e09\u7ec4\u9694\u79bb\u5b9e\u9a8c&#xff1a;\u4e24\u4e2a\u8fde\u63a5\u7ade\u4e89\u540c\u7248\u672c&#xff1b;\u5199\u5165\u63d0\u4ea4\u524d\u540e\u8fdb\u7a0b\u7ec8\u6b62&#xff1b;\u5916\u90e8\u6210\u529f\u4f46\u54cd\u5e94\u4e22\u5931\u3002\u672c\u6587\u53ea\u5b8c\u6210\u5185\u5b58\u72b6\u6001\u5206\u652f\u9a8c\u8bc1&#xff0c;\u4e0d\u5192\u5145\u4e09\u7ec4\u96c6\u6210\u5b9e\u9a8c\u3002<\/p>\n<p>\u5341\u6708 Agent \u5de5\u5177\u8d8a\u80fd\u81ea\u52a8\u6267\u884c&#xff0c;\u72b6\u6001\u7ea6\u675f\u8d8a\u4e0d\u80fd\u7559\u7ed9\u81ea\u7136\u8bed\u8a00\u6307\u4ee4\u3002\u53d1\u5e03\u524d\u68c0\u67e5\u771f\u5b9e\u8868\u7ea6\u675f\u548c\u65e7\u4efb\u52a1\u72b6\u6001&#xff0c;\u518d\u5f00\u653e\u65b0\u7684\u52a8\u4f5c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e24\u4e2a worker \u540c\u65f6\u63a8\u8fdb\u8ba2\u5355&#xff0c;UPDATE &#8230; 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