{"id":10020490,"date":"2024-12-14T19:30:18","date_gmt":"2024-12-14T11:30:18","guid":{"rendered":"https:\/\/itmax.cn\/?p=10020490"},"modified":"2024-12-14T19:30:18","modified_gmt":"2024-12-14T11:30:18","slug":"%e8%94%9a%e6%9d%a5-java-%e5%90%8e%e7%ab%af%e5%ae%9e%e4%b9%a0%e7%bb%88%e4%ba%8e-oc-%e4%ba%86%ef%bc%8c%e5%88%86%e4%ba%ab%e4%b8%80%e4%b8%8b%e9%9d%a2%e7%bb%8f%ef%bc%81","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10020490","title":{"rendered":"\u851a\u6765 Java \u540e\u7aef\u5b9e\u4e60\u7ec8\u4e8e OC \u4e86\uff0c\u5206\u4eab\u4e00\u4e0b\u9762\u7ecf\uff01"},"content":{"rendered":"<p>\u4f60\u597d\uff0c\u6211\u662f Guide\u3002\u6709\u597d\u4e45\u6ca1\u6709\u5206\u4eab\u5b9e\u4e60\u9762\u7ecf\u8be6\u89e3\u4e86\uff0c\u4eca\u5929\u6765\u5206\u4eab\u4e00\u7bc7\u851a\u6765\u7684 Java \u5c97\u4f4d\u5b9e\u4e60\u9762\u7ecf\uff0c\u9644\u5e26\u8be6\u7ec6\u53c2\u8003\u7b54\u6848\uff0c\u5927\u5bb6\u611f\u53d7\u4e00\u4e0b\u96be\u5ea6\u600e\u4e48\u6837\u3002<\/p>\n<h3>1\u3001\u81ea\u6211\u4ecb\u7ecd<\/h3>\n<p>\u4e00\u4e2a\u597d\u7684\u81ea\u6211\u4ecb\u7ecd\u5e94\u8be5\u5305\u542b\u8fd9\u51e0\u70b9\u8981\u7d20\uff1a<\/p>\n<ol>\n<li>\u7528\u7b80\u5355\u7684\u8bdd\u8bf4\u6e05\u695a\u81ea\u5df1\u4e3b\u8981\u7684\u6280\u672f\u6808\u4e8e\u64c5\u957f\u7684\u9886\u57df\uff0c\u4f8b\u5982 Java \u540e\u7aef\u5f00\u53d1\u3001\u5206\u5e03\u5f0f\u7cfb\u7edf\u5f00\u53d1\uff1b<\/li>\n<li>\u628a\u91cd\u70b9\u653e\u5728\u81ea\u5df1\u7684\u4f18\u52bf\u4e0a\uff0c\u91cd\u70b9\u7a81\u51fa\u81ea\u5df1\u7684\u80fd\u529b\u6bd4\u5982\u81ea\u5df1\u7684\u5b9a\u4f4d\u7684 bug \u7684\u80fd\u529b\u7279\u522b\u5389\u5bb3\uff1b<\/li>\n<li>\u907f\u514d\u907f\u5b9e\u5c31\u865a\uff0c\u9002\u5f53\u4e3e\u4f8b\u4f53\u73b0\u81ea\u5df1\u7684\u80fd\u529b\uff0c\u4f8b\u5982\u8fc7\u5f80\u7684\u6bd4\u8d5b\u7ecf\u5386\u3001\u5b9e\u4e60\u7ecf\u5386\uff1b<\/li>\n<li>\u81ea\u6211\u4ecb\u7ecd\u7684\u65f6\u95f4\u4e0d\u5b9c\u8fc7\u957f\uff0c\u4e00\u822c\u662f 1~2 \u5206\u949f\u4e4b\u95f4\u3002<\/li>\n<\/ol>\n<h3>2\u3001\u4ecb\u7ecd\u81ea\u5df1\u7684\u9879\u76ee<\/h3>\n<p>\u4f5c\u4e3a\u6c42\u804c\u8005\uff0c\u6211\u4eec\u53ef\u4ee5\u4ece\u54ea\u4e9b\u65b9\u6848\u53bb\u51c6\u5907\u9879\u76ee\u7ecf\u5386\u7684\u56de\u7b54\uff1a<\/p>\n<ol>\n<li>\u4f60\u5bf9\u9879\u76ee\u57fa\u672c\u60c5\u51b5\uff08\u6bd4\u5982\u9879\u76ee\u80cc\u666f\u3001\u6838\u5fc3\u529f\u80fd\uff09\u4ee5\u53ca\u6574\u4f53\u8bbe\u8ba1\uff08\u6bd4\u5982\u6280\u672f\u6808\u3001\u7cfb\u7edf\u67b6\u6784\uff09\u7684\u4e86\u89e3\uff08\u9762\u8bd5\u5b98\u53ef\u80fd\u4f1a\u8ba9\u4f60\u753b\u7cfb\u7edf\u7684\u67b6\u6784\u56fe\u3001\u8ba9\u4f60\u8bb2\u89e3\u67d0\u4e2a\u6a21\u5757\u6216\u529f\u80fd\u7684\u6570\u636e\u5e93\u8868\u8bbe\u8ba1\uff09<\/li>\n<li>\u4f60\u5728\u8fd9\u4e2a\u9879\u76ee\u4e2d\u4f60\u62c5\u4efb\u4e86\u4ec0\u4e48\u89d2\u8272\uff1f\u8d1f\u8d23\u4e86\u4ec0\u4e48\uff1f\u6709\u4ec0\u4e48\u8d21\u732e\uff1f\uff08\u5177\u4f53\u8bf4\u660e\u4f60\u5728\u9879\u76ee\u4e2d\u7684\u804c\u8d23\u548c\u8d21\u732e\uff09<\/li>\n<li>\u4f60\u5728\u8fd9\u4e2a\u9879\u76ee\u4e2d\u662f\u5426\u89e3\u51b3\u8fc7\u4ec0\u4e48\u95ee\u9898\uff1f\u600e\u4e48\u89e3\u51b3\u7684\uff1f\u6536\u83b7\u4e86\u4ec0\u4e48\uff1f\uff08\u5c55\u73b0\u89e3\u51b3\u95ee\u9898\u7684\u80fd\u529b\uff09<\/li>\n<li>\u4f60\u5728\u8fd9\u4e2a\u9879\u76ee\u7528\u5230\u4e86\u54ea\u4e9b\u6280\u672f\uff1f\u8fd9\u4e9b\u6280\u672f\u4f60\u5403\u900f\u4e86\u6ca1\u6709\uff1f\uff08\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u4f60\u7684\u9879\u76ee\u7ecf\u5386\u4f7f\u7528\u4e86 Seata \u6765\u505a\u5206\u5e03\u5f0f\u4e8b\u52a1\uff0c\u90a3 Seata \u76f8\u5173\u7684\u95ee\u9898\u4f60\u8981\u63d0\u524d\u51c6\u5907\u4e00\u4e0b\u5427\uff0c\u6bd4\u5982\u8bf4 Seata \u652f\u6301\u54ea\u4e9b\u914d\u7f6e\u4e2d\u5fc3\u3001Seata \u7684\u4e8b\u52a1\u5206\u7ec4\u662f\u600e\u4e48\u505a\u7684\u3001Seata \u652f\u6301\u54ea\u4e9b\u4e8b\u52a1\u6a21\u5f0f\uff0c\u600e\u4e48\u9009\u62e9\uff1f\uff09<\/li>\n<li>\u4f60\u5728\u8fd9\u4e2a\u9879\u76ee\u4e2d\u72af\u8fc7\u7684\u9519\u8bef\uff0c\u6700\u540e\u662f\u600e\u4e48\u5f25\u8865\u7684\uff1f\uff08\u627f\u8ba4\u4e0d\u8db3\u5e76\u6539\u8fdb\u624d\u80fd\u8d70\u7684\u66f4\u8fdc\uff09<\/li>\n<li>\u4ece\u8fd9\u4e2a\u9879\u76ee\u4e2d\u4f60\u5b66\u4f1a\u4e86\u90a3\u4e9b\u4e1c\u897f\uff1f\u5b66\u4f1a\u4e86\u90a3\u4e9b\u65b0\u6280\u672f\u7684\u4f7f\u7528\uff1f\uff08\u603b\u7ed3\u4f60\u5728\u8fd9\u4e2a\u9879\u76ee\u4e2d\u7684\u6536\u83b7\uff09<\/li>\n<\/ol>\n<h3>3\u3001\u7ebf\u7a0b\u6c60\u4f5c\u7528\u662f\u4ec0\u4e48\uff1f<\/h3>\n<p><strong>\u7ebf\u7a0b\u6c60<\/strong>\u63d0\u4f9b\u4e86\u4e00\u79cd\u9650\u5236\u548c\u7ba1\u7406\u8d44\u6e90\uff08\u5305\u62ec\u6267\u884c\u4e00\u4e2a\u4efb\u52a1\uff09\u7684\u65b9\u5f0f\u3002 \u6bcf\u4e2a<strong>\u7ebf\u7a0b\u6c60<\/strong>\u8fd8\u7ef4\u62a4\u4e00\u4e9b\u57fa\u672c\u7edf\u8ba1\u4fe1\u606f\uff0c\u4f8b\u5982\u5df2\u5b8c\u6210\u4efb\u52a1\u7684\u6570\u91cf\u3002<\/p>\n<p>\u8fd9\u91cc\u501f\u7528\u300aJava \u5e76\u53d1\u7f16\u7a0b\u7684\u827a\u672f\u300b\u63d0\u5230\u7684\u6765\u8bf4\u4e00\u4e0b<strong>\u4f7f\u7528\u7ebf\u7a0b\u6c60\u7684\u597d\u5904<\/strong>\uff1a<\/p>\n<ul>\n<li><strong>\u964d\u4f4e\u8d44\u6e90\u6d88\u8017<\/strong>\u3002\u901a\u8fc7\u91cd\u590d\u5229\u7528\u5df2\u521b\u5efa\u7684\u7ebf\u7a0b\u964d\u4f4e\u7ebf\u7a0b\u521b\u5efa\u548c\u9500\u6bc1\u9020\u6210\u7684\u6d88\u8017\u3002<\/li>\n<li><strong>\u63d0\u9ad8\u54cd\u5e94\u901f\u5ea6<\/strong>\u3002\u5f53\u4efb\u52a1\u5230\u8fbe\u65f6\uff0c\u4efb\u52a1\u53ef\u4ee5\u4e0d\u9700\u8981\u7b49\u5230\u7ebf\u7a0b\u521b\u5efa\u5c31\u80fd\u7acb\u5373\u6267\u884c\u3002<\/li>\n<li><strong>\u63d0\u9ad8\u7ebf\u7a0b\u7684\u53ef\u7ba1\u7406\u6027<\/strong>\u3002\u7ebf\u7a0b\u662f\u7a00\u7f3a\u8d44\u6e90\uff0c\u5982\u679c\u65e0\u9650\u5236\u7684\u521b\u5efa\uff0c\u4e0d\u4ec5\u4f1a\u6d88\u8017\u7cfb\u7edf\u8d44\u6e90\uff0c\u8fd8\u4f1a\u964d\u4f4e\u7cfb\u7edf\u7684\u7a33\u5b9a\u6027\uff0c\u4f7f\u7528\u7ebf\u7a0b\u6c60\u53ef\u4ee5\u8fdb\u884c\u7edf\u4e00\u7684\u5206\u914d\uff0c\u8c03\u4f18\u548c\u76d1\u63a7\u3002<\/li>\n<\/ul>\n<h3>4\u3001\u7ebf\u7a0b\u6c60\u53c2\u6570\u6709\u54ea\u4e9b\uff1f<\/h3>\n<p><code>ThreadPoolExecutor<\/code> 3 \u4e2a\u6700\u91cd\u8981\u7684\u53c2\u6570\uff1a<\/p>\n<ul>\n<li><code>corePoolSize<\/code> : \u4efb\u52a1\u961f\u5217\u672a\u8fbe\u5230\u961f\u5217\u5bb9\u91cf\u65f6\uff0c\u6700\u5927\u53ef\u4ee5\u540c\u65f6\u8fd0\u884c\u7684\u7ebf\u7a0b\u6570\u91cf\u3002<\/li>\n<li><code>maximumPoolSize<\/code> : \u4efb\u52a1\u961f\u5217\u4e2d\u5b58\u653e\u7684\u4efb\u52a1\u8fbe\u5230\u961f\u5217\u5bb9\u91cf\u7684\u65f6\u5019\uff0c\u5f53\u524d\u53ef\u4ee5\u540c\u65f6\u8fd0\u884c\u7684\u7ebf\u7a0b\u6570\u91cf\u53d8\u4e3a\u6700\u5927\u7ebf\u7a0b\u6570\u3002<\/li>\n<li><code>workQueue<\/code>: \u65b0\u4efb\u52a1\u6765\u7684\u65f6\u5019\u4f1a\u5148\u5224\u65ad\u5f53\u524d\u8fd0\u884c\u7684\u7ebf\u7a0b\u6570\u91cf\u662f\u5426\u8fbe\u5230\u6838\u5fc3\u7ebf\u7a0b\u6570\uff0c\u5982\u679c\u8fbe\u5230\u7684\u8bdd\uff0c\u65b0\u4efb\u52a1\u5c31\u4f1a\u88ab\u5b58\u653e\u5728\u961f\u5217\u4e2d\u3002<\/li>\n<\/ul>\n<p><code>ThreadPoolExecutor<\/code>\u5176\u4ed6\u5e38\u89c1\u53c2\u6570 :<\/p>\n<ul>\n<li><code>keepAliveTime<\/code>:\u7ebf\u7a0b\u6c60\u4e2d\u7684\u7ebf\u7a0b\u6570\u91cf\u5927\u4e8e <code>corePoolSize<\/code> \u7684\u65f6\u5019\uff0c\u5982\u679c\u8fd9\u65f6\u6ca1\u6709\u65b0\u7684\u4efb\u52a1\u63d0\u4ea4\uff0c\u6838\u5fc3\u7ebf\u7a0b\u5916\u7684\u7ebf\u7a0b\u4e0d\u4f1a\u7acb\u5373\u9500\u6bc1\uff0c\u800c\u662f\u4f1a\u7b49\u5f85\uff0c\u76f4\u5230\u7b49\u5f85\u7684\u65f6\u95f4\u8d85\u8fc7\u4e86 <code>keepAliveTime<\/code>\u624d\u4f1a\u88ab\u56de\u6536\u9500\u6bc1\u3002<\/li>\n<li><code>unit<\/code> : <code>keepAliveTime<\/code> \u53c2\u6570\u7684\u65f6\u95f4\u5355\u4f4d\u3002<\/li>\n<li><code>threadFactory<\/code> :executor \u521b\u5efa\u65b0\u7ebf\u7a0b\u7684\u65f6\u5019\u4f1a\u7528\u5230\u3002<\/li>\n<li><code>handler<\/code> :\u62d2\u7edd\u7b56\u7565\uff08\u540e\u9762\u4f1a\u5355\u72ec\u8be6\u7ec6\u4ecb\u7ecd\u4e00\u4e0b\uff09\u3002<\/li>\n<\/ul>\n<p>\u4e0b\u9762\u8fd9\u5f20\u56fe\u53ef\u4ee5\u52a0\u6df1\u4f60\u5bf9\u7ebf\u7a0b\u6c60\u4e2d\u5404\u4e2a\u53c2\u6570\u7684\u76f8\u4e92\u5173\u7cfb\u7684\u7406\u89e3\uff08\u56fe\u7247\u6765\u6e90\uff1a\u300aJava \u6027\u80fd\u8c03\u4f18\u5b9e\u6218\u300b\uff09\uff1a<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000045602342\" alt=\"\u7ebf\u7a0b\u6c60\u5404\u4e2a\u53c2\u6570\u7684\u5173\u7cfb\" title=\"\u7ebf\u7a0b\u6c60\u5404\u4e2a\u53c2\u6570\u7684\u5173\u7cfb\"><\/p>\n<h3>5\u3001\u7ebf\u7a0b\u6c60\u7684\u62d2\u7edd\u7b56\u7565\u6709\u54ea\u4e9b\uff1f<\/h3>\n<p>\u5982\u679c\u5f53\u524d\u540c\u65f6\u8fd0\u884c\u7684\u7ebf\u7a0b\u6570\u91cf\u8fbe\u5230\u6700\u5927\u7ebf\u7a0b\u6570\u91cf\u5e76\u4e14\u961f\u5217\u4e5f\u5df2\u7ecf\u88ab\u653e\u6ee1\u4e86\u4efb\u52a1\u65f6\uff0c<code>ThreadPoolExecutor<\/code> \u5b9a\u4e49\u4e00\u4e9b\u7b56\u7565:<\/p>\n<ul>\n<li><code>ThreadPoolExecutor.AbortPolicy<\/code>\uff1a\u629b\u51fa <code>RejectedExecutionException<\/code>\u6765\u62d2\u7edd\u65b0\u4efb\u52a1\u7684\u5904\u7406\u3002<\/li>\n<li><code>ThreadPoolExecutor.CallerRunsPolicy<\/code>\uff1a\u8c03\u7528\u6267\u884c\u81ea\u5df1\u7684\u7ebf\u7a0b\u8fd0\u884c\u4efb\u52a1\uff0c\u4e5f\u5c31\u662f\u76f4\u63a5\u5728\u8c03\u7528<code>execute<\/code>\u65b9\u6cd5\u7684\u7ebf\u7a0b\u4e2d\u8fd0\u884c(<code>run<\/code>)\u88ab\u62d2\u7edd\u7684\u4efb\u52a1\uff0c\u5982\u679c\u6267\u884c\u7a0b\u5e8f\u5df2\u5173\u95ed\uff0c\u5219\u4f1a\u4e22\u5f03\u8be5\u4efb\u52a1\u3002\u56e0\u6b64\u8fd9\u79cd\u7b56\u7565\u4f1a\u964d\u4f4e\u5bf9\u4e8e\u65b0\u4efb\u52a1\u63d0\u4ea4\u901f\u5ea6\uff0c\u5f71\u54cd\u7a0b\u5e8f\u7684\u6574\u4f53\u6027\u80fd\u3002\u5982\u679c\u4f60\u7684\u5e94\u7528\u7a0b\u5e8f\u53ef\u4ee5\u627f\u53d7\u6b64\u5ef6\u8fdf\u5e76\u4e14\u4f60\u8981\u6c42\u4efb\u4f55\u4e00\u4e2a\u4efb\u52a1\u8bf7\u6c42\u90fd\u8981\u88ab\u6267\u884c\u7684\u8bdd\uff0c\u4f60\u53ef\u4ee5\u9009\u62e9\u8fd9\u4e2a\u7b56\u7565\u3002<\/li>\n<li><code>ThreadPoolExecutor.DiscardPolicy<\/code>\uff1a\u4e0d\u5904\u7406\u65b0\u4efb\u52a1\uff0c\u76f4\u63a5\u4e22\u5f03\u6389\u3002<\/li>\n<li><code>ThreadPoolExecutor.DiscardOldestPolicy<\/code>\uff1a\u6b64\u7b56\u7565\u5c06\u4e22\u5f03\u6700\u65e9\u7684\u672a\u5904\u7406\u7684\u4efb\u52a1\u8bf7\u6c42\u3002<\/li>\n<\/ul>\n<p>\u4e3e\u4e2a\u4f8b\u5b50\uff1aSpring \u901a\u8fc7 <code>ThreadPoolTaskExecutor<\/code> \u6216\u8005\u6211\u4eec\u76f4\u63a5\u901a\u8fc7 <code>ThreadPoolExecutor<\/code> \u7684\u6784\u9020\u51fd\u6570\u521b\u5efa\u7ebf\u7a0b\u6c60\u7684\u65f6\u5019\uff0c\u5f53\u6211\u4eec\u4e0d\u6307\u5b9a <code>RejectedExecutionHandler<\/code> \u62d2\u7edd\u7b56\u7565\u6765\u914d\u7f6e\u7ebf\u7a0b\u6c60\u7684\u65f6\u5019\uff0c\u9ed8\u8ba4\u4f7f\u7528\u7684\u662f <code>AbortPolicy<\/code>\u3002\u5728\u8fd9\u79cd\u62d2\u7edd\u7b56\u7565\u4e0b\uff0c\u5982\u679c\u961f\u5217\u6ee1\u4e86\uff0c<code>ThreadPoolExecutor<\/code> \u5c06\u629b\u51fa <code>RejectedExecutionException<\/code> \u5f02\u5e38\u6765\u62d2\u7edd\u65b0\u6765\u7684\u4efb\u52a1 \uff0c\u8fd9\u4ee3\u8868\u4f60\u5c06\u4e22\u5931\u5bf9\u8fd9\u4e2a\u4efb\u52a1\u7684\u5904\u7406\u3002\u5982\u679c\u4e0d\u60f3\u4e22\u5f03\u4efb\u52a1\u7684\u8bdd\uff0c\u53ef\u4ee5\u4f7f\u7528<code>CallerRunsPolicy<\/code>\u3002<code>CallerRunsPolicy<\/code> \u548c\u5176\u4ed6\u7684\u51e0\u4e2a\u7b56\u7565\u4e0d\u540c\uff0c\u5b83\u65e2\u4e0d\u4f1a\u629b\u5f03\u4efb\u52a1\uff0c\u4e5f\u4e0d\u4f1a\u629b\u51fa\u5f02\u5e38\uff0c\u800c\u662f\u5c06\u4efb\u52a1\u56de\u9000\u7ed9\u8c03\u7528\u8005\uff0c\u4f7f\u7528\u8c03\u7528\u8005\u7684\u7ebf\u7a0b\u6765\u6267\u884c\u4efb\u52a1\u3002<\/p>\n<pre><code class=\"java\">public static class CallerRunsPolicy implements RejectedExecutionHandler {\n\n        public CallerRunsPolicy() { }\n\n        public void rejectedExecution(Runnable r, ThreadPoolExecutor e) {\n            if (!e.isShutdown()) {\n                \/\/ \u76f4\u63a5\u4e3b\u7ebf\u7a0b\u6267\u884c\uff0c\u800c\u4e0d\u662f\u7ebf\u7a0b\u6c60\u4e2d\u7684\u7ebf\u7a0b\u6267\u884c\n                r.run();\n            }\n        }\n    }<\/code><\/pre>\n<p>\u66f4\u591a Java \u5e76\u53d1\u9762\u8bd5\u9898\uff0c\u8bf7\u9605\u8bfb\u8fd9\u51e0\u7bc7\u6587\u7ae0\uff1a<\/p>\n<ul>\n<li><a href=\"https:\/\/link.segmentfault.com\/?enc=pWOvpRrb449b7iUs5uDGlQ%3D%3D.Ts5%2BO8tHwTWGc3P5BpTkxjptKeXsVFaQYgdDaFOpBlof86DEyKSiXy7yZ7hESkDOOZ9QLgc%2BoBi192fG9AUdQ9Q7h9E5XOnH%2FFtUyZx753Q%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Java \u5e76\u53d1\u5e38\u89c1\u9762\u8bd5\u9898\u603b\u7ed3\uff08\u4e0a\uff09<\/a><\/li>\n<li><a href=\"https:\/\/link.segmentfault.com\/?enc=M5ghYB6r3RrHzILAnf5Now%3D%3D.5kZD5Lj%2BjaR02B8CYp0lAFKNZQC2AW%2FN9oQ3oOG8us24Q3mmFMo0XM7JarjunQeR2G8%2FbNOGMST5evMm%2F%2B%2B45zBMYnGBg3CwZSgJ3CBHGms%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Java \u5e76\u53d1\u5e38\u89c1\u9762\u8bd5\u9898\u603b\u7ed3\uff08\u4e2d\uff09<\/a><\/li>\n<li><a href=\"https:\/\/link.segmentfault.com\/?enc=SyXcxTq%2BKawY7MGA5lT2BQ%3D%3D.tLUb83IeuXgkWmDNUFujVF6mgqDd4phWD0FXu4BrUhwOXQtLXGqrvtL%2F7FZ65bzdJNXWty%2BEawfLSrjNjOudLeOblYPfUcRPfVes5T0YMOE%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Java \u5e76\u53d1\u5e38\u89c1\u9762\u8bd5\u9898\u603b\u7ed3\uff08\u4e0b\uff09<\/a><\/li>\n<\/ul>\n<h3>6\u3001MySQL \u9501\u673a\u5236<\/h3>\n<p>\u9501\u662f\u4e00\u79cd\u5e38\u89c1\u7684\u5e76\u53d1\u4e8b\u52a1\u7684\u63a7\u5236\u65b9\u5f0f\u3002<\/p>\n<h4>\u8868\u7ea7\u9501\u548c\u884c\u7ea7\u9501<\/h4>\n<p><strong>\u8868\u7ea7\u9501\u548c\u884c\u7ea7\u9501\u5bf9\u6bd4<\/strong>\uff1a<\/p>\n<ul>\n<li><strong>\u8868\u7ea7\u9501\uff1a<\/strong> MySQL \u4e2d\u9501\u5b9a\u7c92\u5ea6\u6700\u5927\u7684\u4e00\u79cd\u9501\uff08\u5168\u5c40\u9501\u9664\u5916\uff09\uff0c\u662f\u9488\u5bf9\u975e\u7d22\u5f15\u5b57\u6bb5\u52a0\u7684\u9501\uff0c\u5bf9\u5f53\u524d\u64cd\u4f5c\u7684\u6574\u5f20\u8868\u52a0\u9501\uff0c\u5b9e\u73b0\u7b80\u5355\uff0c\u8d44\u6e90\u6d88\u8017\u4e5f\u6bd4\u8f83\u5c11\uff0c\u52a0\u9501\u5feb\uff0c\u4e0d\u4f1a\u51fa\u73b0\u6b7b\u9501\u3002\u4e0d\u8fc7\uff0c\u89e6\u53d1\u9501\u51b2\u7a81\u7684\u6982\u7387\u6700\u9ad8\uff0c\u9ad8\u5e76\u53d1\u4e0b\u6548\u7387\u6781\u4f4e\u3002\u8868\u7ea7\u9501\u548c\u5b58\u50a8\u5f15\u64ce\u65e0\u5173\uff0cMyISAM \u548c InnoDB \u5f15\u64ce\u90fd\u652f\u6301\u8868\u7ea7\u9501\u3002<\/li>\n<li><strong>\u884c\u7ea7\u9501\uff1a<\/strong> MySQL \u4e2d\u9501\u5b9a\u7c92\u5ea6\u6700\u5c0f\u7684\u4e00\u79cd\u9501\uff0c\u662f <strong>\u9488\u5bf9\u7d22\u5f15\u5b57\u6bb5\u52a0\u7684\u9501<\/strong> \uff0c\u53ea\u9488\u5bf9\u5f53\u524d\u64cd\u4f5c\u7684\u884c\u8bb0\u5f55\u8fdb\u884c\u52a0\u9501\u3002 \u884c\u7ea7\u9501\u80fd\u5927\u5927\u51cf\u5c11\u6570\u636e\u5e93\u64cd\u4f5c\u7684\u51b2\u7a81\u3002\u5176\u52a0\u9501\u7c92\u5ea6\u6700\u5c0f\uff0c\u5e76\u53d1\u5ea6\u9ad8\uff0c\u4f46\u52a0\u9501\u7684\u5f00\u9500\u4e5f\u6700\u5927\uff0c\u52a0\u9501\u6162\uff0c\u4f1a\u51fa\u73b0\u6b7b\u9501\u3002\u884c\u7ea7\u9501\u548c\u5b58\u50a8\u5f15\u64ce\u6709\u5173\uff0c\u662f\u5728\u5b58\u50a8\u5f15\u64ce\u5c42\u9762\u5b9e\u73b0\u7684\u3002<\/li>\n<\/ul>\n<h4>\u884c\u9501\u5206\u7c7b<\/h4>\n<p>InnoDB \u884c\u9501\u662f\u901a\u8fc7\u5bf9\u7d22\u5f15\u6570\u636e\u9875\u4e0a\u7684\u8bb0\u5f55\u52a0\u9501\u5b9e\u73b0\u7684\uff0cMySQL InnoDB \u652f\u6301\u4e09\u79cd\u884c\u9501\u5b9a\u65b9\u5f0f\uff1a<\/p>\n<ul>\n<li><strong>\u8bb0\u5f55\u9501\uff08Record Lock\uff09<\/strong>\uff1a\u5c5e\u4e8e\u5355\u4e2a\u884c\u8bb0\u5f55\u4e0a\u7684\u9501\u3002<\/li>\n<li><strong>\u95f4\u9699\u9501\uff08Gap Lock\uff09<\/strong>\uff1a\u9501\u5b9a\u4e00\u4e2a\u8303\u56f4\uff0c\u4e0d\u5305\u62ec\u8bb0\u5f55\u672c\u8eab\u3002<\/li>\n<li><strong>\u4e34\u952e\u9501\uff08Next-Key Lock\uff09<\/strong>\uff1aRecord Lock+Gap Lock\uff0c\u9501\u5b9a\u4e00\u4e2a\u8303\u56f4\uff0c\u5305\u542b\u8bb0\u5f55\u672c\u8eab\uff0c\u4e3b\u8981\u76ee\u7684\u662f\u4e3a\u4e86\u89e3\u51b3\u5e7b\u8bfb\u95ee\u9898\uff08MySQL \u4e8b\u52a1\u90e8\u5206\u63d0\u5230\u8fc7\uff09\u3002\u8bb0\u5f55\u9501\u53ea\u80fd\u9501\u4f4f\u5df2\u7ecf\u5b58\u5728\u7684\u8bb0\u5f55\uff0c\u4e3a\u4e86\u907f\u514d\u63d2\u5165\u65b0\u8bb0\u5f55\uff0c\u9700\u8981\u4f9d\u8d56\u95f4\u9699\u9501\u3002<\/li>\n<\/ul>\n<p><strong>\u5728 InnoDB \u9ed8\u8ba4\u7684\u9694\u79bb\u7ea7\u522b REPEATABLE-READ \u4e0b\uff0c\u884c\u9501\u9ed8\u8ba4\u4f7f\u7528\u7684\u662f Next-Key Lock\u3002\u4f46\u662f\uff0c\u5982\u679c\u64cd\u4f5c\u7684\u7d22\u5f15\u662f\u552f\u4e00\u7d22\u5f15\u6216\u4e3b\u952e\uff0cInnoDB \u4f1a\u5bf9 Next-Key Lock \u8fdb\u884c\u4f18\u5316\uff0c\u5c06\u5176\u964d\u7ea7\u4e3a Record Lock\uff0c\u5373\u4ec5\u9501\u4f4f\u7d22\u5f15\u672c\u8eab\uff0c\u800c\u4e0d\u662f\u8303\u56f4\u3002<\/strong><\/p>\n<p>\u4e00\u4e9b\u5927\u5382\u9762\u8bd5\u4e2d\u53ef\u80fd\u4f1a\u95ee\u5230 Next-Key Lock \u7684\u52a0\u9501\u8303\u56f4\uff0c\u8fd9\u91cc\u63a8\u8350\u4e00\u7bc7\u6587\u7ae0\uff1a<a href=\"https:\/\/segmentfault.com\/a\/1190000040129107\" target=\"_blank\" rel=\"noopener noreferrer\">MySQL next-key lock \u52a0\u9501\u8303\u56f4\u662f\u4ec0\u4e48\uff1f &#8211; \u7a0b\u5e8f\u5458\u5c0f\u822a &#8211; 2021<\/a> \u3002<\/p>\n<h4>\u5171\u4eab\u9501\u548c\u6392\u4ed6\u9501<\/h4>\n<p>\u4e0d\u8bba\u662f\u8868\u7ea7\u9501\u8fd8\u662f\u884c\u7ea7\u9501\uff0c\u90fd\u5b58\u5728\u5171\u4eab\u9501\uff08Share Lock\uff0cS \u9501\uff09\u548c\u6392\u4ed6\u9501\uff08Exclusive Lock\uff0cX \u9501\uff09\u8fd9\u4e24\u7c7b\uff1a<\/p>\n<ul>\n<li><strong>\u5171\u4eab\u9501\uff08S \u9501\uff09<\/strong>\uff1a\u53c8\u79f0\u8bfb\u9501\uff0c\u4e8b\u52a1\u5728\u8bfb\u53d6\u8bb0\u5f55\u7684\u65f6\u5019\u83b7\u53d6\u5171\u4eab\u9501\uff0c\u5141\u8bb8\u591a\u4e2a\u4e8b\u52a1\u540c\u65f6\u83b7\u53d6\uff08\u9501\u517c\u5bb9\uff09\u3002<\/li>\n<li><strong>\u6392\u4ed6\u9501\uff08X \u9501\uff09<\/strong>\uff1a\u53c8\u79f0\u5199\u9501\/\u72ec\u5360\u9501\uff0c\u4e8b\u52a1\u5728\u4fee\u6539\u8bb0\u5f55\u7684\u65f6\u5019\u83b7\u53d6\u6392\u4ed6\u9501\uff0c\u4e0d\u5141\u8bb8\u591a\u4e2a\u4e8b\u52a1\u540c\u65f6\u83b7\u53d6\u3002\u5982\u679c\u4e00\u4e2a\u8bb0\u5f55\u5df2\u7ecf\u88ab\u52a0\u4e86\u6392\u4ed6\u9501\uff0c\u90a3\u5176\u4ed6\u4e8b\u52a1\u4e0d\u80fd\u518d\u5bf9\u8fd9\u6761\u4e8b\u52a1\u52a0\u4efb\u4f55\u7c7b\u578b\u7684\u9501\uff08\u9501\u4e0d\u517c\u5bb9\uff09\u3002<\/li>\n<\/ul>\n<p>\u6392\u4ed6\u9501\u4e0e\u4efb\u4f55\u7684\u9501\u90fd\u4e0d\u517c\u5bb9\uff0c\u5171\u4eab\u9501\u4ec5\u548c\u5171\u4eab\u9501\u517c\u5bb9\u3002<\/p>\n<table>\n<thead>\n<tr>\n<th align=\"left\"> <\/th>\n<th align=\"left\">S \u9501<\/th>\n<th align=\"left\">X \u9501<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td align=\"left\">S \u9501<\/td>\n<td align=\"left\">\u4e0d\u51b2\u7a81<\/td>\n<td align=\"left\">\u51b2\u7a81<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">X \u9501<\/td>\n<td align=\"left\">\u51b2\u7a81<\/td>\n<td align=\"left\">\u51b2\u7a81<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u7531\u4e8e MVCC \u7684\u5b58\u5728\uff0c\u5bf9\u4e8e\u4e00\u822c\u7684 <code>SELECT<\/code> \u8bed\u53e5\uff0cInnoDB \u4e0d\u4f1a\u52a0\u4efb\u4f55\u9501\u3002\u4e0d\u8fc7\uff0c \u4f60\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u8bed\u53e5\u663e\u5f0f\u52a0\u5171\u4eab\u9501\u6216\u6392\u4ed6\u9501\u3002<\/p>\n<pre><code class=\"sql\"># \u5171\u4eab\u9501 \u53ef\u4ee5\u5728 MySQL 5.7 \u548c MySQL 8.0 \u4e2d\u4f7f\u7528\nSELECT ... LOCK IN SHARE MODE;\n# \u5171\u4eab\u9501 \u53ef\u4ee5\u5728 MySQL 8.0 \u4e2d\u4f7f\u7528\nSELECT ... FOR SHARE;\n# \u6392\u4ed6\u9501\nSELECT ... FOR UPDATE;<\/code><\/pre>\n<h4>\u610f\u5411\u9501<\/h4>\n<p>\u5982\u679c\u9700\u8981\u7528\u5230\u8868\u9501\u7684\u8bdd\uff0c\u5982\u4f55\u5224\u65ad\u8868\u4e2d\u7684\u8bb0\u5f55\u6ca1\u6709\u884c\u9501\u5462\uff0c\u4e00\u884c\u4e00\u884c\u904d\u5386\u80af\u5b9a\u662f\u4e0d\u884c\uff0c\u6027\u80fd\u592a\u5dee\u3002\u6211\u4eec\u9700\u8981\u7528\u5230\u4e00\u4e2a\u53eb\u505a\u610f\u5411\u9501\u7684\u4e1c\u4e1c\u6765\u5feb\u901f\u5224\u65ad\u662f\u5426\u53ef\u4ee5\u5bf9\u67d0\u4e2a\u8868\u4f7f\u7528\u8868\u9501\u3002<\/p>\n<p>\u610f\u5411\u9501\u662f\u8868\u7ea7\u9501\uff0c\u5171\u6709\u4e24\u79cd\uff1a<\/p>\n<ul>\n<li><strong>\u610f\u5411\u5171\u4eab\u9501\uff08Intention Shared Lock\uff0cIS \u9501\uff09<\/strong>\uff1a\u4e8b\u52a1\u6709\u610f\u5411\u5bf9\u8868\u4e2d\u7684\u67d0\u4e9b\u8bb0\u5f55\u52a0\u5171\u4eab\u9501\uff08S \u9501\uff09\uff0c\u52a0\u5171\u4eab\u9501\u524d\u5fc5\u987b\u5148\u53d6\u5f97\u8be5\u8868\u7684 IS \u9501\u3002<\/li>\n<li><strong>\u610f\u5411\u6392\u4ed6\u9501\uff08Intention Exclusive Lock\uff0cIX \u9501\uff09<\/strong>\uff1a\u4e8b\u52a1\u6709\u610f\u5411\u5bf9\u8868\u4e2d\u7684\u67d0\u4e9b\u8bb0\u5f55\u52a0\u6392\u4ed6\u9501\uff08X \u9501\uff09\uff0c\u52a0\u6392\u4ed6\u9501\u4e4b\u524d\u5fc5\u987b\u5148\u53d6\u5f97\u8be5\u8868\u7684 IX \u9501\u3002<\/li>\n<\/ul>\n<p><strong>\u610f\u5411\u9501\u662f\u7531\u6570\u636e\u5f15\u64ce\u81ea\u5df1\u7ef4\u62a4\u7684\uff0c\u7528\u6237\u65e0\u6cd5\u624b\u52a8\u64cd\u4f5c\u610f\u5411\u9501\uff0c\u5728\u4e3a\u6570\u636e\u884c\u52a0\u5171\u4eab\/\u6392\u4ed6\u9501\u4e4b\u524d\uff0cInnoDB \u4f1a\u5148\u83b7\u53d6\u8be5\u6570\u636e\u884c\u6240\u5728\u5728\u6570\u636e\u8868\u7684\u5bf9\u5e94\u610f\u5411\u9501\u3002<\/strong><\/p>\n<p>\u610f\u5411\u9501\u4e4b\u95f4\u662f\u4e92\u76f8\u517c\u5bb9\u7684\u3002<\/p>\n<table>\n<thead>\n<tr>\n<th> <\/th>\n<th>IS \u9501<\/th>\n<th>IX \u9501<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>IS \u9501<\/td>\n<td>\u517c\u5bb9<\/td>\n<td>\u517c\u5bb9<\/td>\n<\/tr>\n<tr>\n<td>IX \u9501<\/td>\n<td>\u517c\u5bb9<\/td>\n<td>\u517c\u5bb9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u610f\u5411\u9501\u548c\u5171\u4eab\u9501\u548c\u6392\u5b83\u9501\u4e92\u65a5\uff08\u8fd9\u91cc\u6307\u7684\u662f\u8868\u7ea7\u522b\u7684\u5171\u4eab\u9501\u548c\u6392\u4ed6\u9501\uff0c\u610f\u5411\u9501\u4e0d\u4f1a\u4e0e\u884c\u7ea7\u7684\u5171\u4eab\u9501\u548c\u6392\u4ed6\u9501\u4e92\u65a5\uff09\u3002<\/p>\n<table>\n<thead>\n<tr>\n<th> <\/th>\n<th>IS \u9501<\/th>\n<th>IX \u9501<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>S \u9501<\/td>\n<td>\u517c\u5bb9<\/td>\n<td>\u4e92\u65a5<\/td>\n<\/tr>\n<tr>\n<td>X \u9501<\/td>\n<td>\u4e92\u65a5<\/td>\n<td>\u4e92\u65a5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u300aMySQL \u6280\u672f\u5185\u5e55 InnoDB \u5b58\u50a8\u5f15\u64ce\u300b\u8fd9\u672c\u4e66\u5bf9\u5e94\u7684\u63cf\u8ff0\u5e94\u8be5\u662f\u7b14\u8bef\u4e86\u3002<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000045602343\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<h3>7\u3001\u4ecb\u7ecd\u4e00\u4e0b\u6570\u636e\u5e93\u4e8b\u52a1<\/h3>\n<p>\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u5728\u8c08\u8bba\u4e8b\u52a1\u7684\u65f6\u5019\uff0c\u5982\u679c\u6ca1\u6709\u7279\u6307<strong>\u5206\u5e03\u5f0f\u4e8b\u52a1<\/strong>\uff0c\u5f80\u5f80\u6307\u7684\u5c31\u662f<strong>\u6570\u636e\u5e93\u4e8b\u52a1<\/strong>\u3002<\/p>\n<p>\u6570\u636e\u5e93\u4e8b\u52a1\u5728\u6211\u4eec\u65e5\u5e38\u5f00\u53d1\u4e2d\u63a5\u89e6\u7684\u6700\u591a\u4e86\u3002\u5982\u679c\u4f60\u7684\u9879\u76ee\u5c5e\u4e8e\u5355\u4f53\u67b6\u6784\u7684\u8bdd\uff0c\u4f60\u63a5\u89e6\u5230\u7684\u5f80\u5f80\u5c31\u662f\u6570\u636e\u5e93\u4e8b\u52a1\u4e86\u3002<\/p>\n<p><strong>\u90a3\u6570\u636e\u5e93\u4e8b\u52a1\u6709\u4ec0\u4e48\u4f5c\u7528\u5462\uff1f<\/strong><\/p>\n<p>\u7b80\u5355\u6765\u8bf4\uff0c\u6570\u636e\u5e93\u4e8b\u52a1\u53ef\u4ee5\u4fdd\u8bc1\u591a\u4e2a\u5bf9\u6570\u636e\u5e93\u7684\u64cd\u4f5c\uff08\u4e5f\u5c31\u662f SQL \u8bed\u53e5\uff09\u6784\u6210\u4e00\u4e2a\u903b\u8f91\u4e0a\u7684\u6574\u4f53\u3002\u6784\u6210\u8fd9\u4e2a\u903b\u8f91\u4e0a\u7684\u6574\u4f53\u7684\u8fd9\u4e9b\u6570\u636e\u5e93\u64cd\u4f5c\u9075\u5faa\uff1a<strong>\u8981\u4e48\u5168\u90e8\u6267\u884c\u6210\u529f,\u8981\u4e48\u5168\u90e8\u4e0d\u6267\u884c<\/strong> \u3002<\/p>\n<pre><code class=\"sql\"># \u5f00\u542f\u4e00\u4e2a\u4e8b\u52a1\nSTART TRANSACTION;\n# \u591a\u6761 SQL \u8bed\u53e5\nSQL1,SQL2...\n## \u63d0\u4ea4\u4e8b\u52a1\nCOMMIT;<\/code><\/pre>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000045602344\" alt=\"\u6570\u636e\u5e93\u4e8b\u52a1\u793a\u610f\u56fe\" title=\"\u6570\u636e\u5e93\u4e8b\u52a1\u793a\u610f\u56fe\" loading=\"lazy\"><\/p>\n<p>\u53e6\u5916\uff0c\u5173\u7cfb\u578b\u6570\u636e\u5e93\uff08\u4f8b\u5982\uff1a<code>MySQL<\/code>\u3001<code>SQL Server<\/code>\u3001<code>Oracle<\/code> \u7b49\uff09\u4e8b\u52a1\u90fd\u6709 <strong>ACID<\/strong> \u7279\u6027\uff1a<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000045602345\" alt=\"ACID\" title=\"ACID\" loading=\"lazy\"><\/p>\n<ol>\n<li><strong>\u539f\u5b50\u6027<\/strong>\uff08<code>Atomicity<\/code>\uff09\uff1a\u4e8b\u52a1\u662f\u6700\u5c0f\u7684\u6267\u884c\u5355\u4f4d\uff0c\u4e0d\u5141\u8bb8\u5206\u5272\u3002\u4e8b\u52a1\u7684\u539f\u5b50\u6027\u786e\u4fdd\u52a8\u4f5c\u8981\u4e48\u5168\u90e8\u5b8c\u6210\uff0c\u8981\u4e48\u5b8c\u5168\u4e0d\u8d77\u4f5c\u7528\uff1b<\/li>\n<li><strong>\u4e00\u81f4\u6027<\/strong>\uff08<code>Consistency<\/code>\uff09\uff1a\u6267\u884c\u4e8b\u52a1\u524d\u540e\uff0c\u6570\u636e\u4fdd\u6301\u4e00\u81f4\uff0c\u4f8b\u5982\u8f6c\u8d26\u4e1a\u52a1\u4e2d\uff0c\u65e0\u8bba\u4e8b\u52a1\u662f\u5426\u6210\u529f\uff0c\u8f6c\u8d26\u8005\u548c\u6536\u6b3e\u4eba\u7684\u603b\u989d\u5e94\u8be5\u662f\u4e0d\u53d8\u7684\uff1b<\/li>\n<li><strong>\u9694\u79bb\u6027<\/strong>\uff08<code>Isolation<\/code>\uff09\uff1a\u5e76\u53d1\u8bbf\u95ee\u6570\u636e\u5e93\u65f6\uff0c\u4e00\u4e2a\u7528\u6237\u7684\u4e8b\u52a1\u4e0d\u88ab\u5176\u4ed6\u4e8b\u52a1\u6240\u5e72\u6270\uff0c\u5404\u5e76\u53d1\u4e8b\u52a1\u4e4b\u95f4\u6570\u636e\u5e93\u662f\u72ec\u7acb\u7684\uff1b<\/li>\n<li><strong>\u6301\u4e45\u6027<\/strong>\uff08<code>Durability<\/code>\uff09\uff1a\u4e00\u4e2a\u4e8b\u52a1\u88ab\u63d0\u4ea4\u4e4b\u540e\u3002\u5b83\u5bf9\u6570\u636e\u5e93\u4e2d\u6570\u636e\u7684\u6539\u53d8\u662f\u6301\u4e45\u7684\uff0c\u5373\u4f7f\u6570\u636e\u5e93\u53d1\u751f\u6545\u969c\u4e5f\u4e0d\u5e94\u8be5\u5bf9\u5176\u6709\u4efb\u4f55\u5f71\u54cd\u3002<\/li>\n<\/ol>\n<p>\ud83c\udf08 \u8fd9\u91cc\u8981\u989d\u5916\u8865\u5145\u4e00\u70b9\uff1a<strong>\u53ea\u6709\u4fdd\u8bc1\u4e86\u4e8b\u52a1\u7684\u6301\u4e45\u6027\u3001\u539f\u5b50\u6027\u3001\u9694\u79bb\u6027\u4e4b\u540e\uff0c\u4e00\u81f4\u6027\u624d\u80fd\u5f97\u5230\u4fdd\u969c\u3002\u4e5f\u5c31\u662f\u8bf4 A\u3001I\u3001D \u662f\u624b\u6bb5\uff0cC \u662f\u76ee\u7684\uff01<\/strong> \u60f3\u5fc5\u5927\u5bb6\u4e5f\u548c\u6211\u4e00\u6837\uff0c\u88ab ACID \u8fd9\u4e2a\u6982\u5ff5\u88ab\u8bef\u5bfc\u4e86\u5f88\u4e45! \u6211\u4e5f\u662f\u770b\u5468\u5fd7\u660e\u8001\u5e08\u7684\u516c\u5f00\u8bfe<a href=\"https:\/\/link.segmentfault.com\/?enc=jRhZfLavhV0vx8Pp6f9pGg%3D%3D.kA%2FyMLK3Li%2Fe1JYPZE6UxwmqhGQIb8eEu8EBpt4TKRN46v%2FcyzeDQ%2B%2FzEYx2hWhSV0rwwKQxaWCWMqeuDSF1nA%3D%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">\u300a\u5468\u5fd7\u660e\u7684\u8f6f\u4ef6\u67b6\u6784\u8bfe\u300b<\/a>\u624d\u641e\u6e05\u695a\u7684\uff08\u591a\u770b\u597d\u4e66\uff01\uff01\uff01\uff09\u3002<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000045602346\" alt=\"AID-&amp;gt;C\" title=\"AID-&amp;gt;C\" loading=\"lazy\"><\/p>\n<p>\u53e6\u5916\uff0cDDIA \u4e5f\u5c31\u662f <a href=\"https:\/\/link.segmentfault.com\/?enc=IoY%2FK1814QBX0sPw4J%2Bv%2BA%3D%3D.jI4m61NM1IsvZhgM5xpMfO55KHbBdLIElAAR1NghUmtGIcCZftnLKPr77YGZZgI2\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">\u300aDesigning Data-Intensive Application\uff08\u6570\u636e\u5bc6\u96c6\u578b\u5e94\u7528\u7cfb\u7edf\u8bbe\u8ba1\uff09\u300b<\/a> \u7684\u4f5c\u8005\u5728\u4ed6\u7684\u8fd9\u672c\u4e66\u4e2d\u5982\u662f\u8bf4\uff1a<\/p>\n<blockquote>\n<p>Atomicity, isolation, and durability are properties of the database, whereas consis\u2010<br \/>tency (in the ACID sense) is a property of the application. The application may rely<br \/>on the database\u2019s atomicity and isolation properties in order to achieve consistency,<br \/>but it\u2019s not up to the database alone.<\/p>\n<p>\u7ffb\u8bd1\u8fc7\u6765\u7684\u610f\u601d\u662f\uff1a\u539f\u5b50\u6027\uff0c\u9694\u79bb\u6027\u548c\u6301\u4e45\u6027\u662f\u6570\u636e\u5e93\u7684\u5c5e\u6027\uff0c\u800c\u4e00\u81f4\u6027\uff08\u5728 ACID \u610f\u4e49\u4e0a\uff09\u662f\u5e94\u7528\u7a0b\u5e8f\u7684\u5c5e\u6027\u3002\u5e94\u7528\u53ef\u80fd\u4f9d\u8d56\u6570\u636e\u5e93\u7684\u539f\u5b50\u6027\u548c\u9694\u79bb\u5c5e\u6027\u6765\u5b9e\u73b0\u4e00\u81f4\u6027\uff0c\u4f46\u8fd9\u5e76\u4e0d\u4ec5\u53d6\u51b3\u4e8e\u6570\u636e\u5e93\u3002\u56e0\u6b64\uff0c\u5b57\u6bcd C \u4e0d\u5c5e\u4e8e ACID \u3002<\/p>\n<\/blockquote>\n<p>\u300aDesigning Data-Intensive Application\uff08\u6570\u636e\u5bc6\u96c6\u578b\u5e94\u7528\u7cfb\u7edf\u8bbe\u8ba1\uff09\u300b\u8fd9\u672c\u4e66\u5f3a\u63a8\u4e00\u6ce2\uff0c\u503c\u5f97\u8bfb\u5f88\u591a\u904d\uff01\u8c46\u74e3\u6709\u63a5\u8fd1 90% \u7684\u4eba\u770b\u4e86\u8fd9\u672c\u4e66\u4e4b\u540e\u7ed9\u4e86\u4e94\u661f\u597d\u8bc4\u3002\u53e6\u5916\uff0c\u4e2d\u6587\u7ffb\u8bd1\u7248\u672c\u5df2\u7ecf\u5728 GitHub \u5f00\u6e90\uff0c\u5730\u5740\uff1a<a href=\"https:\/\/link.segmentfault.com\/?enc=TWFCxfkfaRDN54aZ%2B%2BRrDQ%3D%3D.KknCrydECDuM3f1dnDSxMavOgmM0JwSvRB9p2OTrLLs%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">https:\/\/github.com\/Vonng\/ddia<\/a> \u3002<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000045602347\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<h3>8\u3001\u6570\u636e\u5e93\u9694\u79bb\u7ea7\u522b\u4e0e\u9501\u5b9e\u73b0<\/h3>\n<p>SQL \u6807\u51c6\u5b9a\u4e49\u4e86\u56db\u4e2a\u9694\u79bb\u7ea7\u522b\uff1a<\/p>\n<ul>\n<li><strong>READ-UNCOMMITTED(\u8bfb\u53d6\u672a\u63d0\u4ea4)<\/strong> \uff1a\u6700\u4f4e\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u5141\u8bb8\u8bfb\u53d6\u5c1a\u672a\u63d0\u4ea4\u7684\u6570\u636e\u53d8\u66f4\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u810f\u8bfb\u3001\u5e7b\u8bfb\u6216\u4e0d\u53ef\u91cd\u590d\u8bfb\u3002<\/li>\n<li><strong>READ-COMMITTED(\u8bfb\u53d6\u5df2\u63d0\u4ea4)<\/strong> \uff1a\u5141\u8bb8\u8bfb\u53d6\u5e76\u53d1\u4e8b\u52a1\u5df2\u7ecf\u63d0\u4ea4\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u963b\u6b62\u810f\u8bfb\uff0c\u4f46\u662f\u5e7b\u8bfb\u6216\u4e0d\u53ef\u91cd\u590d\u8bfb\u4ecd\u6709\u53ef\u80fd\u53d1\u751f\u3002<\/li>\n<li><strong>REPEATABLE-READ(\u53ef\u91cd\u590d\u8bfb)<\/strong> \uff1a\u5bf9\u540c\u4e00\u5b57\u6bb5\u7684\u591a\u6b21\u8bfb\u53d6\u7ed3\u679c\u90fd\u662f\u4e00\u81f4\u7684\uff0c\u9664\u975e\u6570\u636e\u662f\u88ab\u672c\u8eab\u4e8b\u52a1\u81ea\u5df1\u6240\u4fee\u6539\uff0c\u53ef\u4ee5\u963b\u6b62\u810f\u8bfb\u548c\u4e0d\u53ef\u91cd\u590d\u8bfb\uff0c\u4f46\u5e7b\u8bfb\u4ecd\u6709\u53ef\u80fd\u53d1\u751f\u3002<\/li>\n<li><strong>SERIALIZABLE(\u53ef\u4e32\u884c\u5316)<\/strong> \uff1a\u6700\u9ad8\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u5b8c\u5168\u670d\u4ece ACID \u7684\u9694\u79bb\u7ea7\u522b\u3002\u6240\u6709\u7684\u4e8b\u52a1\u4f9d\u6b21\u9010\u4e2a\u6267\u884c\uff0c\u8fd9\u6837\u4e8b\u52a1\u4e4b\u95f4\u5c31\u5b8c\u5168\u4e0d\u53ef\u80fd\u4ea7\u751f\u5e72\u6270\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u8be5\u7ea7\u522b\u53ef\u4ee5\u9632\u6b62\u810f\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\u4ee5\u53ca\u5e7b\u8bfb\u3002<\/li>\n<\/ul>\n<hr>\n<table>\n<thead>\n<tr>\n<th align=\"center\">\u9694\u79bb\u7ea7\u522b<\/th>\n<th align=\"center\">\u810f\u8bfb<\/th>\n<th align=\"center\">\u4e0d\u53ef\u91cd\u590d\u8bfb<\/th>\n<th align=\"center\">\u5e7b\u8bfb<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td align=\"center\">READ-UNCOMMITTED<\/td>\n<td align=\"center\">\u221a<\/td>\n<td align=\"center\">\u221a<\/td>\n<td align=\"center\">\u221a<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">READ-COMMITTED<\/td>\n<td align=\"center\">\u00d7<\/td>\n<td align=\"center\">\u221a<\/td>\n<td align=\"center\">\u221a<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">REPEATABLE-READ<\/td>\n<td align=\"center\">\u00d7<\/td>\n<td align=\"center\">\u00d7<\/td>\n<td align=\"center\">\u221a<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">SERIALIZABLE<\/td>\n<td align=\"center\">\u00d7<\/td>\n<td align=\"center\">\u00d7<\/td>\n<td align=\"center\">\u00d7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>MySQL InnoDB \u5b58\u50a8\u5f15\u64ce\u7684\u9ed8\u8ba4\u652f\u6301\u7684\u9694\u79bb\u7ea7\u522b\u662f <strong>REPEATABLE-READ\uff08\u53ef\u91cd\u8bfb\uff09<\/strong>\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7<code>SELECT @@tx_isolation;<\/code>\u547d\u4ee4\u6765\u67e5\u770b\uff0cMySQL 8.0 \u8be5\u547d\u4ee4\u6539\u4e3a<code>SELECT @@transaction_isolation;<\/code><\/p>\n<pre><code class=\"sql\">mysql&gt; SELECT @@tx_isolation;\n+-----------------+\n| @@tx_isolation  |\n+-----------------+\n| REPEATABLE-READ |\n+-----------------+<\/code><\/pre>\n<p>\u4ece\u4e0a\u9762\u5bf9 SQL \u6807\u51c6\u5b9a\u4e49\u4e86\u56db\u4e2a\u9694\u79bb\u7ea7\u522b\u7684\u4ecb\u7ecd\u53ef\u4ee5\u770b\u51fa\uff0c\u6807\u51c6\u7684 SQL \u9694\u79bb\u7ea7\u522b\u5b9a\u4e49\u91cc\uff0cREPEATABLE-READ(\u53ef\u91cd\u590d\u8bfb)\u662f\u4e0d\u53ef\u4ee5\u9632\u6b62\u5e7b\u8bfb\u7684\u3002<\/p>\n<p>\u4f46\u662f\uff01InnoDB \u5b9e\u73b0\u7684 REPEATABLE-READ \u9694\u79bb\u7ea7\u522b\u5176\u5b9e\u662f\u53ef\u4ee5\u89e3\u51b3\u5e7b\u8bfb\u95ee\u9898\u53d1\u751f\u7684\uff0c\u4e3b\u8981\u6709\u4e0b\u9762\u4e24\u79cd\u60c5\u51b5\uff1a<\/p>\n<ul>\n<li><strong>\u5feb\u7167\u8bfb<\/strong>\uff1a\u7531 MVCC \u673a\u5236\u6765\u4fdd\u8bc1\u4e0d\u51fa\u73b0\u5e7b\u8bfb\u3002<\/li>\n<li><strong>\u5f53\u524d\u8bfb<\/strong>\uff1a\u4f7f\u7528 Next-Key Lock \u8fdb\u884c\u52a0\u9501\u6765\u4fdd\u8bc1\u4e0d\u51fa\u73b0\u5e7b\u8bfb\uff0cNext-Key Lock \u662f\u884c\u9501\uff08Record Lock\uff09\u548c\u95f4\u9699\u9501\uff08Gap Lock\uff09\u7684\u7ed3\u5408\uff0c\u884c\u9501\u53ea\u80fd\u9501\u4f4f\u5df2\u7ecf\u5b58\u5728\u7684\u884c\uff0c\u4e3a\u4e86\u907f\u514d\u63d2\u5165\u65b0\u884c\uff0c\u9700\u8981\u4f9d\u8d56\u95f4\u9699\u9501\u3002<\/li>\n<\/ul>\n<p>\u56e0\u4e3a\u9694\u79bb\u7ea7\u522b\u8d8a\u4f4e\uff0c\u4e8b\u52a1\u8bf7\u6c42\u7684\u9501\u8d8a\u5c11\uff0c\u6240\u4ee5\u5927\u90e8\u5206\u6570\u636e\u5e93\u7cfb\u7edf\u7684\u9694\u79bb\u7ea7\u522b\u90fd\u662f <strong>READ-COMMITTED<\/strong> \uff0c\u4f46\u662f\u4f60\u8981\u77e5\u9053\u7684\u662f InnoDB \u5b58\u50a8\u5f15\u64ce\u9ed8\u8ba4\u4f7f\u7528 <strong>REPEATABLE-READ<\/strong> \u5e76\u4e0d\u4f1a\u6709\u4efb\u4f55\u6027\u80fd\u635f\u5931\u3002<\/p>\n<p>InnoDB \u5b58\u50a8\u5f15\u64ce\u5728\u5206\u5e03\u5f0f\u4e8b\u52a1\u7684\u60c5\u51b5\u4e0b\u4e00\u822c\u4f1a\u7528\u5230 SERIALIZABLE \u9694\u79bb\u7ea7\u522b\u3002<\/p>\n<p>\u300aMySQL \u6280\u672f\u5185\u5e55\uff1aInnoDB \u5b58\u50a8\u5f15\u64ce(\u7b2c 2 \u7248)\u300b7.7 \u7ae0\u8fd9\u6837\u5199\u5230\uff1a<\/p>\n<blockquote><p>InnoDB \u5b58\u50a8\u5f15\u64ce\u63d0\u4f9b\u4e86\u5bf9 XA \u4e8b\u52a1\u7684\u652f\u6301\uff0c\u5e76\u901a\u8fc7 XA \u4e8b\u52a1\u6765\u652f\u6301\u5206\u5e03\u5f0f\u4e8b\u52a1\u7684\u5b9e\u73b0\u3002\u5206\u5e03\u5f0f\u4e8b\u52a1\u6307\u7684\u662f\u5141\u8bb8\u591a\u4e2a\u72ec\u7acb\u7684\u4e8b\u52a1\u8d44\u6e90\uff08transactional resources\uff09\u53c2\u4e0e\u5230\u4e00\u4e2a\u5168\u5c40\u7684\u4e8b\u52a1\u4e2d\u3002\u4e8b\u52a1\u8d44\u6e90\u901a\u5e38\u662f\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7cfb\u7edf\uff0c\u4f46\u4e5f\u53ef\u4ee5\u662f\u5176\u4ed6\u7c7b\u578b\u7684\u8d44\u6e90\u3002\u5168\u5c40\u4e8b\u52a1\u8981\u6c42\u5728\u5176\u4e2d\u7684\u6240\u6709\u53c2\u4e0e\u7684\u4e8b\u52a1\u8981\u4e48\u90fd\u63d0\u4ea4\uff0c\u8981\u4e48\u90fd\u56de\u6eda\uff0c\u8fd9\u5bf9\u4e8e\u4e8b\u52a1\u539f\u6709\u7684 ACID \u8981\u6c42\u53c8\u6709\u4e86\u63d0\u9ad8\u3002\u53e6\u5916\uff0c\u5728\u4f7f\u7528\u5206\u5e03\u5f0f\u4e8b\u52a1\u65f6\uff0cInnoDB \u5b58\u50a8\u5f15\u64ce\u7684\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\u5fc5\u987b\u8bbe\u7f6e\u4e3a SERIALIZABLE\u3002<\/p><\/blockquote>\n<p>MySQL \u7684\u9694\u79bb\u7ea7\u522b\u57fa\u4e8e\u9501\u548c MVCC \u673a\u5236\u5171\u540c\u5b9e\u73b0\u7684\u3002<\/p>\n<p>SERIALIZABLE \u9694\u79bb\u7ea7\u522b\u662f\u901a\u8fc7\u9501\u6765\u5b9e\u73b0\u7684\uff0cREAD-COMMITTED \u548c REPEATABLE-READ \u9694\u79bb\u7ea7\u522b\u662f\u57fa\u4e8e MVCC \u5b9e\u73b0\u7684\u3002\u4e0d\u8fc7\uff0c SERIALIZABLE \u4e4b\u5916\u7684\u5176\u4ed6\u9694\u79bb\u7ea7\u522b\u53ef\u80fd\u4e5f\u9700\u8981\u7528\u5230\u9501\u673a\u5236\uff0c\u5c31\u6bd4\u5982 REPEATABLE-READ \u5728\u5f53\u524d\u8bfb\u60c5\u51b5\u4e0b\u9700\u8981\u4f7f\u7528\u52a0\u9501\u8bfb\u6765\u4fdd\u8bc1\u4e0d\u4f1a\u51fa\u73b0\u5e7b\u8bfb\u3002<\/p>\n<p>\u66f4\u591a MySQL \u9762\u8bd5\u9898\uff0c\u8bf7\u9605\u8bfb\u8fd9\u51e0\u7bc7\u6587\u7ae0\uff1a<\/p>\n<ul>\n<li><a href=\"https:\/\/link.segmentfault.com\/?enc=VxzLZNIsxTm4h395clFjUw%3D%3D.%2F6ugAflGQz142Qt25nNJqen%2B%2BkKDEIzpQ%2F0jlBiEQfeznViNBmZreGaXTffzzG1KZ%2FXg9l6TatMMdtdg1x49cA%3D%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">MySQL \u5e38\u89c1\u9762\u8bd5\u9898\u603b\u7ed3<\/a><\/li>\n<li><a href=\"https:\/\/link.segmentfault.com\/?enc=7GuPknuCeezi0R1fH1R%2BMw%3D%3D.iXIAVU8EEFuuEKnmE8DDAiQRebFPjAmcHOFrt%2BpzZVu6yPkFgIQ2quIW%2FIib78%2BgK8cAjDZGLKzB%2BRHYcnMlYg%3D%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">MySQL \u7d22\u5f15\u8be6\u89e3<\/a><\/li>\n<li><a href=\"https:\/\/link.segmentfault.com\/?enc=cSl%2Fq%2BIXdBShN3Afa%2FaDZw%3D%3D.92RVgx7doe77osy5EUOROCE6VFO9P%2BmMGFK0YDtpHfvvQr%2BES0shO7Q3u%2FXAuGpu9HC%2BoTqnZ%2FLNLYcxZzr6Gw%3D%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">MySQL \u4e09\u5927\u65e5\u5fd7(binlog\u3001redo log \u548c undo log)\u8be6\u89e3<\/a><\/li>\n<li><a href=\"https:\/\/link.segmentfault.com\/?enc=n1g3oMtHuhFJUcVuIT2EEA%3D%3D.3YqWuXHKeW%2FI0NIHpImBxmqmYXc%2B7UAmAJl%2FbyTdpzQkbdzb%2FxZcNxG%2BlnuIjzSqh3A52NHQA8VunkcNjwCNfYj5QJwGs7Zi%2FwBj69%2Fs3cY%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">MySQL \u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\u8be6\u89e3<\/a><\/li>\n<li><a href=\"https:\/\/link.segmentfault.com\/?enc=vHbyJQpkZAPJ4D1E0ECX5w%3D%3D.sWkaqVJG2AeTBFh4wxtj%2FE0rAu348m27bEBiWeUXw7HFoasHdylJop941jWWS9ypbgQp16OK8idc4lyQi6Svfv67Rype%2BwOOeCzSMtj3akM%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">InnoDB \u5b58\u50a8\u5f15\u64ce\u5bf9 MVCC \u7684\u5b9e\u73b0<\/a><\/li>\n<li><a href=\"https:\/\/link.segmentfault.com\/?enc=RFBNyj3TT8SXWRDFD4eEWQ%3D%3D.uJDWgX3ozbTFjCJMtNBM9VSjc%2BttA4hOq2%2FQ0%2Fc%2B3bXJsp4auaEMiRaZBihzoZUJAw3blLSFGwC7a%2BQuPnmyj3yRX6JbrM2TsIy6HB7EZJ4%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">SQL \u8bed\u53e5\u5728 MySQL \u4e2d\u7684\u6267\u884c\u8fc7\u7a0b<\/a><\/li>\n<\/ul>\n<h3>9\u3001Redis \u6570\u636e\u7ed3\u6784\uff0c\u7528\u8fc7\u54ea\u4e9b\uff0c\u5e95\u5c42\u6570\u636e\u7ed3\u6784<\/h3>\n<p>Redis \u4e2d\u6bd4\u8f83\u5e38\u89c1\u7684\u6570\u636e\u7c7b\u578b\u6709\u4e0b\u9762\u8fd9\u4e9b\uff1a<\/p>\n<ul>\n<li><strong>5 \u79cd\u57fa\u7840\u6570\u636e\u7c7b\u578b<\/strong>\uff1aString\uff08\u5b57\u7b26\u4e32\uff09\u3001List\uff08\u5217\u8868\uff09\u3001Set\uff08\u96c6\u5408\uff09\u3001Hash\uff08\u6563\u5217\uff09\u3001Zset\uff08\u6709\u5e8f\u96c6\u5408\uff09\u3002<\/li>\n<li><strong>3 \u79cd\u7279\u6b8a\u6570\u636e\u7c7b\u578b<\/strong>\uff1aHyperLogLog\uff08\u57fa\u6570\u7edf\u8ba1\uff09\u3001Bitmap \uff08\u4f4d\u56fe\uff09\u3001Geospatial (\u5730\u7406\u4f4d\u7f6e)\u3002<\/li>\n<\/ul>\n<p>Redis 5 \u79cd\u57fa\u672c\u6570\u636e\u7c7b\u578b\u5176\u5e95\u5c42\u5b9e\u73b0\u4e3b\u8981\u4f9d\u8d56\u8fd9 8 \u79cd\u6570\u636e\u7ed3\u6784\uff1a\u7b80\u5355\u52a8\u6001\u5b57\u7b26\u4e32\uff08SDS\uff09\u3001LinkedList\uff08\u53cc\u5411\u94fe\u8868\uff09\u3001Dict\uff08\u54c8\u5e0c\u8868\/\u5b57\u5178\uff09\u3001SkipList\uff08\u8df3\u8dc3\u8868\uff09\u3001Intset\uff08\u6574\u6570\u96c6\u5408\uff09\u3001ZipList\uff08\u538b\u7f29\u5217\u8868\uff09\u3001QuickList\uff08\u5feb\u901f\u5217\u8868\uff09\u3002<\/p>\n<p>Redis 5 \u79cd\u57fa\u672c\u6570\u636e\u7c7b\u578b\u5bf9\u5e94\u7684\u5e95\u5c42\u6570\u636e\u7ed3\u6784\u5b9e\u73b0\u5982\u4e0b\u8868\u6240\u793a\uff1a<\/p>\n<table>\n<thead>\n<tr>\n<th align=\"left\">String<\/th>\n<th align=\"left\">List<\/th>\n<th align=\"left\">Hash<\/th>\n<th align=\"left\">Set<\/th>\n<th align=\"left\">Zset<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td align=\"left\">SDS<\/td>\n<td align=\"left\">LinkedList\/ZipList\/QuickList<\/td>\n<td align=\"left\">Dict\u3001ZipList<\/td>\n<td align=\"left\">Dict\u3001Intset<\/td>\n<td align=\"left\">ZipList\u3001SkipList<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Redis 3.2 \u4e4b\u524d\uff0cList \u5e95\u5c42\u5b9e\u73b0\u662f LinkedList \u6216\u8005 ZipList\u3002Redis 3.2 \u4e4b\u540e\uff0c\u5f15\u5165\u4e86 LinkedList \u548c ZipList \u7684\u7ed3\u5408 QuickList\uff0cList \u7684\u5e95\u5c42\u5b9e\u73b0\u53d8\u4e3a QuickList\u3002\u4ece Redis 7.0 \u5f00\u59cb\uff0c ZipList \u88ab ListPack \u53d6\u4ee3\u3002<\/p>\n<p>\u9664\u4e86\u4e0a\u9762\u63d0\u5230\u7684\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5176\u4ed6\u7684\u6bd4\u5982 <a href=\"https:\/\/link.segmentfault.com\/?enc=XtA41cx9fUt%2F9p5qWXivaA%3D%3D.tTYIV0Ae8x4v31%2FpwpKEC06gDL243c%2Bu%2Fn13b6ZaC9f4%2B5ZOqJdAOVLV7C4ukinMoAdeD%2ByeK0H1SVMwCpnAHQ%3D%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Bloom filter\uff08\u5e03\u9686\u8fc7\u6ee4\u5668\uff09<\/a>\u3001Bitfield\uff08\u4f4d\u57df\uff09\u3002<\/p>\n<p>\u5173\u4e8e Redis 5 \u79cd\u57fa\u7840\u6570\u636e\u7c7b\u578b\u548c 3 \u79cd\u7279\u6b8a\u6570\u636e\u7c7b\u578b\u7684\u8be6\u7ec6\u4ecb\u7ecd\u8bf7\u770b <a href=\"https:\/\/link.segmentfault.com\/?enc=q8SN0jzutikX7BYxK4H6DQ%3D%3D.EeSrh3TU3DNgFowrlmnio28R9i%2BNdem8NWqUiZEbcsWMv1t2y2fqHumA%2F7K66MCZ\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Redis \u5b98\u65b9\u6587\u6863\u5bf9 Redis \u6570\u636e\u7c7b\u578b\u7684\u4ecb\u7ecd<\/a> \u548c\u6211\u5199\u7684\u8fd9\u7bc7\u6587\u7ae0\uff1a<a href=\"https:\/\/link.segmentfault.com\/?enc=otCdwP2gbSur6mToQUbTcg%3D%3D.mlqYNaNV0XP2LwQpNyFJ%2FNYfpn4ns5sK%2Bvdl0tJmqmC491HAhAtkBjxxTmifl5guY5K%2FiC%2FnOVu8DgPos2j%2BWg%3D%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Redis \u516b\u79cd\u5e38\u7528\u6570\u636e\u7c7b\u578b\u5e38\u7528\u547d\u4ee4\u548c\u5e94\u7528\u573a\u666f<\/a>\u3002<\/p>\n<h3>10\u3001Redis \u5982\u4f55\u4fdd\u8bc1\u539f\u5b50\u6027\uff1f<\/h3>\n<p>Redis \u4ece 2.6 \u7248\u672c\u5f00\u59cb\u652f\u6301\u6267\u884c Lua \u811a\u672c\uff0c\u5b83\u7684\u529f\u80fd\u548c\u4e8b\u52a1\u975e\u5e38\u7c7b\u4f3c\u3002\u6211\u4eec\u53ef\u4ee5\u5229\u7528 Lua \u811a\u672c\u6765\u6279\u91cf\u6267\u884c\u591a\u6761 Redis \u547d\u4ee4\uff0c\u8fd9\u4e9b Redis \u547d\u4ee4\u4f1a\u88ab\u63d0\u4ea4\u5230 Redis \u670d\u52a1\u5668\u4e00\u6b21\u6027\u6267\u884c\u5b8c\u6210\uff0c\u5927\u5e45\u51cf\u5c0f\u4e86\u7f51\u7edc\u5f00\u9500\u3002<\/p>\n<p>\u4e00\u6bb5 Lua \u811a\u672c\u53ef\u4ee5\u89c6\u4f5c\u4e00\u6761\u547d\u4ee4\u6267\u884c\uff0c\u4e00\u6bb5 Lua \u811a\u672c\u6267\u884c\u8fc7\u7a0b\u4e2d\u4e0d\u4f1a\u6709\u5176\u4ed6\u811a\u672c\u6216 Redis \u547d\u4ee4\u540c\u65f6\u6267\u884c\uff0c\u4fdd\u8bc1\u4e86\u64cd\u4f5c\u4e0d\u4f1a\u88ab\u5176\u4ed6\u6307\u4ee4\u63d2\u5165\u6216\u6253\u6270\u3002<\/p>\n<p>\u4e0d\u8fc7\uff0c\u5982\u679c Lua \u811a\u672c\u8fd0\u884c\u65f6\u51fa\u9519\u5e76\u4e2d\u9014\u7ed3\u675f\uff0c\u51fa\u9519\u4e4b\u540e\u7684\u547d\u4ee4\u662f\u4e0d\u4f1a\u88ab\u6267\u884c\u7684\u3002\u5e76\u4e14\uff0c\u51fa\u9519\u4e4b\u524d\u6267\u7684\u547d\u4ee4\u662f\u65e0\u6cd5\u88ab\u64a4\u9500\u7684\uff0c\u65e0\u6cd5\u5b9e\u73b0\u7c7b\u4f3c\u5173\u7cfb\u578b\u6570\u636e\u5e93\u6267\u884c\u5931\u8d25\u53ef\u4ee5\u56de\u6eda\u7684\u90a3\u79cd\u539f\u5b50\u6027\u6548\u679c\u3002\u56e0\u6b64\uff0c <strong>\u4e25\u683c\u6765\u8bf4\u7684\u8bdd\uff0c\u901a\u8fc7 Lua \u811a\u672c\u6765\u6279\u91cf\u6267\u884c Redis \u547d\u4ee4\u5b9e\u9645\u4e5f\u662f\u4e0d\u5b8c\u5168\u6ee1\u8db3\u539f\u5b50\u6027\u7684\u3002<\/strong><\/p>\n<p>\u5982\u679c\u60f3\u8981\u8ba9 Lua \u811a\u672c\u4e2d\u7684\u547d\u4ee4\u5168\u90e8\u6267\u884c\uff0c\u5fc5\u987b\u4fdd\u8bc1\u8bed\u53e5\u8bed\u6cd5\u548c\u547d\u4ee4\u90fd\u662f\u5bf9\u7684\u3002<\/p>\n<p>\u53e6\u5916\uff0cRedis 7.0 \u65b0\u589e\u4e86 <a href=\"https:\/\/link.segmentfault.com\/?enc=OpMOHrdbyhTIF7lEYXHStw%3D%3D.Dg2EhpA6PoGeAYPurBZTjnwkKkLshrvwPUFlA5U8b0rWlFCyxJpU55AZqwlYXVWU8aHGMC0EnaxGFpz6YvwGFw%3D%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Redis functions<\/a> \u7279\u6027\uff0c\u4f60\u53ef\u4ee5\u5c06 Redis functions \u770b\u4f5c\u662f\u6bd4 Lua \u66f4\u5f3a\u5927\u7684\u811a\u672c\u3002<\/p>\n<h3>11\u3001Redis \u5982\u4f55\u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\uff1f<\/h3>\n<p>\u5efa\u8bae\u4f7f\u7528 Reedisson \u5185\u7f6e\u7684\u5206\u5e03\u5f0f\u9501\u3002<\/p>\n<p>Redisson \u662f\u4e00\u4e2a\u5f00\u6e90\u7684 Java \u8bed\u8a00 Redis \u5ba2\u6237\u7aef\uff0c\u63d0\u4f9b\u4e86\u5f88\u591a\u5f00\u7bb1\u5373\u7528\u7684\u529f\u80fd\uff0c\u4e0d\u4ec5\u4ec5\u5305\u62ec\u591a\u79cd\u5206\u5e03\u5f0f\u9501\u7684\u5b9e\u73b0\u3002\u5e76\u4e14\uff0cRedisson \u8fd8\u652f\u6301 Redis \u5355\u673a\u3001Redis Sentinel \u3001Redis Cluster \u7b49\u591a\u79cd\u90e8\u7f72\u67b6\u6784\u3002<\/p>\n<p>Redisson \u4e2d\u7684\u5206\u5e03\u5f0f\u9501\u81ea\u5e26\u81ea\u52a8\u7eed\u671f\u673a\u5236\uff0c\u4f7f\u7528\u8d77\u6765\u975e\u5e38\u7b80\u5355\uff0c\u539f\u7406\u4e5f\u6bd4\u8f83\u7b80\u5355\uff0c\u5176\u63d0\u4f9b\u4e86\u4e00\u4e2a\u4e13\u95e8\u7528\u6765\u76d1\u63a7\u548c\u7eed\u671f\u9501\u7684 <strong>Watch Dog\uff08 \u770b\u95e8\u72d7\uff09<\/strong>\uff0c\u5982\u679c\u64cd\u4f5c\u5171\u4eab\u8d44\u6e90\u7684\u7ebf\u7a0b\u8fd8\u672a\u6267\u884c\u5b8c\u6210\u7684\u8bdd\uff0cWatch Dog \u4f1a\u4e0d\u65ad\u5730\u5ef6\u957f\u9501\u7684\u8fc7\u671f\u65f6\u95f4\uff0c\u8fdb\u800c\u4fdd\u8bc1\u9501\u4e0d\u4f1a\u56e0\u4e3a\u8d85\u65f6\u800c\u88ab\u91ca\u653e\u3002<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000045602348\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u8be6\u7ec6\u4ecb\u7ecd\u53ef\u4ee5\u53c2\u8003\u6211\u5199\u7684\u8fd9\u7bc7\u6587\u7ae0\uff1a<a href=\"https:\/\/link.segmentfault.com\/?enc=rhhDQ8wPVak%2B3YT4pGMUpQ%3D%3D.j50RnXN79s058bzxkpsoARN%2FTRRCx5KXk2TkHfCTyPtcmEWK8bhlD4piFPxB6w8X2TvBhF%2F1cNy8zNboiTWgsCQmkf3PlZ8WecJzzQDDSCo%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">\u5982\u4f55\u57fa\u4e8e Redis \u5b9e\u73b0\u5206\u5e03\u5f0f\u9501\uff1f<\/a>\uff0c\u5199\u7684\u6bd4\u8f83\u8be6\u7ec6\u3002<\/p>\n<p>Redis \u9762\u8bd5\u9898\u603b\u7ed3\uff1a<\/p>\n<ul>\n<li><a href=\"https:\/\/link.segmentfault.com\/?enc=Hi%2BsjJajmz4cw%2FTeVX1dtw%3D%3D.4Kmae%2BhsJ8FM4o2BpljqhYRicQB3jsOkgNHipCVF7eDFfIEUX9%2B5SqPTpPuYT%2BMyqWW4Nbh%2BOmnc3clM%2Ftk9Vw%3D%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Redis \u5e38\u89c1\u9762\u8bd5\u9898\u603b\u7ed3\uff08\u4e0a\uff09<\/a><\/li>\n<li><a href=\"https:\/\/link.segmentfault.com\/?enc=ceKGvMJFNi4CyOiOzsXsOg%3D%3D.7%2FJXO%2FfIjU3OdRjuAspLNdgiwDA%2FFm5Tj5x%2FzDeRpKfuVFZz3YLaX0Aroy3KtGT604oaiPKH95JzCPgXlQznRw%3D%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Redis \u5e38\u89c1\u9762\u8bd5\u9898\u603b\u7ed3\uff08\u4e0b\uff09<\/a><\/li>\n<\/ul>\n<h3>12\u3001Spring \u5faa\u73af\u4f9d\u8d56\u600e\u4e48\u89e3\u51b3<\/h3>\n<p>\u5faa\u73af\u4f9d\u8d56\u662f\u6307 Bean \u5bf9\u8c61\u5faa\u73af\u5f15\u7528\uff0c\u662f\u4e24\u4e2a\u6216\u591a\u4e2a Bean \u4e4b\u95f4\u76f8\u4e92\u6301\u6709\u5bf9\u65b9\u7684\u5f15\u7528\uff0c\u4f8b\u5982 CircularDependencyA \u2192 CircularDependencyB \u2192 CircularDependencyA\u3002<\/p>\n<pre><code class=\"java\">@Component\npublic class CircularDependencyA {\n    @Autowired\n    private CircularDependencyB circB;\n}\n\n@Component\npublic class CircularDependencyB {\n    @Autowired\n    private CircularDependencyA circA;\n}<\/code><\/pre>\n<p>\u5355\u4e2a\u5bf9\u8c61\u7684\u81ea\u6211\u4f9d\u8d56\u4e5f\u4f1a\u51fa\u73b0\u5faa\u73af\u4f9d\u8d56\uff0c\u4f46\u8fd9\u79cd\u6982\u7387\u6781\u4f4e\uff0c\u5c5e\u4e8e\u662f\u4ee3\u7801\u7f16\u5199\u9519\u8bef\u3002<\/p>\n<pre><code class=\"java\">@Component\npublic class CircularDependencyA {\n    @Autowired\n    private CircularDependencyA circA;\n}<\/code><\/pre>\n<p>Spring \u6846\u67b6\u901a\u8fc7\u4f7f\u7528\u4e09\u7ea7\u7f13\u5b58\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u786e\u4fdd\u5373\u4f7f\u5728\u5faa\u73af\u4f9d\u8d56\u7684\u60c5\u51b5\u4e0b\u4e5f\u80fd\u6b63\u786e\u521b\u5efa Bean\u3002<\/p>\n<p>Spring \u4e2d\u7684\u4e09\u7ea7\u7f13\u5b58\u5176\u5b9e\u5c31\u662f\u4e09\u4e2a Map\uff0c\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"java\">\/\/ \u4e00\u7ea7\u7f13\u5b58\n\/** Cache of singleton objects: bean name to bean instance. *\/\nprivate final Map&lt;String, Object&gt; singletonObjects = new ConcurrentHashMap&lt;&gt;(256);\n\n\/\/ \u4e8c\u7ea7\u7f13\u5b58\n\/** Cache of early singleton objects: bean name to bean instance. *\/\nprivate final Map&lt;String, Object&gt; earlySingletonObjects = new HashMap&lt;&gt;(16);\n\n\/\/ \u4e09\u7ea7\u7f13\u5b58\n\/** Cache of singleton factories: bean name to ObjectFactory. *\/\nprivate final Map&lt;String, ObjectFactory&lt;?&gt;&gt; singletonFactories = new HashMap&lt;&gt;(16);<\/code><\/pre>\n<p>\u7b80\u5355\u6765\u8bf4\uff0cSpring \u7684\u4e09\u7ea7\u7f13\u5b58\u5305\u62ec\uff1a<\/p>\n<ol>\n<li><strong>\u4e00\u7ea7\u7f13\u5b58\uff08singletonObjects\uff09<\/strong>\uff1a\u5b58\u653e\u6700\u7ec8\u5f62\u6001\u7684 Bean\uff08\u5df2\u7ecf\u5b9e\u4f8b\u5316\u3001\u5c5e\u6027\u586b\u5145\u3001\u521d\u59cb\u5316\uff09\uff0c\u5355\u4f8b\u6c60\uff0c\u4e3a\u201cSpring \u7684\u5355\u4f8b\u5c5e\u6027\u201d\u2f7d\u2f63\u3002\u4e00\u822c\u60c5\u51b5\u6211\u4eec\u83b7\u53d6 Bean \u90fd\u662f\u4ece\u8fd9\u91cc\u83b7\u53d6\u7684\uff0c\u4f46\u662f\u5e76\u4e0d\u662f\u6240\u6709\u7684 Bean \u90fd\u5728\u5355\u4f8b\u6c60\u91cc\u9762\uff0c\u4f8b\u5982\u539f\u578b Bean \u5c31\u4e0d\u5728\u91cc\u9762\u3002<\/li>\n<li><strong>\u4e8c\u7ea7\u7f13\u5b58\uff08earlySingletonObjects\uff09<\/strong>\uff1a\u5b58\u653e\u8fc7\u6e21 Bean\uff08\u534a\u6210\u54c1\uff0c\u5c1a\u672a\u5c5e\u6027\u586b\u5145\uff09\uff0c\u4e5f\u5c31\u662f\u4e09\u7ea7\u7f13\u5b58\u4e2d<code>ObjectFactory<\/code>\u4ea7\u751f\u7684\u5bf9\u8c61\uff0c\u4e0e\u4e09\u7ea7\u7f13\u5b58\u914d\u5408\u4f7f\u7528\u7684\uff0c\u53ef\u4ee5\u9632\u6b62 AOP \u7684\u60c5\u51b5\u4e0b\uff0c\u6bcf\u6b21\u8c03\u7528<code>ObjectFactory#getObject()<\/code>\u90fd\u662f\u4f1a\u4ea7\u751f\u65b0\u7684\u4ee3\u7406\u5bf9\u8c61\u7684\u3002<\/li>\n<li><strong>\u4e09\u7ea7\u7f13\u5b58\uff08singletonFactories\uff09<\/strong>\uff1a\u5b58\u653e<code>ObjectFactory<\/code>\uff0c<code>ObjectFactory<\/code>\u7684<code>getObject()<\/code>\u65b9\u6cd5\uff08\u6700\u7ec8\u8c03\u7528\u7684\u662f<code>getEarlyBeanReference()<\/code>\u65b9\u6cd5\uff09\u53ef\u4ee5\u751f\u6210\u539f\u59cb Bean \u5bf9\u8c61\u6216\u8005\u4ee3\u7406\u5bf9\u8c61\uff08\u5982\u679c Bean \u88ab AOP \u5207\u9762\u4ee3\u7406\uff09\u3002\u4e09\u7ea7\u7f13\u5b58\u53ea\u4f1a\u5bf9\u5355\u4f8b Bean \u751f\u6548\u3002<\/li>\n<\/ol>\n<p>\u63a5\u4e0b\u6765\u8bf4\u4e00\u4e0b Spring \u521b\u5efa Bean \u7684\u6d41\u7a0b\uff1a<\/p>\n<ol>\n<li>\u5148\u53bb <strong>\u4e00\u7ea7\u7f13\u5b58 <code>singletonObjects<\/code><\/strong> \u4e2d\u83b7\u53d6\uff0c\u5b58\u5728\u5c31\u8fd4\u56de\uff1b<\/li>\n<li>\u5982\u679c\u4e0d\u5b58\u5728\u6216\u8005\u5bf9\u8c61\u6b63\u5728\u521b\u5efa\u4e2d\uff0c\u4e8e\u662f\u53bb <strong>\u4e8c\u7ea7\u7f13\u5b58 <code>earlySingletonObjects<\/code><\/strong> \u4e2d\u83b7\u53d6\uff1b<\/li>\n<li>\u5982\u679c\u8fd8\u6ca1\u6709\u83b7\u53d6\u5230\uff0c\u5c31\u53bb <strong>\u4e09\u7ea7\u7f13\u5b58 <code>singletonFactories<\/code><\/strong> \u4e2d\u83b7\u53d6\uff0c\u901a\u8fc7\u6267\u884c <code>ObjectFacotry<\/code> \u7684 <code>getObject()<\/code> \u5c31\u53ef\u4ee5\u83b7\u53d6\u8be5\u5bf9\u8c61\uff0c\u83b7\u53d6\u6210\u529f\u4e4b\u540e\uff0c\u4ece\u4e09\u7ea7\u7f13\u5b58\u79fb\u9664\uff0c\u5e76\u5c06\u8be5\u5bf9\u8c61\u52a0\u5165\u5230\u4e8c\u7ea7\u7f13\u5b58\u4e2d\u3002<\/li>\n<\/ol>\n<p>\u5728\u4e09\u7ea7\u7f13\u5b58\u4e2d\u5b58\u50a8\u7684\u662f <code>ObjectFacoty<\/code> \uff1a<\/p>\n<pre><code class=\"java\">public interface ObjectFactory&lt;T&gt; {\n    T getObject() throws BeansException;\n}<\/code><\/pre>\n<p>Spring \u5728\u521b\u5efa Bean \u7684\u65f6\u5019\uff0c\u5982\u679c\u5141\u8bb8\u5faa\u73af\u4f9d\u8d56\u7684\u8bdd\uff0cSpring \u5c31\u4f1a\u5c06\u521a\u521a\u5b9e\u4f8b\u5316\u5b8c\u6210\uff0c\u4f46\u662f\u5c5e\u6027\u8fd8\u6ca1\u6709\u521d\u59cb\u5316\u5b8c\u7684 Bean \u5bf9\u8c61\u7ed9\u63d0\u524d\u66b4\u9732\u51fa\u53bb\uff0c\u8fd9\u91cc\u901a\u8fc7 <code>addSingletonFactory<\/code> \u65b9\u6cd5\uff0c\u5411\u4e09\u7ea7\u7f13\u5b58\u4e2d\u6dfb\u52a0\u4e00\u4e2a <code>ObjectFactory<\/code> \u5bf9\u8c61\uff1a<\/p>\n<pre><code class=\"java\">\/\/ AbstractAutowireCapableBeanFactory # doCreateBean #\npublic abstract class AbstractAutowireCapableBeanFactory ... {\n    protected Object doCreateBean(...) {\n        \/\/...\n\n        \/\/ \u652f\u6491\u5faa\u73af\u4f9d\u8d56\uff1a\u5c06 ()-&gt;getEarlyBeanReference \u4f5c\u4e3a\u4e00\u4e2a ObjectFactory \u5bf9\u8c61\u7684 getObject() \u65b9\u6cd5\u52a0\u5165\u5230\u4e09\u7ea7\u7f13\u5b58\u4e2d\n        addSingletonFactory(beanName, () -&gt; getEarlyBeanReference(beanName, mbd, bean));\n    }\n}<\/code><\/pre>\n<p>\u90a3\u4e48\u4e0a\u8fb9\u5728\u8bf4 Spring \u521b\u5efa Bean \u7684\u6d41\u7a0b\u65f6\u8bf4\u4e86\uff0c\u5982\u679c\u4e00\u7ea7\u7f13\u5b58\u3001\u4e8c\u7ea7\u7f13\u5b58\u90fd\u53d6\u4e0d\u5230\u5bf9\u8c61\u65f6\uff0c\u4f1a\u53bb\u4e09\u7ea7\u7f13\u5b58\u4e2d\u901a\u8fc7 <code>ObjectFactory<\/code> \u7684 <code>getObject<\/code> \u65b9\u6cd5\u83b7\u53d6\u5bf9\u8c61\u3002<\/p>\n<pre><code class=\"java\">class A {\n    \/\/ \u4f7f\u7528\u4e86 B\n    private B b;\n}\nclass B {\n    \/\/ \u4f7f\u7528\u4e86 A\n    private A a;\n}<\/code><\/pre>\n<p>\u4ee5\u4e0a\u9762\u7684\u5faa\u73af\u4f9d\u8d56\u4ee3\u7801\u4e3a\u4f8b\uff0c\u6574\u4e2a\u89e3\u51b3\u5faa\u73af\u4f9d\u8d56\u7684\u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li>\u5f53 Spring \u521b\u5efa A \u4e4b\u540e\uff0c\u53d1\u73b0 A \u4f9d\u8d56\u4e86 B \uff0c\u53c8\u53bb\u521b\u5efa B\uff0cB \u4f9d\u8d56\u4e86 A \uff0c\u53c8\u53bb\u521b\u5efa A\uff1b<\/li>\n<li>\u5728 B \u521b\u5efa A \u7684\u65f6\u5019\uff0c\u90a3\u4e48\u6b64\u65f6 A \u5c31\u53d1\u751f\u4e86\u5faa\u73af\u4f9d\u8d56\uff0c\u7531\u4e8e A \u6b64\u65f6\u8fd8\u6ca1\u6709\u521d\u59cb\u5316\u5b8c\u6210\uff0c\u56e0\u6b64\u5728 <strong>\u4e00\u4e8c\u7ea7\u7f13\u5b58<\/strong> \u4e2d\u80af\u5b9a\u6ca1\u6709 A\uff1b<\/li>\n<li>\u90a3\u4e48\u6b64\u65f6\u5c31\u53bb\u4e09\u7ea7\u7f13\u5b58\u4e2d\u8c03\u7528 <code>getObject()<\/code> \u65b9\u6cd5\u53bb\u83b7\u53d6 A \u7684 <strong>\u524d\u671f\u66b4\u9732\u7684\u5bf9\u8c61<\/strong> \uff0c\u4e5f\u5c31\u662f\u8c03\u7528\u4e0a\u8fb9\u52a0\u5165\u7684 <code>getEarlyBeanReference()<\/code> \u65b9\u6cd5\uff0c\u751f\u6210\u4e00\u4e2a A \u7684 <strong>\u524d\u671f\u66b4\u9732\u5bf9\u8c61<\/strong>\uff1b<\/li>\n<li>\u7136\u540e\u5c31\u5c06\u8fd9\u4e2a <code>ObjectFactory<\/code> \u4ece\u4e09\u7ea7\u7f13\u5b58\u4e2d\u79fb\u9664\uff0c\u5e76\u4e14\u5c06\u524d\u671f\u66b4\u9732\u5bf9\u8c61\u653e\u5165\u5230\u4e8c\u7ea7\u7f13\u5b58\u4e2d\uff0c\u90a3\u4e48 B \u5c31\u5c06\u8fd9\u4e2a\u524d\u671f\u66b4\u9732\u5bf9\u8c61\u6ce8\u5165\u5230\u4f9d\u8d56\uff0c\u6765\u652f\u6301\u5faa\u73af\u4f9d\u8d56\u3002<\/li>\n<\/ul>\n<p><strong>\u53ea\u7528\u4e24\u7ea7\u7f13\u5b58\u591f\u5417\uff1f<\/strong> \u5728\u6ca1\u6709 AOP \u7684\u60c5\u51b5\u4e0b\uff0c\u786e\u5b9e\u53ef\u4ee5\u53ea\u4f7f\u7528\u4e00\u7ea7\u548c\u4e09\u7ea7\u7f13\u5b58\u6765\u89e3\u51b3\u5faa\u73af\u4f9d\u8d56\u95ee\u9898\u3002\u4f46\u662f\uff0c\u5f53\u6d89\u53ca\u5230 AOP \u65f6\uff0c\u4e8c\u7ea7\u7f13\u5b58\u5c31\u663e\u5f97\u975e\u5e38\u91cd\u8981\u4e86\uff0c\u56e0\u4e3a\u5b83\u786e\u4fdd\u4e86\u5373\u4f7f\u5728 Bean \u7684\u521b\u5efa\u8fc7\u7a0b\u4e2d\u6709\u591a\u6b21\u5bf9\u65e9\u671f\u5f15\u7528\u7684\u8bf7\u6c42\uff0c\u4e5f\u59cb\u7ec8\u53ea\u8fd4\u56de\u540c\u4e00\u4e2a\u4ee3\u7406\u5bf9\u8c61\uff0c\u4ece\u800c\u907f\u514d\u4e86\u540c\u4e00\u4e2a Bean \u6709\u591a\u4e2a\u4ee3\u7406\u5bf9\u8c61\u7684\u95ee\u9898\u3002<\/p>\n<p><strong>\u6700\u540e\u603b\u7ed3\u4e00\u4e0b Spring \u5982\u4f55\u89e3\u51b3\u4e09\u7ea7\u7f13\u5b58<\/strong>\uff1a<\/p>\n<p>\u5728\u4e09\u7ea7\u7f13\u5b58\u8fd9\u4e00\u5757\uff0c\u4e3b\u8981\u8bb0\u4e00\u4e0b Spring \u662f\u5982\u4f55\u652f\u6301\u5faa\u73af\u4f9d\u8d56\u7684\u5373\u53ef\uff0c\u4e5f\u5c31\u662f\u5982\u679c\u53d1\u751f\u5faa\u73af\u4f9d\u8d56\u7684\u8bdd\uff0c\u5c31\u53bb <strong>\u4e09\u7ea7\u7f13\u5b58 <code>singletonFactories<\/code><\/strong> \u4e2d\u62ff\u5230\u4e09\u7ea7\u7f13\u5b58\u4e2d\u5b58\u50a8\u7684 <code>ObjectFactory<\/code> \u5e76\u8c03\u7528\u5b83\u7684 <code>getObject()<\/code> \u65b9\u6cd5\u6765\u83b7\u53d6\u8fd9\u4e2a\u5faa\u73af\u4f9d\u8d56\u5bf9\u8c61\u7684\u524d\u671f\u66b4\u9732\u5bf9\u8c61\uff08\u867d\u7136\u8fd8\u6ca1\u521d\u59cb\u5316\u5b8c\u6210\uff0c\u4f46\u662f\u53ef\u4ee5\u62ff\u5230\u8be5\u5bf9\u8c61\u5728\u5806\u4e2d\u7684\u5b58\u50a8\u5730\u5740\u4e86\uff09\uff0c\u5e76\u4e14\u5c06\u8fd9\u4e2a\u524d\u671f\u66b4\u9732\u5bf9\u8c61\u653e\u5230\u4e8c\u7ea7\u7f13\u5b58\u4e2d\uff0c\u8fd9\u6837\u5728\u5faa\u73af\u4f9d\u8d56\u65f6\uff0c\u5c31\u4e0d\u4f1a\u91cd\u590d\u521d\u59cb\u5316\u4e86\uff01<\/p>\n<p>\u4e0d\u8fc7\uff0c\u8fd9\u79cd\u673a\u5236\u4e5f\u6709\u4e00\u4e9b\u7f3a\u70b9\uff0c\u6bd4\u5982\u589e\u52a0\u4e86\u5185\u5b58\u5f00\u9500\uff08\u9700\u8981\u7ef4\u62a4\u4e09\u7ea7\u7f13\u5b58\uff0c\u4e5f\u5c31\u662f\u4e09\u4e2a Map\uff09\uff0c\u964d\u4f4e\u4e86\u6027\u80fd\uff08\u9700\u8981\u8fdb\u884c\u591a\u6b21\u68c0\u67e5\u548c\u8f6c\u6362\uff09\u3002\u5e76\u4e14\uff0c\u8fd8\u6709\u5c11\u90e8\u5206\u60c5\u51b5\u662f\u4e0d\u652f\u6301\u5faa\u73af\u4f9d\u8d56\u7684\uff0c\u6bd4\u5982\u975e\u5355\u4f8b\u7684 bean \u548c<code>@Async<\/code>\u6ce8\u89e3\u7684 bean \u65e0\u6cd5\u652f\u6301\u5faa\u73af\u4f9d\u8d56\u3002<\/p>\n<p>Java \u5e38\u89c1\u6846\u67b6\u9762\u8bd5\u9898\u603b\u7ed3\uff1a<\/p>\n<ul>\n<li><a href=\"https:\/\/link.segmentfault.com\/?enc=NJYMqmMy04amt44TiloaVw%3D%3D.mJTerZvjd%2BHl0aTOF6cX9WFcxzVz3p%2FOLA7Qen8K2t8lXtjuZUePZonKmBJYUpTfU6owbkz79Kg6SCnbyvVnNLa9sIOneQ7GXVYk9bnQVEmEA4hpGxg8sJtoLgyPZ6dA\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Spring \u5e38\u89c1\u9762\u8bd5\u9898\u603b\u7ed3<\/a><\/li>\n<li><a href=\"https:\/\/link.segmentfault.com\/?enc=Z0Q8%2FX4j8%2FltwB7%2Bkbl3VA%3D%3D.5i2gdxJndoz%2BfX3p1MZDlrDnDoUIm4dZSkpusJPIvgzklkMQHdZQYx3G5yQ3NJP2kNHh7vp6wTUPwAgkZRTSviy1ab4AUBYrQon1oTyxA9oiMUsdEb%2FO384%2BjKvSuy8JQO%2FhZyOynulWnj9MQFhBaQ%3D%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">SpringBoot \u5e38\u89c1\u9762\u8bd5\u9898\u603b\u7ed3<\/a><\/li>\n<li><a href=\"https:\/\/link.segmentfault.com\/?enc=sGKd4Iv0OWdV%2FM0v18hDTQ%3D%3D.Lc3TGmACslJCdrLL1ffn6UBJUlpgS%2BeRfEONfRO9IkoqyicBwoWjpX5gADsjA01pYUDd%2FJUDJwY0QnXt2Kd8k%2F5jmxNxoKztAUk%2FQo44ixQ%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">MyBatis \u5e38\u89c1\u9762\u8bd5\u9898\u603b\u7ed3<\/a><\/li>\n<li><a href=\"https:\/\/link.segmentfault.com\/?enc=NG55iSeSQ2lCyq%2BpySZbJg%3D%3D.Jq3qVsG%2BKtyXqekI%2F4jb5JZCepdXgXA%2FmHenuAlkhHzMbQdROOhK%2BiK%2FQ7d7KxZvs49E2gsXRU8DDv5pSRf8zA%3D%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Netty \u5e38\u89c1\u9762\u8bd5\u9898\u603b\u7ed3<\/a><\/li>\n<\/ul>\n<h3>13\u3001\u7b80\u5355\u8bf4\u8bf4\u7ea2\u9ed1\u6811<\/h3>\n<p>\u7ea2\u9ed1\u6811\uff08Red Black Tree\uff09\u662f\u4e00\u79cd\u81ea\u5e73\u8861\u4e8c\u53c9\u67e5\u627e\u6811\u3002\u5b83\u662f\u5728 1972 \u5e74\u7531 Rudolf Bayer \u53d1\u660e\u7684\uff0c\u5f53\u65f6\u88ab\u79f0\u4e3a\u5e73\u8861\u4e8c\u53c9 B \u6811\uff08symmetric binary B-trees\uff09\u3002\u540e\u6765\uff0c\u5728 1978 \u5e74\u88ab Leo J. Guibas \u548c Robert Sedgewick \u4fee\u6539\u4e3a\u5982\u4eca\u7684\u201c\u7ea2\u9ed1\u6811\u201d\u3002<\/p>\n<p>\u7531\u4e8e\u5176\u81ea\u5e73\u8861\u7684\u7279\u6027\uff0c\u4fdd\u8bc1\u4e86\u6700\u574f\u60c5\u5f62\u4e0b\u5728 O(logn) \u65f6\u95f4\u590d\u6742\u5ea6\u5185\u5b8c\u6210\u67e5\u627e\u3001\u589e\u52a0\u3001\u5220\u9664\u7b49\u64cd\u4f5c\uff0c\u6027\u80fd\u8868\u73b0\u7a33\u5b9a\u3002<\/p>\n<p>\u5728 JDK \u4e2d\uff0c<code>TreeMap<\/code>\u3001<code>TreeSet<\/code> \u4ee5\u53ca JDK1.8 \u7684 <code>HashMap<\/code> \u5e95\u5c42\u90fd\u7528\u5230\u4e86\u7ea2\u9ed1\u6811\u3002<\/p>\n<p>\u7ea2\u9ed1\u6811\u7684\u8bde\u751f\u5c31\u662f\u4e3a\u4e86\u89e3\u51b3\u4e8c\u53c9\u67e5\u627e\u6811\u7684\u7f3a\u9677\u3002<\/p>\n<p>\u4e8c\u53c9\u67e5\u627e\u6811\u662f\u4e00\u79cd\u57fa\u4e8e\u6bd4\u8f83\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u7684\u6bcf\u4e2a\u8282\u70b9\u90fd\u6709\u4e00\u4e2a\u952e\u503c\uff0c\u800c\u4e14\u5de6\u5b50\u8282\u70b9\u7684\u952e\u503c\u5c0f\u4e8e\u7236\u8282\u70b9\u7684\u952e\u503c\uff0c\u53f3\u5b50\u8282\u70b9\u7684\u952e\u503c\u5927\u4e8e\u7236\u8282\u70b9\u7684\u952e\u503c\u3002\u8fd9\u6837\u7684\u7ed3\u6784\u53ef\u4ee5\u65b9\u4fbf\u5730\u8fdb\u884c\u67e5\u627e\u3001\u63d2\u5165\u548c\u5220\u9664\u64cd\u4f5c\uff0c\u56e0\u4e3a\u53ea\u9700\u8981\u6bd4\u8f83\u8282\u70b9\u7684\u952e\u503c\u5c31\u53ef\u4ee5\u786e\u5b9a\u76ee\u6807\u8282\u70b9\u7684\u4f4d\u7f6e\u3002\u4f46\u662f\uff0c\u4e8c\u53c9\u67e5\u627e\u6811\u6709\u4e00\u4e2a\u5f88\u5927\u7684\u95ee\u9898\uff0c\u5c31\u662f\u5b83\u7684\u5f62\u72b6\u53d6\u51b3\u4e8e\u8282\u70b9\u63d2\u5165\u7684\u987a\u5e8f\u3002\u5982\u679c\u8282\u70b9\u662f\u6309\u7167\u5347\u5e8f\u6216\u964d\u5e8f\u7684\u65b9\u5f0f\u63d2\u5165\u7684\uff0c\u90a3\u4e48\u4e8c\u53c9\u67e5\u627e\u6811\u5c31\u4f1a\u9000\u5316\u6210\u4e00\u4e2a\u7ebf\u6027\u7ed3\u6784\uff0c\u4e5f\u5c31\u662f\u4e00\u4e2a\u94fe\u8868\u3002\u8fd9\u6837\u7684\u60c5\u51b5\u4e0b\uff0c\u4e8c\u53c9\u67e5\u627e\u6811\u7684\u6027\u80fd\u5c31\u4f1a\u5927\u5927\u964d\u4f4e\uff0c\u65f6\u95f4\u590d\u6742\u5ea6\u5c31\u4f1a\u4ece O(logn) \u53d8\u4e3a O(n)\u3002<\/p>\n<p>\u7ea2\u9ed1\u6811\u7684\u8bde\u751f\u5c31\u662f\u4e3a\u4e86\u89e3\u51b3\u4e8c\u53c9\u67e5\u627e\u6811\u7684\u7f3a\u9677\uff0c\u56e0\u4e3a\u4e8c\u53c9\u67e5\u627e\u6811\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u4f1a\u9000\u5316\u6210\u4e00\u4e2a\u7ebf\u6027\u7ed3\u6784\u3002<\/p>\n<p><strong>\u7ea2\u9ed1\u6811\u7684\u7279\u70b9<\/strong>\uff1a<\/p>\n<ol>\n<li>\u6bcf\u4e2a\u8282\u70b9\u975e\u7ea2\u5373\u9ed1\u3002\u9ed1\u8272\u51b3\u5b9a\u5e73\u8861\uff0c\u7ea2\u8272\u4e0d\u51b3\u5b9a\u5e73\u8861\u3002\u8fd9\u5bf9\u5e94\u4e86 2-3 \u6811\u4e2d\u4e00\u4e2a\u8282\u70b9\u5185\u53ef\u4ee5\u5b58\u653e 1~2 \u4e2a\u8282\u70b9\u3002<\/li>\n<li>\u6839\u8282\u70b9\u603b\u662f\u9ed1\u8272\u7684\u3002<\/li>\n<li>\u6bcf\u4e2a\u53f6\u5b50\u8282\u70b9\u90fd\u662f\u9ed1\u8272\u7684\u7a7a\u8282\u70b9\uff08NIL \u8282\u70b9\uff09\u3002\u8fd9\u91cc\u6307\u7684\u662f\u7ea2\u9ed1\u6811\u90fd\u4f1a\u6709\u4e00\u4e2a\u7a7a\u7684\u53f6\u5b50\u8282\u70b9\uff0c\u662f\u7ea2\u9ed1\u6811\u81ea\u5df1\u7684\u89c4\u5219\u3002<\/li>\n<li>\u5982\u679c\u8282\u70b9\u662f\u7ea2\u8272\u7684\uff0c\u5219\u5b83\u7684\u5b50\u8282\u70b9\u5fc5\u987b\u662f\u9ed1\u8272\u7684\uff08\u53cd\u4e4b\u4e0d\u4e00\u5b9a\uff09\u3002\u901a\u5e38\u8fd9\u6761\u89c4\u5219\u4e5f\u53eb\u4e0d\u4f1a\u6709\u8fde\u7eed\u7684\u7ea2\u8272\u8282\u70b9\u3002\u4e00\u4e2a\u8282\u70b9\u6700\u591a\u4e34\u65f6\u4f1a\u6709 3 \u4e2a\u5b50\u8282\u70b9\uff0c\u4e2d\u95f4\u662f\u9ed1\u8272\u8282\u70b9\uff0c\u5de6\u53f3\u662f\u7ea2\u8272\u8282\u70b9\u3002<\/li>\n<li>\u4ece\u4efb\u610f\u8282\u70b9\u5230\u5b83\u7684\u53f6\u5b50\u8282\u70b9\u6216\u7a7a\u5b50\u8282\u70b9\u7684\u6bcf\u6761\u8def\u5f84\uff0c\u5fc5\u987b\u5305\u542b\u76f8\u540c\u6570\u76ee\u7684\u9ed1\u8272\u8282\u70b9\uff08\u5373\u76f8\u540c\u7684\u9ed1\u8272\u9ad8\u5ea6\uff09\u3002\u6bcf\u4e00\u5c42\u90fd\u53ea\u662f\u6709\u4e00\u4e2a\u8282\u70b9\u8d21\u732e\u4e86\u6811\u9ad8\u51b3\u5b9a\u5e73\u8861\u6027\uff0c\u4e5f\u5c31\u662f\u5bf9\u5e94\u7ea2\u9ed1\u6811\u4e2d\u7684\u9ed1\u8272\u8282\u70b9\u3002<\/li>\n<\/ol>\n<p>\u6b63\u662f\u8fd9\u4e9b\u7279\u70b9\u624d\u4fdd\u8bc1\u4e86\u7ea2\u9ed1\u6811\u7684\u5e73\u8861\uff0c\u8ba9\u7ea2\u9ed1\u6811\u7684\u9ad8\u5ea6\u4e0d\u4f1a\u8d85\u8fc7 2log(n+1)\u3002<\/p>\n<h3>14\u3001HashMap \u4e3a\u4ec0\u4e48\u603b\u662f\u4fdd\u8bc1\u6570\u7ec4\u4e2a\u6570\u4e3a 2 \u7684\u5e42\u6b21\u65b9<\/h3>\n<p>\u4e3a\u4e86\u8ba9 <code>HashMap<\/code> \u5b58\u53d6\u9ad8\u6548\u5e76\u51cf\u5c11\u78b0\u649e\uff0c\u6211\u4eec\u9700\u8981\u786e\u4fdd\u6570\u636e\u5c3d\u91cf\u5747\u5300\u5206\u5e03\u3002\u54c8\u5e0c\u503c\u5728 Java \u4e2d\u901a\u5e38\u4f7f\u7528 <code>int<\/code> \u8868\u793a\uff0c\u5176\u8303\u56f4\u662f <code>-2147483648 ~ 2147483647<\/code>\u524d\u540e\u52a0\u8d77\u6765\u5927\u6982 40 \u4ebf\u7684\u6620\u5c04\u7a7a\u95f4\uff0c\u53ea\u8981\u54c8\u5e0c\u51fd\u6570\u6620\u5c04\u5f97\u6bd4\u8f83\u5747\u5300\u677e\u6563\uff0c\u4e00\u822c\u5e94\u7528\u662f\u5f88\u96be\u51fa\u73b0\u78b0\u649e\u7684\u3002\u4f46\u662f\uff0c\u95ee\u9898\u662f\u4e00\u4e2a 40 \u4ebf\u957f\u5ea6\u7684\u6570\u7ec4\uff0c\u5185\u5b58\u662f\u653e\u4e0d\u4e0b\u7684\u3002\u6240\u4ee5\uff0c\u8fd9\u4e2a\u6563\u5217\u503c\u662f\u4e0d\u80fd\u76f4\u63a5\u62ff\u6765\u7528\u7684\u3002\u7528\u4e4b\u524d\u8fd8\u8981\u5148\u505a\u5bf9\u6570\u7ec4\u7684\u957f\u5ea6\u53d6\u6a21\u8fd0\u7b97\uff0c\u5f97\u5230\u7684\u4f59\u6570\u624d\u80fd\u7528\u6765\u8981\u5b58\u653e\u7684\u4f4d\u7f6e\u4e5f\u5c31\u662f\u5bf9\u5e94\u7684\u6570\u7ec4\u4e0b\u6807\u3002<\/p>\n<p><strong>\u8fd9\u4e2a\u7b97\u6cd5\u5e94\u8be5\u5982\u4f55\u8bbe\u8ba1\u5462\uff1f<\/strong><\/p>\n<p>\u6211\u4eec\u9996\u5148\u53ef\u80fd\u4f1a\u60f3\u5230\u91c7\u7528 % \u53d6\u4f59\u7684\u64cd\u4f5c\u6765\u5b9e\u73b0\u3002\u4f46\u662f\uff0c\u91cd\u70b9\u6765\u4e86\uff1a\u201c<strong>\u53d6\u4f59(%)\u64cd\u4f5c\u4e2d\u5982\u679c\u9664\u6570\u662f 2 \u7684\u5e42\u6b21\u5219\u7b49\u4ef7\u4e8e\u4e0e\u5176\u9664\u6570\u51cf\u4e00\u7684\u4e0e(&#038;)\u64cd\u4f5c<\/strong>\uff08\u4e5f\u5c31\u662f\u8bf4 <code>hash%length==hash&amp;(length-1)<\/code> \u7684\u524d\u63d0\u662f length \u662f 2 \u7684 n \u6b21\u65b9\uff09\u3002\u201d \u5e76\u4e14\uff0c<strong>\u91c7\u7528\u4e8c\u8fdb\u5236\u4f4d\u64cd\u4f5c &#038; \u76f8\u5bf9\u4e8e % \u80fd\u591f\u63d0\u9ad8\u8fd0\u7b97\u6548\u7387<\/strong>\u3002<\/p>\n<p>\u9664\u4e86\u4e0a\u9762\u6240\u8bf4\u7684\u4f4d\u8fd0\u7b97\u6bd4\u53d6\u4f59\u6548\u7387\u9ad8\u4e4b\u5916\uff0c\u6211\u89c9\u5f97\u66f4\u91cd\u8981\u7684\u4e00\u4e2a\u539f\u56e0\u662f\uff1a<strong>\u957f\u5ea6\u662f 2 \u7684\u5e42\u6b21\u65b9\uff0c\u53ef\u4ee5\u8ba9 <code>HashMap<\/code> \u5728\u6269\u5bb9\u7684\u65f6\u5019\u66f4\u5747\u5300<\/strong>\u3002\u4f8b\u5982:<\/p>\n<ul>\n<li>length = 8 \u65f6\uff0clength &#8211; 1 = 7 \u7684\u4e8c\u8fdb\u5236\u4f4d<code>0111<\/code><\/li>\n<li>length = 16 \u65f6\uff0clength &#8211; 1 = 15 \u7684\u4e8c\u8fdb\u5236\u4f4d<code>1111<\/code><\/li>\n<\/ul>\n<p>\u8fd9\u65f6\u5019\u539f\u672c\u5b58\u5728 <code>HashMap<\/code> \u4e2d\u7684\u5143\u7d20\u8ba1\u7b97\u65b0\u7684\u6570\u7ec4\u4f4d\u7f6e\u65f6 <code>hash&amp;(length-1)<\/code>\uff0c\u53d6\u51b3 hash \u7684\u7b2c\u56db\u4e2a\u4e8c\u8fdb\u5236\u4f4d\uff08\u4ece\u53f3\u6570\uff09\uff0c\u4f1a\u51fa\u73b0\u4e24\u79cd\u60c5\u51b5\uff1a<\/p>\n<ol>\n<li>\u7b2c\u56db\u4e2a\u4e8c\u8fdb\u5236\u4f4d\u4e3a 0\uff0c\u6570\u7ec4\u4f4d\u7f6e\u4e0d\u53d8\uff0c\u4e5f\u5c31\u662f\u8bf4\u5f53\u524d\u5143\u7d20\u5728\u65b0\u6570\u7ec4\u548c\u65e7\u6570\u7ec4\u7684\u4f4d\u7f6e\u76f8\u540c\u3002<\/li>\n<li>\u7b2c\u56db\u4e2a\u4e8c\u8fdb\u5236\u4f4d\u4e3a 1\uff0c\u6570\u7ec4\u4f4d\u7f6e\u5728\u65b0\u6570\u7ec4\u6269\u5bb9\u4e4b\u540e\u7684\u90a3\u4e00\u90e8\u5206\u3002<\/li>\n<\/ol>\n<p>\u8fd9\u91cc\u5217\u4e3e\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<pre><code class=\"plain\">\u5047\u8bbe\u6709\u4e00\u4e2a\u5143\u7d20\u7684\u54c8\u5e0c\u503c\u4e3a 10101100\n\n\u65e7\u6570\u7ec4\u5143\u7d20\u4f4d\u7f6e\u8ba1\u7b97\uff1a\nhash        = 10101100\nlength - 1  = 00000111\n&amp; -----------------\nindex       = 00000100  (4)\n\n\u65b0\u6570\u7ec4\u5143\u7d20\u4f4d\u7f6e\u8ba1\u7b97\uff1a\nhash        = 10101100\nlength - 1  = 00001111\n&amp; -----------------\nindex       = 00001100  (12)\n\n\u770b\u7b2c\u56db\u4f4d\uff08\u4ece\u53f3\u6570\uff09\uff1a\n1.\u9ad8\u4f4d\u4e3a 0\uff1a\u4f4d\u7f6e\u4e0d\u53d8\u3002\n2.\u9ad8\u4f4d\u4e3a 1\uff1a\u79fb\u52a8\u5230\u65b0\u4f4d\u7f6e\uff08\u539f\u7d22\u5f15\u4f4d\u7f6e+\u539f\u5bb9\u91cf\uff09\u3002<\/code><\/pre>\n<p>\u26a0\ufe0f \u6ce8\u610f\uff1a\u8fd9\u91cc\u5217\u4e3e\u7684\u573a\u666f\u770b\u7684\u662f\u7b2c\u56db\u4e2a\u4e8c\u8fdb\u5236\u4f4d\uff0c\u66f4\u51c6\u786e\u70b9\u6765\u8bf4\u770b\u7684\u662f\u9ad8\u4f4d\uff08\u4ece\u53f3\u6570\uff09\uff0c\u4f8b\u5982 <code>length = 32<\/code> \u65f6\uff0c<code>length - 1 = 31<\/code>\uff0c\u4e8c\u8fdb\u5236\u4e3a <code>11111<\/code>\uff0c\u8fd9\u91cc\u770b\u7684\u5c31\u662f\u7b2c\u4e94\u4e2a\u4e8c\u8fdb\u5236\u4f4d\u3002<\/p>\n<p>\u4e5f\u5c31\u662f\u8bf4\u6269\u5bb9\u4e4b\u540e\uff0c\u5728\u65e7\u6570\u7ec4\u5143\u7d20 hash \u503c\u6bd4\u8f83\u5747\u5300\uff08\u81f3\u4e8e hash \u503c\u5747\u4e0d\u5747\u5300\uff0c\u53d6\u51b3\u4e8e\u524d\u9762\u8bb2\u7684\u5bf9\u8c61\u7684 <code>hashcode()<\/code> \u65b9\u6cd5\u548c\u6270\u52a8\u51fd\u6570\uff09\u7684\u60c5\u51b5\u4e0b\uff0c\u65b0\u6570\u7ec4\u5143\u7d20\u4e5f\u4f1a\u88ab\u5206\u914d\u7684\u6bd4\u8f83\u5747\u5300\uff0c\u6700\u597d\u7684\u60c5\u51b5\u662f\u4f1a\u6709\u4e00\u534a\u5728\u65b0\u6570\u7ec4\u7684\u524d\u534a\u90e8\u5206\uff0c\u4e00\u534a\u5728\u65b0\u6570\u7ec4\u540e\u534a\u90e8\u5206\u3002<\/p>\n<p>\u8fd9\u6837\u4e5f\u4f7f\u5f97\u6269\u5bb9\u673a\u5236\u53d8\u5f97\u7b80\u5355\u548c\u9ad8\u6548\uff0c\u6269\u5bb9\u540e\u53ea\u9700\u68c0\u67e5\u54c8\u5e0c\u503c\u9ad8\u4f4d\u7684\u53d8\u5316\u6765\u51b3\u5b9a\u5143\u7d20\u7684\u65b0\u4f4d\u7f6e\uff0c\u8981\u4e48\u4f4d\u7f6e\u4e0d\u53d8\uff08\u9ad8\u4f4d\u4e3a 0\uff09\uff0c\u8981\u4e48\u5c31\u662f\u79fb\u52a8\u5230\u65b0\u4f4d\u7f6e\uff08\u9ad8\u4f4d\u4e3a 1\uff0c\u539f\u7d22\u5f15\u4f4d\u7f6e+\u539f\u5bb9\u91cf\uff09\u3002<\/p>\n<p>\u6700\u540e\uff0c\u7b80\u5355\u603b\u7ed3\u4e00\u4e0b <code>HashMap<\/code> \u7684\u957f\u5ea6\u662f 2 \u7684\u5e42\u6b21\u65b9\u7684\u539f\u56e0\uff1a<\/p>\n<ol>\n<li>\u4f4d\u8fd0\u7b97\u6548\u7387\u66f4\u9ad8\uff1a\u4f4d\u8fd0\u7b97(&#038;)\u6bd4\u53d6\u4f59\u8fd0\u7b97(%)\u66f4\u9ad8\u6548\u3002\u5f53\u957f\u5ea6\u4e3a 2 \u7684\u5e42\u6b21\u65b9\u65f6\uff0c<code>hash % length<\/code> \u7b49\u4ef7\u4e8e <code>hash &amp; (length - 1)<\/code>\u3002<\/li>\n<li>\u53ef\u4ee5\u66f4\u597d\u5730\u4fdd\u8bc1\u54c8\u5e0c\u503c\u7684\u5747\u5300\u5206\u5e03\uff1a\u6269\u5bb9\u4e4b\u540e\uff0c\u5728\u65e7\u6570\u7ec4\u5143\u7d20 hash \u503c\u6bd4\u8f83\u5747\u5300\u7684\u60c5\u51b5\u4e0b\uff0c\u65b0\u6570\u7ec4\u5143\u7d20\u4e5f\u4f1a\u88ab\u5206\u914d\u7684\u6bd4\u8f83\u5747\u5300\uff0c\u6700\u597d\u7684\u60c5\u51b5\u662f\u4f1a\u6709\u4e00\u534a\u5728\u65b0\u6570\u7ec4\u7684\u524d\u534a\u90e8\u5206\uff0c\u4e00\u534a\u5728\u65b0\u6570\u7ec4\u540e\u534a\u90e8\u5206\u3002<\/li>\n<li>\u6269\u5bb9\u673a\u5236\u53d8\u5f97\u7b80\u5355\u548c\u9ad8\u6548\uff1a\u6269\u5bb9\u540e\u53ea\u9700\u68c0\u67e5\u54c8\u5e0c\u503c\u9ad8\u4f4d\u7684\u53d8\u5316\u6765\u51b3\u5b9a\u5143\u7d20\u7684\u65b0\u4f4d\u7f6e\uff0c\u8981\u4e48\u4f4d\u7f6e\u4e0d\u53d8\uff08\u9ad8\u4f4d\u4e3a 0\uff09\uff0c\u8981\u4e48\u5c31\u662f\u79fb\u52a8\u5230\u65b0\u4f4d\u7f6e\uff08\u9ad8\u4f4d\u4e3a 1\uff0c\u539f\u7d22\u5f15\u4f4d\u7f6e+\u539f\u5bb9\u91cf\uff09\u3002<\/li>\n<\/ol>\n<p><a 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