{"id":104131,"date":"2026-09-11T22:00:58","date_gmt":"2026-09-11T14:00:58","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/104131.html"},"modified":"2026-09-11T22:00:58","modified_gmt":"2026-09-11T14:00:58","slug":"%e9%a2%86%e5%88%b8%e5%8a%9f%e8%83%bd%e8%b8%a9%e4%ba%86%e5%9b%9b%e4%b8%aa%e5%9d%91%ef%bc%9a%e8%b6%85%e5%8d%96%e3%80%81%e9%94%81%e5%a4%b1%e6%95%88%e3%80%81%e4%ba%8b%e5%8a%a1%e5%a4%b1%e6%95%88%e3%80%81","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/104131.html","title":{"rendered":"\u9886\u5238\u529f\u80fd\u8e29\u4e86\u56db\u4e2a\u5751\uff1a\u8d85\u5356\u3001\u9501\u5931\u6548\u3001\u4e8b\u52a1\u5931\u6548\u3001\u4ee3\u7406\u5bf9\u8c61\u4e22\u5931\uff0c\u6bcf\u4e2a\u5751\u80cc\u540e\u90fd\u662f\u4e00\u7c7b\u7ecf\u5178\u95ee\u9898"},"content":{"rendered":"

\u4e0a\u4e00\u7bc7\u535a\u5ba2\u5199\u4e86\u4f18\u60e0\u5238\u7ba1\u7406\u548c\u5151\u6362\u7801\u7b97\u6cd5，\u8fd9\u5468\u7ee7\u7eed\u5f80\u4e0b\u505a\u2014\u2014\u7528\u6237\u9886\u5238\u3002\u529f\u80fd\u672c\u8eab\u4e0d\u590d\u6742：\u67e5\u5238\u3001\u6821\u9a8c\u3001\u63d2\u5165\u7528\u6237\u5238\u8bb0\u5f55\u3001\u6263\u51cf\u5e93\u5b58\u3002\u4f46\u7528 JMeter \u4e00\u8dd1\u5e76\u53d1\u6d4b\u8bd5\u5c31\u70b8\u4e86：100 \u4e2a\u5e93\u5b58\u53d1\u4e86 109 \u5f20\u5238，\u7528\u6237\u9650\u9886 2 \u5f20\u7ed3\u679c\u9886\u4e86 4 \u5f20，\u52a0\u4e86\u9501\u6ca1\u7528，\u52a0\u4e86\u4e8b\u52a1\u4e5f\u6ca1\u7528\u3002\u524d\u524d\u540e\u540e\u6539\u4e86\u56db\u8f6e，\u6bcf\u4e00\u8f6e\u89e3\u51b3\u4e00\u4e2a\u95ee\u9898，\u540c\u65f6\u5f15\u51fa\u4e0b\u4e00\u4e2a\u95ee\u9898\u3002\u6574\u4e2a\u8fc7\u7a0b\u50cf\u62c6\u8fde\u73af\u70b8\u5f39，\u526a\u4e86\u4e00\u6839\u7ebf\u7ed3\u679c\u65c1\u8fb9\u8fd8\u85cf\u7740\u4e00\u6839\u3002\u4f46\u4e5f\u6b63\u662f\u8fd9\u56db\u4e2a\u5751，\u8ba9\u6211\u5bf9\u4e50\u89c2\u9501\u3001synchronized \u9501\u5bf9\u8c61\u3001\u4e8b\u52a1\u8fb9\u754c\u3001Spring \u4ee3\u7406\u673a\u5236\u7684\u7406\u89e3\u4ece"\u77e5\u9053"\u53d8\u6210\u4e86"\u771f\u61c2"\u3002<\/p>\n

\u4e00\u3001\u7b2c\u4e00\u9897\u70b8\u5f39：\u8d85\u5356\u2014\u2014100 \u4e2a\u5e93\u5b58\u53d1\u4e86 109 \u5f20\u5238<\/h3>\n

\u9886\u5238\u7684\u6838\u5fc3\u903b\u8f91\u662f\u4e09\u6b65\u8d70：\u67e5\u8be2\u5e93\u5b58 \u2192 \u5224\u65ad\u662f\u5426\u5145\u8db3 \u2192 \u66f4\u65b0\u5df2\u53d1\u653e\u6570\u91cf\u3002\u5355\u7ebf\u7a0b\u8dd1\u5b8c\u5168\u6ca1\u95ee\u9898，\u4f46\u5e76\u53d1\u573a\u666f\u4e0b\u5c31\u51fa\u4e8b\u4e86：<\/p>\n

💾 \u6570\u636e\u5e93🧵 \u7ebf\u7a0b2🧵 \u7ebf\u7a0b1💾 \u6570\u636e\u5e93🧵 \u7ebf\u7a0b2🧵 \u7ebf\u7a0b1#mermaid-svg-pkzerSKqGCLWKhSd{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-pkzerSKqGCLWKhSd .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-pkzerSKqGCLWKhSd .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-pkzerSKqGCLWKhSd .error-icon{fill:#552222;}#mermaid-svg-pkzerSKqGCLWKhSd .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-pkzerSKqGCLWKhSd .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-pkzerSKqGCLWKhSd .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-pkzerSKqGCLWKhSd .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-pkzerSKqGCLWKhSd .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-pkzerSKqGCLWKhSd .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-pkzerSKqGCLWKhSd .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-pkzerSKqGCLWKhSd .marker{fill:#333333;stroke:#333333;}#mermaid-svg-pkzerSKqGCLWKhSd .marker.cross{stroke:#333333;}#mermaid-svg-pkzerSKqGCLWKhSd svg{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-pkzerSKqGCLWKhSd p{margin:0;}#mermaid-svg-pkzerSKqGCLWKhSd .actor{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-pkzerSKqGCLWKhSd text.actor>tspan{fill:black;stroke:none;}#mermaid-svg-pkzerSKqGCLWKhSd .actor-line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-pkzerSKqGCLWKhSd .innerArc{stroke-width:1.5;stroke-dasharray:none;}#mermaid-svg-pkzerSKqGCLWKhSd .messageLine0{stroke-width:1.5;stroke-dasharray:none;stroke:#333;}#mermaid-svg-pkzerSKqGCLWKhSd .messageLine1{stroke-width:1.5;stroke-dasharray:2,2;stroke:#333;}#mermaid-svg-pkzerSKqGCLWKhSd #arrowhead path{fill:#333;stroke:#333;}#mermaid-svg-pkzerSKqGCLWKhSd .sequenceNumber{fill:white;}#mermaid-svg-pkzerSKqGCLWKhSd #sequencenumber{fill:#333;}#mermaid-svg-pkzerSKqGCLWKhSd #crosshead path{fill:#333;stroke:#333;}#mermaid-svg-pkzerSKqGCLWKhSd .messageText{fill:#333;stroke:none;}#mermaid-svg-pkzerSKqGCLWKhSd .labelBox{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-pkzerSKqGCLWKhSd .labelText,#mermaid-svg-pkzerSKqGCLWKhSd .labelText>tspan{fill:black;stroke:none;}#mermaid-svg-pkzerSKqGCLWKhSd .loopText,#mermaid-svg-pkzerSKqGCLWKhSd .loopText>tspan{fill:black;stroke:none;}#mermaid-svg-pkzerSKqGCLWKhSd .loopLine{stroke-width:2px;stroke-dasharray:2,2;stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-pkzerSKqGCLWKhSd .note{stroke:#aaaa33;fill:#fff5ad;}#mermaid-svg-pkzerSKqGCLWKhSd .noteText,#mermaid-svg-pkzerSKqGCLWKhSd .noteText>tspan{fill:black;stroke:none;}#mermaid-svg-pkzerSKqGCLWKhSd .activation0{fill:#f4f4f4;stroke:#666;}#mermaid-svg-pkzerSKqGCLWKhSd .activation1{fill:#f4f4f4;stroke:#666;}#mermaid-svg-pkzerSKqGCLWKhSd .activation2{fill:#f4f4f4;stroke:#666;}#mermaid-svg-pkzerSKqGCLWKhSd .actorPopupMenu{position:absolute;}#mermaid-svg-pkzerSKqGCLWKhSd .actorPopupMenuPanel{position:absolute;fill:#ECECFF;box-shadow:0px 8px 16px 0px rgba(0,0,0,0.2);filter:drop-shadow(3px 5px 2px rgb(0 0 0 \/ 0.4));}#mermaid-svg-pkzerSKqGCLWKhSd .actor-man line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-pkzerSKqGCLWKhSd .actor-man circle,#mermaid-svg-pkzerSKqGCLWKhSd line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;stroke-width:2px;}#mermaid-svg-pkzerSKqGCLWKhSd :root{–mermaid-font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;}💥 \u8d85\u5356！\u5e93\u5b58100，\u53d1\u4e86101\u5f20SELECT issue_num \u2192 99SELECT issue_num \u2192 99\u5224\u65ad 99 < 100 \u2705\u5224\u65ad 99 < 100 \u2705UPDATE issue_num = issue_num + 1 \u2192 100UPDATE issue_num = issue_num + 1 \u2192 101<\/p>\n

\u8fd9\u5f20\u56fe\u8bf4\u7684\u662f\u7ecf\u5178\u7684"\u5148\u67e5\u540e\u6539"\u95ee\u9898：\u4e24\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bfb\u5230\u5e93\u5b58 99，\u90fd\u5224\u65ad\u5145\u8db3，\u90fd\u6267\u884c\u66f4\u65b0，\u7ed3\u679c\u8d85\u5356\u4e86\u3002\u6839\u672c\u539f\u56e0\u662f\u67e5\u8be2\u3001\u5224\u65ad\u3001\u66f4\u65b0\u8fd9\u4e09\u6b65\u64cd\u4f5c\u4e0d\u5177\u5907\u539f\u5b50\u6027\u3002<\/p>\n

\u4e50\u89c2\u9501\u7684\u6539\u8fdb\u65b9\u6848<\/h4>\n

\u6700\u76f4\u63a5\u7684\u65b9\u6848\u662f\u60b2\u89c2\u9501（synchronized），\u4f46\u6027\u80fd\u5dee\u3002\u66f4\u597d\u7684\u601d\u8def\u662f\u4e50\u89c2\u9501\u2014\u2014\u4e0d\u52a0\u9501，\u5728\u66f4\u65b0\u65f6\u505a\u6821\u9a8c\u3002<\/p>\n

\u4f20\u7edf\u4e50\u89c2\u9501\u662f CAS \u601d\u60f3：UPDATE SET issue_num = issue_num + 1 WHERE id = ? AND issue_num = 99，WHERE \u540e\u9762\u8ddf\u7684\u662f\u4e4b\u524d\u67e5\u5230\u7684\u503c\u3002\u5982\u679c\u503c\u53d8\u4e86，\u8bf4\u660e\u6709\u522b\u7684\u7ebf\u7a0b\u6539\u8fc7\u4e86，\u66f4\u65b0\u5931\u8d25\u3002<\/p>\n

\u4f46\u4f20\u7edf CAS \u6709\u4e2a\u95ee\u9898：10 \u4e2a\u7ebf\u7a0b\u5e76\u53d1，\u53ea\u6709 1 \u4e2a\u80fd\u6210\u529f，\u5931\u8d25\u7387\u592a\u9ad8\u3002<\/p>\n

\u9879\u76ee\u91cc\u7528\u4e86\u4e00\u4e2a\u5de7\u5999\u7684\u6539\u8fdb：\u4e0d\u5224\u65ad issue_num \u662f\u5426\u7b49\u4e8e\u65e7\u503c，\u53ea\u5224\u65ad issue_num \u662f\u5426\u5c0f\u4e8e total_num\u3002\u8fd9\u6837\u53ea\u8981\u5e93\u5b58\u8fd8\u6709，\u6240\u6709\u7ebf\u7a0b\u90fd\u80fd\u6210\u529f；\u5e93\u5b58\u6ca1\u4e86，\u6240\u6709\u7ebf\u7a0b\u90fd\u5931\u8d25\u3002\u4e0d\u5b58\u5728"\u53ea\u6709\u4e00\u4e2a\u6210\u529f"\u7684\u95ee\u9898\u3002<\/p>\n

— \u6539\u8fdb\u7248\u4e50\u89c2\u9501：WHERE \u6761\u4ef6\u5224\u65ad\u5e93\u5b58\u662f\u5426\u5145\u8db3<\/span>
\nUPDATE<\/span> coupon SET<\/span> issue_num =<\/span> issue_num +<\/span> 1<\/span>
\nWHERE<\/span> id =<\/span> #{couponId} AND issue_num < total_num<\/span><\/p>\n

int<\/span> r =<\/span> couponMapper.<\/span>incrIssueNum<\/span>(<\/span>coupon.<\/span>getId<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\nif<\/span> (<\/span>r ==<\/span> 0<\/span>)<\/span> {<\/span>
\n throw<\/span> new<\/span> BizIllegalException<\/span>(<\/span>"\u4f18\u60e0\u5238\u5e93\u5b58\u4e0d\u8db3"<\/span>)<\/span>;<\/span>
\n}<\/span><\/p>\n

WHERE \u6761\u4ef6\u4e0d\u6210\u7acb\u65f6\u4e0d\u4f1a\u62a5\u9519，\u800c\u662f\u8fd4\u56de 0\u3002\u5224\u65ad\u8fd4\u56de\u503c，\u4e3a 0 \u5c31\u629b\u5f02\u5e38\u89e6\u53d1\u56de\u6eda\u3002<\/p>\n\n\u5bf9\u6bd4\u7ef4\u5ea6\u4f20\u7edf\u4e50\u89c2\u9501（CAS）\u6539\u8fdb\u7248\u4e50\u89c2\u9501<\/tr>\n\n\n\n\n\n
WHERE \u6761\u4ef6<\/td>\nissue_num = \u65e7\u503c<\/td>\nissue_num < total_num<\/td>\n<\/tr>\n
\u5e76\u53d1\u6210\u529f\u7387<\/td>\nN \u4e2a\u7ebf\u7a0b\u53ea\u6709 1 \u4e2a\u6210\u529f<\/td>\n\u53ea\u8981\u6709\u5e93\u5b58\u5c31\u80fd\u6210\u529f<\/td>\n<\/tr>\n
\u5b89\u5168\u6027<\/td>\n\u4e25\u683c\u4e00\u81f4<\/td>\n\u5e93\u5b58\u573a\u666f\u4e0b\u7b49\u4ef7<\/td>\n<\/tr>\n
\u9002\u7528\u573a\u666f<\/td>\n\u901a\u7528<\/td>\n\u5e93\u5b58\/\u9650\u989d\u7c7b\u4e1a\u52a1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4e8c\u3001\u7b2c\u4e8c\u9897\u70b8\u5f39：\u9501\u5931\u6548\u2014\u2014Long.toString() \u6bcf\u6b21 new \u4e00\u4e2a\u65b0\u5bf9\u8c61<\/h3>\n

\u8d85\u5356\u89e3\u51b3\u4e86，\u4f46\u7528\u6237\u9650\u9886\u6570\u91cf\u7684\u6821\u9a8c\u8fd8\u6709\u95ee\u9898\u3002\u5e93\u5b58\u53ef\u4ee5\u7528\u4e50\u89c2\u9501，\u4f46\u9650\u9886\u6570\u91cf\u4e0d\u884c\u2014\u2014\u56e0\u4e3a\u8fd9\u91cc\u8981\u5148\u7edf\u8ba1\u5f53\u524d\u7528\u6237\u5df2\u9886\u4e86\u591a\u5c11\u5f20，\u518d\u5224\u65ad\u662f\u5426\u8d85\u9650，\u7edf\u8ba1\u7684\u662f user_coupon \u8868\u7684\u8bb0\u5f55\u6570，\u6ca1\u6cd5\u5728 WHERE \u6761\u4ef6\u91cc\u505a\u5224\u65ad\u3002<\/p>\n

\u53ea\u80fd\u4e0a\u60b2\u89c2\u9501\u3002\u9501\u7684\u8303\u56f4\u4e0d\u9700\u8981\u592a\u5927，\u53ea\u8981\u9501\u4f4f"\u540c\u4e00\u4e2a\u7528\u6237"\u5c31\u884c\u3002\u4e8e\u662f\u7528\u4e86 synchronized \u4ee3\u7801\u5757，\u9501\u5bf9\u8c61\u662f\u7528\u6237 ID：<\/p>\n

\/\/ \u770b\u4f3c\u6b63\u786e\u7684\u5199\u6cd5<\/span>
\nsynchronized<\/span>(<\/span>userId.<\/span>toString<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
\n \/\/ \u7edf\u8ba1\u5df2\u9886\u6570\u91cf\u3001\u5224\u65ad\u3001\u65b0\u589e\u7528\u6237\u5238…<\/span>
\n}<\/span><\/p>\n

JMeter \u4e00\u8dd1，\u9501\u6ca1\u751f\u6548\u3002<\/p>\n

\u95ee\u9898\u51fa\u5728 userId.toString() \u4e0a\u3002Long \u7684 toString \u6e90\u7801\u662f\u8fd9\u6837\u7684：<\/p>\n

\/\/ Long.toString() \u7684\u6e90\u7801<\/span>
\npublic<\/span> String<\/span> toString<\/span>(<\/span>)<\/span> {<\/span>
\n return<\/span> String<\/span>.<\/span>valueOf<\/span>(<\/span>value)<\/span>;<\/span> \/\/ \u5185\u90e8\u8c03\u7528 new String()<\/span>
\n}<\/span><\/p>\n

\u6bcf\u6b21\u8c03\u7528\u90fd new \u4e86\u4e00\u4e2a\u65b0\u7684 String \u5bf9\u8c61\u3002\u540c\u4e00\u4e2a\u7528\u6237 ID \u662f 100，\u4e24\u6b21 toString() \u5f97\u5230\u7684\u662f\u4e24\u4e2a\u5185\u5bb9\u76f8\u540c\u4f46\u5730\u5740\u4e0d\u540c\u7684 String \u5bf9\u8c61\u2014\u2014\u4e24\u628a\u4e0d\u540c\u7684\u9501\u3002synchronized \u9501\u7684\u662f\u5bf9\u8c61\u5f15\u7528，\u4e0d\u662f\u5185\u5bb9，\u6240\u4ee5\u6839\u672c\u9501\u4e0d\u4f4f\u3002<\/p>\n

intern() \u7684\u6551\u573a<\/h4>\n

String \u7684 intern() \u65b9\u6cd5\u4f1a\u8fd4\u56de\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4e2d\u7684\u552f\u4e00\u5f15\u7528\u3002\u53ea\u8981\u4e24\u4e2a\u5b57\u7b26\u4e32\u5185\u5bb9\u76f8\u540c，intern() \u8fd4\u56de\u7684\u5c31\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61：<\/p>\n

\/\/ \u6b63\u786e\u5199\u6cd5：\u52a0 intern()<\/span>
\nsynchronized<\/span>(<\/span>userId.<\/span>toString<\/span>(<\/span>)<\/span>.<\/span>intern<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
\n checkAndCreateUserCoupon<\/span>(<\/span>coupon,<\/span> userId,<\/span> null<\/span>)<\/span>;<\/span>
\n}<\/span><\/p>\n

intern() \u4fdd\u8bc1：\u5185\u5bb9\u76f8\u540c\u7684\u5b57\u7b26\u4e32，== \u6bd4\u8f83\u4e5f\u8fd4\u56de true\u3002\u8fd9\u6837\u540c\u4e00\u4e2a\u7528\u6237 ID \u6c38\u8fdc\u9501\u7684\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61\u3002<\/p>\n

\u8fd9\u4e2a\u5751\u544a\u8bc9\u6211\u4e00\u4e2a\u9053\u7406：synchronized \u9501\u7684\u662f\u5bf9\u8c61\u5f15\u7528，\u4e0d\u662f\u503c\u3002\u7528 String \u505a\u9501\u5bf9\u8c61\u65f6，\u5fc5\u987b\u786e\u4fdd\u62ff\u5230\u7684\u662f\u5e38\u91cf\u6c60\u4e2d\u7684\u552f\u4e00\u5f15\u7528\u3002<\/p>\n

\u4e09\u3001\u7b2c\u4e09\u9897\u70b8\u5f39：\u4e8b\u52a1\u8fb9\u754c\u2014\u2014\u5148\u5f00\u4e8b\u52a1\u518d\u62ff\u9501，\u9501\u767d\u52a0\u4e86<\/h3>\n

\u9501\u5bf9\u8c61\u4fee\u597d\u4e86，JMeter \u518d\u8dd1，\u7528\u6237\u8fd8\u662f\u8d85\u9886\u4e86\u3002<\/p>\n

\u8fd9\u6b21\u7684\u95ee\u9898\u66f4\u9690\u853d\u3002\u6574\u4e2a\u9886\u5238\u65b9\u6cd5\u4e0a\u52a0\u4e86 @Transactional，\u800c synchronized \u5728\u65b9\u6cd5\u5185\u90e8\u3002\u6267\u884c\u987a\u5e8f\u53d8\u6210\u4e86：<\/p>\n

\u5f00\u542f\u4e8b\u52a1 \u2192 \u83b7\u53d6\u9501 \u2192 \u7edf\u8ba1\u5df2\u9886\u6570\u91cf \u2192 \u5224\u65ad \u2192 \u65b0\u589e\u7528\u6237\u5238 \u2192 \u91ca\u653e\u9501 \u2192 \u63d0\u4ea4\u4e8b\u52a1<\/p>\n

\u95ee\u9898\u51fa\u5728"\u91ca\u653e\u9501"\u548c"\u63d0\u4ea4\u4e8b\u52a1"\u7684\u987a\u5e8f\u4e0a\u3002\u7ebf\u7a0b 1 \u91ca\u653e\u9501\u7684\u65f6\u5019，\u4e8b\u52a1\u8fd8\u6ca1\u63d0\u4ea4\u3002\u7ebf\u7a0b 2 \u7acb\u523b\u62ff\u5230\u9501，\u5f00\u59cb\u7edf\u8ba1\u5df2\u9886\u6570\u91cf\u2014\u2014\u4f46\u7ebf\u7a0b 1 \u7684\u6570\u636e\u8fd8\u6ca1\u63d0\u4ea4，\u7ebf\u7a0b 2 \u8bfb\u4e0d\u5230\u3002\u4e8e\u662f\u7ebf\u7a0b 2 \u8ba4\u4e3a\u7528\u6237\u8fd8\u6ca1\u9886\u8fc7\u5238，\u53c8\u63d2\u5165\u4e86\u4e00\u6761\u8bb0\u5f55\u3002<\/p>\n

💾 \u6570\u636e\u5e93🧵 \u7ebf\u7a0b2🧵 \u7ebf\u7a0b1💾 \u6570\u636e\u5e93🧵 \u7ebf\u7a0b2🧵 \u7ebf\u7a0b1#mermaid-svg-X2LkTDnqx7NhOkvm{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-X2LkTDnqx7NhOkvm .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-X2LkTDnqx7NhOkvm .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-X2LkTDnqx7NhOkvm .error-icon{fill:#552222;}#mermaid-svg-X2LkTDnqx7NhOkvm .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-X2LkTDnqx7NhOkvm .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-X2LkTDnqx7NhOkvm .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-X2LkTDnqx7NhOkvm .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-X2LkTDnqx7NhOkvm .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-X2LkTDnqx7NhOkvm .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-X2LkTDnqx7NhOkvm .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-X2LkTDnqx7NhOkvm .marker{fill:#333333;stroke:#333333;}#mermaid-svg-X2LkTDnqx7NhOkvm .marker.cross{stroke:#333333;}#mermaid-svg-X2LkTDnqx7NhOkvm svg{font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-X2LkTDnqx7NhOkvm p{margin:0;}#mermaid-svg-X2LkTDnqx7NhOkvm .actor{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-X2LkTDnqx7NhOkvm text.actor>tspan{fill:black;stroke:none;}#mermaid-svg-X2LkTDnqx7NhOkvm .actor-line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-X2LkTDnqx7NhOkvm .innerArc{stroke-width:1.5;stroke-dasharray:none;}#mermaid-svg-X2LkTDnqx7NhOkvm .messageLine0{stroke-width:1.5;stroke-dasharray:none;stroke:#333;}#mermaid-svg-X2LkTDnqx7NhOkvm .messageLine1{stroke-width:1.5;stroke-dasharray:2,2;stroke:#333;}#mermaid-svg-X2LkTDnqx7NhOkvm #arrowhead path{fill:#333;stroke:#333;}#mermaid-svg-X2LkTDnqx7NhOkvm .sequenceNumber{fill:white;}#mermaid-svg-X2LkTDnqx7NhOkvm #sequencenumber{fill:#333;}#mermaid-svg-X2LkTDnqx7NhOkvm #crosshead path{fill:#333;stroke:#333;}#mermaid-svg-X2LkTDnqx7NhOkvm .messageText{fill:#333;stroke:none;}#mermaid-svg-X2LkTDnqx7NhOkvm .labelBox{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-X2LkTDnqx7NhOkvm .labelText,#mermaid-svg-X2LkTDnqx7NhOkvm .labelText>tspan{fill:black;stroke:none;}#mermaid-svg-X2LkTDnqx7NhOkvm .loopText,#mermaid-svg-X2LkTDnqx7NhOkvm .loopText>tspan{fill:black;stroke:none;}#mermaid-svg-X2LkTDnqx7NhOkvm .loopLine{stroke-width:2px;stroke-dasharray:2,2;stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-X2LkTDnqx7NhOkvm .note{stroke:#aaaa33;fill:#fff5ad;}#mermaid-svg-X2LkTDnqx7NhOkvm .noteText,#mermaid-svg-X2LkTDnqx7NhOkvm .noteText>tspan{fill:black;stroke:none;}#mermaid-svg-X2LkTDnqx7NhOkvm .activation0{fill:#f4f4f4;stroke:#666;}#mermaid-svg-X2LkTDnqx7NhOkvm .activation1{fill:#f4f4f4;stroke:#666;}#mermaid-svg-X2LkTDnqx7NhOkvm .activation2{fill:#f4f4f4;stroke:#666;}#mermaid-svg-X2LkTDnqx7NhOkvm .actorPopupMenu{position:absolute;}#mermaid-svg-X2LkTDnqx7NhOkvm .actorPopupMenuPanel{position:absolute;fill:#ECECFF;box-shadow:0px 8px 16px 0px rgba(0,0,0,0.2);filter:drop-shadow(3px 5px 2px rgb(0 0 0 \/ 0.4));}#mermaid-svg-X2LkTDnqx7NhOkvm .actor-man line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-X2LkTDnqx7NhOkvm .actor-man circle,#mermaid-svg-X2LkTDnqx7NhOkvm line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;stroke-width:2px;}#mermaid-svg-X2LkTDnqx7NhOkvm :root{–mermaid-font-family:\\”trebuchet ms\\”,verdana,arial,sans-serif;}\u7ebf\u7a0b2\u7acb\u523b\u83b7\u53d6\u9501💥 \u7528\u6237\u8d85\u9886！\u5f00\u542f\u4e8b\u52a1\u83b7\u53d6\u9501 \u2705\u7edf\u8ba1\u5df2\u9886\u6570\u91cf \u2192 0INSERT \u7528\u6237\u5238\u8bb0\u5f55\u91ca\u653e\u9501\u4e8b\u52a1\u5c1a\u672a\u63d0\u4ea4！\u7edf\u8ba1\u5df2\u9886\u6570\u91cf \u2192 0（\u8bfb\u4e0d\u5230\u672a\u63d0\u4ea4\u6570\u636e）INSERT \u53c8\u4e00\u6761\u7528\u6237\u5238\u8bb0\u5f55\u63d0\u4ea4\u4e8b\u52a1\u63d0\u4ea4\u4e8b\u52a1<\/p>\n

\u8fd9\u5f20\u56fe\u8bf4\u7684\u662f\u4e8b\u52a1\u8fb9\u754c\u548c\u9501\u8fb9\u754c\u4e0d\u4e00\u81f4\u5bfc\u81f4\u7684\u95ee\u9898：\u9501\u5728\u4e8b\u52a1\u5185\u90e8，\u91ca\u653e\u9501\u65f6\u4e8b\u52a1\u8fd8\u6ca1\u63d0\u4ea4，\u4e0b\u4e00\u4e2a\u7ebf\u7a0b\u8bfb\u4e0d\u5230\u672a\u63d0\u4ea4\u7684\u6570\u636e\u3002<\/p>\n

\u89e3\u51b3\u65b9\u6848：\u9501\u5305\u4e8b\u52a1，\u4e0d\u662f\u4e8b\u52a1\u5305\u9501<\/h4>\n

\u6838\u5fc3\u539f\u5219\u5c31\u4e00\u53e5\u8bdd：\u5148\u83b7\u53d6\u9501，\u518d\u5f00\u542f\u4e8b\u52a1；\u5148\u63d0\u4ea4\u4e8b\u52a1，\u518d\u91ca\u653e\u9501\u3002<\/p>\n

\u5177\u4f53\u505a\u6cd5\u662f\u628a @Transactional \u4ece\u5916\u5c42\u65b9\u6cd5\u79fb\u5230\u5185\u5c42\u7684 checkAndCreateUserCoupon \u65b9\u6cd5\u4e0a：<\/p>\n

\/\/ \u5916\u5c42\u65b9\u6cd5：\u4e0d\u52a0\u4e8b\u52a1，\u5148\u52a0\u9501<\/span>
\npublic<\/span> void<\/span> receiveCoupon<\/span>(<\/span>Long<\/span> couponId)<\/span> {<\/span>
\n \/\/ … \u67e5\u8be2\u4f18\u60e0\u5238\u3001\u6821\u9a8c\u65f6\u95f4\u3001\u6821\u9a8c\u5e93\u5b58 …<\/span><\/p>\n

\/\/ \u5728\u4e8b\u52a1\u4e4b\u5916\u52a0\u9501<\/span>
\n synchronized<\/span>(<\/span>userId.<\/span>toString<\/span>(<\/span>)<\/span>.<\/span>intern<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
\n checkAndCreateUserCoupon<\/span>(<\/span>coupon,<\/span> userId,<\/span> null<\/span>)<\/span>;<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

\/\/ \u5185\u5c42\u65b9\u6cd5：\u52a0\u4e8b\u52a1<\/span>
\n@Transactional<\/span>
\npublic<\/span> void<\/span> checkAndCreateUserCoupon<\/span>(<\/span>Coupon<\/span> coupon,<\/span> Long<\/span> userId,<\/span> Integer<\/span> serialNum)<\/span> {<\/span>
\n \/\/ \u7edf\u8ba1\u5df2\u9886\u6570\u91cf \u2192 \u5224\u65ad \u2192 \u65b0\u589e\u7528\u6237\u5238<\/span>
\n}<\/span><\/p>\n

\u6267\u884c\u987a\u5e8f\u53d8\u6210\u4e86：<\/p>\n

\u83b7\u53d6\u9501 \u2192 \u5f00\u542f\u4e8b\u52a1 \u2192 \u7edf\u8ba1 \u2192 \u5224\u65ad \u2192 \u65b0\u589e \u2192 \u63d0\u4ea4\u4e8b\u52a1 \u2192 \u91ca\u653e\u9501<\/p>\n

\u4e8b\u52a1\u5728\u9501\u7684\u4fdd\u62a4\u8303\u56f4\u5185\u5b8c\u6210，\u63d0\u4ea4\u540e\u624d\u91ca\u653e\u9501，\u4e0b\u4e00\u4e2a\u7ebf\u7a0b\u4e00\u5b9a\u80fd\u8bfb\u5230\u6700\u65b0\u6570\u636e\u3002<\/p>\n

\u56db\u3001\u7b2c\u56db\u9897\u70b8\u5f39：\u4e8b\u52a1\u5931\u6548\u2014\u2014\u975e\u4e8b\u52a1\u65b9\u6cd5\u8c03\u7528\u4e8b\u52a1\u65b9\u6cd5<\/h3>\n

\u8fb9\u754c\u6539\u597d\u4e86，\u5e76\u53d1\u5b89\u5168\u7ec8\u4e8e\u89e3\u51b3\u4e86\u3002\u4f46\u6d4b\u8bd5\u65f6\u968f\u624b\u5728\u4e1a\u52a1\u672b\u5c3e\u629b\u4e86\u4e2a\u5f02\u5e38，\u53d1\u73b0\u5e93\u5b58\u548c\u7528\u6237\u5238\u90fd\u6ca1\u56de\u6eda\u2014\u2014\u4e8b\u52a1\u5931\u6548\u4e86\u3002<\/p>\n

\u539f\u56e0\u5c31\u85cf\u5728\u521a\u624d\u7684\u6539\u9020\u91cc：receiveCoupon \u6ca1\u6709 @Transactional，\u5b83\u8c03\u7528\u4e86\u6709 @Transactional \u7684 checkAndCreateUserCoupon\u3002Spring \u7684\u4e8b\u52a1\u662f\u57fa\u4e8e AOP \u52a8\u6001\u4ee3\u7406\u5b9e\u73b0\u7684，\u7c7b\u5185\u90e8\u7684\u65b9\u6cd5\u8c03\u7528\u8d70\u7684\u662f this，\u4e0d\u7ecf\u8fc7\u4ee3\u7406\u5bf9\u8c61，\u6240\u4ee5\u4e8b\u52a1\u6ce8\u89e3\u6839\u672c\u4e0d\u4f1a\u751f\u6548\u3002<\/p>\n

\u4e8b\u52a1\u5931\u6548\u7684\u516d\u79cd\u5e38\u89c1\u539f\u56e0<\/h4>\n\n\u539f\u56e0\u8bf4\u660e<\/tr>\n\n\n\n\n\n\n\n
\u4e8b\u52a1\u65b9\u6cd5\u975e public<\/td>\nSpring \u9ed8\u8ba4\u53ea\u4ee3\u7406 public \u65b9\u6cd5<\/td>\n<\/tr>\n
\u975e\u4e8b\u52a1\u65b9\u6cd5\u8c03\u7528\u4e8b\u52a1\u65b9\u6cd5<\/td>\n\u7c7b\u5185\u90e8\u8c03\u7528\u8d70 this，\u4e0d\u7ecf\u8fc7\u4ee3\u7406\u5bf9\u8c61<\/td>\n<\/tr>\n
\u5f02\u5e38\u88ab try-catch \u541e\u4e86<\/td>\nSpring \u611f\u77e5\u4e0d\u5230\u5f02\u5e38，\u4e0d\u4f1a\u56de\u6eda<\/td>\n<\/tr>\n
\u5f02\u5e38\u7c7b\u578b\u4e0d\u5339\u914d<\/td>\n\u9ed8\u8ba4\u53ea\u56de\u6eda RuntimeException，IOException \u9700\u8981\u6307\u5b9a rollbackFor<\/td>\n<\/tr>\n
\u4f20\u64ad\u884c\u4e3a\u914d\u7f6e\u9519\u8bef<\/td>\nREQUIRES_NEW \u4f1a\u521b\u5efa\u72ec\u7acb\u4e8b\u52a1，\u5916\u90e8\u56de\u6eda\u4e0d\u5f71\u54cd\u5b83<\/td>\n<\/tr>\n
Bean \u672a\u88ab Spring \u7ba1\u7406<\/td>\n\u5fd8\u4e86\u52a0 @Service，\u4ee3\u7406\u5bf9\u8c61\u6839\u672c\u4e0d\u5b58\u5728<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u6211\u4eec\u8e29\u7684\u662f\u7b2c\u4e8c\u79cd\u3002\u89e3\u51b3\u65b9\u6848\u662f\u8ba9\u8c03\u7528\u8d70\u4ee3\u7406\u5bf9\u8c61，\u800c\u4e0d\u662f this\u3002<\/p>\n

AspectJ \u66b4\u9732\u4ee3\u7406\u5bf9\u8c61<\/h4>\n

\/\/ 1. \u542f\u52a8\u7c7b\u52a0\u6ce8\u89e3，\u66b4\u9732\u4ee3\u7406\u5bf9\u8c61<\/span>
\n@EnableAspectJAutoProxy<\/span>(<\/span>exposeProxy =<\/span> true<\/span>)<\/span><\/p>\n

\/\/ 2. \u5728\u4ee3\u7801\u4e2d\u83b7\u53d6\u4ee3\u7406\u5bf9\u8c61\u6765\u8c03\u7528\u4e8b\u52a1\u65b9\u6cd5<\/span>
\npublic<\/span> void<\/span> receiveCoupon<\/span>(<\/span>Long<\/span> couponId)<\/span> {<\/span>
\n \/\/ …<\/span>
\n synchronized<\/span>(<\/span>userId.<\/span>toString<\/span>(<\/span>)<\/span>.<\/span>intern<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
\n \/\/ \u4e0d\u8d70 this，\u8d70 Spring \u4ee3\u7406\u5bf9\u8c61<\/span>
\n IUserCouponService<\/span> proxy =<\/span> (<\/span>IUserCouponService<\/span>)<\/span> AopContext<\/span>.<\/span>currentProxy<\/span>(<\/span>)<\/span>;<\/span>
\n proxy.<\/span>checkAndCreateUserCoupon<\/span>(<\/span>coupon,<\/span> userId,<\/span> null<\/span>)<\/span>;<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

AopContext.currentProxy() \u8fd4\u56de\u7684\u662f Spring \u4e3a\u5f53\u524d Bean \u521b\u5efa\u7684\u4ee3\u7406\u5bf9\u8c61\u3002\u901a\u8fc7\u4ee3\u7406\u5bf9\u8c61\u8c03\u7528\u65b9\u6cd5，@Transactional \u7684 AOP \u589e\u5f3a\u624d\u4f1a\u751f\u6548\u3002<\/p>\n

\u4e94\u3001BitMap \u9632\u91cd\u5151：\u5151\u6362\u7801\u573a\u666f\u7684\u7279\u6b8a\u5904\u7406<\/h3>\n

\u624b\u52a8\u9886\u5238\u7528\u4e50\u89c2\u9501\u89e3\u51b3\u4e86\u8d85\u5356，\u4f46\u5151\u6362\u7801\u5151\u6362\u8fd8\u6709\u4e00\u4e2a\u989d\u5916\u7684\u95ee\u9898：\u600e\u4e48\u9632\u6b62\u540c\u4e00\u4e2a\u5151\u6362\u7801\u88ab\u5151\u6362\u4e24\u6b21？<\/p>\n

\u9879\u76ee\u91cc\u590d\u7528\u4e86\u4e4b\u524d\u7b7e\u5230\u535a\u5ba2\u8bb2\u8fc7\u7684 BitMap\u3002\u5151\u6362\u7801\u7684 ID \u662f\u81ea\u589e\u5e8f\u5217\u53f7，\u6bcf\u4e2a ID \u5bf9\u5e94 BitMap \u4e2d\u7684\u4e00\u4e2a bit \u4f4d\u3002\u5151\u6362\u65f6\u8c03\u7528 SETBIT，\u901a\u8fc7\u8fd4\u56de\u503c\u5224\u65ad\u4e4b\u524d\u662f 0 \u8fd8\u662f 1：<\/p>\n

\/\/ SETBIT \u8fd4\u56de\u4fee\u6539\u524d\u7684\u503c<\/span>
\n\/\/ \u5982\u679c\u8fd4\u56de true，\u8bf4\u660e\u4e4b\u524d\u5df2\u7ecf\u662f 1，\u5df2\u7ecf\u5151\u6362\u8fc7\u4e86<\/span>
\nboolean<\/span> exchanged =<\/span> redisTemplate.<\/span>opsForValue<\/span>(<\/span>)<\/span>
\n .<\/span>setBit<\/span>(<\/span>COUPON_CODE_MAP_KEY<\/span>,<\/span> serialNum,<\/span> true<\/span>)<\/span>;<\/span>
\nif<\/span> (<\/span>exchanged)<\/span> {<\/span>
\n throw<\/span> new<\/span> BizIllegalException<\/span>(<\/span>"\u5151\u6362\u7801\u5df2\u7ecf\u88ab\u5151\u6362\u8fc7\u4e86"<\/span>)<\/span>;<\/span>
\n}<\/span><\/p>\n

\u5982\u679c\u540e\u7eed\u4e1a\u52a1\u51fa\u9519（\u6bd4\u5982\u4f18\u60e0\u5238\u8fc7\u671f\u3001\u5e93\u5b58\u4e0d\u8db3），\u9700\u8981\u628a bit \u4f4d\u91cd\u7f6e\u4e3a 0：<\/p>\n

try<\/span> {<\/span>
\n \/\/ … \u67e5\u8be2\u5151\u6362\u7801\u3001\u6821\u9a8c\u4f18\u60e0\u5238\u3001\u751f\u6210\u7528\u6237\u5238 …<\/span>
\n}<\/span> catch<\/span> (<\/span>Exception<\/span> e)<\/span> {<\/span>
\n \/\/ \u4e1a\u52a1\u5931\u8d25，\u91cd\u7f6e\u5151\u6362\u6807\u8bb0<\/span>
\n redisTemplate.<\/span>opsForValue<\/span>(<\/span>)<\/span>.<\/span>setBit<\/span>(<\/span>COUPON_CODE_MAP_KEY<\/span>,<\/span> serialNum,<\/span> false<\/span>)<\/span>;<\/span>
\n throw<\/span> e;<\/span>
\n}<\/span><\/p>\n

\u6574\u4e2a\u8fc7\u7a0b\u4e0d\u67e5\u6570\u636e\u5e93，O(1) \u5224\u65ad\u5151\u6362\u72b6\u6001\u3002<\/p>\n

\u516d\u3001\u9762\u8bd5\u600e\u4e48\u8bf4<\/h3>\n

\u9762\u8bd5\u5b98\u95ee"\u5982\u4f55\u89e3\u51b3\u4f18\u60e0\u5238\u8d85\u53d1\u95ee\u9898"，\u5efa\u8bae\u5206\u4e24\u5c42\u56de\u7b54：\u5148\u8bf4\u5e93\u5b58\u8d85\u5356\u7528\u4e50\u89c2\u9501（WHERE issue_num < total_num），\u518d\u8bf4\u9650\u9886\u6570\u91cf\u7528\u60b2\u89c2\u9501（synchronized + intern）\u3002<\/p>\n

\u5982\u679c\u9762\u8bd5\u5b98\u8ffd\u95ee"\u52a0\u4e86\u9501\u4f46\u5e76\u53d1\u95ee\u9898\u4f9d\u7136\u5b58\u5728"，\u5c31\u8bb2\u4e8b\u52a1\u8fb9\u754c\u7684\u6545\u4e8b：\u9501\u5728\u4e8b\u52a1\u5185\u90e8，\u91ca\u653e\u9501\u65f6\u4e8b\u52a1\u8fd8\u6ca1\u63d0\u4ea4，\u4e0b\u4e00\u4e2a\u7ebf\u7a0b\u8bfb\u4e0d\u5230\u672a\u63d0\u4ea4\u6570\u636e\u3002\u89e3\u51b3\u65b9\u6848\u662f\u9501\u5305\u4e8b\u52a1\u2014\u2014\u5148\u62ff\u9501\u518d\u5f00\u4e8b\u52a1，\u5148\u63d0\u4ea4\u4e8b\u52a1\u518d\u91ca\u653e\u9501\u3002<\/p>\n

\u5982\u679c\u7ee7\u7eed\u8ffd\u95ee"\u4e8b\u52a1\u5931\u6548\u600e\u4e48\u6392\u67e5"，\u5c31\u628a\u516d\u79cd\u539f\u56e0\u5217\u51fa\u6765，\u91cd\u70b9\u8bb2"\u975e\u4e8b\u52a1\u65b9\u6cd5\u8c03\u7528\u4e8b\u52a1\u65b9\u6cd5"\u8fd9\u4e2a\u573a\u666f\u548c AopContext.currentProxy() \u7684\u89e3\u51b3\u65b9\u6848\u3002\u80fd\u8bb2\u6e05\u695a\u8fd9\u4e2a\u94fe\u8def，\u8bf4\u660e\u5bf9 Spring AOP \u7684\u4ee3\u7406\u673a\u5236\u6709\u771f\u6b63\u7406\u89e3\u3002<\/p>\n

\u4e03\u3001\u8fd9\u5468\u7684\u6574\u4f53\u611f\u53d7<\/h3>\n

\u56db\u4e2a\u5751\u62c6\u4e0b\u6765，\u6700\u5927\u7684\u611f\u89e6\u662f：\u5e76\u53d1\u5b89\u5168\u548c\u4e8b\u52a1\u8fd9\u4e24\u4e2a\u4e1c\u897f，\u5355\u72ec\u770b\u90fd\u80fd\u7406\u89e3，\u53e0\u5728\u4e00\u8d77\u5c31\u662f\u53e6\u4e00\u56de\u4e8b\u4e86\u3002\u4e50\u89c2\u9501\u89e3\u51b3\u8d85\u5356\u3001synchronized \u89e3\u51b3\u9650\u9886，\u8fd9\u4e9b\u90fd\u4e0d\u96be\u3002\u96be\u7684\u662f\u53d1\u73b0"\u9501\u52a0\u4e86\u4f46\u6ca1\u751f\u6548"\u3001"\u4e8b\u52a1\u52a0\u4e86\u4f46\u6ca1\u56de\u6eda"\u8fd9\u79cd\u9690\u853d\u95ee\u9898\u3002<\/p>\n

\u62c6\u95ee\u9898\u7684\u8fc7\u7a0b\u8ba9\u6211\u517b\u6210\u4e86\u4e00\u4e2a\u4e60\u60ef：\u5199\u5b8c\u4ee3\u7801\u540e，\u5148\u753b\u4e00\u4e0b\u6267\u884c\u65f6\u5e8f\u56fe，\u628a\u7ebf\u7a0b\u7684\u83b7\u53d6\u9501\/\u91ca\u653e\u9501\u3001\u4e8b\u52a1\u7684\u5f00\u542f\/\u63d0\u4ea4\u6807\u5728\u65f6\u95f4\u8f74\u4e0a，\u770b\u770b\u6709\u6ca1\u6709\u4ea4\u53c9\u3002\u5982\u679c\u9501\u7684\u8fb9\u754c\u548c\u4e8b\u52a1\u7684\u8fb9\u754c\u6709\u4ea4\u53c9，\u5c31\u4e00\u5b9a\u6709\u95ee\u9898\u3002<\/p>\n

\u53e6\u4e00\u4e2a\u6536\u83b7\u662f\u5bf9 Spring AOP \u4ee3\u7406\u673a\u5236\u7684\u7406\u89e3\u3002\u4ee5\u524d\u53ea\u77e5\u9053 @Transactional \u52a0\u4e86\u5c31\u6709\u4e8b\u52a1，\u73b0\u5728\u77e5\u9053\u4e86\u4e8b\u52a1\u662f\u901a\u8fc7\u4ee3\u7406\u5bf9\u8c61\u5b9e\u73b0\u7684，\u7c7b\u5185\u90e8\u8c03\u7528\u4e0d\u8d70\u4ee3\u7406\u5c31\u4f1a\u5931\u6548\u3002\u8fd9\u79cd"\u77e5\u9053\u539f\u7406\u624d\u80fd\u6392\u67e5\u95ee\u9898"\u7684\u611f\u89c9，\u8ddf\u4e4b\u524d\u505a\u5151\u6362\u7801\u7b97\u6cd5\u65f6\u7684\u611f\u53d7\u662f\u4e00\u6837\u7684\u3002<\/p>\n

\u4e0b\u5468\u51c6\u5907\u505a\u4f18\u60e0\u5238\u7684\u53e0\u52a0\u63a8\u8350\u548c\u4f18\u60e0\u91d1\u989d\u8ba1\u7b97，\u636e\u8bf4\u903b\u8f91\u66f4\u590d\u6742\u3002\u7ee7\u7eed\u52a0\u6cb9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u4e0a\u4e00\u7bc7\u535a\u5ba2\u5199\u4e86\u4f18\u60e0\u5238\u7ba1\u7406\u548c\u5151\u6362\u7801\u7b97\u6cd5，\u8fd9\u5468\u7ee7\u7eed\u5f80\u4e0b\u505a\u2014\u2014\u7528\u6237\u9886\u5238\u3002\u529f\u80fd\u672c\u8eab\u4e0d\u590d\u6742：\u67e5\u5238\u3001\u6821\u9a8c\u3001\u63d2\u5165\u7528\u6237\u5238\u8bb0\u5f55\u3001\u6263\u51cf\u5e93\u5b58\u3002\u4f46\u7528 JMeter \u4e00\u8dd1\u5e76\u53d1\u6d4b\u8bd5\u5c31\u70b8\u4e86：100 \u4e2a\u5e93\u5b58\u53d1\u4e86 109 \u5f20\u5238，\u7528\u6237\u9650\u9886 2 \u5f20\u7ed3\u679c\u9886\u4e86 4 \u5f20，\u52a0\u4e86\u9501\u6ca1\u7528，\u52a0\u4e86\u4e8b\u52a1\u4e5f\u6ca1\u7528\u3002\u524d\u524d\u540e\u540e\u6539\u4e86\u56db\u8f6e，\u6bcf\u4e00\u8f6e\u89e3\u51b3\u4e00\u4e2a\u95ee\u9898，\u540c\u65f6\u5f15\u51fa\u4e0b\u4e00\u4e2a\u95ee\u9898\u3002\u6574\u4e2a\u8fc7\u7a0b\u50cf\u62c6\u8fde\u73af\u70b8\u5f39，\u526a\u4e86\u4e00\u6839\u7ebf\u7ed3\u679c\u65c1\u8fb9<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[11653,99,604,190,100,3433],"topic":[],"class_list":["post-104131","post","type-post","status-publish","format-standard","hentry","category-server","tag-11653","tag-java","tag-oracle","tag-190","tag-100","tag-3433"],"yoast_head":"\n\u9886\u5238\u529f\u80fd\u8e29\u4e86\u56db\u4e2a\u5751\uff1a\u8d85\u5356\u3001\u9501\u5931\u6548\u3001\u4e8b\u52a1\u5931\u6548\u3001\u4ee3\u7406\u5bf9\u8c61\u4e22\u5931\uff0c\u6bcf\u4e2a\u5751\u80cc\u540e\u90fd\u662f\u4e00\u7c7b\u7ecf\u5178\u95ee\u9898 - 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