{"id":122263,"date":"2026-11-04T13:32:52","date_gmt":"2026-11-04T05:32:52","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/122263.html"},"modified":"2026-11-04T13:32:52","modified_gmt":"2026-11-04T05:32:52","slug":"scoped-values-%e5%ae%9e%e6%88%98%ef%bc%9ajava-25-%e5%a6%82%e4%bd%95%e6%9b%bf%e4%bb%a3-threadlocal-%e4%bc%a0%e9%80%92%e8%af%b7%e6%b1%82%e4%b8%8a%e4%b8%8b%e6%96%87","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/122263.html","title":{"rendered":"Scoped Values \u5b9e\u6218\uff1aJava 25 \u5982\u4f55\u66ff\u4ee3 ThreadLocal \u4f20\u9012\u8bf7\u6c42\u4e0a\u4e0b\u6587"},"content":{"rendered":"

Scoped Values \u5b9e\u6218：Java 25 \u5982\u4f55\u66ff\u4ee3 ThreadLocal \u4f20\u9012\u8bf7\u6c42\u4e0a\u4e0b\u6587<\/h2>\n

\u5728\u4e00\u4e2a Web \u8bf7\u6c42\u4e2d，\u94fe\u8def\u8ffd\u8e2a ID\u3001\u5f53\u524d\u7528\u6237\u3001\u79df\u6237\u4fe1\u606f\u7b49\u4e0a\u4e0b\u6587，\u7ecf\u5e38\u9700\u8981\u7a7f\u8fc7\u591a\u5c42\u65b9\u6cd5，\u6700\u7ec8\u5230\u8fbe\u65e5\u5fd7\u3001\u6570\u636e\u8bbf\u95ee\u6216\u8fdc\u7a0b\u8c03\u7528\u7ec4\u4ef6\u3002<\/p>\n

\u5982\u679c\u6bcf\u4e00\u5c42\u90fd\u663e\u5f0f\u589e\u52a0\u53c2\u6570，\u65b9\u6cd5\u7b7e\u540d\u4f1a\u8fc5\u901f\u88ab\u8fd9\u4e9b\u201c\u65c1\u89c2\u8005\u53c2\u6570\u201d\u5360\u9886；\u5982\u679c\u4f7f\u7528 ThreadLocal，\u53c8\u8981\u9762\u5bf9\u7ebf\u7a0b\u6c60\u6c61\u67d3\u3001\u5fd8\u8bb0\u6e05\u7406\u3001\u5d4c\u5957\u8986\u76d6\u548c\u8de8\u7ebf\u7a0b\u4f20\u9012\u7b49\u95ee\u9898\u3002<\/p>\n

Java 25 \u6b63\u5f0f\u53d1\u5e03\u7684 Scoped Values，\u4e3a\u5176\u4e2d\u4e00\u7c7b\u95ee\u9898\u63d0\u4f9b\u4e86\u66f4\u6e05\u6670\u7684\u6a21\u578b：\u5728\u4e00\u6bb5\u6709\u660e\u786e\u8fb9\u754c\u7684\u6267\u884c\u8fc7\u7a0b\u4e2d，\u628a\u4e0d\u53d8\u7684\u4e0a\u4e0b\u6587\u4ece\u8c03\u7528\u8005\u5355\u5411\u4f20\u7ed9\u88ab\u8c03\u7528\u8005\u3002<\/p>\n

\u5b83\u4e0d\u662f\u7ed9 ThreadLocal \u589e\u52a0\u51e0\u4e2a\u65b0\u65b9\u6cd5，\u4e5f\u4e0d\u662f\u4e00\u79cd\u53ef\u4ee5\u968f\u610f\u8bfb\u5199\u7684\u5168\u5c40\u4e0a\u4e0b\u6587\u5bb9\u5668\u3002\u5b83\u771f\u6b63\u6539\u53d8\u7684\u662f\u4e0a\u4e0b\u6587\u7684\u751f\u547d\u5468\u671f\u548c\u6570\u636e\u6d41：<\/p>\n

\u7ed1\u5b9a\u4e0a\u4e0b\u6587
\n \u2193
\n\u6267\u884c\u4e00\u4e2a\u64cd\u4f5c
\n \u2193
\n\u64cd\u4f5c\u76f4\u63a5\u3001\u95f4\u63a5\u8c03\u7528\u7684\u65b9\u6cd5\u53ef\u4ee5\u8bfb\u53d6\u4e0a\u4e0b\u6587
\n \u2193
\n\u64cd\u4f5c\u6b63\u5e38\u8fd4\u56de\u6216\u629b\u51fa\u5f02\u5e38
\n \u2193
\n\u7ed1\u5b9a\u81ea\u52a8\u6d88\u5931，\u6216\u6062\u590d\u4e3a\u5916\u5c42\u7ed1\u5b9a<\/p>\n

\u672c\u6587\u4f1a\u4ece\u5b9e\u9645\u95ee\u9898\u51fa\u53d1，\u5b8c\u6574\u4ecb\u7ecd Java 25 Scoped Values \u7684 API\u3001\u52a8\u6001\u4f5c\u7528\u57df\u3001\u5d4c\u5957\u91cd\u7ed1\u5b9a\u3001\u8de8\u7ebf\u7a0b\u7ee7\u627f\u3001Spring MVC \u63a5\u5165\u3001\u6d4b\u8bd5\u65b9\u6cd5\u3001\u6027\u80fd\u8fb9\u754c\u4e0e\u8fc1\u79fb\u7b56\u7565\u3002<\/p>\n

\u7248\u672c\u8bf4\u660e：ScopedValue \u5728 Java 20 \u4e2d\u5b75\u5316，Java 21～24 \u4e2d\u9884\u89c8，Java 25 \u4e2d\u6210\u4e3a\u6b63\u5f0f API\u3002\u672c\u6587\u6838\u5fc3\u793a\u4f8b\u57fa\u4e8e Java 25\u3002\u7ed3\u6784\u5316\u5e76\u53d1\u5728 Java 25 \u4e2d\u4ecd\u662f\u9884\u89c8\u7279\u6027，\u76f8\u5173\u793a\u4f8b\u4f1a\u5355\u72ec\u6807\u6ce8，\u4e0d\u80fd\u4e0e ScopedValue \u7684\u6b63\u5f0f\u72b6\u6001\u6df7\u4e3a\u4e00\u8c08\u3002<\/p>\n

\u4e00\u3001\u5148\u8bf4\u7ed3\u8bba：\u4ec0\u4e48\u65f6\u5019\u8be5\u7528，\u4ec0\u4e48\u65f6\u5019\u4e0d\u8be5\u7528<\/h3>\n

\u5982\u679c\u53ea\u60f3\u5148\u8bb0\u4f4f\u6700\u5b9e\u7528\u7684\u5224\u65ad，\u53ef\u4ee5\u770b\u4e0b\u9762\u51e0\u6761：<\/p>\n

  • \u53ea\u8bfb\u3001\u5355\u5411\u3001\u6709\u660e\u786e\u6267\u884c\u8fb9\u754c\u7684\u4e0a\u4e0b\u6587，\u5f88\u9002\u5408\u4f7f\u7528 Scoped Value，\u4f8b\u5982\u4e00\u6b21\u8bf7\u6c42\u4e2d\u7684 traceId\u3001\u5f53\u524d\u7528\u6237\u5feb\u7167\u3001\u79df\u6237\u5feb\u7167\u3002<\/li>\n
  • Scoped Value \u7684\u751f\u547d\u5468\u671f\u7531 run \u6216 call \u7684\u6267\u884c\u8fb9\u754c\u51b3\u5b9a，\u4e0d\u9700\u8981\u624b\u52a8\u8c03\u7528 remove()\u3002<\/li>\n
  • Scoped Value \u6ca1\u6709 set()，\u5f53\u524d\u4f5c\u7528\u57df\u4e2d\u7684\u4ee3\u7801\u4e0d\u80fd\u968f\u610f\u6539\u5199\u81ea\u5df1\u7684\u7ed1\u5b9a；\u4f46\u53ef\u4ee5\u5728\u5d4c\u5957\u4f5c\u7528\u57df\u4e2d\u91cd\u65b0\u7ed1\u5b9a\u3002<\/li>\n
  • \u7ed1\u5b9a\u4e0d\u53ef\u53d8，\u4e0d\u4ee3\u8868\u7ed1\u5b9a\u5230\u7684\u5bf9\u8c61\u81ea\u52a8\u4e0d\u53ef\u53d8\u3002 \u5982\u679c\u591a\u4e2a\u7ebf\u7a0b\u5171\u4eab\u4e00\u4e2a\u53ef\u53d8\u5bf9\u8c61，\u4ecd\u7136\u9700\u8981\u4e0d\u53ef\u53d8\u8bbe\u8ba1\u6216\u540c\u6b65\u3002<\/li>\n
  • \u865a\u62df\u7ebf\u7a0b\u652f\u6301 ThreadLocal，\u4e5f\u652f\u6301 Scoped Value，\u4f46\u666e\u901a\u865a\u62df\u7ebf\u7a0b\u3001\u7ebf\u7a0b\u6c60\u4efb\u52a1\u3001CompletableFuture \u5e76\u4e0d\u4f1a\u81ea\u52a8\u7ee7\u627f Scoped Value\u3002<\/li>\n
  • Java 25 \u4e2d，\u5b98\u65b9\u660e\u786e\u7684\u8de8\u7ebf\u7a0b\u7ee7\u627f\u673a\u5236\u662f StructuredTaskScope\u3002\u7ed1\u5b9a\u5728\u6253\u5f00 task scope \u65f6\u88ab\u6355\u83b7，\u5b50\u4efb\u52a1\u4f1a\u5728\u7236\u4f5c\u7528\u57df\u9000\u51fa\u524d\u7ed3\u675f\u3002<\/li>\n
  • Scoped Value \u4e0d\u9002\u5408\u66ff\u4ee3\u6240\u6709 ThreadLocal\u3002\u6bcf\u7ebf\u7a0b\u7f13\u5b58\u3001\u53cc\u5411\u901a\u4fe1\u3001\u751f\u547d\u5468\u671f\u65e0\u6cd5\u7ed3\u6784\u5316\u7684\u6570\u636e，\u4ecd\u53ef\u80fd\u9700\u8981\u5176\u4ed6\u65b9\u6848\u3002<\/li>\n
  • \u5b83\u4e0d\u662f Spring Security\u3001SLF4J MDC\u3001Reactor Context \u7684\u81ea\u52a8\u66ff\u4ee3\u54c1\u3002\u63a5\u5165\u5df2\u6709\u6846\u67b6\u65f6，\u9700\u8981\u786e\u8ba4\u6846\u67b6\u81ea\u5df1\u7684\u4e0a\u4e0b\u6587\u4f20\u64ad\u673a\u5236\u3002<\/li>\n
  • Java 25 \u7684\u6b63\u786e\u5165\u53e3\u662f ScopedValue.where(…).run(…) \u548c where(…).call(…)\u3002\u65e9\u671f\u8d44\u6599\u4e2d\u7684 runWhere\u3001callWhere\u3001getWhere \u5df2\u4e0d\u9002\u7528\u4e8e\u6700\u7ec8 API\u3002<\/li>\n
  • \u4e0d\u8981\u4ee5\u201c\u65b0 API \u4e00\u5b9a\u66f4\u5feb\u201d\u4e3a\u8fc1\u79fb\u7406\u7531\u3002\u5148\u5224\u65ad\u6570\u636e\u6d41\u662f\u5426\u5339\u914d，\u518d\u7528\u538b\u6d4b\u9a8c\u8bc1\u5177\u4f53\u6536\u76ca\u3002<\/li>\n

    \u4e00\u5f20\u8868\u53ef\u4ee5\u5feb\u901f\u9009\u578b：<\/p>\n\n\u9700\u6c42\u66f4\u5408\u9002\u7684\u65b9\u6848<\/tr>\n\n\n\n\n\n\n\n\n
    \u5728\u4e00\u6b21\u540c\u6b65\u8bf7\u6c42\u8c03\u7528\u94fe\u4e2d\u4f20\u9012\u53ea\u8bfb\u4e0a\u4e0b\u6587<\/td>\nScoped Value<\/td>\n<\/tr>\n
    \u5728\u7ed3\u6784\u5316\u5b50\u4efb\u52a1\u4e2d\u7ee7\u627f\u53ea\u8bfb\u4e0a\u4e0b\u6587<\/td>\nScoped Value + StructuredTaskScope<\/td>\n<\/tr>\n
    \u6df1\u5c42\u65b9\u6cd5\u9700\u8981\u53cd\u5411\u4fee\u6539\u8c03\u7528\u8005\u7684\u72b6\u6001<\/td>\n\u663e\u5f0f\u8fd4\u56de\u503c\u3001\u663e\u5f0f\u53c2\u6570，\u5fc5\u8981\u65f6\u624d\u8003\u8651 ThreadLocal<\/td>\n<\/tr>\n
    \u5728\u7ebf\u7a0b\u6574\u4e2a\u751f\u547d\u5468\u671f\u5185\u7f13\u5b58\u6602\u8d35\u7684\u975e\u7ebf\u7a0b\u5b89\u5168\u5bf9\u8c61<\/td>\nThreadLocal \u6216\u66f4\u5408\u9002\u7684\u5bf9\u8c61\u6c60；\u4f18\u5148\u8003\u8651\u7ebf\u7a0b\u5b89\u5168\u66ff\u4ee3\u7c7b<\/td>\n<\/tr>\n
    Reactor \u5f02\u6b65\u6570\u636e\u6d41\u4e2d\u7684\u4e0a\u4e0b\u6587<\/td>\nReactor Context \u53ca\u6846\u67b6\u539f\u751f\u673a\u5236<\/td>\n<\/tr>\n
    \u666e\u901a\u7ebf\u7a0b\u6c60\u4e2d\u7684\u4efb\u52a1\u4e0a\u4e0b\u6587<\/td>\n\u63d0\u4ea4\u4efb\u52a1\u65f6\u663e\u5f0f\u6355\u83b7\u5e76\u91cd\u65b0\u7ed1\u5b9a，\u6216\u4f7f\u7528\u6846\u67b6\u4f20\u64ad\u7ec4\u4ef6<\/td>\n<\/tr>\n
    \u8de8\u8fdb\u7a0b\u3001\u8de8\u670d\u52a1\u4f20\u9012\u4e0a\u4e0b\u6587<\/td>\n\u6d88\u606f\u5934\u3001HTTP Header\u3001RPC \u5143\u6570\u636e\u7b49\u663e\u5f0f\u534f\u8bae<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u4e8c\u3001\u4e3a\u4ec0\u4e48\u9700\u8981\u201c\u9690\u5f0f\u65b9\u6cd5\u53c2\u6570\u201d<\/h3>\n

    2.1 \u663e\u5f0f\u53c2\u6570\u6c38\u8fdc\u662f\u9996\u9009\u57fa\u7ebf<\/h4>\n

    \u5047\u8bbe\u8ba2\u5355\u5904\u7406\u94fe\u8def\u5982\u4e0b：<\/p>\n

    OrderController
    \n \u2193
    \nOrderService
    \n \u2193
    \nOrderRepository
    \n \u2193
    \nAuditLogger<\/p>\n

    AuditLogger \u9700\u8981\u8bb0\u5f55 traceId，\u6700\u76f4\u89c2\u7684\u529e\u6cd5\u662f\u9010\u5c42\u4f20\u9012：<\/p>\n

    void<\/span> handleOrder<\/span>(<\/span>long<\/span> orderId,<\/span> String<\/span> traceId)<\/span> {<\/span>
    \n orderService.<\/span>process<\/span>(<\/span>orderId,<\/span> traceId)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    void<\/span> process<\/span>(<\/span>long<\/span> orderId,<\/span> String<\/span> traceId)<\/span> {<\/span>
    \n \/\/ \u4e2d\u95f4\u65b9\u6cd5\u672c\u8eab\u53ef\u80fd\u5b8c\u5168\u4e0d\u4f7f\u7528 traceId<\/span>
    \n auditLogger.<\/span>record<\/span>(<\/span>orderId,<\/span> traceId)<\/span>;<\/span>
    \n}<\/span><\/p>\n

    \u8fd9\u79cd\u65b9\u5f0f\u6709\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u4f18\u70b9：\u4f9d\u8d56\u6e05\u695a\u3001\u7c7b\u578b\u660e\u786e\u3001\u6d4b\u8bd5\u65b9\u4fbf\u3002<\/p>\n

    \u5982\u679c\u4e00\u4e2a\u503c\u53ea\u6709\u4e24\u4e09\u5c42\u7684\u56fa\u5b9a\u4f20\u9012\u8def\u5f84，\u6216\u8005\u5b83\u672c\u8eab\u5c31\u662f\u4e1a\u52a1\u65b9\u6cd5\u7684\u6838\u5fc3\u8f93\u5165，\u663e\u5f0f\u53c2\u6570\u901a\u5e38\u4ecd\u662f\u6700\u597d\u7684\u65b9\u6848，\u4e0d\u5fc5\u4e3a\u4e86\u4f7f\u7528\u65b0 API \u800c\u5f15\u5165\u4e0a\u4e0b\u6587\u5bb9\u5668\u3002<\/p>\n

    2.2 \u771f\u6b63\u9ebb\u70e6\u7684\u662f\u6a2a\u5207\u4e0a\u4e0b\u6587<\/h4>\n

    \u5f53\u8c03\u7528\u94fe\u5f88\u957f，\u800c\u4e14 traceId\u3001\u7528\u6237\u4fe1\u606f\u3001\u79df\u6237\u4fe1\u606f\u9700\u8981\u7ecf\u8fc7\u8bb8\u591a\u5e76\u4e0d\u5173\u5fc3\u5b83\u4eec\u7684\u65b9\u6cd5\u65f6，\u95ee\u9898\u5c31\u51fa\u73b0\u4e86：<\/p>\n

      \n
    • \u4e2d\u95f4\u65b9\u6cd5\u88ab\u8feb\u58f0\u660e\u81ea\u5df1\u5e76\u4e0d\u4f7f\u7528\u7684\u53c2\u6570；<\/li>\n
    • \u65b0\u589e\u4e00\u79cd\u4e0a\u4e0b\u6587\u4f1a\u4fee\u6539\u5927\u91cf\u65b9\u6cd5\u7b7e\u540d；<\/li>\n
    • \u6846\u67b6\u9700\u8981\u5728\u8c03\u7528\u4e1a\u52a1\u4ee3\u7801\u540e，\u518d\u4ece\u4e1a\u52a1\u56de\u8c03\u4e2d\u53d6\u5f97\u6846\u67b6\u4e0a\u4e0b\u6587；<\/li>\n
    • \u4e1a\u52a1\u5c42\u4e0e\u57fa\u7840\u8bbe\u65bd\u5c42\u56e0\u4e3a\u4e0a\u4e0b\u6587\u53c2\u6570\u4ea7\u751f\u989d\u5916\u8026\u5408\u3002<\/li>\n<\/ul>\n

      ThreadLocal \u548c Scoped Value \u90fd\u53ef\u4ee5\u5728\u8fd9\u65f6\u5145\u5f53\u4e00\u79cd\u9690\u5f0f\u65b9\u6cd5\u53c2\u6570\u3002<\/p>\n

      \u533a\u522b\u4e0d\u5728\u4e8e\u201c\u80fd\u4e0d\u80fd\u5c11\u5199\u53c2\u6570\u201d，\u800c\u5728\u4e8e\u8fd9\u4e2a\u9690\u5f0f\u53c2\u6570\u662f\u5426\u53ef\u4ee5\u88ab\u968f\u65f6\u4fee\u6539\u3001\u6d3b\u591a\u4e45，\u4ee5\u53ca\u5982\u4f55\u8fdb\u5165\u5b50\u7ebf\u7a0b\u3002<\/p>\n

      \u4e09\u3001ThreadLocal \u7684\u4e09\u4e2a\u7ed3\u6784\u6027\u95ee\u9898<\/h3>\n

      3.1 \u4f20\u7edf\u8bf7\u6c42\u4e0a\u4e0b\u6587\u5199\u6cd5<\/h4>\n

      \u5148\u7528\u4e00\u4e2a\u5178\u578b\u7684 ThreadLocal \u5b9e\u73b0\u4f5c\u4e3a\u5bf9\u7167：<\/p>\n

      public<\/span> record<\/span> RequestContext<\/span>(<\/span>String<\/span> traceId,<\/span> String<\/span> userId)<\/span> {<\/span>
      \n}<\/span><\/p>\n

      public<\/span> final<\/span> class<\/span> RequestContexts<\/span> {<\/span><\/p>\n

      private<\/span> static<\/span> final<\/span> ThreadLocal<\/span><<\/span>RequestContext<\/span>><\/span><\/span> CONTEXT<\/span> =<\/span>
      \n new<\/span> ThreadLocal<\/span><<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span><\/p>\n

      private<\/span> RequestContexts<\/span>(<\/span>)<\/span> {<\/span>
      \n }<\/span><\/p>\n

      public<\/span> static<\/span> void<\/span> set<\/span>(<\/span>RequestContext<\/span> context)<\/span> {<\/span>
      \n CONTEXT<\/span>.<\/span>set<\/span>(<\/span>context)<\/span>;<\/span>
      \n }<\/span><\/p>\n

      public<\/span> static<\/span> RequestContext<\/span> current<\/span>(<\/span>)<\/span> {<\/span>
      \n RequestContext<\/span> context =<\/span> CONTEXT<\/span>.<\/span>get<\/span>(<\/span>)<\/span>;<\/span>
      \n if<\/span> (<\/span>context ==<\/span> null<\/span>)<\/span> {<\/span>
      \n throw<\/span> new<\/span> IllegalStateException<\/span>(<\/span>"\u5f53\u524d\u7ebf\u7a0b\u6ca1\u6709\u8bf7\u6c42\u4e0a\u4e0b\u6587"<\/span>)<\/span>;<\/span>
      \n }<\/span>
      \n return<\/span> context;<\/span>
      \n }<\/span><\/p>\n

      public<\/span> static<\/span> void<\/span> clear<\/span>(<\/span>)<\/span> {<\/span>
      \n CONTEXT<\/span>.<\/span>remove<\/span>(<\/span>)<\/span>;<\/span>
      \n }<\/span>
      \n}<\/span><\/p>\n

      Web \u5165\u53e3\u901a\u5e38\u8981\u8fd9\u6837\u4f7f\u7528：<\/p>\n

      RequestContexts<\/span>.<\/span>set<\/span>(<\/span>context)<\/span>;<\/span>
      \ntry<\/span> {<\/span>
      \n handleRequest<\/span>(<\/span>)<\/span>;<\/span>
      \n}<\/span> finally<\/span> {<\/span>
      \n RequestContexts<\/span>.<\/span>clear<\/span>(<\/span>)<\/span>;<\/span>
      \n}<\/span><\/p>\n

      \u8fd9\u6bb5\u4ee3\u7801\u53ef\u4ee5\u6b63\u5e38\u5de5\u4f5c，\u4f46\u5b83\u628a\u4e09\u4ef6\u5173\u952e\u4e8b\u60c5\u4ea4\u7ed9\u4e86\u5f00\u53d1\u8005\u81ea\u89c9：<\/p>\n

        \n
      • \u8c01\u80fd\u4fee\u6539\u4e0a\u4e0b\u6587；<\/li>\n
      • \u4ec0\u4e48\u65f6\u5019\u6e05\u7406\u4e0a\u4e0b\u6587；<\/li>\n
      • \u5b50\u4efb\u52a1\u5982\u4f55\u7ee7\u627f\u4e0a\u4e0b\u6587\u3002<\/li>\n<\/ul>\n

        3.2 \u95ee\u9898\u4e00：\u53ef\u4fee\u6539\u6027\u6ca1\u6709\u8fb9\u754c<\/h4>\n

        \u4efb\u4f55\u80fd\u591f\u8bbf\u95ee CONTEXT \u7684\u4ee3\u7801，\u90fd\u53ef\u4ee5\u5728\u4efb\u610f\u4f4d\u7f6e\u8c03\u7528：<\/p>\n

        CONTEXT<\/span>.<\/span>set<\/span>(<\/span>anotherContext)<\/span>;<\/span><\/p>\n

        \u5373\u4f7f RequestContext \u662f\u4e0d\u53ef\u53d8 record，\u4e5f\u53ea\u662f\u5bf9\u8c61\u672c\u8eab\u4e0d\u53ef\u53d8，ThreadLocal \u4e2d\u7684\u5f15\u7528\u4ecd\u7136\u53ef\u4ee5\u88ab\u66ff\u6362\u3002<\/p>\n

        \u8fd9\u4f1a\u5e26\u6765\u4e24\u4e2a\u95ee\u9898：<\/p>\n

          \n
        • \u5f88\u96be\u901a\u8fc7\u4ee3\u7801\u7ed3\u6784\u5224\u65ad\u4e0a\u4e0b\u6587\u5728\u54ea\u91cc\u88ab\u6539\u53d8；<\/li>\n
        • \u6df1\u5c42\u4ee3\u7801\u53ef\u4ee5\u5f71\u54cd\u540e\u7eed\u5b8c\u5168\u4e0d\u76f8\u5173\u7684\u8c03\u7528，\u6570\u636e\u6d41\u4e0d\u518d\u53ea\u662f\u201c\u8c03\u7528\u8005\u4f20\u7ed9\u88ab\u8c03\u7528\u8005\u201d\u3002<\/li>\n<\/ul>\n

          \u5982\u679c\u4e0a\u4e0b\u6587\u6d89\u53ca\u7528\u6237\u6216\u79df\u6237\u8eab\u4efd，\u4e0d\u53d7\u7ea6\u675f\u7684\u66ff\u6362\u8fd8\u53ef\u80fd\u6210\u4e3a\u5b89\u5168\u9690\u60a3\u3002<\/p>\n

          3.3 \u95ee\u9898\u4e8c：\u751f\u547d\u5468\u671f\u4f9d\u8d56\u624b\u52a8\u6e05\u7406<\/h4>\n

          \u4e0b\u9762\u4ee3\u7801\u5c11\u4e86 finally：<\/p>\n

          RequestContexts<\/span>.<\/span>set<\/span>(<\/span>context)<\/span>;<\/span>
          \nhandleRequest<\/span>(<\/span>)<\/span>;<\/span>
          \nRequestContexts<\/span>.<\/span>clear<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

          \u4e00\u65e6 handleRequest() \u629b\u51fa\u5f02\u5e38，\u6e05\u7406\u5c31\u4e0d\u4f1a\u6267\u884c\u3002<\/p>\n

          \u5373\u4f7f\u5199\u4e86 try\/finally，\u5c01\u88c5\u4e0d\u5f53\u3001\u5f02\u6b65\u8fb9\u754c\u590d\u6742\u6216\u9057\u6f0f\u5165\u53e3，\u4ecd\u7136\u53ef\u80fd\u7559\u4e0b\u65e7\u503c\u3002<\/p>\n

          \u5728\u56fa\u5b9a\u7ebf\u7a0b\u6c60\u4e2d，\u5de5\u4f5c\u7ebf\u7a0b\u4f1a\u88ab\u591a\u4e2a\u4efb\u52a1\u590d\u7528：<\/p>\n

          \u4efb\u52a1 A：\u7ed1\u5b9a\u7528\u6237 A \u7684\u4e0a\u4e0b\u6587
          \n\u4efb\u52a1 A：\u5f02\u5e38\u7ed3\u675f，\u6ca1\u6709\u6e05\u7406
          \n\u4efb\u52a1 B：\u590d\u7528\u540c\u4e00\u7ebf\u7a0b
          \n\u4efb\u52a1 B：\u67d0\u6bb5\u4ee3\u7801\u5fd8\u8bb0\u521d\u59cb\u5316\u4e0a\u4e0b\u6587，\u5374\u8bfb\u5230\u4e86\u7528\u6237 A<\/p>\n

          \u8fd9\u65e2\u53ef\u80fd\u4ea7\u751f\u9519\u8bef\u65e5\u5fd7，\u4e5f\u53ef\u80fd\u9020\u6210\u8d8a\u6743\u6216\u6570\u636e\u4e32\u79df\u6237\u3002<\/p>\n

          \u957f\u671f\u4e0d\u6e05\u7406\u8fd8\u4f1a\u8ba9\u7ebf\u7a0b\u7ee7\u7eed\u6301\u6709\u4e0a\u4e0b\u6587\u5bf9\u8c61\u53ca\u5176\u5f15\u7528\u56fe，\u5ef6\u8fdf\u5783\u573e\u56de\u6536\u3002<\/p>\n

          \u9700\u8981\u8865\u5145\u4e00\u4e2a\u8fb9\u754c：\u5728\u201c\u4e00\u8bf7\u6c42\u4e00\u4e2a\u77ed\u547d\u865a\u62df\u7ebf\u7a0b\u201d\u7684\u6a21\u578b\u4e2d，\u7ebf\u7a0b\u7ed3\u675f\u4f1a\u91ca\u653e\u5176 ThreadLocal \u6570\u636e，\u56e0\u6b64\u957f\u671f\u7ebf\u7a0b\u6c60\u6c61\u67d3\u7684\u95ee\u9898\u4f1a\u51cf\u8f7b\u3002 \u4f46\u8fd9\u5e76\u6ca1\u6709\u89e3\u51b3\u4efb\u610f\u4fee\u6539\u3001\u7ee7\u627f\u6210\u672c\u548c\u5f02\u6b65\u4f20\u64ad\u95ee\u9898，\u4e5f\u4e0d\u80fd\u6210\u4e3a\u7701\u7565\u6e05\u7406\u7684\u901a\u7528\u7406\u7531\u3002<\/p>\n

          3.4 \u95ee\u9898\u4e09：\u53ef\u7ee7\u627f\u4e0d\u7b49\u4e8e\u4f4e\u6210\u672c\u3001\u53ef\u63a7\u5236<\/h4>\n

          InheritableThreadLocal \u53ef\u4ee5\u5728\u521b\u5efa\u5b50\u7ebf\u7a0b\u65f6\u590d\u5236\u7236\u7ebf\u7a0b\u7684\u53ef\u7ee7\u627f\u503c，\u4f46\u5b83\u6709\u51e0\u4e2a\u9650\u5236：<\/p>\n

            \n
          • \u7ee7\u627f\u53d1\u751f\u5728\u5b50\u7ebf\u7a0b\u521b\u5efa\u65f6，\u4e0d\u662f\u4efb\u52a1\u63d0\u4ea4\u65f6；<\/li>\n
          • \u5df2\u7ecf\u5b58\u5728\u7684\u6c60\u5316\u5de5\u4f5c\u7ebf\u7a0b\u4e0d\u4f1a\u56e0\u4e3a\u6536\u5230\u65b0\u4efb\u52a1\u800c\u91cd\u65b0\u7ee7\u627f；<\/li>\n
          • \u521b\u5efa\u5b50\u7ebf\u7a0b\u9700\u8981\u5904\u7406\u7236\u7ebf\u7a0b\u4e2d\u7684\u53ef\u7ee7\u627f ThreadLocal \u6570\u636e；<\/li>\n
          • \u7236\u5b50\u7ebf\u7a0b\u62ff\u5230\u7684\u662f\u5404\u81ea\u53ef\u4fee\u6539\u7684\u7ed1\u5b9a，\u4e0d\u662f\u4e00\u5957\u6709\u7edf\u4e00\u751f\u547d\u5468\u671f\u7684\u53ea\u8bfb\u7ed1\u5b9a\u3002<\/li>\n<\/ul>\n

            \u56e0\u6b64，\u4e0b\u9762\u8fd9\u79cd\u60f3\u6cd5\u901a\u5e38\u662f\u9519\u8bef\u7684：<\/p>\n

            \u7236\u7ebf\u7a0b\u5df2\u7ecf\u8bbe\u7f6e InheritableThreadLocal
            \n \u2193
            \n\u5411\u56fa\u5b9a\u7ebf\u7a0b\u6c60\u63d0\u4ea4\u4efb\u52a1
            \n \u2193
            \n\u6c60\u4e2d\u7684\u65e7\u7ebf\u7a0b\u81ea\u52a8\u770b\u5230\u7236\u7ebf\u7a0b\u7684\u65b0\u503c<\/p>\n

            \u56fa\u5b9a\u7ebf\u7a0b\u6c60\u7684\u7ebf\u7a0b\u5f80\u5f80\u65e9\u5df2\u521b\u5efa，\u4efb\u52a1\u63d0\u4ea4\u4e0e\u7ebf\u7a0b\u521b\u5efa\u4e0d\u662f\u540c\u4e00\u65f6\u523b\u3002<\/p>\n

            \u56db\u3001Scoped Value \u7684\u6838\u5fc3\u6a21\u578b<\/h3>\n

            4.1 \u5b83\u4e0d\u662f\u201c\u53ea\u80fd set \u4e00\u6b21\u7684 ThreadLocal\u201d<\/h4>\n

            Scoped Value \u66f4\u51c6\u786e\u7684\u5b9a\u4e49\u662f：<\/p>\n

            \u4e00\u4e2a\u53ef\u4ee5\u5728\u5f53\u524d\u7ebf\u7a0b\u7684\u67d0\u6bb5\u52a8\u6001\u4f5c\u7528\u57df\u4e2d\u7ed1\u5b9a\u503c，\u5e76\u8ba9\u8fd9\u6bb5\u6267\u884c\u4e2d\u7684\u76f4\u63a5\u3001\u95f4\u63a5\u88ab\u8c03\u7528\u8005\u8bfb\u53d6\u8be5\u503c\u7684\u952e\u3002<\/p>\n

            \u5b83\u6709\u4e09\u4e2a\u5173\u952e\u8bcd：<\/p>\n

              \n
            • \u7ed1\u5b9a（binding）：\u628a\u67d0\u4e2a ScopedValue \u952e\u4e0e\u4e00\u4e2a\u503c\u5173\u8054；<\/li>\n
            • \u52a8\u6001\u4f5c\u7528\u57df（dynamic scope）：\u7531\u8fd0\u884c\u65f6\u8c03\u7528\u8fc7\u7a0b\u51b3\u5b9a\u7684\u53ef\u89c1\u8303\u56f4；<\/li>\n
            • \u81ea\u52a8\u6062\u590d（revert）：\u64cd\u4f5c\u7ed3\u675f\u540e，\u7ed1\u5b9a\u6d88\u5931\u6216\u6062\u590d\u4e3a\u5916\u5c42\u503c\u3002<\/li>\n<\/ul>\n

              \u57fa\u672c\u5f62\u5f0f\u5982\u4e0b：<\/p>\n

              private<\/span> static<\/span> final<\/span> ScopedValue<\/span><<\/span>String<\/span>><\/span><\/span> TRACE_ID<\/span> =<\/span>
              \n ScopedValue<\/span>.<\/span>newInstance<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

              ScopedValue<\/span>.<\/span>where<\/span>(<\/span>TRACE_ID<\/span>,<\/span> "trace-001"<\/span>)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
              \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>TRACE_ID<\/span>.<\/span>get<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
              \n businessMethod<\/span>(<\/span>)<\/span>;<\/span>
              \n}<\/span>)<\/span>;<\/span><\/p>\n

              \u5728 run \u6267\u884c\u671f\u95f4：<\/p>\n

                \n
              • \u5f53\u524d lambda \u53ef\u4ee5\u8bfb\u53d6 TRACE_ID；<\/li>\n
              • businessMethod() \u53ef\u4ee5\u8bfb\u53d6；<\/li>\n
              • businessMethod() \u7ee7\u7eed\u8c03\u7528\u7684\u65b9\u6cd5\u4e5f\u53ef\u4ee5\u8bfb\u53d6；<\/li>\n
              • \u5f53\u524d\u7ebf\u7a0b\u4e2d\u8fd9\u6bb5\u64cd\u4f5c\u4e4b\u5916\u7684\u4ee3\u7801\u4e0d\u80fd\u8bfb\u53d6\u8fd9\u4efd\u7ed1\u5b9a；<\/li>\n
              • \u5176\u4ed6\u7ebf\u7a0b\u4e0d\u4f1a\u56e0\u6b64\u83b7\u5f97\u7ed1\u5b9a\u3002<\/li>\n<\/ul>\n

                run \u8fd4\u56de\u540e，\u7ed1\u5b9a\u81ea\u52a8\u89e3\u9664，\u4e0d\u9700\u8981 remove()\u3002<\/p>\n

                4.2 \u4ec0\u4e48\u662f\u52a8\u6001\u4f5c\u7528\u57df<\/h4>\n

                Java \u5c40\u90e8\u53d8\u91cf\u7684\u4f5c\u7528\u57df\u901a\u5e38\u662f\u8bcd\u6cd5\u4f5c\u7528\u57df：\u770b\u6e90\u4ee3\u7801\u4e2d\u7684 {}，\u57fa\u672c\u5c31\u80fd\u77e5\u9053\u53d8\u91cf\u5728\u54ea\u91cc\u53ef\u7528\u3002<\/p>\n

                Scoped Value \u4f7f\u7528\u7684\u662f\u52a8\u6001\u4f5c\u7528\u57df：\u4e0d\u53ea\u770b\u4ee3\u7801\u5199\u5728\u54ea\u91cc，\u8fd8\u770b\u4ee3\u7801\u5728\u54ea\u4e2a\u6267\u884c\u8fc7\u7a0b\u4e2d\u88ab\u8c03\u7528\u3002<\/p>\n

                private<\/span> static<\/span> final<\/span> ScopedValue<\/span><<\/span>String<\/span>><\/span><\/span> NAME<\/span> =<\/span>
                \n ScopedValue<\/span>.<\/span>newInstance<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                static<\/span> void<\/span> printName<\/span>(<\/span>)<\/span> {<\/span>
                \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>NAME<\/span>.<\/span>orElse<\/span>(<\/span>"\u672a\u7ed1\u5b9a"<\/span>)<\/span>)<\/span>;<\/span>
                \n}<\/span><\/p>\n

                static<\/span> void<\/span> demo<\/span>(<\/span>)<\/span> {<\/span>
                \n ScopedValue<\/span>.<\/span>where<\/span>(<\/span>NAME<\/span>,<\/span> "\u5916\u5c42\u8bf7\u6c42"<\/span>)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                \n printName<\/span>(<\/span>)<\/span>;<\/span>
                \n }<\/span>)<\/span>;<\/span><\/p>\n

                printName<\/span>(<\/span>)<\/span>;<\/span>
                \n}<\/span><\/p>\n

                \u8f93\u51fa\u4e3a：<\/p>\n

                \u5916\u5c42\u8bf7\u6c42
                \n\u672a\u7ed1\u5b9a<\/p>\n

                printName() \u7684\u6e90\u4ee3\u7801\u6ca1\u6709\u6539\u53d8，\u4e24\u6b21\u8c03\u7528\u8bfb\u53d6\u7ed3\u679c\u4e0d\u540c，\u56e0\u4e3a\u7b2c\u4e00\u6b21\u53d1\u751f\u5728\u7ed1\u5b9a\u64cd\u4f5c\u7684\u52a8\u6001\u4f5c\u7528\u57df\u5185，\u7b2c\u4e8c\u6b21\u4e0d\u5728\u3002<\/p>\n

                \u518d\u770b\u4e00\u4e2a\u56de\u8c03\u4f8b\u5b50：<\/p>\n

                Runnable<\/span> callback =<\/span> (<\/span>)<\/span> -><\/span> {<\/span>
                \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>NAME<\/span>.<\/span>isBound<\/span>(<\/span>)<\/span> ?<\/span> NAME<\/span>.<\/span>get<\/span>(<\/span>)<\/span> :<\/span> "\u672a\u7ed1\u5b9a"<\/span>)<\/span>;<\/span>
                \n}<\/span>;<\/span><\/p>\n

                ScopedValue<\/span>.<\/span>where<\/span>(<\/span>NAME<\/span>,<\/span> "hello"<\/span>)<\/span>.<\/span>run<\/span>(<\/span>callback)<\/span>;<\/span>
                \ncallback.<\/span>run<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                \u8f93\u51fa\u540c\u6837\u662f：<\/p>\n

                hello
                \n\u672a\u7ed1\u5b9a<\/p>\n

                \u6240\u4ee5，\u4e0d\u8981\u628a\u201clambda \u7684\u6e90\u4ee3\u7801\u4f4d\u7f6e\u201d\u8bef\u8ba4\u4e3a\u4f5c\u7528\u57df\u672c\u8eab\u3002\u771f\u6b63\u51b3\u5b9a\u7ed1\u5b9a\u662f\u5426\u5b58\u5728\u7684\u662f：\u5f53\u524d\u4ee3\u7801\u662f\u5426\u6b63\u8fd0\u884c\u5728 where(…).run\/call \u6240\u6267\u884c\u7684\u64cd\u4f5c\u5185\u90e8\u3002<\/p>\n

                \u4e94\u3001\u7b2c\u4e00\u4e2a\u5b8c\u6574\u793a\u4f8b：\u4f20\u9012\u8bf7\u6c42\u4e0a\u4e0b\u6587<\/h3>\n

                \u4e0b\u9762\u662f\u4e00\u4e2a\u53ea\u4f9d\u8d56 Java 25 \u6807\u51c6\u5e93\u7684\u5b8c\u6574\u793a\u4f8b，\u4e0d\u9700\u8981\u542f\u7528\u9884\u89c8\u7279\u6027：<\/p>\n

                public<\/span> class<\/span> ScopedValueDemo<\/span> {<\/span><\/p>\n

                record<\/span> RequestContext<\/span>(<\/span>String<\/span> traceId,<\/span> long<\/span> userId)<\/span> {<\/span>
                \n }<\/span><\/p>\n

                private<\/span> static<\/span> final<\/span> ScopedValue<\/span><<\/span>RequestContext<\/span>><\/span><\/span> CONTEXT<\/span> =<\/span>
                \n ScopedValue<\/span>.<\/span>newInstance<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                static<\/span> String<\/span> loadOrder<\/span>(<\/span>long<\/span> orderId)<\/span> {<\/span>
                \n RequestContext<\/span> context =<\/span> CONTEXT<\/span>.<\/span>get<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                return<\/span> "order="<\/span> +<\/span> orderId
                \n +<\/span> ", user="<\/span> +<\/span> context.<\/span>userId<\/span>(<\/span>)<\/span>
                \n +<\/span> ", trace="<\/span> +<\/span> context.<\/span>traceId<\/span>(<\/span>)<\/span>;<\/span>
                \n }<\/span><\/p>\n

                static<\/span> void<\/span> handleRequest<\/span>(<\/span>long<\/span> userId)<\/span> {<\/span>
                \n var<\/span> context =<\/span> new<\/span> RequestContext<\/span>(<\/span>"trace-20261102-001"<\/span>,<\/span> userId)<\/span>;<\/span><\/p>\n

                ScopedValue<\/span>.<\/span>where<\/span>(<\/span>CONTEXT<\/span>,<\/span> context)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>loadOrder<\/span>(<\/span>1001L<\/span>)<\/span>)<\/span>;<\/span>
                \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u4f5c\u7528\u57df\u5185\u662f\u5426\u7ed1\u5b9a："<\/span> +<\/span> CONTEXT<\/span>.<\/span>isBound<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                \n }<\/span>)<\/span>;<\/span><\/p>\n

                System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>"\u4f5c\u7528\u57df\u5916\u662f\u5426\u7ed1\u5b9a："<\/span> +<\/span> CONTEXT<\/span>.<\/span>isBound<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                \n }<\/span><\/p>\n

                public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> {<\/span>
                \n handleRequest<\/span>(<\/span>42L<\/span>)<\/span>;<\/span>
                \n }<\/span>
                \n}<\/span><\/p>\n

                \u8fd0\u884c\u7ed3\u679c：<\/p>\n

                order=1001, user=42, trace=trace-20261102-001
                \n\u4f5c\u7528\u57df\u5185\u662f\u5426\u7ed1\u5b9a：true
                \n\u4f5c\u7528\u57df\u5916\u662f\u5426\u7ed1\u5b9a：false<\/p>\n

                \u8fd9\u6bb5\u4ee3\u7801\u5c55\u793a\u4e86\u63a8\u8350\u7684\u6574\u4f53\u7ed3\u6784：<\/p>\n

              • \u7528\u4e00\u4e2a\u4e0d\u53ef\u53d8 record \u805a\u5408\u4e0a\u4e0b\u6587；<\/li>\n
              • \u7528\u4e00\u4e2a static final ScopedValue \u4f5c\u4e3a\u952e；<\/li>\n
              • \u5728\u8bf7\u6c42\u5165\u53e3\u7ed1\u5b9a；<\/li>\n
              • \u6df1\u5c42\u4e1a\u52a1\u65b9\u6cd5\u8bfb\u53d6；<\/li>\n
              • \u8bf7\u6c42\u5904\u7406\u7ed3\u675f\u540e\u81ea\u52a8\u89e3\u7ed1\u3002<\/li>\n

                \u6ce8\u610f，\u793a\u4f8b\u4e2d\u7684 CONTEXT \u662f private\u3002\u8fd9\u4e0d\u4ec5\u662f\u4e00\u79cd\u5c01\u88c5\u4e60\u60ef，\u4e5f\u4e0e\u8bbf\u95ee\u63a7\u5236\u6709\u5173\u3002<\/p>\n

                \u516d\u3001Java 25 \u6b63\u5f0f API \u8be6\u89e3<\/h3>\n

                6.1 newInstance：\u521b\u5efa\u521d\u59cb\u672a\u7ed1\u5b9a\u7684\u952e<\/h4>\n

                private<\/span> static<\/span> final<\/span> ScopedValue<\/span><<\/span>RequestContext<\/span>><\/span><\/span> CONTEXT<\/span> =<\/span>
                \n ScopedValue<\/span>.<\/span>newInstance<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                ScopedValue<T> \u672c\u8eab\u4e0d\u662f\u4e0a\u4e0b\u6587\u503c，\u800c\u662f\u4e00\u4e2a\u7c7b\u578b\u5b89\u5168\u7684\u952e\u3002<\/p>\n

                \u521a\u521b\u5efa\u65f6，\u5b83\u5728\u6240\u6709\u7ebf\u7a0b\u4e2d\u90fd\u5904\u4e8e\u672a\u7ed1\u5b9a\u72b6\u6001\u3002<\/p>\n

                \u901a\u5e38\u5e94\u5f53\u58f0\u660e\u4e3a static final：<\/p>\n

                  \n
                • static：\u8ba9\u540c\u4e00\u5957\u534f\u4f5c\u4ee3\u7801\u5171\u4eab\u540c\u4e00\u4e2a\u952e；<\/li>\n
                • final：\u907f\u514d\u952e\u5f15\u7528\u88ab\u66ff\u6362；<\/li>\n
                • \u5c3d\u91cf private：\u9650\u5236\u54ea\u4e9b\u4ee3\u7801\u53ef\u4ee5\u8bfb\u53d6\u6216\u7ed1\u5b9a\u5b83\u3002<\/li>\n<\/ul>\n

                  \u628a\u952e\u58f0\u660e\u4e3a public static final，\u76f8\u5f53\u4e8e\u628a\u8bfb\u53d6\u548c\u7ed1\u5b9a\u80fd\u529b\u66b4\u9732\u7ed9\u6240\u6709\u80fd\u8bbf\u95ee\u5b83\u7684\u4ee3\u7801\u3002<\/p>\n

                  6.2 where + run：\u6267\u884c\u65e0\u8fd4\u56de\u503c\u64cd\u4f5c<\/h4>\n

                  ScopedValue<\/span>.<\/span>where<\/span>(<\/span>CONTEXT<\/span>,<\/span> context)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                  \n processOrder<\/span>(<\/span>)<\/span>;<\/span>
                  \n}<\/span>)<\/span>;<\/span><\/p>\n

                  where \u4e0d\u4f1a\u7acb\u523b\u5728\u5f53\u524d\u4f4d\u7f6e\u5efa\u7acb\u957f\u671f\u7ed1\u5b9a\u3002\u5b83\u8fd4\u56de\u4e00\u4e2a ScopedValue.Carrier，\u968f\u540e\u7531 run \u5728\u64cd\u4f5c\u6267\u884c\u671f\u95f4\u5efa\u7acb\u7ed1\u5b9a\u3002<\/p>\n

                  run \u63a5\u6536 Runnable，\u9002\u5408\u65e0\u8fd4\u56de\u503c\u64cd\u4f5c：<\/p>\n

                  static<\/span> void<\/span> runWithContext<\/span>(<\/span>RequestContext<\/span> context)<\/span> {<\/span>
                  \n ScopedValue<\/span>.<\/span>where<\/span>(<\/span>CONTEXT<\/span>,<\/span> context)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                  \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>CONTEXT<\/span>.<\/span>get<\/span>(<\/span>)<\/span>.<\/span>traceId<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                  \n }<\/span>)<\/span>;<\/span>
                  \n}<\/span><\/p>\n

                  \u64cd\u4f5c\u6b63\u5e38\u7ed3\u675f\u6216\u629b\u51fa\u5f02\u5e38，\u7ed1\u5b9a\u90fd\u4f1a\u88ab\u6e05\u7406\u3002<\/p>\n

                  6.3 where + call：\u6267\u884c\u6709\u8fd4\u56de\u503c\u64cd\u4f5c<\/h4>\n

                  \u6709\u8fd4\u56de\u503c\u65f6\u4f7f\u7528 call：<\/p>\n

                  String<\/span> result =<\/span> ScopedValue<\/span>.<\/span>where<\/span>(<\/span>CONTEXT<\/span>,<\/span> context)<\/span>.<\/span>call<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                  \n return<\/span> loadOrder<\/span>(<\/span>1001L<\/span>)<\/span>;<\/span>
                  \n}<\/span>)<\/span>;<\/span><\/p>\n

                  \u53ef\u4ee5\u7701\u7565\u663e\u5f0f\u7684 return \u5199\u6cd5\u53d6\u51b3\u4e8e lambda \u4f53；\u4e0a\u9762\u7684\u591a\u884c\u5f62\u5f0f\u9700\u8981 return\u3002<\/p>\n

                  call \u4f7f\u7528 ScopedValue.CallableOp<T, X extends Throwable>，\u53ef\u4ee5\u4fdd\u7559\u53d7\u68c0\u5f02\u5e38：<\/p>\n

                  import<\/span> java.<\/span>io.<\/span><\/span>IOException<\/span><\/span>;<\/span>
                  \nimport<\/span> java.<\/span>nio.<\/span>file.<\/span><\/span>Files<\/span><\/span>;<\/span>
                  \nimport<\/span> java.<\/span>nio.<\/span>file.<\/span><\/span>Path<\/span><\/span>;<\/span><\/p>\n

                  private<\/span> static<\/span> final<\/span> ScopedValue<\/span><<\/span>Path<\/span>><\/span><\/span> INPUT_FILE<\/span> =<\/span>
                  \n ScopedValue<\/span>.<\/span>newInstance<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                  static<\/span> String<\/span> readMessage<\/span>(<\/span>)<\/span> throws<\/span> IOException<\/span> {<\/span>
                  \n return<\/span> ScopedValue<\/span>
                  \n .<\/span>where<\/span>(<\/span>INPUT_FILE<\/span>,<\/span> Path<\/span>.<\/span>of<\/span>(<\/span>"message.txt"<\/span>)<\/span>)<\/span>
                  \n .<\/span>call<\/span>(<\/span>(<\/span>)<\/span> -><\/span> Files<\/span>.<\/span>readString<\/span>(<\/span>INPUT_FILE<\/span>.<\/span>get<\/span>(<\/span>)<\/span>)<\/span>)<\/span>;<\/span>
                  \n}<\/span><\/p>\n

                  \u8fd9\u91cc\u4e0d\u9700\u8981\u628a IOException \u5f3a\u884c\u5305\u88c5\u6210 RuntimeException\u3002<\/p>\n

                  \u5982\u679c\u64cd\u4f5c\u6ca1\u6709\u8fd4\u56de\u503c\u4f46\u4f1a\u629b\u51fa\u53d7\u68c0\u5f02\u5e38，\u4e5f\u53ef\u4ee5\u8ba9 lambda \u8fd4\u56de null，\u4f7f\u7528 call；\u5982\u679c\u53ea\u6709\u8fd0\u884c\u65f6\u5f02\u5e38，\u76f4\u63a5\u4f7f\u7528 run \u5373\u53ef\u3002<\/p>\n

                  6.4 \u4e00\u6b21\u7ed1\u5b9a\u591a\u4e2a\u503c<\/h4>\n

                  \u53ef\u4ee5\u8fde\u7eed\u8c03\u7528 where：<\/p>\n

                  private<\/span> static<\/span> final<\/span> ScopedValue<\/span><<\/span>String<\/span>><\/span><\/span> TRACE_ID<\/span> =<\/span>
                  \n ScopedValue<\/span>.<\/span>newInstance<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                  private<\/span> static<\/span> final<\/span> ScopedValue<\/span><<\/span>Long<\/span>><\/span><\/span> USER_ID<\/span> =<\/span>
                  \n ScopedValue<\/span>.<\/span>newInstance<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                  ScopedValue<\/span>
                  \n .<\/span>where<\/span>(<\/span>TRACE_ID<\/span>,<\/span> "trace-001"<\/span>)<\/span>
                  \n .<\/span>where<\/span>(<\/span>USER_ID<\/span>,<\/span> 42L<\/span>)<\/span>
                  \n .<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                  \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>TRACE_ID<\/span>.<\/span>get<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                  \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>USER_ID<\/span>.<\/span>get<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                  \n }<\/span>)<\/span>;<\/span><\/p>\n

                  \u8fd9\u6bd4\u5d4c\u5957\u591a\u5c42 run \u66f4\u76f4\u89c2：<\/p>\n

                  \/\/ \u53ef\u8bfb\u6027\u8f83\u5dee，\u4e0d\u63a8\u8350\u7528\u6765\u7ec4\u7ec7\u4e00\u7ec4\u56fa\u5b9a\u4e0a\u4e0b\u6587<\/span>
                  \nScopedValue<\/span>.<\/span>where<\/span>(<\/span>TRACE_ID<\/span>,<\/span> "trace-001"<\/span>)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                  \n ScopedValue<\/span>.<\/span>where<\/span>(<\/span>USER_ID<\/span>,<\/span> 42L<\/span>)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                  \n \/\/ …<\/span>
                  \n }<\/span>)<\/span>;<\/span>
                  \n}<\/span>)<\/span>;<\/span><\/p>\n

                  \u4e0d\u8fc7，\u5728\u5b9e\u9645\u9879\u76ee\u4e2d，\u5982\u679c\u591a\u4e2a\u503c\u603b\u662f\u4e00\u8d77\u51fa\u73b0，\u901a\u5e38\u66f4\u63a8\u8350\u805a\u5408\u6210\u4e00\u4e2a\u4e0d\u53ef\u53d8\u5bf9\u8c61：<\/p>\n

                  public<\/span> record<\/span> RequestContext<\/span>(<\/span>
                  \n String<\/span> traceId,<\/span>
                  \n long<\/span> userId,<\/span>
                  \n long<\/span> tenantId)<\/span> {<\/span>
                  \n}<\/span><\/p>\n

                  private<\/span> static<\/span> final<\/span> ScopedValue<\/span><<\/span>RequestContext<\/span>><\/span><\/span> CONTEXT<\/span> =<\/span>
                  \n ScopedValue<\/span>.<\/span>newInstance<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                  \u8fd9\u6837\u53ef\u4ee5\u51cf\u5c11\u952e\u7684\u6570\u91cf，\u4e5f\u80fd\u907f\u514d\u53ea\u7ed1\u5b9a\u4e86\u4e00\u534a\u4e0a\u4e0b\u6587\u3002<\/p>\n

                  6.5 get：\u8bfb\u53d6\u5f53\u524d\u7ebf\u7a0b\u7684\u7ed1\u5b9a<\/h4>\n

                  RequestContext<\/span> context =<\/span> CONTEXT<\/span>.<\/span>get<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                  \u5982\u679c\u5f53\u524d\u7ebf\u7a0b\u6ca1\u6709\u7ed1\u5b9a，\u9ed8\u8ba4\u629b\u51fa：<\/p>\n

                  java.<\/span>util.<\/span><\/span>NoSuchElementException<\/span><\/p>\n

                  \u4e0b\u9762\u4ee3\u7801\u4f1a\u5728 run \u7ed3\u675f\u540e\u629b\u5f02\u5e38：<\/p>\n

                  ScopedValue<\/span>.<\/span>where<\/span>(<\/span>CONTEXT<\/span>,<\/span> context)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                  \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>CONTEXT<\/span>.<\/span>get<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                  \n}<\/span>)<\/span>;<\/span><\/p>\n

                  CONTEXT<\/span>.<\/span>get<\/span>(<\/span>)<\/span>;<\/span> \/\/ NoSuchElementException<\/span><\/p>\n

                  \u4e0d\u8981\u628a get() \u5f53\u6210 ThreadLocal.get()：\u540e\u8005\u5728\u672a\u8bbe\u7f6e\u65f6\u901a\u5e38\u8fd4\u56de null，\u524d\u8005\u5728\u672a\u7ed1\u5b9a\u65f6\u4f1a\u660e\u786e\u5931\u8d25\u3002<\/p>\n

                  6.6 isBound：\u5224\u65ad\u5f53\u524d\u7ebf\u7a0b\u662f\u5426\u7ed1\u5b9a<\/h4>\n

                  if<\/span> (<\/span>CONTEXT<\/span>.<\/span>isBound<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
                  \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>CONTEXT<\/span>.<\/span>get<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                  \n}<\/span><\/p>\n

                  \u9002\u5408\u4e0a\u4e0b\u6587\u786e\u5b9e\u53ef\u9009\u7684\u4ee3\u7801，\u4f8b\u5982：<\/p>\n

                  static<\/span> String<\/span> currentTraceId<\/span>(<\/span>)<\/span> {<\/span>
                  \n return<\/span> CONTEXT<\/span>.<\/span>isBound<\/span>(<\/span>)<\/span>
                  \n ?<\/span> CONTEXT<\/span>.<\/span>get<\/span>(<\/span>)<\/span>.<\/span>traceId<\/span>(<\/span>)<\/span>
                  \n :<\/span> "no-request"<\/span>;<\/span>
                  \n}<\/span><\/p>\n

                  \u4f46\u4e0d\u8981\u4e3a\u4e86\u51cf\u5c11\u5f02\u5e38\u800c\u5230\u5904\u4f7f\u7528 isBound + orElse\u3002<\/p>\n

                  \u5982\u679c\u8ba2\u5355\u670d\u52a1\u5fc5\u987b\u5728\u7528\u6237\u4e0a\u4e0b\u6587\u4e2d\u8fd0\u884c，\u7f3a\u5c11\u4e0a\u4e0b\u6587\u901a\u5e38\u8bf4\u660e\u5165\u53e3\u88c5\u914d\u9519\u8bef\u3002\u6b64\u65f6\u76f4\u63a5\u5931\u8d25，\u6bd4\u6084\u6084\u4f7f\u7528\u9ed8\u8ba4\u7528\u6237\u66f4\u5b89\u5168\u3002<\/p>\n

                  6.7 orElse：\u672a\u7ed1\u5b9a\u65f6\u63d0\u4f9b\u9ed8\u8ba4\u503c<\/h4>\n

                  String<\/span> traceId =<\/span> TRACE_ID<\/span>.<\/span>orElse<\/span>(<\/span>"no-trace"<\/span>)<\/span>;<\/span><\/p>\n

                  \u53ea\u6709\u201c\u672a\u7ed1\u5b9a\u201d\u65f6\u624d\u4f7f\u7528\u9ed8\u8ba4\u503c\u3002<\/p>\n

                  Java 25 \u7684\u4e00\u4e2a\u91cd\u8981\u53d8\u5316\u662f：orElse \u4e0d\u518d\u63a5\u53d7 null \u4f5c\u4e3a\u53c2\u6570\u3002\u56e0\u6b64\u4e0b\u9762\u5199\u6cd5\u4e0d\u9002\u7528\u4e8e\u6700\u7ec8\u7248\u672c：<\/p>\n

                  \/\/ Java 25 \u4e2d\u4e0d\u8981\u8fd9\u6837\u5199<\/span>
                  \nString<\/span> value =<\/span> TRACE_ID<\/span>.<\/span>orElse<\/span>(<\/span>null<\/span>)<\/span>;<\/span><\/p>\n

                  \u5982\u679c\u4e1a\u52a1\u786e\u5b9e\u5141\u8bb8 null，\u5e94\u5f53\u5148\u4f7f\u7528 isBound() \u5224\u65ad，\u6216\u8005\u91cd\u65b0\u8003\u8651\u662f\u5426\u771f\u7684\u9700\u8981\u7ed1\u5b9a\u4e00\u4e2a\u53ef\u7a7a\u503c\u3002<\/p>\n

                  6.8 orElseThrow：\u81ea\u5b9a\u4e49\u672a\u7ed1\u5b9a\u5f02\u5e38<\/h4>\n

                  RequestContext<\/span> context =<\/span> CONTEXT<\/span>.<\/span>orElseThrow<\/span>(<\/span>
                  \n (<\/span>)<\/span> -><\/span> new<\/span> IllegalStateException<\/span>(<\/span>"\u5f53\u524d\u7ebf\u7a0b\u672a\u7ed1\u5b9a\u8bf7\u6c42\u4e0a\u4e0b\u6587"<\/span>)<\/span>
                  \n)<\/span>;<\/span><\/p>\n

                  \u5b83\u6bd4\u9ed8\u8ba4\u7684 NoSuchElementException \u66f4\u5bb9\u6613\u8868\u8fbe\u4e1a\u52a1\u8bed\u4e49，\u4e5f\u4fbf\u4e8e\u7edf\u4e00\u5c01\u88c5\u3002<\/p>\n

                  6.9 \u7ed1\u5b9a null \u4e0e\u672a\u7ed1\u5b9a\u4e0d\u662f\u4e00\u56de\u4e8b<\/h4>\n

                  Java 25 \u7684 where(key, value) \u5141\u8bb8 value \u4e3a null：<\/p>\n

                  private<\/span> static<\/span> final<\/span> ScopedValue<\/span><<\/span>String<\/span>><\/span><\/span> OPTIONAL_VALUE<\/span> =<\/span>
                  \n ScopedValue<\/span>.<\/span>newInstance<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                  ScopedValue<\/span>.<\/span>where<\/span>(<\/span>OPTIONAL_VALUE<\/span>,<\/span> null<\/span>)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                  \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>OPTIONAL_VALUE<\/span>.<\/span>isBound<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ true<\/span>
                  \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>OPTIONAL_VALUE<\/span>.<\/span>get<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ null<\/span>
                  \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>OPTIONAL_VALUE<\/span>.<\/span>orElse<\/span>(<\/span>"\u9ed8\u8ba4"<\/span>)<\/span>)<\/span>;<\/span> \/\/ null<\/span>
                  \n}<\/span>)<\/span>;<\/span><\/p>\n

                  System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>OPTIONAL_VALUE<\/span>.<\/span>isBound<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ false<\/span>
                  \nSystem<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>OPTIONAL_VALUE<\/span>.<\/span>orElse<\/span>(<\/span>"\u9ed8\u8ba4"<\/span>)<\/span>)<\/span>;<\/span> \/\/ \u9ed8\u8ba4<\/span><\/p>\n

                  \u56e0\u6b64：<\/p>\n

                    \n
                  • isBound() \u5224\u65ad\u7684\u662f\u7ed1\u5b9a\u662f\u5426\u5b58\u5728；<\/li>\n
                  • get() \u8fd4\u56de\u7684\u662f\u7ed1\u5b9a\u503c，\u7ed1\u5b9a\u503c\u53ef\u4ee5\u4e3a null；<\/li>\n
                  • orElse() \u53ea\u5904\u7406\u672a\u7ed1\u5b9a，\u4e0d\u4f1a\u628a\u5df2\u7ed1\u5b9a\u7684 null \u66ff\u6362\u6210\u9ed8\u8ba4\u503c\u3002<\/li>\n<\/ul>\n

                    6.10 Carrier \u662f\u4ec0\u4e48<\/h4>\n

                    where \u8fd4\u56de\u7684 ScopedValue.Carrier \u662f\u4e00\u7ec4\u201c\u952e\u5230\u503c\u201d\u7684\u6620\u5c04：<\/p>\n

                    var<\/span> bindings =<\/span> ScopedValue<\/span>
                    \n .<\/span>where<\/span>(<\/span>TRACE_ID<\/span>,<\/span> "trace-001"<\/span>)<\/span>
                    \n .<\/span>where<\/span>(<\/span>USER_ID<\/span>,<\/span> 42L<\/span>)<\/span>;<\/span><\/p>\n

                    bindings.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                    \n \/\/ \u6267\u884c\u4efb\u52a1<\/span>
                    \n}<\/span>)<\/span>;<\/span><\/p>\n

                    Carrier \u672c\u8eab\u4e0d\u53ef\u53d8\u4e14\u7ebf\u7a0b\u5b89\u5168\u3002\u7ee7\u7eed\u8c03\u7528 where \u4f1a\u8fd4\u56de\u65b0\u7684 Carrier，\u800c\u4e0d\u662f\u4fee\u6539\u539f\u5bf9\u8c61：<\/p>\n

                    var<\/span> first =<\/span> ScopedValue<\/span>.<\/span>where<\/span>(<\/span>TRACE_ID<\/span>,<\/span> "trace-001"<\/span>)<\/span>;<\/span>
                    \nvar<\/span> second =<\/span> first.<\/span>where<\/span>(<\/span>USER_ID<\/span>,<\/span> 42L<\/span>)<\/span>;<\/span><\/p>\n

                    \/\/ first \u4ecd\u7136\u53ea\u5305\u542b TRACE_ID，second \u5305\u542b\u4e24\u4e2a\u6620\u5c04<\/span><\/p>\n

                    Carrier \u8fd8\u6709\u4e00\u4e2a\u5bb9\u6613\u8bef\u89e3\u7684 get(key)：<\/p>\n

                    String<\/span> value =<\/span> bindings.<\/span>get<\/span>(<\/span>TRACE_ID<\/span>)<\/span>;<\/span><\/p>\n

                    \u8fd9\u91cc\u8bfb\u53d6\u7684\u662f Carrier \u6620\u5c04\u4e2d\u4fdd\u5b58\u7684\u503c，\u4e0d\u662f\u201c\u5f53\u524d\u7ebf\u7a0b\u52a8\u6001\u4f5c\u7528\u57df\u4e2d\u7684\u503c\u201d\u3002\u5b83\u4e0e TRACE_ID.get() \u4e0d\u662f\u4e00\u56de\u4e8b\u3002<\/p>\n

                    \u65e5\u5e38\u8bf7\u6c42\u4e0a\u4e0b\u6587\u4ee3\u7801\u901a\u5e38\u76f4\u63a5\u4f7f\u7528 where(…).run\/call，\u4e0d\u9700\u8981\u663e\u5f0f\u64cd\u4f5c Carrier\u3002<\/p>\n

                    \u4e03\u3001\u81ea\u52a8\u6e05\u7406\u4e0e\u5d4c\u5957\u91cd\u7ed1\u5b9a<\/h3>\n

                    7.1 \u5f02\u5e38\u4e5f\u4f1a\u89e3\u9664\u7ed1\u5b9a<\/h4>\n

                    try<\/span> {<\/span>
                    \n ScopedValue<\/span>.<\/span>where<\/span>(<\/span>TRACE_ID<\/span>,<\/span> "trace-error"<\/span>)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                    \n throw<\/span> new<\/span> IllegalStateException<\/span>(<\/span>"\u6a21\u62df\u4e1a\u52a1\u5931\u8d25"<\/span>)<\/span>;<\/span>
                    \n }<\/span>)<\/span>;<\/span>
                    \n}<\/span> catch<\/span> (<\/span>IllegalStateException<\/span> e)<\/span> {<\/span>
                    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>e.<\/span>getMessage<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                    \n}<\/span><\/p>\n

                    System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>TRACE_ID<\/span>.<\/span>isBound<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ false<\/span><\/p>\n

                    \u65e0\u8bba\u64cd\u4f5c\u6b63\u5e38\u8fd4\u56de\u8fd8\u662f\u5f02\u5e38\u9000\u51fa，\u7ed1\u5b9a\u90fd\u4f1a\u89e3\u9664\u3002<\/p>\n

                    \u8fd9\u6d88\u9664\u4e86\u8bf7\u6c42\u5165\u53e3\u4e2d\u5355\u7eaf\u4e3a\u4e86 ThreadLocal.remove() \u800c\u5b58\u5728\u7684 try\/finally，\u4f46\u4e0d\u4f1a\u66ff\u4e1a\u52a1\u8d44\u6e90\u5b8c\u6210\u6e05\u7406\u3002\u6570\u636e\u5e93\u8fde\u63a5\u3001\u6587\u4ef6\u6d41\u3001\u9501\u7b49\u8d44\u6e90\u4ecd\u7136\u9700\u8981\u5404\u81ea\u6b63\u786e\u7684\u751f\u547d\u5468\u671f\u7ba1\u7406\u3002<\/p>\n

                    7.2 \u5d4c\u5957\u4f5c\u7528\u57df\u53ef\u4ee5\u91cd\u65b0\u7ed1\u5b9a<\/h4>\n

                    Scoped Value \u6ca1\u6709 set()，\u4f46\u5141\u8bb8\u5728\u5185\u90e8\u64cd\u4f5c\u4e2d\u4e3a\u540c\u4e00\u4e2a\u952e\u5efa\u7acb\u65b0\u7ed1\u5b9a：<\/p>\n

                    private<\/span> static<\/span> final<\/span> ScopedValue<\/span><<\/span>String<\/span>><\/span><\/span> TENANT<\/span> =<\/span>
                    \n ScopedValue<\/span>.<\/span>newInstance<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                    ScopedValue<\/span>.<\/span>where<\/span>(<\/span>TENANT<\/span>,<\/span> "tenant-a"<\/span>)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>TENANT<\/span>.<\/span>get<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ tenant-a<\/span><\/p>\n

                    ScopedValue<\/span>.<\/span>where<\/span>(<\/span>TENANT<\/span>,<\/span> "tenant-b"<\/span>)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                    \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>TENANT<\/span>.<\/span>get<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ tenant-b<\/span>
                    \n }<\/span>)<\/span>;<\/span><\/p>\n

                    System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>TENANT<\/span>.<\/span>get<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ tenant-a<\/span>
                    \n}<\/span>)<\/span>;<\/span><\/p>\n

                    System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>TENANT<\/span>.<\/span>isBound<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ false<\/span><\/p>\n

                    \u7ed1\u5b9a\u5173\u7cfb\u53ef\u4ee5\u753b\u6210：<\/p>\n

                    \u672a\u7ed1\u5b9a
                    \n \u2193 where(TENANT, tenant-a).run
                    \ntenant-a
                    \n \u2193 where(TENANT, tenant-b).run
                    \ntenant-b
                    \n \u2193 \u5185\u5c42\u64cd\u4f5c\u7ed3\u675f，\u6062\u590d
                    \ntenant-a
                    \n \u2193 \u5916\u5c42\u64cd\u4f5c\u7ed3\u675f，\u6062\u590d
                    \n\u672a\u7ed1\u5b9a<\/p>\n

                    \u8fd9\u79f0\u4e3a\u91cd\u7ed1\u5b9a（rebinding）\u3002<\/p>\n

                    \u5b83\u4e0d\u662f\u4fee\u6539\u539f\u6765\u7684\u7ed1\u5b9a，\u800c\u662f\u5728\u5d4c\u5957\u52a8\u6001\u4f5c\u7528\u57df\u4e2d\u5efa\u7acb\u4e00\u4e2a\u65b0\u7ed1\u5b9a\u3002\u5185\u5c42\u9000\u51fa\u540e，\u5916\u5c42\u503c\u81ea\u52a8\u6062\u590d，\u4e0d\u9700\u8981\u624b\u52a8\u4fdd\u5b58\u65e7\u503c\u3002<\/p>\n

                    7.3 \u4e3a\u4ec0\u4e48\u4ecd\u7136\u4e0d\u7b97\u968f\u610f set<\/h4>\n

                    \u4e0b\u9762\u8fd9\u79cd\u8bed\u4e49\u662f\u4e0d\u5b58\u5728\u7684：<\/p>\n

                    ScopedValue<\/span>.<\/span>where<\/span>(<\/span>TENANT<\/span>,<\/span> "tenant-a"<\/span>)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                    \n \/\/ \u5f53\u524d\u4f5c\u7528\u57df\u4e0d\u80fd\u628a TENANT.set("tenant-b")<\/span>
                    \n \/\/ \u4ece\u800c\u5f71\u54cd\u672c\u4f5c\u7528\u57df\u540e\u7eed\u6240\u6709\u8bfb\u53d6<\/span>
                    \n}<\/span>)<\/span>;<\/span><\/p>\n

                    \u80fd\u591f\u91cd\u7ed1\u5b9a\u7684\u4ee3\u7801\u5fc5\u987b\u62e5\u6709\u952e，\u5e76\u4e14\u8981\u660e\u786e\u5f00\u542f\u4e00\u4e2a\u65b0\u7684 run \u6216 call \u8fb9\u754c\u3002\u8fd9\u4e2a\u8fb9\u754c\u8ba9\u6570\u636e\u6d41\u91cd\u65b0\u53d8\u5f97\u53ef\u89c1\u3002<\/p>\n

                    \u516b\u3001\u201c\u4e0d\u53ef\u53d8\u201d\u5230\u5e95\u4fdd\u8bc1\u4e86\u4ec0\u4e48<\/h3>\n

                    8.1 \u4e0d\u53ef\u53d8\u7684\u662f\u7ed1\u5b9a\u5173\u7cfb，\u4e0d\u662f\u81ea\u52a8\u51bb\u7ed3\u5bf9\u8c61<\/h4>\n

                    Scoped Value \u6ca1\u6709 set()，\u4e0d\u4ee3\u8868\u4e0b\u9762\u7684\u5bf9\u8c61\u4e0d\u53ef\u53d8：<\/p>\n

                    public<\/span> class<\/span> MutableContext<\/span> {<\/span>
                    \n public<\/span> String<\/span> userId;<\/span>
                    \n}<\/span><\/p>\n

                    \u5982\u679c\u628a\u8fd9\u79cd\u5bf9\u8c61\u7ed1\u5b9a\u540e\u5171\u4eab\u7ed9\u591a\u4e2a\u5b50\u7ebf\u7a0b，\u5b50\u7ebf\u7a0b\u4ecd\u7136\u53ef\u4ee5\u540c\u65f6\u4fee\u6539\u5b83\u3002<\/p>\n

                    \u5b98\u65b9\u6587\u6863\u56e0\u6b64\u660e\u786e\u8981\u6c42：\u8de8\u7ebf\u7a0b\u5171\u4eab\u7684\u503c\u5e94\u5f53\u662f\u4e0d\u53ef\u53d8\u5bf9\u8c61，\u6216\u8005\u6240\u6709\u8bbf\u95ee\u90fd\u7ecf\u8fc7\u9002\u5f53\u540c\u6b65\u3002<\/p>\n

                    8.2 record \u4e5f\u4e0d\u4e00\u5b9a\u6df1\u5ea6\u4e0d\u53ef\u53d8<\/h4>\n

                    \u4e0b\u9762\u8bb0\u5f55\u770b\u8d77\u6765\u4e0d\u53ef\u53d8，\u4f46\u5217\u8868\u5185\u5bb9\u4ecd\u7136\u53ef\u4ee5\u88ab\u4fee\u6539：<\/p>\n

                    record<\/span> BadContext<\/span>(<\/span>List<\/span><<\/span>String<\/span>><\/span><\/span> permissions)<\/span> {<\/span>
                    \n}<\/span><\/p>\n

                    var<\/span> permissions =<\/span> new<\/span> java.<\/span>util.<\/span><\/span>ArrayList<\/span><<\/span>String<\/span>><\/span><\/span>(<\/span>)<\/span>;<\/span>
                    \npermissions.<\/span>add<\/span>(<\/span>"order:read"<\/span>)<\/span>;<\/span><\/p>\n

                    var<\/span> context =<\/span> new<\/span> BadContext<\/span>(<\/span>permissions)<\/span>;<\/span>
                    \npermissions.<\/span>add<\/span>(<\/span>"order:delete"<\/span>)<\/span>;<\/span> \/\/ record \u4e2d\u7684\u5217\u8868\u4e5f\u53d1\u751f\u4e86\u53d8\u5316<\/span><\/p>\n

                    \u66f4\u7a33\u59a5\u7684\u505a\u6cd5\u662f defensive copy：<\/p>\n

                    import<\/span> java.<\/span>util.<\/span><\/span>List<\/span><\/span>;<\/span><\/p>\n

                    public<\/span> record<\/span> RequestContext<\/span>(<\/span>
                    \n String<\/span> traceId,<\/span>
                    \n String<\/span> userId,<\/span>
                    \n List<\/span><<\/span>String<\/span>><\/span><\/span> permissions)<\/span> {<\/span><\/p>\n

                    public<\/span> RequestContext<\/span> {<\/span>
                    \n permissions =<\/span> List<\/span>.<\/span>copyOf<\/span>(<\/span>permissions)<\/span>;<\/span>
                    \n }<\/span>
                    \n}<\/span><\/p>\n

                    \u5982\u679c\u4e0a\u4e0b\u6587\u5305\u542b\u5176\u4ed6\u5bf9\u8c61，\u4e5f\u8981\u7ee7\u7eed\u68c0\u67e5\u8fd9\u4e9b\u5bf9\u8c61\u662f\u5426\u771f\u6b63\u4e0d\u53ef\u53d8\u3002<\/p>\n

                    8.3 \u4e0d\u8981\u628a\u8fde\u63a5\u3001\u9501\u548c\u4f1a\u8bdd\u72b6\u6001\u968f\u624b\u585e\u8fdb\u4e0a\u4e0b\u6587<\/h4>\n

                    Scoped Value \u9002\u5408\u4f20\u9012\u6570\u636e\u5feb\u7167，\u4e0d\u9002\u5408\u501f\u6b64\u7ed5\u8fc7\u8d44\u6e90\u751f\u547d\u5468\u671f：<\/p>\n

                      \n
                    • JDBC Connection \u6709\u4e8b\u52a1\u72b6\u6001\u3001\u7ebf\u7a0b\u7ea6\u675f\u548c\u5173\u95ed\u8981\u6c42；<\/li>\n
                    • \u9501\u5fc5\u987b\u660e\u786e\u83b7\u53d6\u548c\u91ca\u653e；<\/li>\n
                    • \u53ef\u5199\u4f1a\u8bdd\u4f1a\u5f15\u5165\u5e76\u53d1\u4fee\u6539；<\/li>\n
                    • \u5927\u578b\u7f13\u5b58\u5bf9\u8c61\u53ef\u80fd\u5ef6\u957f\u751f\u547d\u5468\u671f\u5e76\u589e\u52a0\u5185\u5b58\u5360\u7528\u3002<\/li>\n<\/ul>\n

                      \u201c\u7ed1\u5b9a\u4f1a\u81ea\u52a8\u89e3\u9664\u201d\u53ea\u610f\u5473\u7740\u952e\u4e0d\u518d\u80fd\u901a\u8fc7\u5f53\u524d\u4f5c\u7528\u57df\u8bfb\u53d6，\u4e0d\u7b49\u4e8e\u8fde\u63a5\u81ea\u52a8\u5173\u95ed，\u4e5f\u4e0d\u7b49\u4e8e\u5bf9\u8c61\u7acb\u5373\u88ab\u5783\u573e\u56de\u6536\u3002<\/p>\n

                      \u5982\u679c\u4e1a\u52a1\u4ee3\u7801\u628a CONTEXT.get() \u5f97\u5230\u7684\u5bf9\u8c61\u4fdd\u5b58\u5230\u9759\u6001\u96c6\u5408\u3001\u7f13\u5b58\u6216\u5f02\u6b65\u4efb\u52a1\u4e2d，\u8be5\u5bf9\u8c61\u4ecd\u7136\u4f1a\u7ee7\u7eed\u5b58\u6d3b\u3002<\/p>\n

                      \u4e5d\u3001\u8de8\u7ebf\u7a0b\u7ee7\u627f：\u5fc5\u987b\u4e0e StructuredTaskScope \u4e00\u8d77\u7406\u89e3<\/h3>\n

                      9.1 \u4e0d\u662f\u521b\u5efa\u4efb\u4f55\u5b50\u7ebf\u7a0b\u90fd\u4f1a\u7ee7\u627f<\/h4>\n

                      Java 25 \u7684 Scoped Value \u8de8\u7ebf\u7a0b\u5171\u4eab\u6709\u660e\u786e\u9650\u5236：<\/p>\n

                      \u5b50\u7ebf\u7a0b\u5fc5\u987b\u5728\u7236\u7ebf\u7a0b\u7684\u6709\u754c\u6267\u884c\u8fc7\u7a0b\u4e2d\u542f\u52a8，\u5e76\u4e14\u5728\u7236\u4f5c\u7528\u57df\u7ed3\u675f\u524d\u5b8c\u6210\u3002<\/p>\n

                      StructuredTaskScope \u6b63\u597d\u63d0\u4f9b\u4e86\u8fd9\u79cd\u7ed3\u6784\u3002<\/p>\n

                      \u4e0b\u9762\u4ee3\u7801\u53ef\u4ee5\u4f20\u9012\u4e0a\u4e0b\u6587：<\/p>\n

                      import<\/span> java.<\/span>util.<\/span>concurrent.<\/span><\/span>StructuredTaskScope<\/span><\/span>;<\/span>
                      \nimport<\/span> java.<\/span>util.<\/span>concurrent.<\/span><\/span>StructuredTaskScope<\/span>.<\/span>Subtask<\/span><\/span>;<\/span><\/p>\n

                      public<\/span> class<\/span> StructuredContextDemo<\/span> {<\/span><\/p>\n

                      private<\/span> static<\/span> final<\/span> ScopedValue<\/span><<\/span>String<\/span>><\/span><\/span> TRACE_ID<\/span> =<\/span>
                      \n ScopedValue<\/span>.<\/span>newInstance<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                      static<\/span> String<\/span> load<\/span>(<\/span>String<\/span> resource)<\/span> {<\/span>
                      \n return<\/span> resource +<\/span> " -> "<\/span> +<\/span> TRACE_ID<\/span>.<\/span>get<\/span>(<\/span>)<\/span>;<\/span>
                      \n }<\/span><\/p>\n

                      public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[<\/span>]<\/span> args)<\/span> throws<\/span> Exception<\/span> {<\/span>
                      \n String<\/span> result =<\/span> ScopedValue<\/span>.<\/span>where<\/span>(<\/span>TRACE_ID<\/span>,<\/span> "trace-001"<\/span>)<\/span>.<\/span>call<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                      \n try<\/span> (<\/span>var<\/span> scope =<\/span> StructuredTaskScope<\/span>.<\/span>open<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
                      \n Subtask<\/span><<\/span>String<\/span>><\/span><\/span> user =<\/span> scope.<\/span>fork<\/span>(<\/span>(<\/span>)<\/span> -><\/span> load<\/span>(<\/span>"\u7528\u6237\u4fe1\u606f"<\/span>)<\/span>)<\/span>;<\/span>
                      \n Subtask<\/span><<\/span>String<\/span>><\/span><\/span> order =<\/span> scope.<\/span>fork<\/span>(<\/span>(<\/span>)<\/span> -><\/span> load<\/span>(<\/span>"\u8ba2\u5355\u4fe1\u606f"<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

                      scope.<\/span>join<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                      return<\/span> user.<\/span>get<\/span>(<\/span>)<\/span> +<\/span> System<\/span>.<\/span>lineSeparator<\/span>(<\/span>)<\/span> +<\/span> order.<\/span>get<\/span>(<\/span>)<\/span>;<\/span>
                      \n }<\/span>
                      \n }<\/span>)<\/span>;<\/span><\/p>\n

                      System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>result)<\/span>;<\/span>
                      \n }<\/span>
                      \n}<\/span><\/p>\n

                      \u9884\u671f\u8f93\u51fa：<\/p>\n

                      \u7528\u6237\u4fe1\u606f -> trace-001
                      \n\u8ba2\u5355\u4fe1\u606f -> trace-001<\/p>\n

                      \u5728 Java 25 \u4e2d，\u7ed3\u6784\u5316\u5e76\u53d1\u4ecd\u662f\u9884\u89c8 API，\u9700\u8981\u4f7f\u7528\u4e0e\u8fd0\u884c\u7248\u672c\u4e00\u81f4\u7684 JDK 25 \u7f16\u8bd1\u5e76\u542f\u7528\u9884\u89c8：<\/p>\n

                      javac –release<\/span> 25<\/span> –enable-preview StructuredContextDemo.java
                      \njava<\/span> –enable-preview StructuredContextDemo<\/p>\n

                      \u5982\u679c\u53ea\u4f7f\u7528 ScopedValue，\u4e0d\u6d89\u53ca StructuredTaskScope，\u5219\u4e0d\u9700\u8981\u8fd9\u4e9b\u9884\u89c8\u53c2\u6570\u3002<\/p>\n

                      9.2 \u4e3a\u4ec0\u4e48\u5b50\u4efb\u52a1\u80fd\u5b89\u5168\u7ee7\u627f<\/h4>\n

                      \u7ed3\u6784\u5316\u4f5c\u7528\u57df\u4fdd\u8bc1\u4e86：<\/p>\n

                      \u7236\u4efb\u52a1\u7ed1\u5b9a\u4e0a\u4e0b\u6587
                      \n \u2193
                      \n\u6253\u5f00 StructuredTaskScope
                      \n \u2193
                      \nfork \u5b50\u4efb\u52a1，\u7ee7\u627f\u6253\u5f00 scope \u65f6\u6355\u83b7\u7684\u7ed1\u5b9a
                      \n \u2193
                      \njoin \/ close \u7b49\u5f85\u5b50\u4efb\u52a1\u7ed3\u675f
                      \n \u2193
                      \n\u7236\u4efb\u52a1\u9000\u51fa\u4e0a\u4e0b\u6587\u7ed1\u5b9a<\/p>\n

                      \u5b50\u4efb\u52a1\u4e0d\u4f1a\u5728\u5916\u5c42 run\/call \u5df2\u7ecf\u7ed3\u675f\u540e\u7ee7\u7eed\u5e26\u7740\u7ee7\u627f\u7ed1\u5b9a\u8fd0\u884c，\u56e0\u6b64\u751f\u547d\u5468\u671f\u4ecd\u7136\u662f\u660e\u786e\u7684\u3002<\/p>\n

                      close \u4f1a\u7b49\u5f85\u5b50\u4efb\u52a1\u7ebf\u7a0b\u7ed3\u675f；\u5982\u679c\u5b50\u4efb\u52a1\u4e0d\u54cd\u5e94\u4e2d\u65ad\u6216\u963b\u585e\u5728\u4e0d\u53ef\u4e2d\u65ad\u64cd\u4f5c\u4e0a，\u5173\u95ed\u4e5f\u53ef\u80fd\u88ab\u62d6\u5ef6\u3002\u4e0a\u4e0b\u6587\u6a21\u578b\u4e0d\u80fd\u66ff\u4ee3\u4efb\u52a1\u53d6\u6d88\u4e0e\u8d85\u65f6\u8bbe\u8ba1\u3002<\/p>\n

                      9.3 \u6355\u83b7\u53d1\u751f\u5728\u6253\u5f00 scope \u65f6<\/h4>\n

                      Java 25 \u6587\u6863\u660e\u786e\u8bf4\u660e：\u6253\u5f00 StructuredTaskScope \u65f6\u6355\u83b7\u5f53\u524d\u7ebf\u7a0b\u7684 Scoped Value \u7ed1\u5b9a；fork \u65f6\u8fd8\u4f1a\u68c0\u67e5\u5f53\u524d\u7ed1\u5b9a\u662f\u5426\u4e0e\u6253\u5f00 scope \u65f6\u5339\u914d\u3002<\/p>\n

                      \u6240\u4ee5\u6b63\u786e\u987a\u5e8f\u662f：<\/p>\n

                      ScopedValue<\/span>.<\/span>where<\/span>(<\/span>TRACE_ID<\/span>,<\/span> "trace-001"<\/span>)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                      \n try<\/span> (<\/span>var<\/span> scope =<\/span> StructuredTaskScope<\/span>.<\/span>open<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
                      \n scope.<\/span>fork<\/span>(<\/span>(<\/span>)<\/span> -><\/span> doWork<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                      \n scope.<\/span>join<\/span>(<\/span>)<\/span>;<\/span>
                      \n }<\/span>
                      \n}<\/span>)<\/span>;<\/span><\/p>\n

                      \u4e0d\u8981\u53cd\u8fc7\u6765：<\/p>\n

                      \/\/ \u9519\u8bef\u793a\u8303：scope \u6253\u5f00\u540e\u624d\u5efa\u7acb\u4e34\u65f6\u7ed1\u5b9a<\/span>
                      \ntry<\/span> (<\/span>var<\/span> scope =<\/span> StructuredTaskScope<\/span>.<\/span>open<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
                      \n ScopedValue<\/span>.<\/span>where<\/span>(<\/span>TRACE_ID<\/span>,<\/span> "trace-too-late"<\/span>)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                      \n scope.<\/span>fork<\/span>(<\/span>(<\/span>)<\/span> -><\/span> doWork<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                      \n scope.<\/span>join<\/span>(<\/span>)<\/span>;<\/span>
                      \n }<\/span>)<\/span>;<\/span>
                      \n}<\/span><\/p>\n

                      \u540e\u4e00\u79cd\u5199\u6cd5\u8ba9 fork \u65f6\u7684\u7ed1\u5b9a\u4e0e\u6253\u5f00 scope \u65f6\u4e0d\u4e00\u81f4，\u4e0d\u7b26\u5408\u7ed3\u6784\u5316\u7ee7\u627f\u7684\u7ea6\u675f\u3002<\/p>\n

                      9.4 \u5b50\u4efb\u52a1\u4e2d\u7684\u91cd\u7ed1\u5b9a\u53ea\u5f71\u54cd\u81ea\u5df1\u7684\u52a8\u6001\u4f5c\u7528\u57df<\/h4>\n

                      \u5b50\u4efb\u52a1\u7ee7\u627f\u540e\u4ecd\u7136\u53ef\u4ee5\u5d4c\u5957\u91cd\u7ed1\u5b9a：<\/p>\n

                      scope.<\/span>fork<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                      \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>TRACE_ID<\/span>.<\/span>get<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ \u7ee7\u627f\u503c<\/span><\/p>\n

                      ScopedValue<\/span>.<\/span>where<\/span>(<\/span>TRACE_ID<\/span>,<\/span> "child-trace"<\/span>)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                      \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>TRACE_ID<\/span>.<\/span>get<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ child-trace<\/span>
                      \n }<\/span>)<\/span>;<\/span><\/p>\n

                      System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>TRACE_ID<\/span>.<\/span>get<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ \u6062\u590d\u7ee7\u627f\u503c<\/span>
                      \n}<\/span>)<\/span>;<\/span><\/p>\n

                      \u8fd9\u4e0d\u4f1a\u4fee\u6539\u7236\u7ebf\u7a0b\u6216\u5144\u5f1f\u5b50\u4efb\u52a1\u770b\u5230\u7684\u7ed1\u5b9a\u3002<\/p>\n

                      \u5982\u679c\u7ee7\u627f\u503c\u672c\u8eab\u662f\u53ef\u53d8\u5bf9\u8c61，\u60c5\u51b5\u5219\u4e0d\u540c：\u7ed1\u5b9a\u662f\u9694\u79bb\u7684，\u5bf9\u8c61\u4ecd\u53ef\u80fd\u88ab\u5171\u4eab\u3002\u56e0\u6b64\u518d\u6b21\u5f3a\u8c03，\u8de8\u7ebf\u7a0b\u4e0a\u4e0b\u6587\u5e94\u4f18\u5148\u4f7f\u7528\u6df1\u5ea6\u4e0d\u53ef\u53d8\u6570\u636e\u3002<\/p>\n

                      9.5 \u666e\u901a\u865a\u62df\u7ebf\u7a0b\u4e0d\u4f1a\u81ea\u52a8\u7ee7\u627f Scoped Value<\/h4>\n

                      \u4e0b\u9762\u4ee3\u7801\u4e0d\u80fd\u9760\u201c\u865a\u62df\u7ebf\u7a0b\u5f88\u8f7b\u91cf\u201d\u63a8\u5bfc\u51fa\u4e0a\u4e0b\u6587\u7ee7\u627f：<\/p>\n

                      ScopedValue<\/span>.<\/span>where<\/span>(<\/span>TRACE_ID<\/span>,<\/span> "trace-001"<\/span>)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                      \n Thread<\/span>.<\/span>startVirtualThread<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                      \n \/\/ \u666e\u901a Thread.startVirtualThread \u4e0d\u63d0\u4f9b ScopedValue \u7ee7\u627f<\/span>
                      \n System<\/span>.<\/span>out.<\/span>println<\/span>(<\/span>TRACE_ID<\/span>.<\/span>isBound<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                      \n }<\/span>)<\/span>;<\/span>
                      \n}<\/span>)<\/span>;<\/span><\/p>\n

                      \u540c\u6837，\u4ee5\u4e0b\u673a\u5236\u4e5f\u4e0d\u4f1a\u81ea\u52a8\u590d\u5236\u63d0\u4ea4\u7ebf\u7a0b\u7684 Scoped Value：<\/p>\n

                        \n
                      • ExecutorService.submit()；<\/li>\n
                      • CompletableFuture.supplyAsync()；<\/li>\n
                      • \u5e76\u884c\u6d41；<\/li>\n
                      • \u666e\u901a ForkJoinPool；<\/li>\n
                      • \u4efb\u610f\u56de\u8c03\u5f0f\u5f02\u6b65 API\u3002<\/li>\n<\/ul>\n

                        \u5b83\u4eec\u4e0d\u662f StructuredTaskScope，\u4e5f\u6ca1\u6709\u540c\u6837\u7684\u7236\u5b50\u751f\u547d\u5468\u671f\u4fdd\u8bc1\u3002<\/p>\n

                        9.6 \u65e7\u7ebf\u7a0b\u6c60\u5fc5\u987b\u663e\u5f0f\u6355\u83b7\u3001\u663e\u5f0f\u91cd\u7ed1\u5b9a<\/h4>\n

                        \u5982\u679c\u65e7\u4ee3\u7801\u6682\u65f6\u4e0d\u80fd\u8fc1\u79fb\u5230\u7ed3\u6784\u5316\u5e76\u53d1，\u53ef\u4ee5\u5728\u63d0\u4ea4\u4efb\u52a1\u7684\u7ebf\u7a0b\u6355\u83b7\u4e0a\u4e0b\u6587，\u518d\u5728\u5de5\u4f5c\u7ebf\u7a0b\u4e2d\u5efa\u7acb\u65b0\u7ed1\u5b9a：<\/p>\n

                        RequestContext<\/span> snapshot =<\/span> CONTEXT<\/span>.<\/span>get<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                        executor.<\/span>submit<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                        \n ScopedValue<\/span>.<\/span>where<\/span>(<\/span>CONTEXT<\/span>,<\/span> snapshot)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                        \n doWork<\/span>(<\/span>)<\/span>;<\/span>
                        \n }<\/span>)<\/span>;<\/span>
                        \n}<\/span>)<\/span>;<\/span><\/p>\n

                        \u5173\u952e\u70b9\u662f：<\/p>\n

                      • CONTEXT.get() \u5728\u63d0\u4ea4\u7ebf\u7a0b\u6267\u884c，\u800c\u4e0d\u662f\u7b49\u5230\u5de5\u4f5c\u7ebf\u7a0b\u624d\u6267\u884c；<\/li>\n
                      • \u5de5\u4f5c\u7ebf\u7a0b\u901a\u8fc7\u65b0\u7684 run \u7ed1\u5b9a\u4e0a\u4e0b\u6587；<\/li>\n
                      • \u4efb\u52a1\u7ed3\u675f\u540e，\u5de5\u4f5c\u7ebf\u7a0b\u4e0a\u7684\u7ed1\u5b9a\u81ea\u52a8\u89e3\u9664；<\/li>\n
                      • snapshot \u5e94\u5f53\u662f\u4e0d\u53ef\u53d8\u5bf9\u8c61\u3002<\/li>\n

                        \u8fd9\u4e0d\u662f\u81ea\u52a8\u7ee7\u627f，\u800c\u662f\u4e00\u4e2a\u660e\u786e\u7684\u9002\u914d\u5668\u3002<\/p>\n

                        \u5982\u679c\u4efb\u52a1\u4f1a\u957f\u65f6\u95f4\u6392\u961f，\u5feb\u7167\u53ca\u4efb\u52a1\u5f15\u7528\u4f1a\u4e00\u76f4\u88ab\u4fdd\u7559；\u5982\u679c\u4e1a\u52a1\u8981\u6c42\u4e0a\u4e0b\u6587\u968f\u8bf7\u6c42\u53d6\u6d88，\u4e5f\u8fd8\u9700\u8981\u989d\u5916\u7684\u53d6\u6d88\u673a\u5236\u3002<\/p>\n

                        \u5341\u3001Scoped Value \u4e0e\u865a\u62df\u7ebf\u7a0b\u662f\u4ec0\u4e48\u5173\u7cfb<\/h3>\n

                        \u4e24\u8005\u7ecf\u5e38\u4e00\u8d77\u51fa\u73b0，\u4f46\u89e3\u51b3\u7684\u95ee\u9898\u4e0d\u540c：<\/p>\n\n\u6280\u672f\u4e3b\u8981\u89e3\u51b3\u7684\u95ee\u9898<\/tr>\n\n\n\n\n
                        \u865a\u62df\u7ebf\u7a0b<\/td>\n\u5927\u91cf\u5e76\u53d1\u963b\u585e\u4efb\u52a1\u4e0d\u5fc5\u5360\u7528\u540c\u6837\u6570\u91cf\u7684\u64cd\u4f5c\u7cfb\u7edf\u7ebf\u7a0b<\/td>\n<\/tr>\n
                        Scoped Value<\/td>\n\u53ea\u8bfb\u4e0a\u4e0b\u6587\u5982\u4f55\u5728\u6709\u754c\u8c03\u7528\u53ca\u7ed3\u6784\u5316\u5b50\u4efb\u52a1\u4e2d\u5b89\u5168\u5171\u4eab<\/td>\n<\/tr>\n
                        Structured Concurrency<\/td>\n\u5982\u4f55\u7ea6\u675f\u5b50\u4efb\u52a1\u751f\u547d\u5468\u671f\u3001\u5931\u8d25\u4f20\u64ad\u3001\u53d6\u6d88\u548c\u6c47\u5408<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                        \u53ef\u4ee5\u628a\u5b83\u4eec\u7ec4\u5408\u6210：<\/p>\n

                        \u4e00\u4e2a\u8bf7\u6c42\u4e00\u4e2a\u865a\u62df\u7ebf\u7a0b
                        \n \u2193
                        \n\u8bf7\u6c42\u5165\u53e3\u7ed1\u5b9a Scoped Value
                        \n \u2193
                        \n\u8bf7\u6c42\u5185\u90e8\u4f7f\u7528 StructuredTaskScope \u62c6\u5206 I\/O \u5b50\u4efb\u52a1
                        \n \u2193
                        \n\u5b50\u4efb\u52a1\u7ee7\u627f\u53ea\u8bfb\u4e0a\u4e0b\u6587
                        \n \u2193
                        \n\u6240\u6709\u5b50\u4efb\u52a1\u5b8c\u6210\u540e，\u8bf7\u6c42\u4e0a\u4e0b\u6587\u89e3\u9664<\/p>\n

                        \u4f46\u4e0d\u8981\u5f97\u51fa\u4e24\u4e2a\u6781\u7aef\u7ed3\u8bba：<\/p>\n

                          \n
                        • \u201c\u7528\u4e86\u865a\u62df\u7ebf\u7a0b，\u5c31\u5fc5\u987b\u5168\u90e8\u66ff\u6362 ThreadLocal\u201d\u2014\u2014\u9519\u8bef；<\/li>\n
                        • \u201c\u7528\u4e86 Scoped Value，\u5c31\u80fd\u89e3\u51b3\u6240\u6709\u5f02\u6b65\u4e0a\u4e0b\u6587\u4f20\u64ad\u201d\u2014\u2014\u540c\u6837\u9519\u8bef\u3002<\/li>\n<\/ul>\n

                          \u865a\u62df\u7ebf\u7a0b\u8ba9\u7ebf\u7a0b\u6570\u91cf\u53ef\u4ee5\u975e\u5e38\u5927，\u56e0\u6b64\u6bcf\u7ebf\u7a0b\u6570\u636e\u7684\u5185\u5b58\u6210\u672c\u548c\u751f\u547d\u5468\u671f\u66f4\u503c\u5f97\u91cd\u89c6；Scoped Value \u5219\u63d0\u4f9b\u4e86\u66f4\u9002\u5408\u53ea\u8bfb\u4e0a\u4e0b\u6587\u7684\u4e00\u79cd\u6570\u636e\u6d41\u6a21\u578b\u3002<\/p>\n

                          \u5341\u4e00\u3001Spring Boot \/ Spring MVC \u63a5\u5165\u793a\u4f8b<\/h3>\n

                          \u672c\u8282\u4ee5\u4f20\u7edf Spring MVC \u540c\u6b65\u8bf7\u6c42\u6a21\u578b\u4e3a\u4f8b，\u4e0d\u8ba8\u8bba WebFlux \u7684\u54cd\u5e94\u5f0f\u4e0a\u4e0b\u6587\u3002<\/p>\n

                          11.1 \u5b9a\u4e49\u4e0d\u53ef\u53d8\u4e0a\u4e0b\u6587<\/h4>\n

                          import<\/span> java.<\/span>util.<\/span><\/span>Objects<\/span><\/span>;<\/span><\/p>\n

                          public<\/span> record<\/span> RequestContext<\/span>(<\/span>String<\/span> traceId,<\/span> String<\/span> userId)<\/span> {<\/span><\/p>\n

                          public<\/span> RequestContext<\/span> {<\/span>
                          \n Objects<\/span>.<\/span>requireNonNull<\/span>(<\/span>traceId,<\/span> "traceId \u4e0d\u80fd\u4e3a\u7a7a"<\/span>)<\/span>;<\/span>
                          \n Objects<\/span>.<\/span>requireNonNull<\/span>(<\/span>userId,<\/span> "userId \u4e0d\u80fd\u4e3a\u7a7a"<\/span>)<\/span>;<\/span>
                          \n }<\/span>
                          \n}<\/span><\/p>\n

                          \u8fd9\u91cc\u7684 userId \u5e94\u6765\u81ea\u53ef\u4fe1\u8ba4\u8bc1\u7ed3\u679c，\u4e0d\u80fd\u76f4\u63a5\u4fe1\u4efb\u5ba2\u6237\u7aef\u968f\u610f\u4f20\u5165\u7684\u7528\u6237 Header\u3002<\/p>\n

                          11.2 \u5c01\u88c5\u952e，\u907f\u514d\u628a\u7ed1\u5b9a\u80fd\u529b\u66b4\u9732\u7ed9\u4e1a\u52a1\u4ee3\u7801<\/h4>\n

                          public<\/span> final<\/span> class<\/span> RequestContexts<\/span> {<\/span><\/p>\n

                          private<\/span> static<\/span> final<\/span> ScopedValue<\/span><<\/span>RequestContext<\/span>><\/span><\/span> CONTEXT<\/span> =<\/span>
                          \n ScopedValue<\/span>.<\/span>newInstance<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                          private<\/span> RequestContexts<\/span>(<\/span>)<\/span> {<\/span>
                          \n }<\/span><\/p>\n

                          public<\/span> static<\/span> RequestContext<\/span> current<\/span>(<\/span>)<\/span> {<\/span>
                          \n return<\/span> CONTEXT<\/span>.<\/span>orElseThrow<\/span>(<\/span>
                          \n (<\/span>)<\/span> -><\/span> new<\/span> IllegalStateException<\/span>(<\/span>"\u5f53\u524d\u7ebf\u7a0b\u672a\u7ed1\u5b9a\u8bf7\u6c42\u4e0a\u4e0b\u6587"<\/span>)<\/span>
                          \n )<\/span>;<\/span>
                          \n }<\/span><\/p>\n

                          public<\/span> static<\/span> boolean<\/span> isBound<\/span>(<\/span>)<\/span> {<\/span>
                          \n return<\/span> CONTEXT<\/span>.<\/span>isBound<\/span>(<\/span>)<\/span>;<\/span>
                          \n }<\/span><\/p>\n

                          public<\/span> static<\/span> void<\/span> run<\/span>(<\/span>RequestContext<\/span> context,<\/span> Runnable<\/span> action)<\/span> {<\/span>
                          \n ScopedValue<\/span>.<\/span>where<\/span>(<\/span>CONTEXT<\/span>,<\/span> context)<\/span>.<\/span>run<\/span>(<\/span>action)<\/span>;<\/span>
                          \n }<\/span><\/p>\n

                          public<\/span> static<\/span> <<\/span>R<\/span>,<\/span> X<\/span> extends<\/span> Throwable<\/span>><\/span><\/span> R<\/span> call<\/span>(<\/span>
                          \n RequestContext<\/span> context,<\/span>
                          \n ScopedValue.<\/span>CallableOp<\/span><<\/span>?<\/span> extends<\/span> R<\/span>,<\/span> X<\/span>><\/span><\/span> action)<\/span> throws<\/span> X<\/span> {<\/span>
                          \n return<\/span> ScopedValue<\/span>.<\/span>where<\/span>(<\/span>CONTEXT<\/span>,<\/span> context)<\/span>.<\/span>call<\/span>(<\/span>action)<\/span>;<\/span>
                          \n }<\/span>
                          \n}<\/span><\/p>\n

                          \u4e1a\u52a1\u5c42\u53ea\u80fd\u770b\u5230 current() \u7b49\u516c\u5f00\u65b9\u6cd5，\u65e0\u6cd5\u53d6\u5f97\u79c1\u6709\u952e\u5e76\u4efb\u610f\u91cd\u7ed1\u5b9a\u3002<\/p>\n

                          11.3 \u5728 Servlet Filter \u4e2d\u5305\u56f4\u6574\u4e2a\u540e\u7eed\u8c03\u7528\u94fe<\/h4>\n

                          import<\/span> jakarta.<\/span>servlet.<\/span><\/span>FilterChain<\/span><\/span>;<\/span>
                          \nimport<\/span> jakarta.<\/span>servlet.<\/span><\/span>ServletException<\/span><\/span>;<\/span>
                          \nimport<\/span> jakarta.<\/span>servlet.<\/span>http.<\/span><\/span>HttpServletRequest<\/span><\/span>;<\/span>
                          \nimport<\/span> jakarta.<\/span>servlet.<\/span>http.<\/span><\/span>HttpServletResponse<\/span><\/span>;<\/span>
                          \nimport<\/span> org.<\/span>springframework.<\/span>web.<\/span>filter.<\/span><\/span>OncePerRequestFilter<\/span><\/span>;<\/span><\/p>\n

                          import<\/span> java.<\/span>io.<\/span><\/span>IOException<\/span><\/span>;<\/span>
                          \nimport<\/span> java.<\/span>util.<\/span><\/span>Optional<\/span><\/span>;<\/span>
                          \nimport<\/span> java.<\/span>util.<\/span><\/span>UUID<\/span><\/span>;<\/span><\/p>\n

                          public<\/span> class<\/span> RequestContextFilter<\/span> extends<\/span> OncePerRequestFilter<\/span> {<\/span><\/p>\n

                          @Override<\/span>
                          \n protected<\/span> void<\/span> doFilterInternal<\/span>(<\/span>
                          \n HttpServletRequest<\/span> request,<\/span>
                          \n HttpServletResponse<\/span> response,<\/span>
                          \n FilterChain<\/span> filterChain)<\/span> throws<\/span> ServletException<\/span>,<\/span> IOException<\/span> {<\/span><\/p>\n

                          String<\/span> userId =<\/span> Optional<\/span>.<\/span>ofNullable<\/span>(<\/span>request.<\/span>getRemoteUser<\/span>(<\/span>)<\/span>)<\/span>
                          \n .<\/span>orElse<\/span>(<\/span>"anonymous"<\/span>)<\/span>;<\/span><\/p>\n

                          var<\/span> context =<\/span> new<\/span> RequestContext<\/span>(<\/span>
                          \n UUID<\/span>.<\/span>randomUUID<\/span>(<\/span>)<\/span>.<\/span>toString<\/span>(<\/span>)<\/span>,<\/span>
                          \n userId
                          \n )<\/span>;<\/span><\/p>\n

                          try<\/span> {<\/span>
                          \n RequestContexts<\/span>.<\/span>call<\/span>(<\/span>context,<\/span> (<\/span>)<\/span> -><\/span> {<\/span>
                          \n filterChain.<\/span>doFilter<\/span>(<\/span>request,<\/span> response)<\/span>;<\/span>
                          \n return<\/span> null<\/span>;<\/span>
                          \n }<\/span>)<\/span>;<\/span>
                          \n }<\/span> catch<\/span> (<\/span>IOException<\/span> |<\/span> ServletException<\/span> |<\/span> RuntimeException<\/span> |<\/span> Error<\/span> e)<\/span> {<\/span>
                          \n throw<\/span> e;<\/span>
                          \n }<\/span> catch<\/span> (<\/span>Exception<\/span> e)<\/span> {<\/span>
                          \n throw<\/span> new<\/span> ServletException<\/span>(<\/span>"\u6267\u884c\u8bf7\u6c42\u5904\u7406\u94fe\u5931\u8d25"<\/span>,<\/span> e)<\/span>;<\/span>
                          \n }<\/span>
                          \n }<\/span>
                          \n}<\/span><\/p>\n

                          \u8fd9\u6bb5\u8fb9\u754c\u4ee3\u7801\u6bd4\u4e1a\u52a1\u4ee3\u7801\u7a0d\u957f，\u539f\u56e0\u662f FilterChain.doFilter \u58f0\u660e\u4e86\u53d7\u68c0\u5f02\u5e38，\u800c Filter \u65b9\u6cd5\u53ea\u80fd\u6309 Servlet \u5951\u7ea6\u629b\u51fa\u6307\u5b9a\u5f02\u5e38\u3002\u8fd9\u91cc\u4fdd\u7559\u539f\u6709\u5f02\u5e38\u7c7b\u578b，\u5176\u4ed6\u53d7\u68c0\u5f02\u5e38\u518d\u5305\u88c5\u4e3a ServletException\u3002<\/p>\n

                          \u5b9e\u9645\u9879\u76ee\u8fd8\u5e94\u660e\u786e：<\/p>\n

                            \n
                          • Filter \u6ce8\u518c\u987a\u5e8f；<\/li>\n
                          • \u8ba4\u8bc1\u4fe1\u606f\u5728\u54ea\u4e00\u5c42\u4ea7\u751f；<\/li>\n
                          • \u662f\u5426\u63a5\u53d7\u5916\u90e8\u4f20\u5165\u7684 trace ID；<\/li>\n
                          • \u5916\u90e8 trace ID \u7684\u957f\u5ea6\u3001\u5b57\u7b26\u96c6\u4e0e\u65e5\u5fd7\u6ce8\u5165\u6821\u9a8c；<\/li>\n
                          • \u5f02\u6b65\u8bf7\u6c42\u5982\u4f55\u5904\u7406\u3002<\/li>\n<\/ul>\n

                            \u793a\u4f8b\u4e2d\u7684 anonymous \u53ea\u662f\u5c55\u793a\u4e0a\u4e0b\u6587\u4f20\u9012，\u4e0d\u80fd\u4f5c\u4e3a\u6388\u6743\u5224\u65ad\u4f9d\u636e\u3002\u8fd9\u4e2a Filter \u4e5f\u4e0d\u4f1a\u81ea\u52a8\u66ff\u4ee3 Spring Security \u7684 SecurityContextHolder\u3002<\/p>\n

                            11.4 \u6df1\u5c42\u4e1a\u52a1\u4ee3\u7801\u8bfb\u53d6\u4e0a\u4e0b\u6587<\/h4>\n

                            public<\/span> String<\/span> loadOrder<\/span>(<\/span>long<\/span> orderId)<\/span> {<\/span>
                            \n RequestContext<\/span> context =<\/span> RequestContexts<\/span>.<\/span>current<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                            \/\/ \u8fd9\u91cc\u53ea\u6f14\u793a\u8bfb\u53d6；\u771f\u5b9e\u9879\u76ee\u518d\u8c03\u7528\u8ba2\u5355\u4ed3\u50a8\u548c\u65e5\u5fd7\u7ec4\u4ef6<\/span>
                            \n return<\/span> "orderId="<\/span> +<\/span> orderId
                            \n +<\/span> ", traceId="<\/span> +<\/span> context.<\/span>traceId<\/span>(<\/span>)<\/span>
                            \n +<\/span> ", userId="<\/span> +<\/span> context.<\/span>userId<\/span>(<\/span>)<\/span>;<\/span>
                            \n}<\/span><\/p>\n

                            Controller \u4e0d\u9700\u8981\u628a traceId \u9010\u5c42\u4f20\u4e0b\u6765：<\/p>\n

                            public<\/span> String<\/span> getOrder<\/span>(<\/span>long<\/span> orderId)<\/span> {<\/span>
                            \n return<\/span> loadOrder<\/span>(<\/span>orderId)<\/span>;<\/span>
                            \n}<\/span><\/p>\n

                            11.5 \u5f02\u6b65\u8fb9\u754c\u4e0d\u80fd\u9760\u8fd9\u4e2a Filter \u81ea\u52a8\u89e3\u51b3<\/h4>\n

                            \u4e0b\u9762\u573a\u666f\u9700\u8981\u5355\u72ec\u9a8c\u8bc1\u4e0a\u4e0b\u6587\u4f20\u64ad：<\/p>\n

                              \n
                            • Spring @Async；<\/li>\n
                            • MVC Callable\u3001DeferredResult；<\/li>\n
                            • Servlet \u5f02\u6b65 dispatch；<\/li>\n
                            • \u81ea\u5b9a\u4e49\u7ebf\u7a0b\u6c60；<\/li>\n
                            • \u6d88\u606f\u961f\u5217\u6d88\u8d39\u8005；<\/li>\n
                            • \u5b9a\u65f6\u4efb\u52a1；<\/li>\n
                            • WebFlux \/ Reactor\u3002<\/li>\n<\/ul>\n

                              \u4f8b\u5982：<\/p>\n

                              @Async<\/span>
                              \npublic<\/span> void<\/span> asyncTask<\/span>(<\/span>)<\/span> {<\/span>
                              \n \/\/ \u4e0d\u80fd\u4ec5\u56e0\u4e3a Web \u5165\u53e3\u7ed1\u5b9a\u8fc7，\u5c31\u5047\u8bbe\u8fd9\u91cc\u4ecd\u6709 RequestContext<\/span>
                              \n}<\/span><\/p>\n

                              \u5bf9\u4e8e\u53d7\u7ba1\u5f02\u6b65\u7ec4\u4ef6，\u5e94\u4f18\u5148\u4f7f\u7528\u6846\u67b6\u63d0\u4f9b\u7684\u4efb\u52a1\u88c5\u9970\u5668\u6216\u4e0a\u4e0b\u6587\u4f20\u64ad\u673a\u5236；\u5bf9\u4e8e\u81ea\u5b9a\u4e49\u7ebf\u7a0b\u6c60，\u53ef\u4ee5\u4f7f\u7528\u524d\u6587\u201c\u63d0\u4ea4\u65f6\u6355\u83b7\u3001\u6267\u884c\u65f6\u91cd\u7ed1\u5b9a\u201d\u7684\u9002\u914d\u65b9\u5f0f\u3002<\/p>\n

                              \u5728 Reactor \u4e2d，\u8bf7\u6c42\u5904\u7406\u53ef\u80fd\u8de8\u591a\u4e2a\u7ebf\u7a0b，\u65b9\u6cd5\u8fd4\u56de\u65f6\u5f02\u6b65\u6d41\u751a\u81f3\u53ef\u80fd\u5c1a\u672a\u5f00\u59cb\u6267\u884c\u3002\u56f4\u7ed5\u4e00\u6b21 Mono \u6216 Flux \u7684\u88c5\u914d\u8c03\u7528\u7ed1\u5b9a Scoped Value，\u4e0d\u4f1a\u81ea\u52a8\u8986\u76d6\u540e\u7eed\u5f02\u6b65\u6267\u884c\u9636\u6bb5，\u5e94\u4f7f\u7528 Reactor Context \u548c\u76f8\u5e94\u6846\u67b6\u673a\u5236\u3002<\/p>\n

                              \u5341\u4e8c\u3001\u4e0e MDC \u65e5\u5fd7\u4e0a\u4e0b\u6587\u5982\u4f55\u914d\u5408<\/h3>\n

                              \u5f88\u591a\u9879\u76ee\u5df2\u7ecf\u4f7f\u7528 SLF4J MDC \u8f93\u51fa %X{traceId}\u3002<\/p>\n

                              \u8fc1\u79fb Scoped Value \u540e，\u4e0d\u8981\u9ed8\u8ba4\u65e5\u5fd7\u6846\u67b6\u4f1a\u81ea\u52a8\u8bfb\u53d6\u5b83\u3002\u662f\u5426\u9700\u8981\u4fdd\u7559 MDC，\u53d6\u51b3\u4e8e\u65e5\u5fd7\u5b9e\u73b0\u548c\u73b0\u6709\u7ec4\u4ef6：<\/p>\n

                                \n
                              • \u4e1a\u52a1\u4ee3\u7801\u6539\u7528 Scoped Value；<\/li>\n
                              • \u65e5\u5fd7 Pattern \u4ecd\u8bfb\u53d6 MDC；<\/li>\n
                              • \u7b2c\u4e09\u65b9\u5e93\u4ecd\u4ece MDC \u53d6 trace ID；<\/li>\n
                              • \u5f02\u6b65\u65e5\u5fd7\u548c\u5f02\u6b65\u4efb\u52a1\u53e6\u6709\u4f20\u64ad\u914d\u7f6e\u3002<\/li>\n<\/ul>\n

                                \u8fc7\u6e21\u671f\u53ef\u4ee5\u5728\u8bf7\u6c42\u5165\u53e3\u540c\u65f6\u7ed1\u5b9a\u4e24\u8005：<\/p>\n

                                ScopedValue<\/span>.<\/span>where<\/span>(<\/span>CONTEXT<\/span>,<\/span> context)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                                \n String<\/span> previous =<\/span> org.<\/span>slf4j.<\/span>MDC<\/span>.<\/span>get<\/span>(<\/span>"traceId"<\/span>)<\/span>;<\/span>
                                \n org.<\/span>slf4j.<\/span>MDC<\/span>.<\/span>put<\/span>(<\/span>"traceId"<\/span>,<\/span> context.<\/span>traceId<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                                \n try<\/span> {<\/span>
                                \n handleRequest<\/span>(<\/span>)<\/span>;<\/span>
                                \n }<\/span> finally<\/span> {<\/span>
                                \n if<\/span> (<\/span>previous ==<\/span> null<\/span>)<\/span> {<\/span>
                                \n org.<\/span>slf4j.<\/span>MDC<\/span>.<\/span>remove<\/span>(<\/span>"traceId"<\/span>)<\/span>;<\/span>
                                \n }<\/span> else<\/span> {<\/span>
                                \n org.<\/span>slf4j.<\/span>MDC<\/span>.<\/span>put<\/span>(<\/span>"traceId"<\/span>,<\/span> previous)<\/span>;<\/span>
                                \n }<\/span>
                                \n }<\/span>
                                \n}<\/span>)<\/span>;<\/span><\/p>\n

                                \u8fd9\u91cc\u4fdd\u5b58\u5e76\u6062\u590d\u65e7\u503c，\u662f\u4e3a\u4e86\u517c\u5bb9\u5d4c\u5957\u8c03\u7528；\u7b80\u5355\u7c97\u66b4\u5730 remove() \u53ef\u80fd\u628a\u5916\u5c42\u4e0a\u4e0b\u6587\u4e00\u8d77\u6e05\u6389\u3002<\/p>\n

                                \u8fd8\u8981\u6ce8\u610f：StructuredTaskScope \u5b50\u4efb\u52a1\u7ee7\u627f Scoped Value，\u4e0d\u7b49\u4e8e MDC \u4e5f\u81ea\u52a8\u7ee7\u627f\u3002 \u5982\u679c\u5b50\u4efb\u52a1\u65e5\u5fd7\u4ecd\u8d70 MDC，\u9700\u8981\u5728\u5b50\u4efb\u52a1\u5165\u53e3\u5355\u72ec\u8bbe\u7f6e\u5e76\u6e05\u7406，\u6216\u8005\u4f7f\u7528\u65e5\u5fd7\u6846\u67b6\u652f\u6301\u7684\u4f20\u64ad\u65b9\u5f0f\u3002<\/p>\n

                                \u957f\u671f\u662f\u5426\u80fd\u628a MDC \u5b8c\u5168\u79fb\u9664，\u8981\u6839\u636e\u6240\u7528\u65e5\u5fd7\u6846\u67b6\u7248\u672c\u7684\u771f\u5b9e\u652f\u6301\u60c5\u51b5\u51b3\u5b9a，\u4e0d\u5e94\u7531 Scoped Value \u7684 API \u72b6\u6001\u76f4\u63a5\u63a8\u65ad\u3002<\/p>\n

                                \u5341\u4e09\u3001JUnit 5 \u6d4b\u8bd5：\u91cd\u70b9\u6d4b\u8bd5\u751f\u547d\u5468\u671f，\u800c\u4e0d\u53ea\u662f\u8bfb\u53d6\u503c<\/h3>\n

                                Scoped Value \u7684\u98ce\u9669\u4e3b\u8981\u96c6\u4e2d\u5728\u7ed1\u5b9a\u8fb9\u754c，\u56e0\u6b64\u6d4b\u8bd5\u5e94\u8986\u76d6：<\/p>\n

                                  \n
                                • \u4f5c\u7528\u57df\u5185\u53ef\u8bfb；<\/li>\n
                                • \u4f5c\u7528\u57df\u5916\u672a\u7ed1\u5b9a；<\/li>\n
                                • \u5f02\u5e38\u540e\u6e05\u7406；<\/li>\n
                                • \u5d4c\u5957\u91cd\u7ed1\u5b9a\u540e\u6062\u590d；<\/li>\n
                                • \u591a\u7ebf\u7a0b\u573a\u666f\u662f\u5426\u6309\u8bbe\u8ba1\u4f20\u64ad；<\/li>\n
                                • \u672a\u7ed1\u5b9a\u65f6\u7684\u4e1a\u52a1\u5f02\u5e38\u3002<\/li>\n<\/ul>\n

                                  \u4ee5\u4e0b\u6d4b\u8bd5\u53ef\u4ee5\u76f4\u63a5\u9488\u5bf9\u524d\u9762\u7684\u952e\u548c RequestContext \u7f16\u5199：<\/p>\n

                                  import<\/span> org.<\/span>junit.<\/span>jupiter.<\/span>api.<\/span><\/span>Test<\/span><\/span>;<\/span><\/p>\n

                                  import<\/span> static<\/span> org.<\/span>junit.<\/span>jupiter.<\/span>api.<\/span><\/span>Assertions<\/span>.<\/span>*<\/span><\/span>;<\/span><\/p>\n

                                  class<\/span> ScopedValueContextTest<\/span> {<\/span><\/p>\n

                                  record<\/span> RequestContext<\/span>(<\/span>String<\/span> traceId,<\/span> long<\/span> userId)<\/span> {<\/span>
                                  \n }<\/span><\/p>\n

                                  private<\/span> static<\/span> final<\/span> ScopedValue<\/span><<\/span>RequestContext<\/span>><\/span><\/span> CONTEXT<\/span> =<\/span>
                                  \n ScopedValue<\/span>.<\/span>newInstance<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

                                  @Test<\/span>
                                  \n void<\/span> shouldReadValueOnlyInsideScope<\/span>(<\/span>)<\/span> {<\/span>
                                  \n var<\/span> context =<\/span> new<\/span> RequestContext<\/span>(<\/span>"trace-test"<\/span>,<\/span> 42L<\/span>)<\/span>;<\/span><\/p>\n

                                  assertFalse<\/span>(<\/span>CONTEXT<\/span>.<\/span>isBound<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

                                  ScopedValue<\/span>.<\/span>where<\/span>(<\/span>CONTEXT<\/span>,<\/span> context)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                                  \n assertTrue<\/span>(<\/span>CONTEXT<\/span>.<\/span>isBound<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                                  \n assertEquals<\/span>(<\/span>"trace-test"<\/span>,<\/span> CONTEXT<\/span>.<\/span>get<\/span>(<\/span>)<\/span>.<\/span>traceId<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                                  \n }<\/span>)<\/span>;<\/span><\/p>\n

                                  assertFalse<\/span>(<\/span>CONTEXT<\/span>.<\/span>isBound<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                                  \n }<\/span><\/p>\n

                                  @Test<\/span>
                                  \n void<\/span> shouldClearBindingAfterException<\/span>(<\/span>)<\/span> {<\/span>
                                  \n var<\/span> context =<\/span> new<\/span> RequestContext<\/span>(<\/span>"trace-error"<\/span>,<\/span> 42L<\/span>)<\/span>;<\/span><\/p>\n

                                  assertThrows<\/span>(<\/span>IllegalStateException<\/span>.<\/span>class<\/span>,<\/span> (<\/span>)<\/span> -><\/span> {<\/span>
                                  \n ScopedValue<\/span>.<\/span>where<\/span>(<\/span>CONTEXT<\/span>,<\/span> context)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                                  \n throw<\/span> new<\/span> IllegalStateException<\/span>(<\/span>"\u6d4b\u8bd5\u5f02\u5e38"<\/span>)<\/span>;<\/span>
                                  \n }<\/span>)<\/span>;<\/span>
                                  \n }<\/span>)<\/span>;<\/span><\/p>\n

                                  assertFalse<\/span>(<\/span>CONTEXT<\/span>.<\/span>isBound<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                                  \n }<\/span><\/p>\n

                                  @Test<\/span>
                                  \n void<\/span> shouldRestoreOuterBindingAfterNestedScope<\/span>(<\/span>)<\/span> {<\/span>
                                  \n var<\/span> outer =<\/span> new<\/span> RequestContext<\/span>(<\/span>"trace-outer"<\/span>,<\/span> 1L<\/span>)<\/span>;<\/span>
                                  \n var<\/span> inner =<\/span> new<\/span> RequestContext<\/span>(<\/span>"trace-inner"<\/span>,<\/span> 2L<\/span>)<\/span>;<\/span><\/p>\n

                                  ScopedValue<\/span>.<\/span>where<\/span>(<\/span>CONTEXT<\/span>,<\/span> outer)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                                  \n ScopedValue<\/span>.<\/span>where<\/span>(<\/span>CONTEXT<\/span>,<\/span> inner)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                                  \n assertEquals<\/span>(<\/span>"trace-inner"<\/span>,<\/span> CONTEXT<\/span>.<\/span>get<\/span>(<\/span>)<\/span>.<\/span>traceId<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                                  \n }<\/span>)<\/span>;<\/span><\/p>\n

                                  assertEquals<\/span>(<\/span>"trace-outer"<\/span>,<\/span> CONTEXT<\/span>.<\/span>get<\/span>(<\/span>)<\/span>.<\/span>traceId<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                                  \n }<\/span>)<\/span>;<\/span><\/p>\n

                                  assertFalse<\/span>(<\/span>CONTEXT<\/span>.<\/span>isBound<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                                  \n }<\/span><\/p>\n

                                  @Test<\/span>
                                  \n void<\/span> shouldRejectReadOutsideScope<\/span>(<\/span>)<\/span> {<\/span>
                                  \n assertThrows<\/span>(<\/span>
                                  \n java.<\/span>util.<\/span><\/span>NoSuchElementException<\/span>.<\/span>class<\/span>,<\/span>
                                  \n CONTEXT<\/span>::<\/span>get<\/span>
                                  \n )<\/span>;<\/span>
                                  \n }<\/span>
                                  \n}<\/span><\/p>\n

                                  \u5982\u679c\u4e1a\u52a1\u5c01\u88c5\u4f7f\u7528 RequestContexts.current()，\u8fd8\u5e94\u6d4b\u8bd5\u5b83\u629b\u51fa\u7684\u4e2d\u6587\u4e1a\u52a1\u5f02\u5e38，\u800c\u4e0d\u662f\u53ea\u6d4b\u8bd5\u5e95\u5c42 CONTEXT.get()\u3002<\/p>\n

                                  \u8de8\u7ebf\u7a0b\u6d4b\u8bd5\u4e0d\u8981\u4ec5\u65ad\u8a00\u201c\u4efb\u52a1\u6700\u7ec8\u6210\u529f\u201d，\u8fd8\u8981\u660e\u786e\u65ad\u8a00：<\/p>\n

                                    \n
                                  • \u4f7f\u7528 StructuredTaskScope \u65f6\u5b50\u4efb\u52a1\u8bfb\u5230\u9884\u671f\u503c；<\/li>\n
                                  • \u666e\u901a\u7ebf\u7a0b\u6c60\u672a\u9002\u914d\u65f6\u4e0d\u4f1a\u9519\u8bef\u5047\u8bbe\u7ee7\u627f；<\/li>\n
                                  • \u9002\u914d\u5668\u91cd\u7ed1\u5b9a\u540e\u4efb\u52a1\u7ed3\u675f，\u5de5\u4f5c\u7ebf\u7a0b\u4e0d\u4fdd\u7559\u7ed1\u5b9a；<\/li>\n
                                  • \u5b50\u4efb\u52a1\u91cd\u7ed1\u5b9a\u4e0d\u4f1a\u4fee\u6539\u7236\u4efb\u52a1\u770b\u5230\u7684\u503c\u3002<\/li>\n<\/ul>\n

                                    \u7ed3\u6784\u5316\u5e76\u53d1\u6d4b\u8bd5\u5728 Java 25 \u4e2d\u540c\u6837\u9700\u8981\u4e3a\u6d4b\u8bd5 JVM \u542f\u7528\u5bf9\u5e94\u9884\u89c8\u7279\u6027\u3002<\/p>\n

                                    \u5341\u56db\u3001\u6027\u80fd\u4e0e\u5185\u5b58：\u4e3a\u4ec0\u4e48\u9ad8\u6548，\u4ee5\u53ca\u4f55\u65f6\u53ef\u80fd\u53d8\u6162<\/h3>\n

                                    14.1 \u4e3a\u4ec0\u4e48\u9002\u5408\u5927\u91cf\u7ed3\u6784\u5316\u5b50\u7ebf\u7a0b<\/h4>\n

                                    InheritableThreadLocal \u7684\u53ef\u7ee7\u627f\u6570\u636e\u9700\u8981\u5728\u521b\u5efa\u5b50\u7ebf\u7a0b\u65f6\u5904\u7406\u5e76\u590d\u5236\u76f8\u5e94\u6620\u5c04，\u56e0\u4e3a\u7236\u5b50\u7ebf\u7a0b\u90fd\u53ef\u4ee5\u72ec\u7acb set()\u3002<\/p>\n

                                    Scoped Value \u7684\u7ed1\u5b9a\u5728\u6709\u754c\u4f5c\u7528\u57df\u5185\u4e0d\u53ef\u968f\u610f\u4fee\u6539，\u7ed3\u6784\u5316\u5b50\u7ebf\u7a0b\u53ef\u4ee5\u5171\u4eab\u7ed1\u5b9a\u4fe1\u606f\u3002\u5b98\u65b9\u5b9e\u73b0\u8bf4\u660e\u5c06\u5176\u7ee7\u627f\u6210\u672c\u6982\u62ec\u4e3a\u63a5\u8fd1\u590d\u5236\u4e00\u4e2a\u5f15\u7528，\u800c\u4e0d\u662f\u590d\u5236\u6574\u5f20\u4e0a\u4e0b\u6587\u8868\u3002<\/p>\n

                                    \u8fd9\u5c24\u5176\u9002\u5408：<\/p>\n

                                    \u4e00\u4e2a\u8bf7\u6c42\u4e0a\u4e0b\u6587
                                    \n \u2193
                                    \n\u5927\u91cf\u7ed3\u6784\u5316\u5b50\u4efb\u52a1
                                    \n \u2193
                                    \n\u5171\u4eab\u540c\u4e00\u4e2a\u4e0d\u53ef\u53d8\u4e0a\u4e0b\u6587\u5feb\u7167<\/p>\n

                                    \u4f46\u201c\u7ee7\u627f\u4fbf\u5b9c\u201d\u4e0d\u4ee3\u8868\u521b\u5efa\u7ebf\u7a0b\u3001\u6267\u884c\u4e1a\u52a1\u548c\u8bbf\u95ee\u4e0b\u6e38\u90fd\u6ca1\u6709\u6210\u672c\u3002<\/p>\n

                                    14.2 get() \u7684\u5feb\u901f\u8def\u5f84\u4f9d\u8d56\u5c0f\u578b\u7ebf\u7a0b\u672c\u5730\u7f13\u5b58<\/h4>\n

                                    Java 25 \u5b9e\u73b0\u6587\u6863\u8bf4\u660e：<\/p>\n

                                  • get() \u6700\u521d\u9700\u8981\u67e5\u627e\u5f53\u524d\u7ebf\u7a0b\u5404\u5c42\u4f5c\u7528\u57df\u4e2d\u7684\u6700\u5185\u5c42\u7ed1\u5b9a；<\/li>\n
                                  • \u67e5\u627e\u7ed3\u679c\u4f1a\u8fdb\u5165\u4e00\u4e2a\u8f83\u5c0f\u7684\u6bcf\u7ebf\u7a0b\u7f13\u5b58；<\/li>\n
                                  • \u540e\u7eed\u8bfb\u53d6\u901a\u5e38\u547d\u4e2d\u7f13\u5b58；<\/li>\n
                                  • \u5982\u679c\u7a0b\u5e8f\u5faa\u73af\u4f7f\u7528\u5927\u91cf\u4e0d\u540c Scoped Value，\u7f13\u5b58\u547d\u4e2d\u7387\u4f1a\u4e0b\u964d，\u6027\u80fd\u53ef\u80fd\u53d8\u5dee\u3002<\/li>\n

                                    \u56e0\u6b64\u4e0d\u8981\u628a\u6bcf\u4e2a\u5c0f\u5b57\u6bb5\u90fd\u8bbe\u8ba1\u6210\u72ec\u7acb Scoped Value：<\/p>\n

                                    \/\/ \u5927\u91cf\u788e\u7247\u952e\u4f1a\u589e\u52a0\u7ba1\u7406\u548c\u7f13\u5b58\u538b\u529b<\/span>
                                    \nTRACE_ID<\/span>
                                    \nUSER_ID<\/span>
                                    \nTENANT_ID<\/span>
                                    \nLOCALE<\/span>
                                    \nCLIENT_IP<\/span>
                                    \nREQUEST_TIME<\/span>
                                    \n\/\/ …<\/span><\/p>\n

                                    \u5982\u679c\u5b83\u4eec\u603b\u662f\u5171\u540c\u51fa\u73b0，\u805a\u5408\u6210\u4e00\u4e2a\u4e0d\u53ef\u53d8\u4e0a\u4e0b\u6587\u901a\u5e38\u66f4\u5408\u9002：<\/p>\n

                                    ScopedValue<\/span><<\/span>RequestContext<\/span>><\/span><\/span><\/p>\n

                                    14.3 Java 25 \u4e2d\u7684\u5b9e\u73b0\u8c03\u4f18\u53c2\u6570\u4e0d\u662f\u5e38\u89c4\u4e1a\u52a1\u5f00\u5173<\/h4>\n

                                    Java 25 \u53c2\u8003\u5b9e\u73b0\u63d0\u4f9b：<\/p>\n\n\u53c2\u6570\u4f5c\u7528\u6ce8\u610f\u4e8b\u9879<\/tr>\n\n\n\n
                                    java.lang.ScopedValue.cacheSize<\/td>\n\u63a7\u5236\u6bcf\u7ebf\u7a0b Scoped Value \u7f13\u5b58\u5927\u5c0f<\/td>\n\u9ed8\u8ba4 16，\u53ef\u914d\u7f6e\u4e3a 2～16 \u7684 2 \u7684\u5e42<\/td>\n<\/tr>\n
                                    jdk.preserveScopedValueCache<\/td>\n\u865a\u62df\u7ebf\u7a0b\u963b\u585e\u65f6\u662f\u5426\u4fdd\u7559 Scoped Value \u7f13\u5b58<\/td>\n\u9ed8\u8ba4 true；\u5173\u95ed\u53ef\u80fd\u7701\u5185\u5b58，\u4f46\u6062\u590d\u540e\u9700\u91cd\u5efa\u7f13\u5b58<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                    \u8fd9\u4e9b\u5c5e\u4e8e\u5b9e\u73b0\u8bf4\u660e，\u4e0d\u5e94\u89c6\u4e3a\u6240\u6709 JDK\u3001\u6240\u6709\u672a\u6765\u7248\u672c\u90fd\u4fdd\u8bc1\u4e0d\u53d8\u7684\u901a\u7528\u89c4\u8303\u3002<\/p>\n

                                    \u5e38\u89c4\u9879\u76ee\u4e0d\u5e94\u4e00\u4e0a\u6765\u5c31\u6dfb\u52a0\u8fd9\u4e9b\u53c2\u6570\u3002\u53ea\u6709\u5728\u6027\u80fd\u5206\u6790\u8bc1\u660e\u7f13\u5b58\u67e5\u627e\u6216\u5927\u91cf\u963b\u585e\u865a\u62df\u7ebf\u7a0b\u7684\u5185\u5b58\u5360\u7528\u786e\u5b9e\u662f\u74f6\u9888\u540e，\u624d\u503c\u5f97\u505a\u5bf9\u7167\u5b9e\u9a8c\u3002<\/p>\n

                                    14.4 \u4e0d\u8981\u7528\u51e0\u4e2a System.nanoTime \u5c31\u5ba3\u5e03\u6027\u80fd\u7ed3\u8bba<\/h4>\n

                                    \u6bd4\u8f83 ThreadLocal \u4e0e Scoped Value \u65f6，\u81f3\u5c11\u5e94\u533a\u5206：<\/p>\n

                                      \n
                                    • \u5355\u6b21\u8bfb\u53d6\u5ef6\u8fdf；<\/li>\n
                                    • \u6df1\u5c42\u8c03\u7528\u8bfb\u53d6；<\/li>\n
                                    • \u5927\u91cf\u4e0d\u540c\u952e\u5bfc\u81f4\u7684\u7f13\u5b58\u7ade\u4e89；<\/li>\n
                                    • \u5b50\u4efb\u52a1\u521b\u5efa\u4e0e\u4e0a\u4e0b\u6587\u7ee7\u627f\u6210\u672c；<\/li>\n
                                    • \u767e\u4e07\u7ea7\u865a\u62df\u7ebf\u7a0b\u7684\u5185\u5b58\u5360\u7528；<\/li>\n
                                    • \u4e0a\u4e0b\u6587\u5bf9\u8c61\u672c\u8eab\u7684\u5927\u5c0f；<\/li>\n
                                    • \u541e\u5410\u91cf\u3001\u5c3e\u5ef6\u8fdf\u548c GC，\u800c\u4e0d\u4ec5\u662f\u5355\u6b21 get()\u3002<\/li>\n<\/ul>\n

                                      \u5fae\u57fa\u51c6\u5efa\u8bae\u4f7f\u7528 JMH，\u5e76\u5206\u522b\u6d4b\u91cf\u201c\u8bfb\u53d6\u201d\u548c\u201c\u521b\u5efa\u5b50\u4efb\u52a1\u201d\u8def\u5f84\u3002\u4e1a\u52a1\u6536\u76ca\u5219\u8981\u5728\u771f\u5b9e\u8bf7\u6c42\u3001\u771f\u5b9e\u7ebf\u7a0b\u6a21\u578b\u548c\u771f\u5b9e\u4e0a\u4e0b\u6587\u5927\u5c0f\u4e0b\u9a8c\u8bc1\u3002<\/p>\n

                                      Scoped Value \u7684\u8bbe\u8ba1\u4f18\u52bf\u4e0d\u7b49\u4e8e\u6bcf\u4e2a\u5e94\u7528\u8fc1\u79fb\u540e\u90fd\u4f1a\u66f4\u5feb\u3002 \u5bf9\u4f4e\u5e76\u53d1\u3001\u5c11\u91cf\u4e0a\u4e0b\u6587\u7684\u7cfb\u7edf，\u6700\u660e\u663e\u7684\u6536\u76ca\u53ef\u80fd\u53ea\u662f\u4ee3\u7801\u66f4\u5bb9\u6613\u63a8\u7406\u548c\u6d4b\u8bd5\u3002<\/p>\n

                                      \u5341\u4e94\u3001ThreadLocal \u4e0e Scoped Value \u5168\u9762\u5bf9\u6bd4<\/h3>\n\n\u7ef4\u5ea6ThreadLocalScoped Value<\/tr>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
                                      \u57fa\u672c\u89d2\u8272<\/td>\n\u6bcf\u7ebf\u7a0b\u53ef\u53d8\u53d8\u91cf<\/td>\n\u52a8\u6001\u4f5c\u7528\u57df\u4e2d\u7684\u53ea\u8bfb\u7ed1\u5b9a\u952e<\/td>\n<\/tr>\n
                                      \u5199\u5165\u65b9\u5f0f<\/td>\nset()，\u53ef\u5728\u4efb\u610f\u65f6\u523b\u8c03\u7528<\/td>\nwhere(…).run\/call，\u5fc5\u987b\u6709\u6267\u884c\u8fb9\u754c<\/td>\n<\/tr>\n
                                      \u5f53\u524d\u4f5c\u7528\u57df\u91cd\u65b0\u8d4b\u503c<\/td>\n\u53ef\u4ee5\u76f4\u63a5\u4fee\u6539<\/td>\n\u4e0d\u80fd set，\u53ea\u80fd\u5d4c\u5957\u91cd\u7ed1\u5b9a<\/td>\n<\/tr>\n
                                      \u9ed8\u8ba4\u672a\u8bbe\u7f6e\u8bfb\u53d6<\/td>\n\u901a\u5e38\u8fd4\u56de null<\/td>\nget() \u629b NoSuchElementException<\/td>\n<\/tr>\n
                                      \u6e05\u7406\u65b9\u5f0f<\/td>\n\u624b\u52a8 remove()，\u6216\u7b49\u5f85\u7ebf\u7a0b\u7ed3\u675f<\/td>\n\u64cd\u4f5c\u7ed3\u675f\u540e\u81ea\u52a8\u89e3\u9664\u6216\u6062\u590d\u5916\u5c42\u7ed1\u5b9a<\/td>\n<\/tr>\n
                                      \u5d4c\u5957\u4e0a\u4e0b\u6587<\/td>\n\u624b\u52a8\u4fdd\u5b58\u65e7\u503c\u5e76\u6062\u590d<\/td>\n\u81ea\u52a8\u6062\u590d\u5916\u5c42\u7ed1\u5b9a<\/td>\n<\/tr>\n
                                      \u6570\u636e\u6d41<\/td>\n\u53ef\u53cc\u5411\u3001\u53ef\u8de8\u4efb\u610f\u65b9\u6cd5\u4fee\u6539<\/td>\n\u4e3b\u8981\u7528\u4e8e\u8c03\u7528\u8005\u5411\u88ab\u8c03\u7528\u8005\u5355\u5411\u4f20\u9012<\/td>\n<\/tr>\n
                                      \u8de8\u7ebf\u7a0b\u7ee7\u627f<\/td>\nInheritableThreadLocal \u5728\u7ebf\u7a0b\u521b\u5efa\u65f6\u5904\u7406<\/td>\nJava 25 \u901a\u8fc7 StructuredTaskScope \u7ed3\u6784\u5316\u7ee7\u627f<\/td>\n<\/tr>\n
                                      \u666e\u901a\u7ebf\u7a0b\u6c60\u4efb\u52a1<\/td>\n\u4e0d\u81ea\u52a8\u6309\u4efb\u52a1\u7ee7\u627f<\/td>\n\u540c\u6837\u4e0d\u81ea\u52a8\u6309\u4efb\u52a1\u7ee7\u627f<\/td>\n<\/tr>\n
                                      \u865a\u62df\u7ebf\u7a0b<\/td>\n\u652f\u6301<\/td>\n\u652f\u6301<\/td>\n<\/tr>\n
                                      \u6bcf\u7ebf\u7a0b\u957f\u671f\u7f13\u5b58<\/td>\n\u53ef\u4ee5<\/td>\n\u4e0d\u9002\u5408，\u7ed1\u5b9a\u5e94\u968f\u64cd\u4f5c\u7ed3\u675f<\/td>\n<\/tr>\n
                                      \u5f02\u6b65\u6d41<\/td>\n\u9700\u8981\u6846\u67b6\u9002\u914d<\/td>\n\u540c\u6837\u9700\u8981\u6846\u67b6\u9002\u914d<\/td>\n<\/tr>\n
                                      \u503c\u672c\u8eab\u4e0d\u53ef\u53d8<\/td>\n\u4e0d\u4fdd\u8bc1<\/td>\n\u4e5f\u4e0d\u4fdd\u8bc1，\u9700\u8981\u81ea\u884c\u8bbe\u8ba1<\/td>\n<\/tr>\n
                                      Java 25 \u72b6\u6001<\/td>\n\u957f\u671f\u6b63\u5f0f API<\/td>\n\u6b63\u5f0f API<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                      \u6700\u503c\u5f97\u8bb0\u4f4f\u7684\u4e0d\u662f\u201c\u8c01\u66ff\u4ee3\u8c01\u201d，\u800c\u662f：<\/p>\n

                                      ThreadLocal \u662f\u901a\u7528\u7684\u6bcf\u7ebf\u7a0b\u53ef\u53d8\u5b58\u50a8；Scoped Value \u662f\u6709\u8fb9\u754c\u7684\u5355\u5411\u4e0a\u4e0b\u6587\u4f20\u9012\u3002<\/p>\n

                                      \u4e24\u8005\u80fd\u529b\u96c6\u5408\u4e0d\u540c\u3002<\/p>\n

                                      \u5341\u516d\u3001\u4ece ThreadLocal \u8fc1\u79fb\u7684\u5b9e\u7528\u6b65\u9aa4<\/h3>\n

                                      \u7b2c\u4e00\u6b65：\u5148\u7ed9\u73b0\u6709\u7528\u9014\u5206\u7c7b<\/h4>\n

                                      \u641c\u7d22\u6240\u6709 ThreadLocal \u548c InheritableThreadLocal，\u6309\u7528\u9014\u5206\u7c7b：<\/p>\n\n\u73b0\u6709\u7528\u9014\u662f\u5426\u9002\u5408\u8fc1\u79fb<\/tr>\n\n\n\n\n\n\n\n\n
                                      \u8bf7\u6c42 trace ID\u3001\u53ea\u8bfb\u7528\u6237\u5feb\u7167<\/td>\n\u901a\u5e38\u9002\u5408<\/td>\n<\/tr>\n
                                      \u53ea\u8bfb\u79df\u6237\u4e0a\u4e0b\u6587\u3001\u8bed\u8a00\u73af\u5883<\/td>\n\u901a\u5e38\u9002\u5408<\/td>\n<\/tr>\n
                                      \u9012\u5f52\u68c0\u6d4b\u3001\u5d4c\u5957\u4e8b\u52a1\u6807\u8bb0<\/td>\n\u901a\u5e38\u9002\u5408，\u5229\u7528 isBound \u6216\u91cd\u7ed1\u5b9a<\/td>\n<\/tr>\n
                                      \u6df1\u5c42\u88ab\u8c03\u7528\u8005\u901a\u8fc7 set \u5411\u8c03\u7528\u8005\u56de\u4f20\u6570\u636e<\/td>\n\u4e0d\u9002\u5408\u76f4\u63a5\u8fc1\u79fb，\u5e94\u5148\u91cd\u6784\u6570\u636e\u6d41<\/td>\n<\/tr>\n
                                      \u6bcf\u7ebf\u7a0b\u7f13\u5b58\u6602\u8d35\u3001\u53ef\u53d8\u5bf9\u8c61<\/td>\n\u901a\u5e38\u4e0d\u9002\u5408<\/td>\n<\/tr>\n
                                      \u4efb\u610f\u5f02\u6b65\u4efb\u52a1\u4e4b\u95f4\u5171\u4eab<\/td>\n\u4e0d\u80fd\u53ea\u9760 Scoped Value \u89e3\u51b3<\/td>\n<\/tr>\n
                                      \u4e3a\u517c\u5bb9\u8001\u6846\u67b6\u4fdd\u5b58\u7684 MDC\u3001SecurityContext<\/td>\n\u6309\u6846\u67b6\u652f\u6301\u9010\u6b65\u5904\u7406<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                      \u7b2c\u4e8c\u6b65：\u628a\u4e0a\u4e0b\u6587\u6539\u6210\u771f\u6b63\u4e0d\u53ef\u53d8\u7684\u6570\u636e\u5feb\u7167<\/h4>\n

                                      \u4f18\u5148\u4f7f\u7528 record，\u5e76\u68c0\u67e5：<\/p>\n

                                        \n
                                      • \u96c6\u5408\u662f\u5426 copyOf；<\/li>\n
                                      • \u65e5\u671f\u65f6\u95f4\u662f\u5426\u4f7f\u7528\u4e0d\u53ef\u53d8\u7c7b\u578b；<\/li>\n
                                      • \u662f\u5426\u5305\u542b\u53ef\u5199 POJO；<\/li>\n
                                      • \u662f\u5426\u5305\u542b\u8fde\u63a5\u3001\u6d41\u3001\u9501\u7b49\u751f\u547d\u5468\u671f\u8d44\u6e90；<\/li>\n
                                      • \u662f\u5426\u65e0\u610f\u4fdd\u5b58\u4e86\u6574\u4e2a HTTP Request；<\/li>\n
                                      • \u662f\u5426\u4fdd\u5b58\u4e86\u8fc7\u5927\u7684\u5bf9\u8c61\u56fe\u3002<\/li>\n<\/ul>\n

                                        \u7b2c\u4e09\u6b65：\u628a\u952e\u5c01\u88c5\u8d77\u6765<\/h4>\n

                                        \u63a8\u8350：<\/p>\n

                                        private<\/span> static<\/span> final<\/span> ScopedValue<\/span><<\/span>RequestContext<\/span>><\/span><\/span> CONTEXT<\/span>;<\/span><\/p>\n

                                        \u901a\u8fc7\u5c11\u91cf\u516c\u5f00\u65b9\u6cd5\u63a7\u5236\u8bfb\u53d6\u548c\u7ed1\u5b9a，\u907f\u514d\u6240\u6709\u6a21\u5757\u90fd\u80fd\u53d6\u5f97\u952e\u3002<\/p>\n

                                        \u7b2c\u56db\u6b65：\u5148\u6539\u540c\u6b65\u5165\u53e3<\/h4>\n

                                        \u4ece\u4e00\u4e2a\u660e\u786e\u7684\u540c\u6b65\u5165\u53e3\u5f00\u59cb：<\/p>\n

                                        ScopedValue<\/span>.<\/span>where<\/span>(<\/span>CONTEXT<\/span>,<\/span> context)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                                        \n \/\/ \u6574\u4e2a\u540c\u6b65\u4e1a\u52a1\u8c03\u7528\u94fe<\/span>
                                        \n}<\/span>)<\/span>;<\/span><\/p>\n

                                        \u9a8c\u8bc1\u6b63\u5e38\u8fd4\u56de\u3001\u4e1a\u52a1\u5f02\u5e38\u548c\u7cfb\u7edf\u5f02\u5e38\u540e\u7684\u7ed1\u5b9a\u72b6\u6001\u3002<\/p>\n

                                        \u7b2c\u4e94\u6b65：\u5355\u72ec\u5904\u7406\u7ebf\u7a0b\u5207\u6362<\/h4>\n

                                        \u5217\u51fa\u6240\u6709：<\/p>\n

                                          \n
                                        • new Thread；<\/li>\n
                                        • \u865a\u62df\u7ebf\u7a0b\u521b\u5efa；<\/li>\n
                                        • \u7ebf\u7a0b\u6c60；<\/li>\n
                                        • @Async；<\/li>\n
                                        • CompletableFuture；<\/li>\n
                                        • \u5e76\u884c\u6d41；<\/li>\n
                                        • \u8c03\u5ea6\u5668；<\/li>\n
                                        • Reactor \/ RxJava；<\/li>\n
                                        • \u6d88\u606f\u56de\u8c03\u3002<\/li>\n<\/ul>\n

                                          \u80fd\u4f7f\u7528\u7ed3\u6784\u5316\u5e76\u53d1\u7684，\u660e\u786e\u7236\u5b50\u751f\u547d\u5468\u671f\u540e\u4f7f\u7528 StructuredTaskScope；\u5fc5\u987b\u4f7f\u7528\u65e7\u7ebf\u7a0b\u6c60\u7684，\u63d0\u4ea4\u65f6\u6355\u83b7\u5e76\u91cd\u65b0\u7ed1\u5b9a；\u54cd\u5e94\u5f0f\u94fe\u8def\u4f7f\u7528\u5bf9\u5e94\u4e0a\u4e0b\u6587\u673a\u5236\u3002<\/p>\n

                                          \u7b2c\u516d\u6b65：\u4fdd\u7559\u5fc5\u8981\u6865\u63a5，\u518d\u9010\u6b65\u79fb\u9664\u65e7\u4ee3\u7801<\/h4>\n

                                          MDC\u3001\u5b89\u5168\u6846\u67b6\u548c\u7b2c\u4e09\u65b9\u5e93\u4e0d\u4e00\u5b9a\u540c\u6b65\u652f\u6301 Scoped Value\u3002\u8fc1\u79fb\u671f\u95f4\u5141\u8bb8\u6865\u63a5\u5b58\u5728，\u4f46\u8981\u6709\u660e\u786e\u8fb9\u754c：<\/p>\n

                                          \u4e1a\u52a1\u4ee3\u7801：Scoped Value
                                          \n\u65e5\u5fd7\u8f93\u51fa：\u6682\u65f6\u6865\u63a5 MDC
                                          \n\u5b89\u5168\u8ba4\u8bc1：\u7ee7\u7eed\u4f7f\u7528\u5b89\u5168\u6846\u67b6\u81ea\u5df1\u7684\u4e0a\u4e0b\u6587
                                          \n\u65e7\u7ebf\u7a0b\u6c60：\u663e\u5f0f\u4efb\u52a1\u88c5\u9970\u5668<\/p>\n

                                          \u4e0d\u8981\u4e00\u6b21\u91cd\u5199\u6574\u4e2a\u7cfb\u7edf\u7684\u4e0a\u4e0b\u6587\u4f53\u7cfb\u3002<\/p>\n

                                          \u7b2c\u4e03\u6b65：\u8865\u6d4b\u8bd5\u548c\u89c2\u6d4b<\/h4>\n

                                          \u81f3\u5c11\u9a8c\u8bc1：<\/p>\n

                                            \n
                                          • \u8fde\u7eed\u8bf7\u6c42\u4e0d\u4f1a\u4e32\u4e0a\u4e0b\u6587；<\/li>\n
                                          • \u5f02\u5e38\u8bf7\u6c42\u540e\u6ca1\u6709\u6b8b\u7559；<\/li>\n
                                          • \u5d4c\u5957\u8c03\u7528\u6062\u590d\u6b63\u786e；<\/li>\n
                                          • \u591a\u7528\u6237\u5e76\u53d1\u4e0d\u4f1a\u4e32\u7528\u6237；<\/li>\n
                                          • \u5b50\u4efb\u52a1\u884c\u4e3a\u7b26\u5408\u8bbe\u8ba1；<\/li>\n
                                          • \u65e5\u5fd7 trace ID \u4e0e\u4e1a\u52a1\u4e0a\u4e0b\u6587\u4e00\u81f4；<\/li>\n
                                          • \u5185\u5b58\u3001\u541e\u5410\u548c\u5c3e\u5ef6\u8fdf\u6ca1\u6709\u5f02\u5e38\u56de\u9000\u3002<\/li>\n<\/ul>\n

                                            \u5341\u4e03\u3001\u6700\u5e38\u89c1\u7684\u8bef\u7528\u4e0e\u6392\u67e5<\/h3>\n

                                            \u8bef\u533a 1：\u628a Java 21～23 \u793a\u4f8b\u76f4\u63a5\u590d\u5236\u5230 Java 25<\/h4>\n

                                            \u65e9\u671f\u8d44\u6599\u53ef\u80fd\u51fa\u73b0：<\/p>\n

                                            ScopedValue<\/span>.<\/span>runWhere<\/span>(<\/span>.<\/span>.<\/span>.<\/span>)<\/span>;<\/span>
                                            \nScopedValue<\/span>.<\/span>callWhere<\/span>(<\/span>.<\/span>.<\/span>.<\/span>)<\/span>;<\/span>
                                            \nScopedValue<\/span>.<\/span>getWhere<\/span>(<\/span>.<\/span>.<\/span>.<\/span>)<\/span>;<\/span><\/p>\n

                                            Java 25 \u6700\u7ec8 API \u5e94\u4f7f\u7528：<\/p>\n

                                            ScopedValue<\/span>.<\/span>where<\/span>(<\/span>KEY<\/span>,<\/span> value)<\/span>.<\/span>run<\/span>(<\/span>.<\/span>.<\/span>.<\/span>)<\/span>;<\/span>
                                            \nScopedValue<\/span>.<\/span>where<\/span>(<\/span>KEY<\/span>,<\/span> value)<\/span>.<\/span>call<\/span>(<\/span>.<\/span>.<\/span>.<\/span>)<\/span>;<\/span><\/p>\n

                                            \u5176\u4e2d runWhere\u3001callWhere \u5728 Java 24 \u7b2c\u56db\u6b21\u9884\u89c8\u65f6\u5df2\u79fb\u9664，getWhere \u66f4\u65e9\u88ab\u79fb\u9664\u3002<\/p>\n

                                            \u8bef\u533a 2：\u5728 run \u5916\u8bfb\u53d6，\u7591\u60d1\u4e3a\u4ec0\u4e48\u629b\u5f02\u5e38<\/h4>\n

                                            ScopedValue<\/span>.<\/span>where<\/span>(<\/span>KEY<\/span>,<\/span> value)<\/span>.<\/span>run<\/span>(<\/span>task)<\/span>;<\/span>
                                            \nKEY<\/span>.<\/span>get<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u5df2\u89e3\u7ed1<\/span><\/p>\n

                                            \u5e94\u628a\u8bfb\u53d6\u653e\u8fdb\u64cd\u4f5c\u5185\u90e8，\u6216\u901a\u8fc7 call \u628a\u7ed3\u679c\u8fd4\u56de：<\/p>\n

                                            var<\/span> result =<\/span> ScopedValue<\/span>.<\/span>where<\/span>(<\/span>KEY<\/span>,<\/span> value)<\/span>.<\/span>call<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                                            \n return<\/span> buildResult<\/span>(<\/span>KEY<\/span>.<\/span>get<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
                                            \n}<\/span>)<\/span>;<\/span><\/p>\n

                                            \u8bef\u533a 3：\u628a orElse \u5f53\u6210 get \u7684\u901a\u7528\u7a7a\u503c\u4fdd\u62a4<\/h4>\n

                                            KEY<\/span>.<\/span>orElse<\/span>(<\/span>defaultValue)<\/span>;<\/span><\/p>\n

                                            \u5b83\u53ea\u5904\u7406\u201c\u672a\u7ed1\u5b9a\u201d，\u4e0d\u4f1a\u5904\u7406\u201c\u5df2\u7ed1\u5b9a null\u201d，\u800c\u4e14 Java 25 \u4e0d\u5141\u8bb8 orElse(null)\u3002<\/p>\n

                                            \u8bef\u533a 4：\u7528 orElse \u63a9\u76d6\u5fc5\u9700\u7684\u4e0a\u4e0b\u6587\u7f3a\u5931<\/h4>\n

                                            long<\/span> userId =<\/span> USER_ID<\/span>.<\/span>orElse<\/span>(<\/span>0L<\/span>)<\/span>;<\/span><\/p>\n

                                            \u5982\u679c 0 \u4e0d\u662f\u5408\u6cd5\u4e14\u6709\u660e\u786e\u8bed\u4e49\u7684\u533f\u540d\u7528\u6237，\u8fd9\u53ef\u80fd\u628a\u5165\u53e3\u9519\u8bef\u53d8\u6210\u9519\u8bef\u6570\u636e\u3002\u8eab\u4efd\u3001\u79df\u6237\u7b49\u5b89\u5168\u76f8\u5173\u4e0a\u4e0b\u6587\u901a\u5e38\u5e94\u5feb\u901f\u5931\u8d25\u3002<\/p>\n

                                            \u8bef\u533a 5：\u8ba4\u4e3a\u865a\u62df\u7ebf\u7a0b\u5929\u7136\u7ee7\u627f<\/h4>\n

                                            \u666e\u901a Thread.startVirtualThread \u4e0d\u7b49\u4e8e StructuredTaskScope.fork，\u4e0d\u4f1a\u81ea\u52a8\u7ee7\u627f Scoped Value\u3002<\/p>\n

                                            \u8bef\u533a 6：\u628a\u4efb\u52a1\u63d0\u4ea4\u5230\u7ebf\u7a0b\u6c60，\u671f\u5f85\u6355\u83b7\u63d0\u4ea4\u73b0\u573a<\/h4>\n

                                            \u5de5\u4f5c\u7ebf\u7a0b\u53ea\u770b\u5230\u81ea\u5df1\u6267\u884c\u65f6\u7684\u7ed1\u5b9a\u3002\u5fc5\u987b\u5728\u63d0\u4ea4\u7ebf\u7a0b\u6355\u83b7\u503c，\u518d\u5728\u5de5\u4f5c\u7ebf\u7a0b\u91cd\u7ed1\u5b9a\u3002<\/p>\n

                                            \u8bef\u533a 7：\u5148\u6253\u5f00 StructuredTaskScope，\u518d\u4e34\u65f6\u7ed1\u5b9a\u4e0a\u4e0b\u6587<\/h4>\n

                                            \u7ee7\u627f\u7ed1\u5b9a\u5728\u6253\u5f00 scope \u65f6\u6355\u83b7\u3002\u5e94\u5148 where(…).run\/call，\u518d\u5728\u5176\u5185\u90e8\u6253\u5f00 scope\u3002<\/p>\n

                                            \u8bef\u533a 8：\u53ea\u8ba9 record \u5916\u58f3\u4e0d\u53ef\u53d8，\u5185\u90e8\u96c6\u5408\u4ecd\u53ef\u5199<\/h4>\n

                                            \u8de8\u7ebf\u7a0b\u5171\u4eab\u524d\u5e94\u68c0\u67e5\u6574\u4e2a\u5bf9\u8c61\u56fe，\u800c\u4e0d\u662f\u53ea\u770b\u5b57\u6bb5\u662f\u4e0d\u662f final\u3002<\/p>\n

                                            \u8bef\u533a 9：\u516c\u5f00 ScopedValue \u952e<\/h4>\n

                                            \u952e\u662f\u4e00\u79cd\u8bbf\u95ee\u80fd\u529b\u3002\u516c\u5f00\u952e\u610f\u5473\u7740\u5176\u4ed6\u4ee3\u7801\u53ef\u4ee5\u8bfb\u53d6\u548c\u5d4c\u5957\u91cd\u7ed1\u5b9a\u3002\u4f18\u5148\u901a\u8fc7\u79c1\u6709\u952e\u4e0e\u516c\u5f00\u8bed\u4e49\u65b9\u6cd5\u5c01\u88c5\u3002<\/p>\n

                                            \u8bef\u533a 10：\u628a\u7ed1\u5b9a\u81ea\u52a8\u6e05\u7406\u7406\u89e3\u4e3a\u5bf9\u8c61\u7acb\u5373\u9500\u6bc1<\/h4>\n

                                            \u81ea\u52a8\u6e05\u7406\u7684\u662f\u7ed1\u5b9a\u5173\u7cfb\u3002\u5bf9\u8c61\u4ecd\u53ef\u80fd\u88ab\u8c03\u7528\u6808\u3001\u7f13\u5b58\u3001\u9759\u6001\u96c6\u5408\u6216\u6392\u961f\u4efb\u52a1\u5f15\u7528\u3002<\/p>\n

                                            \u8bef\u533a 11：\u56f4\u7ed5\u5f02\u6b65\u6d41\u88c5\u914d\u7ed1\u5b9a，\u671f\u5f85\u6267\u884c\u9636\u6bb5\u53ef\u89c1<\/h4>\n

                                            Mono\u3001Flux\u3001\u56de\u8c03\u548c CompletableFuture \u7684\u5b9e\u9645\u6267\u884c\u53ef\u80fd\u53d1\u751f\u5728\u5176\u4ed6\u7ebf\u7a0b\u3001\u5176\u4ed6\u65f6\u95f4，\u5fc5\u987b\u91c7\u7528\u5bf9\u5e94\u5f02\u6b65\u4e0a\u4e0b\u6587\u4f20\u64ad\u65b9\u6848\u3002<\/p>\n

                                            \u8bef\u533a 12：\u4e00\u6b21\u6027\u66ff\u6362\u6240\u6709 ThreadLocal<\/h4>\n

                                            \u6bcf\u7ebf\u7a0b\u7f13\u5b58\u3001\u53cc\u5411\u6570\u636e\u6d41\u3001\u975e\u7ed3\u6784\u5316\u751f\u547d\u5468\u671f\u5e76\u4e0d\u7b26\u5408 Scoped Value \u7684\u76ee\u6807\u3002\u5f3a\u884c\u66ff\u6362\u53ea\u4f1a\u8ba9\u4ee3\u7801\u66f4\u7ed5\u3002<\/p>\n

                                            \u8bef\u533a 13：\u7ed1\u5b9a\u51e0\u5341\u4e2a\u72ec\u7acb\u952e<\/h4>\n

                                            \u5927\u91cf\u5faa\u73af\u4f7f\u7528\u7684 Scoped Value \u53ef\u80fd\u964d\u4f4e\u5c0f\u578b\u7f13\u5b58\u547d\u4e2d\u7387\u3002\u5171\u540c\u51fa\u73b0\u7684\u5b57\u6bb5\u4f18\u5148\u805a\u5408\u6210\u4e00\u4e2a\u4e0d\u53ef\u53d8\u5bf9\u8c61\u3002<\/p>\n

                                            \u8bef\u533a 14：\u628a\u5b83\u5f53\u6210\u6388\u6743\u8fb9\u754c<\/h4>\n

                                            \u4e0a\u4e0b\u6587\u53ef\u4ee5\u88ab\u6b63\u786e\u5c01\u88c5\u548c\u4f20\u9012，\u4e0d\u4ee3\u8868\u7528\u6237\u5df2\u7ecf\u8ba4\u8bc1，\u4e5f\u4e0d\u4ee3\u8868\u79df\u6237\u6821\u9a8c\u5df2\u7ecf\u5b8c\u6210\u3002\u6388\u6743\u4ecd\u8981\u7531\u53ef\u4fe1\u8ba4\u8bc1\u7ed3\u679c\u548c\u660e\u786e\u4e1a\u52a1\u89c4\u5219\u5b8c\u6210\u3002<\/p>\n

                                            \u5341\u516b\u3001\u9002\u5408\u4e0e\u4e0d\u9002\u5408\u7684\u5178\u578b\u573a\u666f<\/h3>\n

                                            \u9002\u5408：\u8bf7\u6c42\u4e0a\u4e0b\u6587<\/h4>\n

                                            Web \u5165\u53e3\u521b\u5efa\u4e0d\u53ef\u53d8 RequestContext
                                            \n \u2193
                                            \nController \/ Service \/ Repository \/ Audit \u8bfb\u53d6
                                            \n \u2193
                                            \n\u8bf7\u6c42\u7ed3\u675f\u540e\u81ea\u52a8\u89e3\u7ed1<\/p>\n

                                            \u9002\u5408：\u9012\u5f52\u6216\u91cd\u5165\u68c0\u6d4b<\/h4>\n

                                            if<\/span> (<\/span>IN_OPERATION<\/span>.<\/span>isBound<\/span>(<\/span>)<\/span>)<\/span> {<\/span>
                                            \n throw<\/span> new<\/span> IllegalStateException<\/span>(<\/span>"\u5f53\u524d\u64cd\u4f5c\u4e0d\u5141\u8bb8\u91cd\u5165"<\/span>)<\/span>;<\/span>
                                            \n}<\/span><\/p>\n

                                            ScopedValue<\/span>.<\/span>where<\/span>(<\/span>IN_OPERATION<\/span>,<\/span> Boolean<\/span>.<\/span>TRUE<\/span>)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                                            \n doOperation<\/span>(<\/span>)<\/span>;<\/span>
                                            \n}<\/span>)<\/span>;<\/span><\/p>\n

                                            \u7ed1\u5b9a\u53ea\u5728\u64cd\u4f5c\u671f\u95f4\u5b58\u5728，\u6bd4\u624b\u52a8\u7ef4\u62a4\u5e03\u5c14 ThreadLocal \u66f4\u6e05\u6670\u3002<\/p>\n

                                            \u9002\u5408：\u6241\u5e73\u5316\u5d4c\u5957\u4e8b\u52a1<\/h4>\n

                                            \u5916\u5c42\u5df2\u7ecf\u7ed1\u5b9a\u4e8b\u52a1\u4e0a\u4e0b\u6587\u65f6，\u5185\u5c42\u64cd\u4f5c\u53ef\u4ee5\u9009\u62e9\u52a0\u5165\u5916\u5c42，\u800c\u4e0d\u662f\u521b\u5efa\u72ec\u7acb\u4e8b\u52a1\u3002\u5177\u4f53\u4e8b\u52a1\u7ba1\u7406\u4ecd\u7531\u4e8b\u52a1\u6846\u67b6\u8d1f\u8d23，Scoped Value \u53ea\u8d1f\u8d23\u4e0a\u4e0b\u6587\u53ef\u89c1\u6027\u3002<\/p>\n

                                            \u9002\u5408：\u7ed3\u6784\u5316\u5e76\u53d1\u4e2d\u7684\u53ea\u8bfb\u5feb\u7167<\/h4>\n

                                            \u591a\u4e2a\u5b50\u4efb\u52a1\u8bfb\u53d6\u540c\u4e00\u4e2a\u4e0d\u53ef\u53d8\u7528\u6237\u3001\u79df\u6237\u6216\u8ffd\u8e2a\u5feb\u7167，\u4e0d\u9700\u8981\u590d\u5236\u6bcf\u4efd\u4e0a\u4e0b\u6587\u6620\u5c04\u3002<\/p>\n

                                            \u4e0d\u9002\u5408：SimpleDateFormat \u5f0f\u6bcf\u7ebf\u7a0b\u7f13\u5b58<\/h4>\n

                                            \u5386\u53f2\u4e0a\u5e38\u7528 ThreadLocal \u7f13\u5b58\u975e\u7ebf\u7a0b\u5b89\u5168\u4e14\u521b\u5efa\u6602\u8d35\u7684\u5bf9\u8c61\u3002Scoped Value \u7684\u6709\u754c\u7ed1\u5b9a\u4e0d\u9002\u5408\u8fd9\u79cd\u957f\u671f\u7f13\u5b58\u3002<\/p>\n

                                            \u4e0d\u8fc7\u5bf9\u4e8e\u8fd9\u4e2a\u5177\u4f53\u4f8b\u5b50，\u66f4\u597d\u7684\u73b0\u4ee3\u65b9\u6848\u901a\u5e38\u662f\u76f4\u63a5\u4f7f\u7528\u4e0d\u53ef\u53d8\u3001\u7ebf\u7a0b\u5b89\u5168\u7684 DateTimeFormatter，\u800c\u4e0d\u662f\u7ee7\u7eed\u7f13\u5b58 SimpleDateFormat\u3002<\/p>\n

                                            \u4e0d\u9002\u5408：\u53ef\u53d8\u7d2f\u52a0\u5668<\/h4>\n

                                            \u5982\u679c\u591a\u4e2a\u5b50\u4efb\u52a1\u9700\u8981\u5171\u540c\u66f4\u65b0\u8ba1\u6570\u3001\u5217\u8868\u6216\u6279\u5904\u7406\u72b6\u6001，\u5e94\u4f7f\u7528\u660e\u786e\u7684\u5e76\u53d1\u96c6\u5408\u3001\u539f\u5b50\u53d8\u91cf\u3001\u7ed3\u679c\u5f52\u5e76\u6216\u5176\u4ed6\u5e76\u53d1\u8bbe\u8ba1，\u4e0d\u8981\u628a\u53ef\u53d8\u5bf9\u8c61\u7ed1\u8fdb Scoped Value \u540e\u5f53\u4f5c\u540c\u6b65\u5de5\u5177\u3002<\/p>\n

                                            \u4e0d\u9002\u5408：\u4efb\u610f\u751f\u547d\u5468\u671f\u7684\u5168\u5c40\u72b6\u6001<\/h4>\n

                                            \u5982\u679c\u6570\u636e\u65e0\u6cd5\u56de\u7b54\u201c\u4ece\u54ea\u4e2a\u64cd\u4f5c\u5f00\u59cb，\u5230\u54ea\u4e2a\u64cd\u4f5c\u7ed3\u675f\u201d，\u5b83\u901a\u5e38\u4e0d\u7b26\u5408 Scoped Value \u7684\u6a21\u578b\u3002<\/p>\n

                                            \u5341\u4e5d\u3001\u4e3a\u4ec0\u4e48 API \u6ca1\u6709\u9009\u62e9 try-with-resources<\/h3>\n

                                            \u770b\u5230\u201c\u6709\u4f5c\u7528\u57df\u3001\u81ea\u52a8\u6e05\u7406\u201d，\u5f88\u5bb9\u6613\u60f3\u8c61\u8fd9\u6837\u7684 API：<\/p>\n

                                            \/\/ \u8fd9\u53ea\u662f\u8bbe\u60f3，\u4e0d\u662f Java 25 ScopedValue API<\/span>
                                            \ntry<\/span> (<\/span>var<\/span> scope =<\/span> CONTEXT<\/span>.<\/span>bind<\/span>(<\/span>context)<\/span>)<\/span> {<\/span>
                                            \n \/\/ …<\/span>
                                            \n}<\/span><\/p>\n

                                            JEP 506 \u89e3\u91ca\u4e86\u8bbe\u8ba1\u53d6\u820d：\u5982\u679c\u4f9d\u8d56\u7528\u6237\u8c03\u7528 close()，\u5c31\u65e0\u6cd5\u50cf run\/call \u4e00\u6837\u53ef\u9760\u4fdd\u8bc1\u5b8c\u6574\u6027；\u5373\u4f7f\u5728 try-with-resources \u4e2d\u6309\u8bbe\u8ba1\u8c03\u7528，\u4e5f\u53ef\u80fd\u5728\u5173\u952e\u4f4d\u7f6e\u9047\u5230 StackOverflowError，\u4f7f\u72b6\u6001\u6062\u590d\u53d8\u5f97\u590d\u6742\u3002<\/p>\n

                                            \u6700\u7ec8 API \u9009\u62e9\u63a5\u6536 Runnable \u6216 CallableOp：<\/p>\n

                                            ScopedValue<\/span>.<\/span>where<\/span>(<\/span>CONTEXT<\/span>,<\/span> context)<\/span>.<\/span>run<\/span>(<\/span>operation)<\/span>;<\/span><\/p>\n

                                            \u7531\u5e93\u63a7\u5236\u8fdb\u5165\u3001\u6267\u884c\u548c\u9000\u51fa\u8fc7\u7a0b，\u4ece\u800c\u53ef\u9760\u6062\u590d\u7ed1\u5b9a\u3002<\/p>\n

                                            \u8fd9\u4e5f\u89e3\u91ca\u4e86\u4e3a\u4ec0\u4e48 Scoped Value \u7684\u4ee3\u7801\u5929\u7136\u5448\u73b0\u201c\u56f4\u7ed5\u4e00\u4e2a\u64cd\u4f5c\u201d\u7684\u7ed3\u6784，\u800c\u4e0d\u662f\u201c\u5148\u6253\u5f00，\u4e4b\u540e\u5728\u67d0\u5904\u8bb0\u5f97\u5173\u95ed\u201d\u3002<\/p>\n

                                            \u4e8c\u5341\u3001\u7248\u672c\u6f14\u8fdb\u4e0e\u8d44\u6599\u517c\u5bb9\u6027<\/h3>\n\nJava \u7248\u672cJEP\u72b6\u6001\u4e0e\u4e3b\u8981\u53d8\u5316<\/tr>\n\n\n\n\n\n\n\n
                                            Java 20<\/td>\nJEP 429<\/td>\n\u5b75\u5316 API，\u65e9\u671f\u5305\u540d\u548c\u4f7f\u7528\u65b9\u5f0f\u4e0e\u5f53\u524d\u4e0d\u540c<\/td>\n<\/tr>\n
                                            Java 21<\/td>\nJEP 446<\/td>\n\u9996\u6b21\u9884\u89c8，\u8fdb\u5165\u6807\u51c6\u9884\u89c8 API \u4f53\u7cfb<\/td>\n<\/tr>\n
                                            Java 22<\/td>\nJEP 464<\/td>\n\u7b2c\u4e8c\u6b21\u9884\u89c8，API \u65e0\u53d8\u5316<\/td>\n<\/tr>\n
                                            Java 23<\/td>\nJEP 481<\/td>\n\u7b2c\u4e09\u6b21\u9884\u89c8；\u8c03\u6574 callWhere \u7684\u64cd\u4f5c\u7c7b\u578b\u4ee5\u652f\u6301\u53d7\u68c0\u5f02\u5e38\u63a8\u65ad，\u79fb\u9664 getWhere<\/td>\n<\/tr>\n
                                            Java 24<\/td>\nJEP 487<\/td>\n\u7b2c\u56db\u6b21\u9884\u89c8；\u79fb\u9664 runWhere\u3001callWhere，\u7edf\u4e00\u4e3a Carrier \u7684\u6d41\u5f0f run\/call<\/td>\n<\/tr>\n
                                            Java 25<\/td>\nJEP 506<\/td>\n\u6b63\u5f0f\u53d1\u5e03；orElse \u4e0d\u518d\u63a5\u53d7 null<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                                            \u56e0\u6b64，\u9605\u8bfb\u65e7\u6587\u7ae0\u65f6\u81f3\u5c11\u8981\u68c0\u67e5\u4e09\u70b9：<\/p>\n

                                          • \u793a\u4f8b\u662f\u5426\u8fd8\u4f7f\u7528\u5b75\u5316\u5668\u5305\u540d；<\/li>\n
                                          • \u662f\u5426\u4f7f\u7528\u5df2\u7ecf\u79fb\u9664\u7684 runWhere \/ callWhere \/ getWhere；<\/li>\n
                                          • \u662f\u5426\u628a\u65e7\u7248 Structured Concurrency \u6784\u9020\u5668\u5199\u6cd5\u4e0e Java 25 \u793a\u4f8b\u6df7\u5728\u4e00\u8d77\u3002<\/li>\n

                                            Java 25 \u7684 StructuredTaskScope \u5df2\u91c7\u7528 StructuredTaskScope.open() \u7b49\u5de5\u5382\u65b9\u5f0f，\u800c\u4e14\u5b83\u4ecd\u662f\u9884\u89c8 API\u3002\u4e0d\u8981\u628a\u65e7\u7248 new StructuredTaskScope.ShutdownOnFailure() \u793a\u4f8b\u76f4\u63a5\u5f53\u4f5c Java 25 \u6700\u7ec8\u5199\u6cd5\u3002<\/p>\n

                                            \u4e8c\u5341\u4e00\u3001\u751f\u4ea7\u843d\u5730\u68c0\u67e5\u6e05\u5355<\/h3>\n

                                            API \u4e0e\u7248\u672c<\/h4>\n
                                              \n
                                            • \u4f7f\u7528 JDK 25 \u7f16\u8bd1\u548c\u8fd0\u884c\u6838\u5fc3 Scoped Value \u4ee3\u7801\u3002<\/li>\n
                                            • \u6838\u5fc3\u4ee3\u7801\u53ea\u4f7f\u7528 where(…).run\/call，\u6ca1\u6709\u590d\u5236\u65e7\u7248\u9759\u6001\u4fbf\u6377\u65b9\u6cd5\u3002<\/li>\n
                                            • \u6d89\u53ca StructuredTaskScope \u65f6，\u660e\u786e\u6807\u6ce8\u5e76\u542f\u7528 Java 25 \u9884\u89c8\u3002<\/li>\n
                                            • \u6ca1\u6709\u628a\u9884\u89c8 API \u7684\u72b6\u6001\u8bef\u5199\u6210\u6b63\u5f0f\u7279\u6027\u3002<\/li>\n<\/ul>\n

                                              \u6570\u636e\u8bbe\u8ba1<\/h4>\n
                                                \n
                                              • \u4e0a\u4e0b\u6587\u5bf9\u8c61\u771f\u6b63\u4e0d\u53ef\u53d8，\u5305\u62ec\u5185\u90e8\u96c6\u5408\u548c\u5f15\u7528\u5bf9\u8c61\u3002<\/li>\n
                                              • \u6ca1\u6709\u628a\u8fde\u63a5\u3001\u6d41\u3001\u9501\u6216\u6574\u4e2a HTTP Request \u585e\u8fdb\u4e0a\u4e0b\u6587\u3002<\/li>\n
                                              • \u591a\u4e2a\u5171\u540c\u51fa\u73b0\u7684\u5b57\u6bb5\u5df2\u5408\u7406\u805a\u5408，\u6ca1\u6709\u521b\u5efa\u5927\u91cf\u788e\u7247\u952e\u3002<\/li>\n
                                              • \u53ef\u7a7a\u5b57\u6bb5\u4e0e\u201c\u672a\u7ed1\u5b9a\u201d\u5177\u6709\u660e\u786e\u3001\u4e0d\u540c\u7684\u8bed\u4e49\u3002<\/li>\n<\/ul>\n

                                                \u5c01\u88c5\u4e0e\u5b89\u5168<\/h4>\n
                                                  \n
                                                • ScopedValue \u952e\u5c3d\u91cf\u79c1\u6709，\u4e0d\u968f API \u8fd4\u56de\u503c\u6cc4\u9732\u3002<\/li>\n
                                                • \u7528\u6237\u548c\u79df\u6237\u4fe1\u606f\u6765\u81ea\u53ef\u4fe1\u8ba4\u8bc1\u4e0e\u6388\u6743\u6d41\u7a0b\u3002<\/li>\n
                                                • \u7f3a\u5c11\u5fc5\u9700\u4e0a\u4e0b\u6587\u65f6\u5feb\u901f\u5931\u8d25，\u4e0d\u4f7f\u7528\u5371\u9669\u9ed8\u8ba4\u503c\u3002<\/li>\n
                                                • \u5916\u90e8 trace ID \u7ecf\u8fc7\u957f\u5ea6\u548c\u5b57\u7b26\u6821\u9a8c，\u907f\u514d\u65e5\u5fd7\u6ce8\u5165\u3002<\/li>\n<\/ul>\n

                                                  \u751f\u547d\u5468\u671f\u4e0e\u5e76\u53d1<\/h4>\n
                                                    \n
                                                  • \u6bcf\u4e2a\u5165\u53e3\u90fd\u6709\u660e\u786e\u7684 run\/call \u8fb9\u754c\u3002<\/li>\n
                                                  • \u666e\u901a\u7ebf\u7a0b\u3001\u865a\u62df\u7ebf\u7a0b\u548c\u7ebf\u7a0b\u6c60\u6ca1\u6709\u88ab\u8bef\u8ba4\u4e3a\u4f1a\u81ea\u52a8\u7ee7\u627f\u3002<\/li>\n
                                                  • StructuredTaskScope \u5728\u7ed1\u5b9a\u4e4b\u540e\u6253\u5f00\u3002<\/li>\n
                                                  • \u65e7\u7ebf\u7a0b\u6c60\u4efb\u52a1\u5728\u63d0\u4ea4\u7ebf\u7a0b\u6355\u83b7\u4e0a\u4e0b\u6587，\u5e76\u5728\u5de5\u4f5c\u7ebf\u7a0b\u91cd\u7ed1\u5b9a\u3002<\/li>\n
                                                  • @Async\u3001Reactor\u3001\u56de\u8c03\u3001\u6d88\u606f\u961f\u5217\u7b49\u8fb9\u754c\u6709\u5355\u72ec\u65b9\u6848\u3002<\/li>\n
                                                  • \u5b50\u4efb\u52a1\u6709\u8d85\u65f6\u3001\u53d6\u6d88\u548c\u54cd\u5e94\u4e2d\u65ad\u8bbe\u8ba1\u3002<\/li>\n<\/ul>\n

                                                    \u6846\u67b6\u4e0e\u65e5\u5fd7<\/h4>\n
                                                      \n
                                                    • \u6ca1\u6709\u5047\u8bbe Scoped Value \u81ea\u52a8\u66ff\u4ee3 SecurityContext\u3002<\/li>\n
                                                    • MDC \u662f\u5426\u9700\u8981\u6865\u63a5\u5df2\u7ecf\u6839\u636e\u771f\u5b9e\u65e5\u5fd7\u94fe\u8def\u786e\u8ba4\u3002<\/li>\n
                                                    • \u5b50\u4efb\u52a1\u4e2d\u7684 MDC \u4f20\u64ad\u5355\u72ec\u9a8c\u8bc1\u3002<\/li>\n
                                                    • \u5f02\u6b65 dispatch \u548c\u5f02\u6b65\u4efb\u52a1\u4e0d\u4f1a\u610f\u5916\u8bfb\u53d6\u533f\u540d\u6216\u9ed8\u8ba4\u4e0a\u4e0b\u6587\u3002<\/li>\n<\/ul>\n

                                                      \u6d4b\u8bd5\u4e0e\u6027\u80fd<\/h4>\n
                                                        \n
                                                      • \u6d4b\u8bd5\u8986\u76d6\u6b63\u5e38\u7ed3\u675f\u3001\u5f02\u5e38\u7ed3\u675f\u3001\u5d4c\u5957\u6062\u590d\u548c\u672a\u7ed1\u5b9a\u8bfb\u53d6\u3002<\/li>\n
                                                      • \u8986\u76d6\u591a\u7528\u6237\u5e76\u53d1\u3001\u7ebf\u7a0b\u6c60\u590d\u7528\u548c\u5b50\u4efb\u52a1\u7ee7\u627f\u3002<\/li>\n
                                                      • \u8fc1\u79fb\u524d\u540e\u6bd4\u8f83\u541e\u5410\u3001\u5c3e\u5ef6\u8fdf\u3001\u5185\u5b58\u548c GC\u3002<\/li>\n
                                                      • \u6ca1\u6709\u7528\u5c11\u91cf\u975e\u6b63\u5f0f\u8ba1\u65f6\u5f97\u51fa\u201c\u6027\u80fd\u63d0\u5347\u591a\u5c11\u500d\u201d\u7684\u7ed3\u8bba\u3002<\/li>\n
                                                      • \u6ca1\u6709\u672a\u7ecf\u6d4b\u91cf\u5c31\u8c03\u6574 Scoped Value \u5185\u90e8\u7f13\u5b58\u53c2\u6570\u3002<\/li>\n<\/ul>\n

                                                        \u4e8c\u5341\u4e8c\u3001\u603b\u7ed3<\/h3>\n

                                                        Scoped Values \u6700\u6709\u4ef7\u503c\u7684\u5730\u65b9，\u4e0d\u662f\u5c11\u5199\u4e86\u4e00\u4e2a remove()，\u4e5f\u4e0d\u662f\u7b80\u5355\u7684\u6027\u80fd\u4f18\u5316，\u800c\u662f\u628a\u4e0a\u4e0b\u6587\u4f20\u9012\u53d8\u6210\u4e86\u4ee3\u7801\u7ed3\u6784\u4e2d\u53ef\u89c1\u7684\u4e8b\u5b9e：<\/p>\n

                                                        ScopedValue<\/span>.<\/span>where<\/span>(<\/span>CONTEXT<\/span>,<\/span> context)<\/span>.<\/span>run<\/span>(<\/span>(<\/span>)<\/span> -><\/span> {<\/span>
                                                        \n \/\/ \u5728\u8fd9\u6bb5\u6267\u884c\u8fc7\u7a0b\u4e2d，\u4e0b\u6e38\u53ef\u4ee5\u8bfb\u53d6 context<\/span>
                                                        \n}<\/span>)<\/span>;<\/span><\/p>\n

                                                        \u5b83\u7528\u4e09\u9879\u7ea6\u675f\u6362\u6765\u4e86\u66f4\u6e05\u6670\u7684\u6570\u636e\u6d41：<\/p>\n

                                                      • \u5355\u5411\u4f20\u9012：\u8c03\u7528\u8005\u5411\u76f4\u63a5\u3001\u95f4\u63a5\u88ab\u8c03\u7528\u8005\u5171\u4eab；<\/li>\n
                                                      • \u6709\u754c\u751f\u547d\u5468\u671f：\u64cd\u4f5c\u7ed3\u675f\u540e\u81ea\u52a8\u89e3\u9664\u6216\u6062\u590d；<\/li>\n
                                                      • \u7ed3\u6784\u5316\u7ee7\u627f：\u53ea\u5728\u80fd\u591f\u4fdd\u8bc1\u5b50\u4efb\u52a1\u751f\u547d\u5468\u671f\u7684\u7ed3\u6784\u4e2d\u8de8\u7ebf\u7a0b\u5171\u4eab\u3002<\/li>\n

                                                        \u56e0\u6b64，\u6700\u5408\u7406\u7684\u8fc1\u79fb\u53e3\u53f7\u4e0d\u662f\u201c\u7528 Scoped Value \u6d88\u706d ThreadLocal\u201d，\u800c\u662f：<\/p>\n

                                                        \u663e\u5f0f\u4e1a\u52a1\u6570\u636e\u4f18\u5148\u7528\u53c2\u6570；\u53ea\u8bfb\u6a2a\u5207\u4e0a\u4e0b\u6587\u4f18\u5148\u8003\u8651 Scoped Value；\u6bcf\u7ebf\u7a0b\u53ef\u53d8\u7f13\u5b58\u7ee7\u7eed\u9009\u62e9\u5408\u9002\u5de5\u5177；\u5f02\u6b65\u4f20\u64ad\u5c0a\u91cd\u5177\u4f53\u6267\u884c\u6a21\u578b\u3002<\/p>\n

                                                        \u5f53\u8bf7\u6c42\u94fe\u8def\u3001\u865a\u62df\u7ebf\u7a0b\u548c\u7ed3\u6784\u5316\u5e76\u53d1\u7ec4\u5408\u4f7f\u7528\u65f6，Scoped Value \u80fd\u8ba9\u201c\u8fd9\u4e2a\u4e0a\u4e0b\u6587\u4ece\u54ea\u91cc\u6765\u3001\u8c01\u80fd\u770b\u5230\u3001\u4ec0\u4e48\u65f6\u5019\u5931\u6548\u201d\u53d8\u5f97\u524d\u6240\u672a\u6709\u7684\u6e05\u695a\u3002\u8fd9\u624d\u662f\u5b83\u5728\u73b0\u4ee3 Java \u5de5\u7a0b\u4e2d\u7684\u6838\u5fc3\u4ef7\u503c\u3002<\/p>\n

                                                        \n

                                                        \u8d44\u6599\u8bf4\u660e：\u672c\u6587\u4f9d\u636e OpenJDK \u7684 JEP 429\u3001446\u3001464\u3001481\u3001487\u3001505\u3001506，\u4ee5\u53ca Java SE 25 \u7684 ScopedValue\u3001ScopedValue.Carrier\u3001ScopedValue.CallableOp\u3001StructuredTaskScope \u5b98\u65b9 API \u6587\u6863\u6574\u7406\u3002\u8d44\u6599\u6838\u5bf9\u65e5\u671f：2026-11-02\u3002\u6587\u4e2d\u4e0d\u5305\u542b\u5916\u90e8\u94fe\u63a5；\u793a\u4f8b\u91cd\u70b9\u5c55\u793a Java 25 API \u548c\u5de5\u7a0b\u8fb9\u754c，\u5177\u4f53\u6846\u67b6\u7248\u672c\u4ecd\u5e94\u7ed3\u5408\u9879\u76ee\u5b9e\u9645\u517c\u5bb9\u6027\u9a8c\u8bc1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

                                                        Scoped Values \u5b9e\u6218：Java 25 \u5982\u4f55\u66ff\u4ee3 ThreadLocal \u4f20\u9012\u8bf7\u6c42\u4e0a\u4e0b\u6587
                                                        \n\u5728\u4e00\u4e2a Web \u8bf7\u6c42\u4e2d，\u94fe\u8def\u8ffd\u8e2a ID\u3001\u5f53\u524d\u7528\u6237\u3001\u79df\u6237\u4fe1\u606f\u7b49\u4e0a\u4e0b\u6587，\u7ecf\u5e38\u9700\u8981\u7a7f\u8fc7\u591a\u5c42\u65b9\u6cd5，\u6700\u7ec8\u5230\u8fbe\u65e5\u5fd7\u3001\u6570\u636e\u8bbf\u95ee\u6216\u8fdc\u7a0b\u8c03\u7528\u7ec4\u4ef6\u3002
                                                        \n\u5982\u679c\u6bcf\u4e00\u5c42\u90fd\u663e\u5f0f\u589e\u52a0\u53c2\u6570，\u65b9\u6cd5\u7b7e\u540d\u4f1a\u8fc5\u901f\u88ab\u8fd9\u4e9b\u201c\u65c1\u89c2\u8005\u53c2\u6570\u201d\u5360\u9886；\u5982\u679c\u4f7f\u7528 ThreadLocal，\u53c8\u8981\u9762\u5bf9\u7ebf\u7a0b\u6c60\u6c61\u67d3\u3001\u5fd8\u8bb0\u6e05\u7406\u3001\u5d4c\u5957\u8986\u76d6\u548c\u8de8\u7ebf\u7a0b\u4f20\u9012\u7b49<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,81,100],"topic":[],"class_list":["post-122263","post","type-post","status-publish","format-standard","hentry","category-server","tag-java","tag-python","tag-100"],"yoast_head":"\nScoped Values \u5b9e\u6218\uff1aJava 25 \u5982\u4f55\u66ff\u4ee3 ThreadLocal \u4f20\u9012\u8bf7\u6c42\u4e0a\u4e0b\u6587 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/122263.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Scoped Values \u5b9e\u6218\uff1aJava 25 \u5982\u4f55\u66ff\u4ee3 ThreadLocal \u4f20\u9012\u8bf7\u6c42\u4e0a\u4e0b\u6587 - 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