{"id":108632,"date":"2026-09-22T09:32:57","date_gmt":"2026-09-22T01:32:57","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/108632.html"},"modified":"2026-09-22T09:32:57","modified_gmt":"2026-09-22T01:32:57","slug":"netty-pipeline-%e4%b8%8e-handler-%e4%bd%93%e7%b3%bb%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/108632.html","title":{"rendered":"Netty Pipeline \u4e0e Handler \u4f53\u7cfb\u8be6\u89e3"},"content":{"rendered":"

Netty Pipeline \u4e0e Handler \u4f53\u7cfb\u8be6\u89e3<\/h2>\n

\u5b9a\u4f4d：Netty \u76ee\u5f55\u7b2c 03 \u7bc7，Pipeline \u7ed3\u6784\u3001Handler \u4e0e Context\u3001\u4e8b\u4ef6\u4f20\u64ad\u673a\u5236\u4e0e\u7f16\u89e3\u7801\u63a5\u5165\u5168\u89e3 \u9002\u7528\u7248\u672c：Netty 4.1.x（JDK 8+）<\/p>\n

\n

\u76ee\u5f55<\/h3>\n
  • ChannelPipeline<\/li>\n
  • ChannelHandler \u4e0e Context<\/li>\n
  • \u4e8b\u4ef6\u4f20\u64ad\u673a\u5236<\/li>\n
  • SimpleChannelInboundHandler<\/li>\n
  • \u7f16\u89e3\u7801\u5668\u63a5\u5165\u4f4d\u7f6e<\/li>\n
  • \u603b\u7ed3<\/li>\n
  • \u5e38\u89c1\u9ad8\u9891\u9762\u8bd5\u9898<\/li>\n
    \n

    \u4e00\u3001ChannelPipeline<\/h3>\n

    1.1 \u7ed3\u6784：\u4e00\u6761\u8fde\u63a5\u7684\u52a0\u5de5\u6d41\u6c34\u7ebf<\/h4>\n

    Channel \u521b\u5efa\u65f6\u540c\u6b65\u521b\u5efa\u4e00\u6761 Pipeline：<\/p>\n

    Head \u21c4 [ContextA(\u89e3\u7801\u5668)] \u21c4 [ContextB(\u4e1a\u52a1)] \u21c4 [ContextC(\u7f16\u7801\u5668)] \u21c4 Tail
    \n \u2502 \u2502
    \n \u5165\u7ad9\u4e8b\u4ef6：Head \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25ba Tail
    \n \u51fa\u7ad9\u4e8b\u4ef6：Head \u25c4\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 Tail<\/p>\n

    \u8981\u70b9：<\/p>\n

      \n
    • Pipeline \u4e0e Channel 1:1，\u672c\u8d28\u662f ChannelHandlerContext \u7ec4\u6210\u7684\u53cc\u5411\u94fe\u8868；<\/li>\n
    • \u94fe\u8868\u8282\u70b9\u4e0d\u662f Handler \u672c\u8eab，\u800c\u662f Context（Handler \u7684\u5305\u88c5，\u6301\u524d\u540e\u6307\u9488）；<\/li>\n
    • Head \u4e0e Tail \u662f\u5185\u7f6e\u7aef\u70b9：Head \u662f\u51fa\u7ad9\u64cd\u4f5c\u7684\u6700\u7ec8\u6267\u884c\u70b9（\u771f\u6b63\u8c03\u5e95\u5c42\u5199），\u4e5f\u662f\u5165\u7ad9\u7684\u8d77\u70b9；Tail \u662f\u5165\u7ad9\u7684\u7ec8\u70b9（\u515c\u5e95\u65e5\u5fd7）\u4e0e\u51fa\u7ad9\u7684\u8d77\u70b9\u3002<\/li>\n<\/ul>\n

      1.2 \u65b9\u5411\u6027：\u4e00\u6761\u94fe\u8dd1\u4e24\u4e2a\u65b9\u5411<\/h4>\n

      Handler \u6309\u5904\u7406\u7684\u65b9\u5411\u5206\u7c7b，\u4e8b\u4ef6\u6309\u65b9\u5411\u6d41\u52a8：<\/p>\n

      \u5165\u7ad9（Inbound）：Head \u2192 Tail \u8bfb\u6570\u636e\u3001\u8fde\u63a5\u6fc0\u6d3b\u3001\u5f02\u5e38\u4e0a\u62a5
      \n\u51fa\u7ad9（Outbound）：Tail \u2192 Head \u5199\u6570\u636e\u3001\u8fde\u63a5\u3001\u5173\u95ed<\/p>\n

      \u4e00\u4e2a\u5165\u7ad9\u4e8b\u4ef6\u7ecf\u8fc7\u51fa\u7ad9 Handler \u65f6\u76f4\u63a5\u8df3\u8fc7（\u53cd\u4e4b\u4ea6\u7136）\u2014\u2014\u6240\u4ee5 addLast \u7684\u987a\u5e8f\u53ea\u51b3\u5b9a\u540c\u65b9\u5411\u5185\u7684\u5148\u540e，\u5165\u7ad9\u4e0e\u51fa\u7ad9\u4e92\u4e0d\u5e72\u6270\u3002\u8fd9\u89e3\u91ca\u4e86\u4e3a\u4ec0\u4e48\u89e3\u7801\u5668（\u5165\u7ad9）\u548c\u7f16\u7801\u5668（\u51fa\u7ad9）\u53ef\u4ee5\u653e\u5728\u76f8\u90bb\u4f4d\u7f6e\u800c\u4e92\u4e0d\u5f71\u54cd\u3002<\/p>\n

      1.3 \u589e\u5220\u64cd\u4f5c\u4e0e\u52a8\u6001\u6027<\/h4>\n

      ChannelPipeline<\/span> p =<\/span> ctx.<\/span>pipeline<\/span>(<\/span>)<\/span>;<\/span>
      \np.<\/span>addLast<\/span>(<\/span>"decoder"<\/span>,<\/span> new<\/span> MsgDecoder<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
      \np.<\/span>addLast<\/span>(<\/span>"handler"<\/span>,<\/span> new<\/span> BizHandler<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
      \np.<\/span>addBefore<\/span>(<\/span>"handler"<\/span>,<\/span> "auth"<\/span>,<\/span> new<\/span> AuthHandler<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
      \np.<\/span>remove<\/span>(<\/span>"auth"<\/span>)<\/span>;<\/span> \/\/ \u63e1\u624b\u5b8c\u6210\u540e\u79fb\u9664<\/span>
      \np.<\/span>replace<\/span>(<\/span>"decoder"<\/span>,<\/span> "decoderV2"<\/span>,<\/span> new<\/span> MsgDecoderV2<\/span>(<\/span>)<\/span>)<\/span>;<\/span> \/\/ \u534f\u8bae\u5347\u7ea7\u70ed\u66ff\u6362<\/span><\/p>\n

      \u751f\u4ea7\u6a21\u5f0f\u2014\u2014\u63e1\u624b\u534f\u5546：<\/p>\n

      \u8fde\u63a5\u5efa\u7acb \u2192 [SSL\/\u9274\u6743\/\u534f\u8bae\u534f\u5546 Handler] \u2192 \u534f\u5546\u6210\u529f \u2192 \u79fb\u9664\u534f\u5546\u6bb5，\u6302\u4e0a\u7a33\u6001\u7f16\u89e3\u7801+\u4e1a\u52a1
      \n \u2192 \u534f\u5546\u5931\u8d25 \u2192 close<\/p>\n

      \u52a8\u6001\u589e\u5220\u5728 EventLoop \u4e0a\u6267\u884c\u662f\u5b89\u5168\u7684（Pipeline \u5185\u90e8\u6709\u540c\u6b65），\u4f46\u4ece\u5916\u90e8\u7ebf\u7a0b\u8c03\u7528\u65f6\u6846\u67b6\u4f1a\u81ea\u52a8\u8c03\u5ea6\u5230 EventLoop\u2014\u2014\u884c\u4e3a\u6b63\u786e，\u4f46\u987a\u5e8f\u8bed\u4e49\u4ee5\u5b9e\u9645\u6267\u884c\u65f6\u523b\u4e3a\u51c6\u3002<\/p>\n

      1.4 fireXxx \u7684\u672c\u8d28<\/h4>\n

      ctx.fireChannelRead(msg) \u7684\u672c\u8d28\u662f：\u4ece\u5f53\u524d Context \u51fa\u53d1，\u6cbf\u4e8b\u4ef6\u65b9\u5411\u627e\u4e0b\u4e00\u4e2a\u5339\u914d\u7c7b\u578b\u7684 Context，\u8c03\u7528\u5b83\u3002\u627e\u4e0d\u5230\u5339\u914d\u7684（\u6bd4\u5982\u540e\u9762\u6ca1\u6709\u5165\u7ad9 Handler \u4e86），\u4e8b\u4ef6\u5230\u8fbe Tail \u88ab\u4e22\u5f03（\u5165\u7ad9）\u6216\u5230\u8fbe Head \u6267\u884c\u5e95\u5c42\u64cd\u4f5c（\u51fa\u7ad9）\u3002<\/p>\n

      \n

      \u4e8c\u3001ChannelHandler \u4e0e Context<\/h3>\n

      2.1 Handler \u4e09\u5206\u7c7b\u4e0e\u9002\u914d\u5668<\/h4>\n\n\u63a5\u53e3\u5904\u7406\u5178\u578b\u4ee3\u8868<\/tr>\n\n\n\n\n
      ChannelInboundHandler<\/td>\n\u5165\u7ad9：\u751f\u547d\u5468\u671f + \u6570\u636e\u8bfb\u5165<\/td>\n\u4e1a\u52a1\u5904\u7406\u5668\u3001\u89e3\u7801\u5668\u3001IdleStateHandler<\/td>\n<\/tr>\n
      ChannelOutboundHandler<\/td>\n\u51fa\u7ad9：\u5199\/\u8fde\u63a5\/\u5173\u95ed<\/td>\n\u7f16\u7801\u5668<\/td>\n<\/tr>\n
      ChannelDuplexHandler<\/td>\n\u53cc\u5411<\/td>\n\u7f16\u89e3\u7801\u5408\u4e00\u3001\u65e5\u5fd7（LoggingHandler）<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      \u76f4\u63a5\u5b9e\u73b0\u63a5\u53e3\u8981\u5199\u5341\u51e0\u4e2a\u65b9\u6cd5，\u6240\u4ee5\u51e0\u4e4e\u90fd\u7528\u9002\u914d\u5668\u57fa\u7c7b：ChannelInboundHandlerAdapter \/ ChannelOutboundHandlerAdapter \/ ChannelDuplexHandlerAdapter\u2014\u2014\u7a7a\u5b9e\u73b0，\u53ea\u8986\u5199\u5173\u5fc3\u7684\u65b9\u6cd5\u3002<\/p>\n

      2.2 ChannelHandlerContext：Handler \u7684\u8fd0\u884c\u65f6\u8eab\u4efd<\/h4>\n

      Context \u662f Handler \u5728 Pipeline \u4e2d\u7684\u4f4d\u7f6e\u5bf9\u8c61：<\/p>\n

      ctx.<\/span>channel<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u6240\u5c5e Channel<\/span>
      \nctx.<\/span>pipeline<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u6240\u5c5e Pipeline<\/span>
      \nctx.<\/span>executor<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u6240\u5c5e EventLoop<\/span>
      \nctx.<\/span>name<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u8282\u70b9\u540d<\/span>
      \nctx.<\/span>write<\/span>(<\/span>msg)<\/span>;<\/span> \/\/ \u26a0 \u4ece\u672c\u8282\u70b9\u5411 Head \u65b9\u5411\u8d70\u51fa\u7ad9\u94fe<\/span>
      \nctx.<\/span>fireChannelRead<\/span>(<\/span>msg)<\/span>;<\/span> \/\/ \u7ee7\u7eed\u5165\u7ad9\u4f20\u64ad<\/span><\/p>\n

      2.3 ctx.write \u4e0e channel.write \u7684\u5dee\u5f02（\u2b50 \u9ad8\u9891\u8003\u70b9）<\/h4>\n

      Pipeline：Head \u21c4 [\u89e3\u7801] \u21c4 [\u4e1a\u52a1] \u21c4 [\u7f16\u7801\u5668] \u21c4 Tail<\/p>\n

      \u4e1a\u52a1 Handler \u4e2d：
      \n ctx.write(msg) \u2192 \u4ece\u300c\u4e1a\u52a1\u300d\u8282\u70b9\u51fa\u53d1 \u2192 \u53ea\u7ecf\u8fc7\u300c\u7f16\u7801\u5668\u300d\u2192 Head
      \n channel.write(msg) \u2192 \u4ece Tail \u51fa\u53d1 \u2192 \u7ecf\u8fc7\u300c\u7f16\u7801\u5668\u300d\u2192\u300c\u4e1a\u52a1\u300d\u2192\u300c\u89e3\u7801\u300d\u2192 Head
      \n （\u51fa\u7ad9\u53ea\u8d70\u51fa\u7ad9\u578b\u8282\u70b9，\u5165\u7ad9\u8282\u70b9\u8df3\u8fc7，\u4f46\u4ecd\u8981\u904d\u5386）<\/p>\n

      \u7ed3\u8bba：<\/p>\n

        \n
      • \u4e24\u8005\u6700\u7ec8\u90fd\u80fd\u7ecf\u8fc7\u7f16\u7801\u5668（\u53ea\u8981\u7f16\u7801\u5668\u5728\u4e1a\u52a1\u4e4b\u540e\u4e14\u662f\u51fa\u7ad9\u578b），\u4f46 ctx.write \u8def\u5f84\u66f4\u77ed\u3001\u5f00\u9500\u66f4\u5c0f；<\/li>\n
      • \u771f\u6b63\u7684\u9677\u9631\u573a\u666f：\u7f16\u7801\u5668\u52a0\u5728\u4e1a\u52a1\u8282\u70b9\u4e4b\u524d（\u9760\u8fd1 Head），\u6b64\u65f6 ctx.write \u4ece\u4e1a\u52a1\u51fa\u53d1\u5411 Head \u8d70\u4f1a\u7ecf\u8fc7\u7f16\u7801\u5668\u6ca1\u95ee\u9898；\u4f46\u82e5\u7f16\u7801\u5668\u52a0\u5728\u4e1a\u52a1\u4e4b\u540e（\u9760\u8fd1 Tail），ctx.write \u5c31\u7ed5\u8fc7\u4e86\u5b83\u2014\u2014\u5199\u51fa\u7684\u662f\u672a\u7f16\u7801\u5bf9\u8c61\u76f4\u63a5\u62a5\u9519；<\/li>\n
      • \u5b9e\u8df5\u89c4\u5219：\u51fa\u7ad9\u64cd\u4f5c\u7528 ctx.writeAndFlush \u65f6，\u786e\u8ba4\u7f16\u7801\u5668\u5728\u5f53\u524d\u4f4d\u7f6e\u7684\u300c\u5411 Head \u65b9\u5411\u300d；\u62ff\u4e0d\u51c6\u5c31\u7528 channel.writeAndFlush（\u8d70\u5168\u7a0b，\u8bed\u4e49\u6700\u7a33）\u3002<\/li>\n<\/ul>\n

        2.4 @Sharable \u4e0e Handler \u5171\u4eab<\/h4>\n

        \u9ed8\u8ba4\u60c5\u51b5\u4e0b ChannelInitializer \u6bcf\u8fde\u63a5 new \u4e00\u4e2a Handler\u2014\u2014\u6700\u5b89\u5168\u3002\u5171\u4eab\u5355\u4f8b\u7684\u6761\u4ef6\u4e0e\u6807\u6ce8：<\/p>\n

        @ChannelHandler.Sharable<\/span>
        \npublic<\/span> class<\/span> MetricsHandler<\/span> extends<\/span> ChannelDuplexHandler<\/span> {<\/span>
        \n private<\/span> final<\/span> LongAdder<\/span> counter =<\/span> new<\/span> LongAdder<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u81ea\u5e26\u5e76\u53d1\u5b89\u5168<\/span>
        \n \/\/ \u4e0d\u6301\u6709\u4efb\u4f55\u300c\u8fde\u63a5\u7ea7\u300d\u53ef\u53d8\u72b6\u6001<\/span>
        \n}<\/span><\/p>\n

        \u89c4\u5219：<\/p>\n

          \n
        • \u6709\u8fde\u63a5\u7ea7\u72b6\u6001（\u4f1a\u8bdd\u3001\u7d2f\u79ef\u7f13\u51b2\u533a\u3001\u89e3\u7801\u72b6\u6001\u673a）\u7684 Handler \u7edd\u4e0d\u80fd\u5171\u4eab\u2014\u2014\u5178\u578b\u4e8b\u6545：\u7d2f\u79ef\u89e3\u7801\u5668\u88ab\u5171\u4eab，A \u8fde\u63a5\u7684\u534a\u5305\u6570\u636e\u6d41\u8fdb B \u8fde\u63a5；<\/li>\n
        • @Sharable \u53ea\u662f\u58f0\u660e\u300c\u53ef\u4ee5\u5171\u4eab\u300d，\u4e0d\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168，\u5e76\u53d1\u6b63\u786e\u6027\u81ea\u5df1\u8d1f\u8d23；<\/li>\n
        • \u5224\u65ad\u53e3\u8bc0：\u8fd9\u4e2a Handler \u6709\u6ca1\u6709\u5b57\u6bb5\u968f\u8fde\u63a5\u53d8\u5316？\u6709 \u2192 \u6bcf\u8fde\u63a5\u65b0\u5efa\u3002<\/li>\n<\/ul>\n

          2.5 handlerAdded \/ handlerRemoved<\/h4>\n

          @Override<\/span>
          \npublic<\/span> void<\/span> handlerAdded<\/span>(<\/span>ChannelHandlerContext<\/span> ctx)<\/span> {<\/span>
          \n \/\/ \u52a0\u5165 Pipeline：\u521d\u59cb\u5316\u8fde\u63a5\u7ea7\u8d44\u6e90（\u5982\u65b0\u5206\u914d\u7d2f\u79ef\u7f13\u51b2）<\/span>
          \n}<\/span>
          \n@Override<\/span>
          \npublic<\/span> void<\/span> handlerRemoved<\/span>(<\/span>ChannelHandlerContext<\/span> ctx)<\/span> {<\/span>
          \n \/\/ \u79fb\u51fa：\u91ca\u653e\u8d44\u6e90（\u91ca\u653e\u672a\u6d88\u8d39\u7684\u7f13\u51b2\u2014\u2014\u5f15\u7528\u8ba1\u6570，06 \u7bc7）<\/span>
          \n}<\/span><\/p>\n

          \u6bd4 channelActive\/channelInactive \u66f4\u65e9\/\u66f4\u665a\u7684\u751f\u547d\u5468\u671f\u6302\u70b9，\u9002\u5408\u8d44\u6e90\u7684\u7cbe\u786e\u914d\u5bf9\u7ba1\u7406\u3002<\/p>\n

          \n

          \u4e09\u3001\u4e8b\u4ef6\u4f20\u64ad\u673a\u5236<\/h3>\n

          3.1 \u5165\u7ad9\u4e8b\u4ef6\u5168\u666f<\/h4>\n\n\u4e8b\u4ef6\u89e6\u53d1\u65f6\u673a\u5e38\u89c1\u7528\u9014<\/tr>\n\n\n\n\n\n\n\n\n\n
          channelRegistered<\/td>\n\u6ce8\u518c\u5230 EventLoop<\/td>\n\u5c11\u7528<\/td>\n<\/tr>\n
          channelActive<\/td>\n\u8fde\u63a5\u5efa\u7acb<\/td>\n\u63e1\u624b\u3001\u52a0\u5165\u8fde\u63a5\u7ec4<\/td>\n<\/tr>\n
          channelRead<\/td>\n\u8bfb\u5230\u6570\u636e<\/td>\n\u89e3\u7801\u3001\u4e1a\u52a1<\/td>\n<\/tr>\n
          channelReadComplete<\/td>\n\u672c\u8f6e\u8bfb\u5b8c\u6210<\/td>\n\u51b3\u5b9a\u662f\u5426\u7ee7\u7eed\u8bfb\u3001\u6279\u91cf\u5904\u7406<\/td>\n<\/tr>\n
          userEventTriggered<\/td>\n\u81ea\u5b9a\u4e49\u4e8b\u4ef6<\/td>\nIdleStateEvent \u5fc3\u8df3（07 \u7bc7）<\/td>\n<\/tr>\n
          channelWritabilityChanged<\/td>\n\u5199\u6c34\u4f4d\u7ffb\u8f6c<\/td>\n\u80cc\u538b\u63a7\u5236（05 \u7bc7）<\/td>\n<\/tr>\n
          channelInactive<\/td>\n\u65ad\u5f00<\/td>\n\u6e05\u7406<\/td>\n<\/tr>\n
          exceptionCaught<\/td>\n\u94fe\u4e0a\u629b\u5f02\u5e38<\/td>\n\u515c\u5e95<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          3.2 \u4f20\u64ad\u89c4\u5219：\u5904\u7406\u3001\u7ee7\u7eed\u3001\u7ec8\u6b62<\/h4>\n

          @Override<\/span>
          \npublic<\/span> void<\/span> channelRead<\/span>(<\/span>ChannelHandlerContext<\/span> ctx,<\/span> Object<\/span> msg)<\/span> {<\/span>
          \n \/\/ \u4e09\u79cd\u9009\u62e9：<\/span>
          \n \/\/ \u2460 \u5904\u7406\u5e76\u7ee7\u7eed：\u5904\u7406\u540e ctx.fireChannelRead(msg);<\/span>
          \n \/\/ \u2461 \u5904\u7406\u5e76\u7ec8\u6b62（\u6d88\u8d39）：\u5904\u7406\u540e\u4e0d\u518d\u4f20\u64ad（\u6ce8\u610f\u91ca\u653e，\u89c1 3.4）<\/span>
          \n \/\/ \u2462 \u8df3\u8fc7：\u76f4\u63a5 ctx.fireChannelRead(msg);<\/span>
          \n}<\/span><\/p>\n

          \u4e0d\u8c03\u7528 fireXxx \u5c31\u662f\u62e6\u622a\/\u6d88\u8d39\u2014\u2014\u8d23\u4efb\u94fe\u7684\u5f00\u5173\u5c31\u5728\u4f60\u624b\u91cc\u3002\u51fa\u7ad9\u65b9\u5411\u540c\u7406：write \u4e8b\u4ef6\u7ecf\u8fc7\u51fa\u7ad9 Handler，\u53ef\u6539\u5199\u6d88\u606f\u3001\u7edf\u8ba1\u3001\u9650\u6d41，\u7136\u540e\u8c03 ctx.write \u7ee7\u7eed（\u4e0d\u7ee7\u7eed = \u6d88\u606f\u88ab\u541e，\u8fd9\u662f\u300c\u5199\u62e6\u622a\u5668\u4e22\u5931\u6d88\u606f\u300d\u7684\u5e38\u89c1\u539f\u56e0）\u3002<\/p>\n

          3.3 \u5f02\u5e38\u4f20\u64ad<\/h4>\n

          \u5f02\u5e38\u6cbf\u5165\u7ad9\u65b9\u5411\u5411\u540e\u4f20\u64ad：<\/p>\n

          \u89e3\u7801\u5668\u629b\u5f02\u5e38 \u2192 \u89e3\u7801\u5668\u4e4b\u540e\u7684\u5165\u7ad9 Handler \u7684 exceptionCaught
          \n \u2192 \u4e00\u8def\u5411\u540e，\u76f4\u5230\u67d0\u4e2a Handler \u5904\u7406
          \n \u2192 \u65e0\u4eba\u5904\u7406：Tail \u6253\u5370\u544a\u8b66\u65e5\u5fd7（\u8fde\u63a5\u4e0d\u4f1a\u81ea\u52a8\u5173\u95ed）<\/p>\n

          \u751f\u4ea7\u60ef\u4f8b：<\/p>\n

        • \u5c3e\u90e8\u515c\u5e95：\u94fe\u8def\u6700\u540e\u4e00\u4e2a\u5165\u7ad9 Handler \u5b9e\u73b0 exceptionCaught：\u8bb0\u65e5\u5fd7 + \u5173\u95ed\u8fde\u63a5（\u9632\u810f\u8fde\u63a5）；<\/li>\n
        • \u5c31\u8fd1\u5904\u7406：\u4e1a\u52a1\u8bed\u4e49\u660e\u786e\u7684\u5f02\u5e38（\u89e3\u7801\u5931\u8d25\u3001\u9274\u6743\u5931\u8d25）\u5728\u5bf9\u5e94 Handler \u5185\u76f4\u63a5\u5904\u7406（\u56de\u9519\u8bef\u5305 + close），\u4e0d\u4f9d\u8d56\u515c\u5e95；<\/li>\n
        • \u4e0d\u8981\u628a exceptionCaught \u5f53\u4e1a\u52a1\u56de\u8c03\u7528\u2014\u2014\u5b83\u53ea\u8be5\u51fa\u73b0\u5728\u5f02\u5e38\u5904\u7406\u4e0a\u3002<\/li>\n

          3.4 \u6d88\u606f\u5bf9\u8c61\u7684\u6240\u6709\u6743\u6d41\u8f6c（\u5f15\u7528\u8ba1\u6570\u4f0f\u7b14）<\/h4>\n

          channelRead(ctx, msg) \u62ff\u5230\u7684 msg（\u901a\u5e38\u662f ByteBuf）\u5e26\u7740\u6240\u6709\u6743：<\/p>\n

          \u89c4\u5219：\u8c01\u6700\u540e\u6301\u6709，\u8c01\u8d1f\u8d23\u5904\u7406
          \n – \u7ee7\u7eed\u4f20\u64ad：\u6240\u6709\u6743\u4ea4\u7ed9\u4e0b\u6e38（\u4e0d\u8981 release）
          \n – \u6d88\u8d39\u6389：\u5fc5\u987b release（04\/06 \u7bc7\u5f15\u7528\u8ba1\u6570）
          \n – \u5199\u51fa：\u6240\u6709\u6743\u4ea4\u7ed9\u5199\u6d41\u7a0b（\u5199\u6210\u529f\/\u5931\u8d25\u7531\u6846\u67b6\u91ca\u653e）<\/p>\n

          \u8fdd\u53cd\u5373\u5806\u5916\u5185\u5b58\u6cc4\u6f0f\u2014\u2014\u8fd9\u662f Netty \u6700\u5e38\u89c1\u7684\u8d44\u6e90\u4e8b\u6545，06 \u7bc7\u4f1a\u7cfb\u7edf\u5c55\u5f00\u6cc4\u6f0f\u68c0\u6d4b\u4e0e\u6392\u67e5\u3002<\/p>\n

          \n

          \u56db\u3001SimpleChannelInboundHandler<\/h3>\n

          4.1 \u80fd\u529b\u4e0e\u6a21\u677f<\/h4>\n

          public<\/span> class<\/span> BizHandler<\/span> extends<\/span> SimpleChannelInboundHandler<\/span><<\/span>OrderMessage<\/span>><\/span><\/span> {<\/span><\/p>\n

          @Override<\/span>
          \n protected<\/span> void<\/span> channelRead0<\/span>(<\/span>ChannelHandlerContext<\/span> ctx,<\/span> OrderMessage<\/span> msg)<\/span> {<\/span>
          \n \/\/ \u53ea\u63a5\u6536 OrderMessage \u7c7b\u578b；\u65b9\u6cd5\u8fd4\u56de\u540e\u6846\u67b6\u81ea\u52a8 msg.release()<\/span>
          \n process<\/span>(<\/span>ctx,<\/span> msg)<\/span>;<\/span>
          \n }<\/span><\/p>\n

          @Override<\/span>
          \n public<\/span> void<\/span> exceptionCaught<\/span>(<\/span>ChannelHandlerContext<\/span> ctx,<\/span> Throwable<\/span> cause)<\/span> {<\/span>
          \n ctx.<\/span>close<\/span>(<\/span>)<\/span>;<\/span>
          \n }<\/span>
          \n}<\/span><\/p>\n

          \u4e24\u4e2a\u81ea\u52a8\u5316\u80fd\u529b：<\/p>\n

        • \u6cdb\u578b\u8fc7\u6ee4：\u975e OrderMessage \u7c7b\u578b\u7684\u6d88\u606f\u81ea\u52a8\u900f\u4f20\u7ed9\u4e0b\u4e00\u4e2a Handler（\u591a\u7c7b\u578b\u5206\u53d1\u573a\u666f\u53ef\u6302\u591a\u4e2a Simple \u4e32\u8054）；<\/li>\n
        • \u81ea\u52a8\u91ca\u653e：channelRead0 \u8fd4\u56de\u540e ReferenceCountUtil.release(msg)\u2014\u201406 \u7bc7\u5f15\u7528\u8ba1\u6570\u7684\u300c\u6846\u67b6\u5e2e\u4f60\u505a\u300d\u6848\u4f8b\u3002<\/li>\n

          4.2 autoRelease \u53c2\u6570\u4e0e\u9677\u9631<\/h4>\n

          new<\/span> SimpleChannelInboundHandler<\/span><<\/span>Msg<\/span>><\/span><\/span>(<\/span>false<\/span>)<\/span> {<\/span> .<\/span>.<\/span>.<\/span> }<\/span> \/\/ autoRelease = false<\/span><\/p>\n

          \u8bbe\u4e3a false \u7684\u573a\u666f：\u6d88\u606f\u8981\u5f02\u6b65\u6682\u5b58（\u653e\u5165\u961f\u5217\u4ea4\u7ed9\u4e1a\u52a1\u7ebf\u7a0b\u6c60\u7a0d\u540e\u5904\u7406）\u6216\u8981\u7ee7\u7eed\u4f20\u64ad\u3002\u9677\u9631\u7ec4\u5408：<\/p>\n

            \n
          • autoRelease = true（\u9ed8\u8ba4）\u5374\u5728 channelRead0 \u91cc\u628a msg \u5b58\u8d77\u6765\u5f02\u6b65\u7528 \u2192 \u4f7f\u7528\u5df2\u91ca\u653e\u7684\u7f13\u51b2，\u62a5 IllegalReferenceCountException；<\/li>\n
          • \u60f3\u628a\u6d88\u606f fireChannelRead \u7ed9\u4e0b\u6e38，\u5374\u7ee7\u627f Simple \u9ed8\u8ba4\u91ca\u653e \u2192 \u4e0b\u6e38\u62ff\u5230\u5df2\u91ca\u653e\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n

            \u539f\u5219：\u6d88\u606f\u7684\u751f\u547d\u5468\u671f\u5fc5\u987b\u5355\u4e00\u4e14\u660e\u786e\u2014\u2014\u8981\u4e48\u6846\u67b6\u91ca\u653e\u3001\u8981\u4e48\u4f60\u91ca\u653e，\u4e0d\u5141\u8bb8\u53cc\u5934\u6216\u65e0\u4e3b\u3002<\/p>\n

            4.3 \u4e0e Adapter \u7684\u53d6\u820d<\/h4>\n\n\u9700\u6c42\u9009\u62e9<\/tr>\n\n\n\n\n\n
            \u5355\u4e00\u6d88\u606f\u7c7b\u578b，\u6d88\u8d39\u5373\u5f03<\/td>\nSimpleChannelInboundHandler<T><\/td>\n<\/tr>\n
            \u5904\u7406\u539f\u59cb ByteBuf（\u89e3\u7801\u5668\u81ea\u5df1）<\/td>\nByteToMessageDecoder（04 \u7bc7）<\/td>\n<\/tr>\n
            \u591a\u7c7b\u578b\u6d88\u606f\u624b\u52a8\u5206\u53d1<\/td>\nChannelInboundHandlerAdapter<\/td>\n<\/tr>\n
            \u9700\u8981\u63a7\u5236\u91ca\u653e\u65f6\u673a（\u5f02\u6b65\u5904\u7406）<\/td>\nAdapter + \u624b\u52a8\u91ca\u653e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
            \n

            \u4e94\u3001\u7f16\u89e3\u7801\u5668\u63a5\u5165\u4f4d\u7f6e<\/h3>\n

            5.1 \u65b9\u5411\u5f52\u5c5e\u4e0e\u7ecf\u5178\u987a\u5e8f<\/h4>\n

            \u6807\u51c6\u4e1a\u52a1\u94fe（\u670d\u52a1\u7aef）：<\/p>\n

            \u5165\u7ad9\u65b9\u5411 \u2192 [\u5e27\u89e3\u7801\u5668] \u2192 [\u534f\u8bae\u89e3\u7801\u5668] \u2192 [\u9274\u6743] \u2192 [\u4e1a\u52a1]
            \n \u51fa\u7ad9\u65b9\u5411 \u2190 [\u534f\u8bae\u7f16\u7801\u5668] \u2190（\u4e1a\u52a1\u5199\u51fa）<\/p>\n

            Pipeline addLast \u987a\u5e8f：
            \n 1. IdleStateHandler（\u5fc3\u8df3，07 \u7bc7）
            \n 2. LengthFieldBasedFrameDecoder（\u62c6\u5305，04 \u7bc7）
            \n 3. MsgDecoder（\u5b57\u8282 \u2192 \u6d88\u606f\u5bf9\u8c61）
            \n 4. MsgEncoder（\u6d88\u606f\u5bf9\u8c61 \u2192 \u5b57\u8282）
            \n 5. AuthHandler（\u53ef\u52a8\u6001\u79fb\u9664）
            \n 6. BizHandler（\u4e1a\u52a1，\u901a\u5e38\u94fe\u5c3e）<\/p>\n

            \u89c4\u5219\u63d0\u70bc：<\/p>\n

              \n
            • \u89e3\u7801\u5668\u653e\u4e1a\u52a1\u4e4b\u524d（\u5165\u7ad9\u5148\u89e3\u7801）；<\/li>\n
            • \u7f16\u7801\u5668\u4e0e\u4e1a\u52a1\u7684\u76f8\u5bf9\u4f4d\u7f6e\u51b3\u5b9a ctx.write \u662f\u5426\u7ecf\u8fc7\u5b83（2.3 \u8282）\u2014\u2014\u4fdd\u5b88\u505a\u6cd5\u662f\u7f16\u7801\u5668\u7d27\u90bb\u4e1a\u52a1\u4e4b\u524d，\u4e1a\u52a1\u5185\u7528 ctx.writeAndFlush；<\/li>\n
            • \u5fc3\u8df3\u4e0e\u7a7a\u95f2\u68c0\u6d4b\u653e\u6700\u524d，\u4fdd\u8bc1\u4efb\u4f55\u60c5\u51b5\u4e0b\u90fd\u80fd\u611f\u77e5\u8fde\u63a5\u6b7b\u6d3b\u3002<\/li>\n<\/ul>\n

              5.2 \u7ec4\u5408\u4e0e\u52a8\u6001\u6a21\u5f0f<\/h4>\n
                \n
              • CombinedChannelDuplexHandler：\u628a\u914d\u5bf9\u7684\u7f16\/\u89e3\u7801\u5668\u5408\u6210\u4e00\u4e2a\u8282\u70b9，\u7b80\u5316\u94fe\u7ba1\u7406；<\/li>\n
              • MessageToMessageCodec<IN, OUT>：\u6d88\u606f\u5230\u6d88\u606f\u7684\u53cc\u5411\u8f6c\u6362（\u5982\u5185\u90e8\u534f\u8bae\u5bf9\u8c61 \u2194 \u5916\u90e8\u534f\u8bae\u5bf9\u8c61）；<\/li>\n
              • \u534f\u5546\u540e\u66ff\u6362：\u63e1\u624b\u671f\u94fe = [\u957f\u5ea6\u89e3\u7801 + \u63e1\u624b\u6d88\u606f\u7f16\u89e3\u7801 + \u534f\u5546 Handler]；\u534f\u5546\u5b8c\u6210 \u2192 pipeline.remove(\u534f\u5546) + pipeline.addLast(\u7a33\u6001\u7f16\u89e3\u7801)\u2014\u2014\u8fd0\u884c\u65f6\u70ed\u5207\u6362，\u8fde\u63a5\u4e0d\u65ad\u3002<\/li>\n<\/ul>\n

                5.3 \u5e38\u89c1\u9519\u8bef\u6e05\u5355<\/h4>\n\n\u9519\u8bef\u540e\u679c<\/tr>\n\n\n\n\n\n
                \u89e3\u7801\u5668\u52a0\u5728\u4e1a\u52a1\u4e4b\u540e<\/td>\n\u4e1a\u52a1\u62ff\u5230\u539f\u59cb\u5b57\u8282，ClassCastException<\/td>\n<\/tr>\n
                \u7f16\u7801\u5668\u4f4d\u7f6e\u88ab ctx.write \u7ed5\u8fc7<\/td>\n\u672a\u7f16\u7801\u5bf9\u8c61\u76f4\u8fbe\u5e95\u5c42，UnsupportedMessageTypeException<\/td>\n<\/tr>\n
                \u5e27\u89e3\u7801\u5668 maxFrameLength \u8fc7\u5c0f<\/td>\n\u5927\u6d88\u606f\u88ab\u622a\u65ad\u629b TooLongFrameException，\u8fde\u63a5\u88ab\u5173<\/td>\n<\/tr>\n
                \u591a\u4e2a\u89e3\u7801\u5668\u987a\u5e8f\u98a0\u5012（\u5148\u4e1a\u52a1\u89e3\u7801\u540e\u62c6\u5305）<\/td>\n\u534a\u5305\u76f4\u63a5\u8fdb\u4e1a\u52a1\u89e3\u7801，\u89e3\u7801\u5931\u8d25<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
                \n

                \u516d\u3001\u603b\u7ed3<\/h3>\n
              • Pipeline \u662f\u4e0e Channel 1:1 \u7684\u53cc\u5411\u94fe\u8868，\u8282\u70b9\u662f Context；Head\/Tail \u5185\u7f6e\u7aef\u70b9；\u5165\u7ad9\u4ece Head \u5230 Tail，\u51fa\u7ad9\u53cd\u5411，\u8de8\u65b9\u5411\u8282\u70b9\u4e92\u4e0d\u5e72\u6270\u3002<\/li>\n
              • Context \u662f Handler \u7684\u4f4d\u7f6e\u5bf9\u8c61：ctx.write \u4ece\u5f53\u524d\u8282\u70b9\u5411 Head \u8d70\u3001channel.write \u4ece Tail \u8d70\u5168\u7a0b\u2014\u2014\u7f16\u7801\u5668\u4f4d\u7f6e\u4e0e\u5199\u51fa\u65b9\u5f0f\u5fc5\u987b\u5339\u914d，\u62ff\u4e0d\u51c6\u7528 channel.writeAndFlush\u3002<\/li>\n
              • @Sharable \u53ea\u58f0\u660e\u53ef\u5171\u4eab，\u4e0d\u4fdd\u8bc1\u5b89\u5168；\u6709\u8fde\u63a5\u7ea7\u72b6\u6001\u7684 Handler \u5fc5\u987b\u6bcf\u8fde\u63a5\u65b0\u5efa；\u5171\u4eab\u7684\u5224\u65ad\u6807\u51c6\u662f\u300c\u6709\u65e0\u968f\u8fde\u63a5\u53d8\u5316\u7684\u5b57\u6bb5\u300d\u3002<\/li>\n
              • \u4e8b\u4ef6\u4f20\u64ad = \u8d23\u4efb\u94fe：\u4e0d fireXxx \u5373\u6d88\u8d39\/\u62e6\u622a；\u5f02\u5e38\u6cbf\u5165\u7ad9\u5411\u540e\u4f20\u64ad，\u5c3e\u90e8\u515c\u5e95 + \u5c31\u8fd1\u5904\u7406\u53cc\u4fdd\u9669\u3002<\/li>\n
              • \u6d88\u606f\u6240\u6709\u6743\u7eaa\u5f8b：\u4f20\u64ad\u4ea4\u4e0b\u6e38\u3001\u6d88\u8d39\u8981\u91ca\u653e\u3001\u5199\u51fa\u4ea4\u6846\u67b6\u2014\u2014\u751f\u547d\u5468\u671f\u5355\u4e00\u660e\u786e，\u8fd9\u662f 06 \u7bc7\u5f15\u7528\u8ba1\u6570\u7684\u524d\u7f6e\u8ba4\u77e5\u3002<\/li>\n
              • Simple \u7684\u81ea\u52a8\u5316\u662f\u53cc\u5203\u5251：\u7c7b\u578b\u8fc7\u6ee4 + \u81ea\u52a8\u91ca\u653e\u7701\u5fc3，\u4f46\u5f02\u6b65\u6682\u5b58\/\u7ee7\u7eed\u4f20\u64ad\u5fc5\u987b autoRelease = false\u3002<\/li>\n
              • \u7f16\u89e3\u7801\u63a5\u5165\u987a\u5e8f：\u5fc3\u8df3 \u2192 \u62c6\u5305 \u2192 \u89e3\u7801 \u2192 \u7f16\u7801 \u2192 \u9274\u6743（\u53ef\u52a8\u6001）\u2192 \u4e1a\u52a1；\u534f\u5546\u6bb5\u652f\u6301\u8fd0\u884c\u65f6\u70ed\u66ff\u6362\u3002<\/li>\n
                \n

                \u4e03\u3001\u5e38\u89c1\u9ad8\u9891\u9762\u8bd5\u9898<\/h3>\n

                1. ChannelPipeline \u7684\u7ed3\u6784\u662f\u4ec0\u4e48？\u4e8b\u4ef6\u5982\u4f55\u6d41\u52a8？<\/p>\n

                \u8981\u70b9：\u4e0e Channel 1:1 \u7684\u53cc\u5411\u94fe\u8868，\u8282\u70b9\u662f ChannelHandlerContext（\u5305\u88c5 Handler），\u7aef\u70b9\u4e3a\u5185\u7f6e Head \u4e0e Tail\u3002\u5165\u7ad9\u4e8b\u4ef6（\u8bfb\/\u6fc0\u6d3b）\u4ece Head \u6d41\u5411 Tail，\u51fa\u7ad9\u4e8b\u4ef6（\u5199\/\u5173\u95ed）\u53cd\u5411\u3002Handler \u53ea\u5904\u7406\u81ea\u5df1\u65b9\u5411\u7684\u4e8b\u4ef6\u3002\u6240\u6709\u56de\u8c03\u5728\u6240\u5c5e Channel \u7684 EventLoop \u4e0a\u4e32\u884c\u6267\u884c\u3002<\/p>\n

                2. ChannelHandler \u548c ChannelHandlerContext \u7684\u533a\u522b？<\/p>\n

                \u8981\u70b9：Handler \u662f\u4e1a\u52a1\u903b\u8f91\u8f7d\u4f53（\u65e0\u4f4d\u7f6e\u6982\u5ff5），Context \u662f Handler \u5728 Pipeline \u4e2d\u7684\u5305\u88c5：\u6301\u6709\u94fe\u8868\u524d\u540e\u5f15\u7528\u3001\u63d0\u4f9b channel\/pipeline\/executor \u8bbf\u95ee\u3001\u63d0\u4f9b fire\/write \u7b49\u4f20\u64ad\u5165\u53e3\u3002\u540c\u4e00 Handler \u52a0\u5165\u4e0d\u540c Pipeline \u4f1a\u6709\u4e0d\u540c Context\u3002<\/p>\n

                3. ctx.write \u548c channel.write \u7684\u533a\u522b？\u4ec0\u4e48\u65f6\u5019\u4f1a\u51fa\u95ee\u9898？<\/p>\n

                \u8981\u70b9：ctx.write \u4ece\u5f53\u524d Context \u5411 Head \u65b9\u5411\u8d70\u51fa\u7ad9\u94fe；channel.write \u4ece Tail \u51fa\u53d1\u8d70\u5b8c\u6574\u51fa\u7ad9\u94fe\u3002\u95ee\u9898\u573a\u666f：\u7f16\u7801\u5668\u52a0\u5728\u5f53\u524d\u4e1a\u52a1\u8282\u70b9\u9760 Tail \u4e00\u4fa7\u65f6，ctx.write \u4f1a\u7ed5\u8fc7\u7f16\u7801\u5668\u5bfc\u81f4\u672a\u7f16\u7801\u5bf9\u8c61\u76f4\u8fbe\u5e95\u5c42\u62a5\u9519\u3002\u89c4\u5219：\u786e\u8ba4\u7f16\u7801\u5668\u5728\u5411 Head \u7684\u8def\u5f84\u4e0a，\u5426\u5219\u7528 channel.writeAndFlush\u3002<\/p>\n

                4. @Sharable \u7684\u4f5c\u7528？\u5171\u4eab Handler \u8981\u6ce8\u610f\u4ec0\u4e48？<\/p>\n

                \u8981\u70b9：\u6807\u6ce8\u540e\u540c\u4e00\u5b9e\u4f8b\u53ef\u52a0\u5165\u591a\u6761 Pipeline（\u5355\u4f8b\u590d\u7528）\u3002\u5b83\u53ea\u58f0\u660e\u53ef\u5171\u4eab，\u4e0d\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168：\u5fc5\u987b\u65e0\u8fde\u63a5\u7ea7\u53ef\u53d8\u72b6\u6001，\u5171\u4eab\u72b6\u6001\u8981\u81ea\u5e26\u5e76\u53d1\u63a7\u5236\u3002\u6709\u72b6\u6001（\u89e3\u7801\u7f13\u51b2\u3001\u4f1a\u8bdd）\u7684 Handler \u5171\u4eab\u4f1a\u5bfc\u81f4\u6570\u636e\u4e32\u8fde\u63a5，\u5fc5\u987b\u6bcf\u8fde\u63a5\u65b0\u5efa\u3002<\/p>\n

                5. Netty \u7684\u5f02\u5e38\u662f\u5982\u4f55\u4f20\u64ad\u7684？\u6700\u4f73\u5b9e\u8df5？<\/p>\n

                \u8981\u70b9：\u94fe\u4e0a\u629b\u51fa\u7684\u5f02\u5e38\u6cbf\u5165\u7ad9\u65b9\u5411\u5411\u540e\u4f20\u64ad\u5230\u540e\u7eed Handler \u7684 exceptionCaught；\u65e0\u4eba\u5904\u7406\u65f6 Tail \u6253\u544a\u8b66\u65e5\u5fd7，\u8fde\u63a5\u4e0d\u4f1a\u81ea\u52a8\u5173\u95ed\u3002\u5b9e\u8df5：\u5c3e\u90e8\u653e\u515c\u5e95（\u65e5\u5fd7+\u5173\u95ed），\u4e1a\u52a1\u8bed\u4e49\u660e\u786e\u7684\u5f02\u5e38\u5c31\u8fd1\u5904\u7406（\u56de\u9519\u8bef\u5305+\u5173\u95ed）；\u4e0d\u8981\u4f9d\u8d56\u515c\u5e95\u505a\u4e1a\u52a1\u6062\u590d\u3002<\/p>\n

                6. channelRead \u4e2d\u7684 msg \u5e94\u8be5\u600e\u4e48\u5904\u7406？\u4e0d\u5904\u7406\u4f1a\u600e\u6837？<\/p>\n

                \u8981\u70b9：msg（\u5e38\u4e3a ByteBuf）\u5e26\u6240\u6709\u6743：\u7ee7\u7eed\u4f20\u64ad\u5219\u4ea4\u4e0b\u6e38（\u4e0d\u91ca\u653e）；\u6d88\u8d39\u5219\u5fc5\u987b release（\u5f15\u7528\u8ba1\u6570）；\u5199\u51fa\u5219\u6240\u6709\u6743\u4ea4\u5199\u6d41\u7a0b\u3002\u65e2\u4e0d\u4f20\u64ad\u4e5f\u4e0d\u91ca\u653e\u4f1a\u5bfc\u81f4\u5806\u5916\u5185\u5b58\u6cc4\u6f0f，\u5f00 LeakDetector \u53ef\u68c0\u51fa\u3002SimpleChannelInboundHandler \u9ed8\u8ba4\u5728\u56de\u8c03\u540e\u81ea\u52a8\u91ca\u653e\u3002<\/p>\n

                7. SimpleChannelInboundHandler \u76f8\u6bd4 ChannelInboundHandlerAdapter \u591a\u4e86\u4ec0\u4e48？<\/p>\n

                \u8981\u70b9：\u4e24\u70b9\u2014\u2014\u6309\u6cdb\u578b\u7c7b\u578b\u81ea\u52a8\u8fc7\u6ee4（\u4e0d\u5339\u914d\u7684\u6d88\u606f\u900f\u4f20）；\u56de\u8c03\u8fd4\u56de\u540e\u81ea\u52a8 release \u6d88\u606f（autoRelease \u9ed8\u8ba4 true）\u3002\u6ce8\u610f\u82e5\u6d88\u606f\u8981\u5f02\u6b65\u6682\u5b58\u6216\u7ee7\u7eed\u4f20\u64ad，\u5fc5\u987b\u6784\u9020\u65f6\u8bbe autoRelease=false \u5e76\u81ea\u884c\u7ba1\u7406\u91ca\u653e，\u5426\u5219\u62a5 IllegalReferenceCountException \u6216\u4e0b\u6e38\u62ff\u5230\u5df2\u91ca\u653e\u7f13\u51b2\u3002<\/p>\n

                8. \u4e00\u6761\u6d88\u606f\u4ece\u7f51\u7edc\u5230\u8fbe\u5230\u4e1a\u52a1\u5904\u7406\u7684\u5b8c\u6574\u94fe\u8def？<\/p>\n

                \u8981\u70b9：OP_READ \u5c31\u7eea \u2192 EventLoop \u89e6\u53d1\u8bfb \u2192 ByteBuf \u8bfb\u5165\u5185\u6838\u6570\u636e \u2192 \u5165\u7ad9\u4e8b\u4ef6\u4ece Head \u4f20\u64ad：\u5e27\u89e3\u7801\u5668（\u62c6\u5305）\u2192 \u534f\u8bae\u89e3\u7801\u5668（\u5b57\u8282\u8f6c\u6d88\u606f）\u2192 \u9274\u6743\/\u4e1a\u52a1 Handler \u5904\u7406\u3002\u5904\u7406\u5b8c\u6210\u53ef\u9009\u5199\u51fa：\u4e1a\u52a1 \u2192 \u7f16\u7801\u5668 \u2192 Head \u2192 \u5185\u6838\u3002\u671f\u95f4\u4efb\u4f55\u73af\u8282\u53ef\u62e6\u622a\u6216\u7ec8\u6b62\u4f20\u64ad\u3002<\/p>\n

                9. \u5982\u4f55\u5b9e\u73b0\u8fd0\u884c\u65f6\u52a8\u6001\u8c03\u6574 Pipeline？<\/p>\n

                \u8981\u70b9：pipeline \u652f\u6301 addBefore\/addAfter\/remove\/replace \u8fd0\u884c\u671f\u64cd\u4f5c，\u6846\u67b6\u81ea\u52a8\u8c03\u5ea6\u7ebf\u7a0b\u5b89\u5168\u3002\u5178\u578b\u573a\u666f：\u63e1\u624b\u671f\u6302\u534f\u8bae\u534f\u5546\u4e0e\u9274\u6743 Handler，\u5b8c\u6210\u540e remove \u6362\u6210\u7a33\u6001\u94fe；\u534f\u8bae\u70ed\u5347\u7ea7\u7528 replace\u3002\u6ce8\u610f\u987a\u5e8f\u8bed\u4e49\u4ee5\u5b9e\u9645\u6267\u884c\u65f6\u523b\u4e3a\u51c6\u3002<\/p>\n

                10. \u51fa\u7ad9\u4e8b\u4ef6\u5728 Pipeline \u4e2d\u7684\u4f20\u64ad\u6709\u4ec0\u4e48\u7279\u70b9？<\/p>\n

                \u8981\u70b9：\u51fa\u7ad9\u4e8b\u4ef6\u4ece\u89e6\u53d1\u70b9（\u6216 Tail）\u5411 Head \u4f20\u64ad，\u53ea\u7ecf\u8fc7\u51fa\u7ad9\u578b（Outbound\/Duplex）Handler，\u5165\u7ad9 Handler \u88ab\u8df3\u8fc7\u3002\u5199\u64cd\u4f5c\u4e0d\u662f\u7acb\u5373\u6267\u884c：\u5148\u8fdb ChannelOutboundBuffer \u6392\u961f，flush \u65f6\u624d\u771f\u6b63\u5199\u5185\u6838；\u7ed3\u679c\u901a\u8fc7 Future\/Listener \u5f02\u6b65\u53cd\u9988\u3002\u51fa\u7ad9 Handler \u53ef\u5b9e\u73b0\u6539\u5199\u3001\u7edf\u8ba1\u3001\u9650\u6d41，\u4f46\u5fc5\u987b\u7ee7\u7eed\u8c03\u7528 ctx.write \u5426\u5219\u6d88\u606f\u88ab\u541e\u3002<\/p>\n

                \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n","protected":false},"excerpt":{"rendered":"

                Netty Pipeline \u4e0e Handler \u4f53\u7cfb\u8be6\u89e3 \u5b9a\u4f4d：Netty \u76ee\u5f55\u7b2c 03 \u7bc7，Pipeline \u7ed3\u6784\u3001Handler \u4e0e Context\u3001\u4e8b\u4ef6\u4f20\u64ad\u673a\u5236\u4e0e\u7f16\u89e3\u7801\u63a5\u5165\u5168\u89e3 \u9002\u7528\u7248\u672c：Netty 4.1.x（JDK 8） \u76ee\u5f55
                \nChannelPipelineChannelHandler \u4e0e Context\u4e8b\u4ef6\u4f20\u64ad\u673a\u5236SimpleChannelInboundHandler\u7f16\u89e3\u7801\u5668\u63a5\u5165\u4f4d\u7f6e\u603b\u7ed3\u5e38\u89c1<\/p>\n","protected":false},"author":2,"featured_media":108631,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[188,78],"topic":[],"class_list":["post-108632","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-188","tag-78"],"yoast_head":"\nNetty Pipeline \u4e0e Handler \u4f53\u7cfb\u8be6\u89e3 - \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\/108632.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Netty Pipeline \u4e0e Handler \u4f53\u7cfb\u8be6\u89e3 - 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