9.15. 消息派发扩展

<dubbo:protocol dispatcher="xxx" />
<!-- 缺省值设置，当<dubbo:protocol>没有配置dispatcher属性时，使用此配置 -->
<dubbo:provider dispatcher="xxx" />

• org.apache.dubbo.remoting.transport.dispatcher.all.AllDispatcher
• org.apache.dubbo.remoting.transport.dispatcher.direct.DirectDispatcher
• org.apache.dubbo.remoting.transport.dispatcher.message.MessageOnlyDispatcher
• org.apache.dubbo.remoting.transport.dispatcher.execution.ExecutionDispatcher
• org.apache.dubbo.remoting.transport.dispatcher.connection.ConnectionOrderedDispatcher

• Maven 项目结构：

  src
   |-main
      |-java
          |-com
              |-xxx
                  |-XxxDispatcher.java (实现Dispatcher接口)
      |-resources
          |-META-INF
              |-dubbo
                  |-org.apache.dubbo.remoting.Dispatcher (纯文本文件，内容为：xxx=com.xxx.XxxDispatcher)
  

• XxxDispatcher.java：

  package com.xxx;
  import org.apache.dubbo.remoting.Dispatcher;
  public class XxxDispatcher implements Dispatcher {
      public Group lookup(URL url) {
          // ...
      }
  }
  

• META-INF/dubbo/org.apache.dubbo.remoting.Dispatcher：

  xxx=com.xxx.XxxDispatcher