Message Dispatch Extension

<dubbo:protocol dispatcher="xxx" />
<!-- The default value setting, when <dubbo:protocol> does not configure the dispatcher attribute, use this configuration -->
<dubbo:provider dispatcher="xxx" />

src
 |-main
    |-java
        |-com
            |-xxx
                |-XxxDispatcher.java (implements the Dispatcher interface)
    |-resources
        |-META-INF
            |-dubbo
                |-org.apache.dubbo.remoting.Dispatcher (plain text file, content: xxx=com.xxx.XxxDispatcher)

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

xxx=com.xxx.XxxDispatcher