Skip to content

Merger Extension

Summary

Merge strategy for return result aggregation in group.

Extension Interface

org.apache.dubbo.rpc.cluster.Merger

Extension Configuration

<dubbo:method merger="xxx" />

Existing Extension

  • org.apache.dubbo.rpc.cluster.merger.ArrayMerger
  • org.apache.dubbo.rpc.cluster.merger.ListMerger
  • org.apache.dubbo.rpc.cluster.merger.SetMerger
  • org.apache.dubbo.rpc.cluster.merger.MapMerger

Extension Guide

Directory layout:

src
 |-main
    |-java
        |-com
            |-xxx
                |-XxxMerger.java (Merger implementation)
    |-resources
        |-META-INF
            |-dubbo
                |-org.apache.dubbo.rpc.cluster.Merger (plain text file with the content: xxx=com.xxx.XxxMerger)

XxxMerger.java：

package com.xxx;

import org.apache.dubbo.rpc.cluster.Merger;

public class XxxMerger<T> implements Merger<T> {
    public T merge(T... results) {
        // ...
    }
}

META-INF/dubbo/org.apache.dubbo.rpc.cluster.Merger：

xxx=com.xxx.XxxMerger