1. 扩展说明

合并返回结果，用于分组聚合。

2. 扩展接口

com.alibaba.dubbo.rpc.cluster.Merger

3. 扩展配置

<dubbo:method merger="xxx" />

4. 已知扩展

• com.alibaba.dubbo.rpc.cluster.merger.ArrayMerger
• com.alibaba.dubbo.rpc.cluster.merger.ListMerger
• com.alibaba.dubbo.rpc.cluster.merger.SetMerger
• com.alibaba.dubbo.rpc.cluster.merger.MapMerger

5. 扩展示例

Maven项目结构

src
 |-main
    |-java
        |-com
            |-xxx
                |-XxxMerger.java (实现Merger接口)
    |-resources
        |-META-INF
            |-dubbo
                |-com.alibaba.dubbo.rpc.cluster.Merger (纯文本文件，内容为：xxx=com.xxx.XxxMerger)

XxxMerger.java

package com.xxx;
 
import com.alibaba.dubbo.rpc.cluster.Merger;
 
public class XxxMerger<T> implements Merger<T> {
    public T merge(T... results) {
        // ...
    }
}

META-INF/dubbo/com.alibaba.dubbo.rpc.cluster.Merger

xxx=com.xxx.XxxMerger