合并结果扩展

<dubbo:method merger="xxx" />

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

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

xxx=com.xxx.XxxMerger