合并结果扩展

合并结果扩展

扩展说明

合并返回结果，用于分组聚合。

扩展接口

org.apache.dubbo.rpc.cluster.Merger

扩展配置

  1. <dubbo:method merger="xxx" />

已知扩展

  • 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
  • org.apache.dubbo.rpc.cluster.merger.ByteArrayMerger
  • org.apache.dubbo.rpc.cluster.merger.CharArrayMerger
  • org.apache.dubbo.rpc.cluster.merger.ShortArrayMerger
  • org.apache.dubbo.rpc.cluster.merger.IntArrayMerger
  • org.apache.dubbo.rpc.cluster.merger.LongArrayMerger
  • org.apache.dubbo.rpc.cluster.merger.FloatArrayMerger
  • org.apache.dubbo.rpc.cluster.merger.DoubleArrayMerger
  • org.apache.dubbo.rpc.cluster.merger.BooleanArrayMerger

扩展示例

Maven 项目结构：

  1. src
  2.  |-main
  3.     |-java
  4.         |-com
  5.             |-xxx
  6.                 |-XxxMerger.java (实现Merger接口)
  7.     |-resources
  8.         |-META-INF
  9.             |-dubbo
  10.                 |-org.apache.dubbo.rpc.cluster.Merger (纯文本文件，内容为：xxx=com.xxx.XxxMerger)

XxxMerger.java：

  1. package com.xxx;
  3. import org.apache.dubbo.rpc.cluster.Merger;
  5. public class XxxMerger<T> implements Merger<T> {
  6.     public T merge(T... results) {
  7.         // ...
  8.     }
  9. }

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

  1. xxx=com.xxx.XxxMerger

最后修改 March 2, 2023: Fix alias forward in docs3-v2 (#2342) (f16c1535592)