集群扩展

扩展说明

当有多个服务提供方时，将多个服务提供方组织成一个集群，并伪装成一个提供方。

扩展接口

org.apache.dubbo.rpc.cluster.Cluster

扩展配置

  1. <dubbo:protocol cluster="xxx" />
  2. <!-- 缺省值配置，如果<dubbo:protocol>没有配置cluster时，使用此配置 -->
  3. <dubbo:provider cluster="xxx" />

已知扩展

  • org.apache.dubbo.rpc.cluster.support.wrapper.MockClusterWrapper
  • org.apache.dubbo.rpc.cluster.support.FailoverCluster
  • org.apache.dubbo.rpc.cluster.support.FailfastCluster
  • org.apache.dubbo.rpc.cluster.support.FailsafeCluster
  • org.apache.dubbo.rpc.cluster.support.FailbackCluster
  • org.apache.dubbo.rpc.cluster.support.ForkingCluster
  • org.apache.dubbo.rpc.cluster.support.AvailableCluster
  • org.apache.dubbo.rpc.cluster.support.MergeableCluster
  • org.apache.dubbo.rpc.cluster.support.BroadcastCluster
  • org.apache.dubbo.rpc.cluster.support.registry.ZoneAwareCluster

扩展示例

Maven 项目结构：

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

XxxCluster.java：

  1. package com.xxx;
  3. import org.apache.dubbo.rpc.cluster.Cluster;
  4. import org.apache.dubbo.rpc.cluster.support.AbstractClusterInvoker;
  5. import org.apache.dubbo.rpc.cluster.Directory;
  6. import org.apache.dubbo.rpc.cluster.LoadBalance;
  7. import org.apache.dubbo.rpc.Invoker;
  8. import org.apache.dubbo.rpc.Invocation;
  9. import org.apache.dubbo.rpc.Result;
  10. import org.apache.dubbo.rpc.RpcException;
  12. public class XxxCluster implements Cluster {
  13.     public <T> Invoker<T> merge(Directory<T> directory) throws RpcException {
  14.         return new AbstractClusterInvoker<T>(directory) {
  15.             public Result doInvoke(Invocation invocation, List<Invoker<T>> invokers, LoadBalance loadbalance) throws RpcException {
  16.                 // ...
  17.             }
  18.         };
  19.     }
  20. }

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

  1. xxx=com.xxx.XxxCluster

最后修改 September 21, 2021: Bug fix miss mialbox (#953) (57cf51b)