Dubbo3 集群拓展

擴展說明

當有多個服務(wù)提供方時，將多個服務(wù)提供方組織成一個集群，并偽裝成一個提供方。

擴展接口

org.apache.dubbo.rpc.cluster.Cluster

擴展配置

<dubbo:protocol cluster="xxx" />
<!-- 缺省值配置，如果<dubbo:protocol>沒有配置cluster時，使用此配置 -->
<dubbo:provider cluster="xxx" />

已知擴展

• 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

擴展示例

Maven 項目結(jié)構(gòu)：

src
 |-main
    |-java
        |-com
            |-xxx
                |-XxxCluster.java (實現(xiàn)Cluster接口)
    |-resources
        |-META-INF
            |-dubbo
                |-org.apache.dubbo.rpc.cluster.Cluster (純文本文件，內(nèi)容為：xxx=com.xxx.XxxCluster)

XxxCluster.java：

package com.xxx;
 
import org.apache.dubbo.rpc.cluster.Cluster;
import org.apache.dubbo.rpc.cluster.support.AbstractClusterInvoker;
import org.apache.dubbo.rpc.cluster.Directory;
import org.apache.dubbo.rpc.cluster.LoadBalance;
import org.apache.dubbo.rpc.Invoker;
import org.apache.dubbo.rpc.Invocation;
import org.apache.dubbo.rpc.Result;
import org.apache.dubbo.rpc.RpcException;
 
public class XxxCluster implements Cluster {
    public <T> Invoker<T> merge(Directory<T> directory) throws RpcException {
        return new AbstractClusterInvoker<T>(directory) {
            public Result doInvoke(Invocation invocation, List<Invoker<T>> invokers, LoadBalance loadbalance) throws RpcException {
                // ...
            }
        };
    }
}

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

xxx=com.xxx.XxxCluster