从多个服务提者方中选择一个进行调用。
com.alibaba.dubbo.rpc.cluster.RouterFactory
com.alibaba.dubbo.rpc.cluster.Router
<dubbo:protocol router="xxx" /> <dubbo:provider router="xxx" /> <!-- 缺省值设置,当<dubbo:protocol>没有配置loadbalance时,使用此配置 -->
com.alibaba.dubbo.rpc.cluster.router.ScriptRouterFactory
com.alibaba.dubbo.rpc.cluster.router.FileRouterFactory
Maven项目结构
src |-main |-java |-com |-xxx |-XxxRouterFactory.java (实现LoadBalance接口) |-resources |-META-INF |-dubbo |-com.alibaba.dubbo.rpc.cluster.RouterFactory (纯文本文件,内容为:xxx=com.xxx.XxxRouterFactory)
XxxRouterFactory.java
package com.xxx; import com.alibaba.dubbo.rpc.cluster.RouterFactory; import com.alibaba.dubbo.rpc.Invoker; import com.alibaba.dubbo.rpc.Invocation; import com.alibaba.dubbo.rpc.RpcException; public class XxxRouterFactory implements RouterFactory { public <T> List<Invoker<T>> select(List<Invoker<T>> invokers, Invocation invocation) throws RpcException { // ... } }
META-INF/dubbo/com.alibaba.dubbo.rpc.cluster.RouterFactory
xxx=com.xxx.XxxRouterFactory