/* | |
* Licensed to the Apache Software Foundation (ASF) under one or more | |
* contributor license agreements. See the NOTICE file distributed with | |
* this work for additional information regarding copyright ownership. | |
* The ASF licenses this file to You under the Apache License, Version 2.0 | |
* (the "License"); you may not use this file except in compliance with | |
* the License. You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, | |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
*/ | |
package com.alibaba.dubbo.rpc.cluster; | |
import com.alibaba.dubbo.common.URL; | |
import com.alibaba.dubbo.common.extension.Adaptive; | |
import com.alibaba.dubbo.common.extension.SPI; | |
import com.alibaba.dubbo.rpc.Invocation; | |
import com.alibaba.dubbo.rpc.Invoker; | |
import com.alibaba.dubbo.rpc.RpcException; | |
import com.alibaba.dubbo.rpc.cluster.loadbalance.RandomLoadBalance; | |
import java.util.List; | |
/** | |
* LoadBalance. (SPI, Singleton, ThreadSafe) | |
* <p> | |
* <a href="http://en.wikipedia.org/wiki/Load_balancing_(computing)">Load-Balancing</a> | |
* | |
* @see com.alibaba.dubbo.rpc.cluster.Cluster#join(Directory) | |
*/ | |
@SPI(RandomLoadBalance.NAME) | |
public interface LoadBalance { | |
/** | |
* select one invoker in list. | |
* | |
* @param invokers invokers. | |
* @param url refer url | |
* @param invocation invocation. | |
* @return selected invoker. | |
*/ | |
@Adaptive("loadbalance") | |
<T> Invoker<T> select(List<Invoker<T>> invokers, URL url, Invocation invocation) throws RpcException; | |
} |