dubbo LoadBalance 源码
dubbo LoadBalance 代码
文件路径：/dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/LoadBalance.java
/*
* 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 org.apache.dubbo.rpc.cluster;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.extension.Adaptive;
import org.apache.dubbo.common.extension.SPI;
import org.apache.dubbo.rpc.Invocation;
import org.apache.dubbo.rpc.Invoker;
import org.apache.dubbo.rpc.RpcException;
import org.apache.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 org.apache.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;
}
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