/* | |
* Copyright 1999-2011 Alibaba Group. | |
* | |
* Licensed 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.support; | |
import java.util.List; | |
import com.alibaba.dubbo.rpc.Invocation; | |
import com.alibaba.dubbo.rpc.Invoker; | |
import com.alibaba.dubbo.rpc.Result; | |
import com.alibaba.dubbo.rpc.RpcException; | |
import com.alibaba.dubbo.rpc.cluster.Cluster; | |
import com.alibaba.dubbo.rpc.cluster.Directory; | |
import com.alibaba.dubbo.rpc.cluster.LoadBalance; | |
/** | |
* AvailableCluster | |
* | |
* @author william.liangf | |
*/ | |
public class AvailableCluster implements Cluster { | |
public static final String NAME = "available"; | |
public <T> Invoker<T> join(Directory<T> directory) throws RpcException { | |
return new AbstractClusterInvoker<T>(directory) { | |
public Result doInvoke(Invocation invocation, List<Invoker<T>> invokers, LoadBalance loadbalance) throws RpcException { | |
for (Invoker<T> invoker : invokers) { | |
if (invoker.isAvailable()) { | |
return invoker.invoke(invocation); | |
} | |
} | |
throw new RpcException("No provider available in " + invokers); | |
} | |
}; | |
} | |
} |