/* * 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.common.logger.Logger; import com.alibaba.dubbo.common.logger.LoggerFactory; 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.RpcResult; import com.alibaba.dubbo.rpc.cluster.Directory; import com.alibaba.dubbo.rpc.cluster.LoadBalance; /** * 失败安全,出现异常时,直接忽略,通常用于写入审计日志等操作。 * * <a href="http://en.wikipedia.org/wiki/Fail-safe">Fail-safe</a> * * @author william.liangf */ public class FailsafeClusterInvoker<T> extends AbstractClusterInvoker<T>{ private static final Logger logger = LoggerFactory.getLogger(FailsafeClusterInvoker.class); public FailsafeClusterInvoker(Directory<T> directory) { super(directory); } public Result doInvoke(Invocation invocation, List<Invoker<T>> invokers, LoadBalance loadbalance) throws RpcException { try { checkInvokers(invokers, invocation); Invoker<T> invoker = select(loadbalance, invocation, invokers, null); return invoker.invoke(invocation); } catch (Throwable e) { logger.error("Failsafe ignore exception: " + e.getMessage(), e); return new RpcResult(); // ignore } } }