| /* |
| * 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.support; |
| |
| import org.apache.dubbo.common.logger.ErrorTypeAwareLogger; |
| import org.apache.dubbo.common.logger.LoggerFactory; |
| import org.apache.dubbo.rpc.AsyncRpcResult; |
| import org.apache.dubbo.rpc.Invocation; |
| import org.apache.dubbo.rpc.Invoker; |
| import org.apache.dubbo.rpc.Result; |
| import org.apache.dubbo.rpc.RpcException; |
| import org.apache.dubbo.rpc.cluster.Directory; |
| import org.apache.dubbo.rpc.cluster.LoadBalance; |
| |
| import java.util.List; |
| |
| import static org.apache.dubbo.common.constants.LoggerCodeConstants.CLUSTER_ERROR_RESPONSE; |
| |
| /** |
| * When invoke fails, log the error message and ignore this error by returning an empty Result. |
| * Usually used to write audit logs and other operations |
| * |
| * <a href="http://en.wikipedia.org/wiki/Fail-safe">Fail-safe</a> |
| * |
| */ |
| public class FailsafeClusterInvoker<T> extends AbstractClusterInvoker<T> { |
| private static final ErrorTypeAwareLogger logger = LoggerFactory.getErrorTypeAwareLogger(FailsafeClusterInvoker.class); |
| |
| public FailsafeClusterInvoker(Directory<T> directory) { |
| super(directory); |
| } |
| |
| @Override |
| 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 invokeWithContext(invoker, invocation); |
| } catch (Throwable e) { |
| logger.error(CLUSTER_ERROR_RESPONSE,"Failsafe for provider exception","","Failsafe ignore exception: " + e.getMessage(),e); |
| return AsyncRpcResult.newDefaultAsyncResult(null, null, invocation); // ignore |
| } |
| } |
| } |