| /** |
| * 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.hadoop.io.retry; |
| |
| import java.lang.reflect.Method; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.ipc.RetriableException; |
| |
| /** |
| * A dummy invocation handler extending RetryInvocationHandler. It drops the |
| * first N number of responses. This invocation handler is only used for testing. |
| */ |
| @InterfaceAudience.Private |
| public class LossyRetryInvocationHandler<T> extends RetryInvocationHandler<T> { |
| private final int numToDrop; |
| private static final ThreadLocal<Integer> RetryCount = |
| new ThreadLocal<Integer>(); |
| |
| public LossyRetryInvocationHandler(int numToDrop, |
| FailoverProxyProvider<T> proxyProvider, RetryPolicy retryPolicy) { |
| super(proxyProvider, retryPolicy); |
| this.numToDrop = numToDrop; |
| } |
| |
| @Override |
| public Object invoke(Object proxy, Method method, Object[] args) |
| throws Throwable { |
| RetryCount.set(0); |
| return super.invoke(proxy, method, args); |
| } |
| |
| @Override |
| protected Object invokeMethod(Method method, Object[] args) throws Throwable { |
| Object result = super.invokeMethod(method, args); |
| int retryCount = RetryCount.get(); |
| if (retryCount < this.numToDrop) { |
| RetryCount.set(++retryCount); |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Drop the response. Current retryCount == " + retryCount); |
| } |
| throw new RetriableException("Fake Exception"); |
| } else { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("retryCount == " + retryCount |
| + ". It's time to normally process the response"); |
| } |
| return result; |
| } |
| } |
| } |