hadoop LossyRetryInvocationHandler 源码
haddop LossyRetryInvocationHandler 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/retry/LossyRetryInvocationHandler.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.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;
}
}
}
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