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/*
* $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/impl/client/DefaultHttpRequestRetryHandler.java $
* $Revision: 652726 $
* $Date: 2008-05-01 18:16:51 -0700 (Thu, 01 May 2008) $
*
* ====================================================================
* 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.http.impl.client;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.net.UnknownHostException;
import javax.net.ssl.SSLHandshakeException;
import org.apache.http.NoHttpResponseException;
import org.apache.http.client.HttpRequestRetryHandler;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.ExecutionContext;
/**
* The default {@link HttpRequestRetryHandler} used by request executors.
*
* @author Michael Becke
* @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
*/
public class DefaultHttpRequestRetryHandler implements HttpRequestRetryHandler {
/** the number of times a method will be retried */
private final int retryCount;
/** Whether or not methods that have successfully sent their request will be retried */
private final boolean requestSentRetryEnabled;
/**
* Default constructor
*/
public DefaultHttpRequestRetryHandler(int retryCount, boolean requestSentRetryEnabled) {
super();
this.retryCount = retryCount;
this.requestSentRetryEnabled = requestSentRetryEnabled;
}
/**
* Default constructor
*/
public DefaultHttpRequestRetryHandler() {
this(3, false);
}
/**
* Used <code>retryCount</code> and <code>requestSentRetryEnabled</code> to determine
* if the given method should be retried.
*/
public boolean retryRequest(
final IOException exception,
int executionCount,
final HttpContext context) {
if (exception == null) {
throw new IllegalArgumentException("Exception parameter may not be null");
}
if (context == null) {
throw new IllegalArgumentException("HTTP context may not be null");
}
if (executionCount > this.retryCount) {
// Do not retry if over max retry count
return false;
}
if (exception instanceof NoHttpResponseException) {
// Retry if the server dropped connection on us
return true;
}
if (exception instanceof InterruptedIOException) {
// Timeout
return false;
}
if (exception instanceof UnknownHostException) {
// Unknown host
return false;
}
if (exception instanceof SSLHandshakeException) {
// SSL handshake exception
return false;
}
Boolean b = (Boolean)
context.getAttribute(ExecutionContext.HTTP_REQ_SENT);
boolean sent = (b != null && b.booleanValue());
if (!sent || this.requestSentRetryEnabled) {
// Retry if the request has not been sent fully or
// if it's OK to retry methods that have been sent
return true;
}
// otherwise do not retry
return false;
}
/**
* @return <code>true</code> if this handler will retry methods that have
* successfully sent their request, <code>false</code> otherwise
*/
public boolean isRequestSentRetryEnabled() {
return requestSentRetryEnabled;
}
/**
* @return the maximum number of times a method will be retried
*/
public int getRetryCount() {
return retryCount;
}
}
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