| /* |
| * $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; |
| } |
| } |