/* * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//httpclient/src/java/org/apache/commons/httpclient/DefaultHttpMethodRetryHandler.java,v 1.3 2004/12/20 11:47:46 olegk Exp $ * $Revision: 480424 $ * $Date: 2006-11-29 06:56:49 +0100 (Wed, 29 Nov 2006) $ * * ==================================================================== * *  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.commons.httpclient;import java.io.IOException;import java.io.InterruptedIOException;import java.net.NoRouteToHostException;import java.net.UnknownHostException;/** * The default {@link HttpMethodRetryHandler} used by {@link HttpMethod}s. *  * @author Michael Becke * @author <a href="mailto:oleg -at- ural.ru">Oleg Kalnichevski</a> */public class DefaultHttpMethodRetryHandler implements HttpMethodRetryHandler {    private static Class SSL_HANDSHAKE_EXCEPTION = null;        static {        try {            SSL_HANDSHAKE_EXCEPTION = Class.forName("javax.net.ssl.SSLHandshakeException");        } catch (ClassNotFoundException ignore) {                   }    }    /** the number of times a method will be retried */    private int retryCount;        /** Whether or not methods that have successfully sent their request will be retried */    private boolean requestSentRetryEnabled;        /**     * Creates a new DefaultHttpMethodRetryHandler.     * @param retryCount the number of times a method will be retried     * @param requestSentRetryEnabled if true, methods that have successfully sent their request will be retried     */    public DefaultHttpMethodRetryHandler(int retryCount, boolean requestSentRetryEnabled) {        super();        this.retryCount = retryCount;        this.requestSentRetryEnabled = requestSentRetryEnabled;    }        /**     * Creates a new DefaultHttpMethodRetryHandler that retries up to 3 times     * but does not retry methods that have successfully sent their requests.     */    public DefaultHttpMethodRetryHandler() {        this(3, false);    }    /**      * Used <code>retryCount</code> and <code>requestSentRetryEnabled</code> to determine     * if the given method should be retried.     *      * @see HttpMethodRetryHandler#retryMethod(HttpMethod, IOException, int)     */    public boolean retryMethod(        final HttpMethod method,         final IOException exception,         int executionCount) {        if (method == null) {            throw new IllegalArgumentException("HTTP method may not be null");        }        if (exception == null) {            throw new IllegalArgumentException("Exception parameter may not be null");        }        // HttpMethod interface is the WORST thing ever done to HttpClient        if (method instanceof HttpMethodBase) {            if (((HttpMethodBase)method).isAborted()) {                return false;            }        }        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 NoRouteToHostException) {            // Host unreachable            return false;        }        if (SSL_HANDSHAKE_EXCEPTION != null && SSL_HANDSHAKE_EXCEPTION.isInstance(exception)) {            // SSL handshake exception            return false;        }        if (!method.isRequestSent() || 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;    }}