httpmethodretryhandler.java

Light in the box 抓取程序。 使用HttpClient

/*
 * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//httpclient/src/java/org/apache/commons/httpclient/HttpMethodRetryHandler.java,v 1.2 2004/09/14 20:11:31 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;

/**
 * A handler for determining if an HttpMethod should be retried after a 
 * recoverable exception during execution.
 * 
 * <p>
 * Classes implementing this interface must synchronize access to shared
 * data as methods of this interfrace may be executed from multiple threads 
 * </p>
 * 
 * @see HttpMethod#execute(HttpState, HttpConnection)
 * 
 * @author Michael Becke
 * @author <a href="mailto:oleg -at- ural.ru">Oleg Kalnichevski</a>
 */
public interface HttpMethodRetryHandler {

    /**
     * Determines if a method should be retried after an HttpRecoverableException
     * occurs during execution.
     * 
     * @param method the method being executed
     * @param exception the exception that occurred
     * @param executionCount the number of times this method has been 
     * unsuccessfully executed
     * 
     * @return <code>true</code> if the method should be retried, <code>false</code>
     * otherwise
     */
    boolean retryMethod(HttpMethod method, IOException exception, int executionCount);

}