1 /* 2 * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk/module-client/src/main/java/org/apache/http/client/RequestDirector.java $ 3 * $Revision: 676020 $ 4 * $Date: 2008-07-11 09:38:49 -0700 (Fri, 11 Jul 2008) $ 5 * 6 * ==================================================================== 7 * Licensed to the Apache Software Foundation (ASF) under one 8 * or more contributor license agreements. See the NOTICE file 9 * distributed with this work for additional information 10 * regarding copyright ownership. The ASF licenses this file 11 * to you under the Apache License, Version 2.0 (the 12 * "License"); you may not use this file except in compliance 13 * with the License. You may obtain a copy of the License at 14 * 15 * http://www.apache.org/licenses/LICENSE-2.0 16 * 17 * Unless required by applicable law or agreed to in writing, 18 * software distributed under the License is distributed on an 19 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 20 * KIND, either express or implied. See the License for the 21 * specific language governing permissions and limitations 22 * under the License. 23 * ==================================================================== 24 * 25 * This software consists of voluntary contributions made by many 26 * individuals on behalf of the Apache Software Foundation. For more 27 * information on the Apache Software Foundation, please see 28 * <http://www.apache.org/>. 29 * 30 */ 31 32 package org.apache.http.client; 33 34 import java.io.IOException; 35 36 import org.apache.http.HttpHost; 37 import org.apache.http.HttpRequest; 38 import org.apache.http.HttpResponse; 39 import org.apache.http.HttpException; 40 import org.apache.http.protocol.HttpContext; 41 42 /** 43 * A client-side request director. 44 * The director decides which steps are necessary to execute a request. 45 * It establishes connections and optionally processes redirects and 46 * authentication challenges. The director may therefore generate and 47 * send a sequence of requests in order to execute one initial request. 48 * 49 * <br/><b>Note:</b> 50 * It is most likely that implementations of this interface will 51 * allocate connections, and return responses that depend on those 52 * connections for reading the response entity. Such connections 53 * MUST be released, but that is out of the scope of a request director. 54 * 55 * @author <a href="mailto:rolandw at apache.org">Roland Weber</a> 56 * 57 * 58 * <!-- empty lines to avoid svn diff problems --> 59 * @version $Revision: 676020 $ 60 * 61 * @since 4.0 62 */ 63 public interface RequestDirector { 64 65 66 /** 67 * Executes a request. 68 * <br/><b>Note:</b> 69 * For the time being, a new director is instantiated for each request. 70 * This is the same behavior as for <code>HttpMethodDirector</code> 71 * in HttpClient 3. 72 * 73 * @param target the target host for the request. 74 * Implementations may accept <code>null</code> 75 * if they can still determine a route, for example 76 * to a default target or by inspecting the request. 77 * @param request the request to execute 78 * @param context the context for executing the request 79 * 80 * @return the final response to the request. 81 * This is never an intermediate response with status code 1xx. 82 * 83 * @throws HttpException in case of a problem 84 * @throws IOException in case of an IO problem 85 * or if the connection was aborted 86 */ execute(HttpHost target, HttpRequest request, HttpContext context)87 HttpResponse execute(HttpHost target, HttpRequest request, 88 HttpContext context) 89 throws HttpException, IOException 90 ; 91 92 } // class ClientRequestDirector 93