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1 /* 2 * ==================================================================== 3 * 4 * The Apache Software License, Version 1.1 5 * 6 * Copyright (c) 2001-2002 The Apache Software Foundation. All rights 7 * reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. The end-user documentation included with the redistribution, if 22 * any, must include the following acknowlegement: 23 * "This product includes software developed by the 24 * Apache Software Foundation (http://www.apache.org/)." 25 * Alternately, this acknowlegement may appear in the software itself, 26 * if and wherever such third-party acknowlegements normally appear. 27 * 28 * 4. The names "The Jakarta Project", "Stronghold" and "Apache Software 29 * Foundation" must not be used to endorse or promote products 30 * derived from this software without prior written permission. For 31 * written permission, please contact apache@apache.org. 32 * 33 * 5. Products derived from this software may not be called "Apache" 34 * nor may "Apache" appear in their names without prior written 35 * permission of the Apache Group. 36 * 37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48 * SUCH DAMAGE. 49 * ==================================================================== 50 * 51 * This software consists of voluntary contributions made by many 52 * individuals on behalf of the Apache Software Foundation. For more 53 * information on the Apache Software Foundation, please see 54 * <http://www.apache.org/>;. 55 * 56 */ 57 package org.apache.sesame.filter; 58 59 import org.apache.commons.httpclient.HttpClient; 60 import org.apache.commons.httpclient.methods.GetMethod; 61 import org.apache.sesame.model.Request; 62 63 import javax.servlet.ServletRequest; 64 import javax.servlet.ServletResponse; 65 import javax.servlet.FilterChain; 66 import javax.servlet.ServletException; 67 import java.io.IOException; 68 69 /*** 70 * Performs an HTTP connection to the back end application. The 71 * {@link org.apache.sesame.model.Request} object must have been put as an 72 * HTTP attribute and be filled correctly prior to this filter being invoked. 73 * This must be the last filter in the chain. 74 * 75 * @author <a href="mailto:vmassol@apache.org">Vincent Massol</a> 76 * 77 * @version $Id: ConnectionFilter.java,v 1.2 2002/06/03 18:18:25 vmassol Exp $ 78 */ 79 public class ConnectionFilter extends AbstractFilter 80 { 81 /*** 82 * @see AbstractFilter#execute(ServletRequest, ServletResponse, FilterChain) 83 */ 84 public void execute(ServletRequest servletRequest, 85 ServletResponse servletResponse, FilterChain filterChain) 86 throws IOException, ServletException 87 { 88 // Retrieves request information 89 Request request = getApplicationRequest(servletRequest); 90 91 // todo: Verify parameter validity 92 93 // Connect to the host 94 // todo: improve perfs by reusing session 95 // todo: add support for POST method 96 HttpClient client = new HttpClient(); 97 client.startSession(request.gethost(), request.getPort()); 98 GetMethod method = new GetMethod(request.getURI()); 99 method.setUseDisk(false); 100 101 try { 102 client.executeMethod(method); 103 } catch (Exception e) { 104 throw new ServletException("Failed to connect to request = [" + 105 request + "]"); 106 } 107 108 // Write the result to the client 109 servletResponse.getOutputStream().write( 110 method.getResponseBody()); 111 } 112 }

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