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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