BarracudaDiscRackEnhydra


1   /*
2    * Enhydra Java Application Server Project
3    *
4    * The contents of this file are subject to the Enhydra Public License
5    * Version 1.1 (the "License"); you may not use this file except in
6    * compliance with the License. You may obtain a copy of the License on
7    * the Enhydra web site ( http://www.enhydra.org/ ).
8    *
9    * Software distributed under the License is distributed on an "AS IS"
10   * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
11   * the License for the specific terms governing rights and limitations
12   * under the License.
13   *
14   * The Initial Developer of the Enhydra Application Server is Lutris
15   * Technologies, Inc. The Enhydra Application Server and portions created
16   * by Lutris Technologies, Inc. are Copyright Lutris Technologies, Inc.
17   * All Rights Reserved.
18   *
19   * Contributor(s):
20   *
21   * $Id: BarracudaDiscRackEnhydra.java,v 1.5 2004/12/20 11:15:54 slobodan Exp $
22   */
23  
24  package barracudaDiscRack;
25  
26  import com.lutris.appserver.server.*;
27  import com.lutris.appserver.server.httpPresentation.*;
28  import com.lutris.appserver.server.session.*;
29  import com.lutris.util.*;
30  import javax.servlet.*;
31  import javax.servlet.http.*;
32  import java.util.*;
33  import java.io.*;
34  
35  /**
36   * The application object.
37   *
38   * Application-wide data would go here.
39   */
40  public class BarracudaDiscRackEnhydra extends StandardApplication {
41  
42      /*
43       *  A few methods you might want to add to.
44       *  See StandardApplication for more details.
45       */
46      public void startup(Config appConfig)
47      throws ApplicationException {
48          super.startup(appConfig);
49          //  Here is where you would read application-specific settings from
50          //  your config file.
51  
52          // setup the Disc Rack gateway to barracuda
53          try {
54              // setup the init parameters for the gateway
55              // if present in the applications config file
56              // default to the standard config from multiserver/enhydra
57              ServletConfig servletConfig =
58              this.getHttpPresentationManager().getServlet().getServletConfig();
59              Config gatewayConfig = appConfig.getConfig("InitGateway");
60              if ( null != gatewayConfig ) {
61                  servletConfig =
62                  new ServletConfigWrapper(
63                                                                  this.getHttpPresentationManager().getServletContext(),
64                                                                  gatewayConfig,
65                                                                  servletConfig.getServletName() );
66              }
67  
68              this.myDiscRackGateway = new DiscRackGateway();
69              this.myGatewayExtension = this.myDiscRackGateway.getEventExtension();
70              this.myDiscRackGateway.init( servletConfig );
71          } catch ( ServletException ex ) {
72              throw ( new ApplicationException( "Error initilising DiscRackGateway", ex ) );
73          } catch ( KeywordValueException ex ) {
74              throw ( new ApplicationException( "Error initilising DiscRackGateway", ex ) );
75          }
76      }
77      
78      /*
79      * destroy Barracuda Disc Rack gateway
80      */
81      public void shutdown () {
82          super.shutdown();
83          this.myDiscRackGateway.destroy();
84      }
85  
86      /**
87       * Default method used by <CODE>requestPreprocessor</CODE>
88       * to ensure that a session exists and initialize the
89       * <CODE>session</CODE> and <CODE>sessionData</CODE> fields
90       * in the <CODE>HttpPresentationComms</CODE> object.
91       * New sessions are only created on requests to presentation
92       * objects, not requests for other types of files (such as gifs).
93       * This avoids allocating multiple sessions when a browser makes
94       * multiple requests for HREFs.  If the session already exist, it
95       * is alwasy set in <CODE>comms</CODE><P>
96       *
97       * This normally looks up the session using a session key from
98       * a cookie.
99       *
100      * @param comms
101      *   Object containing request, response and redirect objects.
102      * @exception ApplicationException
103      *   If an error occurs setting up the session.
104      */
105     protected void ensureSession(HttpPresentationComms comms)
106     throws ApplicationException {
107 
108         try {
109             boolean isOkForSession = presentationManager.isPresentationRequest(comms.request) ||
110                                                              comms.request.getRequestURI().indexOf(this.myGatewayExtension) > -1;
111 
112             if ( isOkForSession ) {
113                 // FIX - verify OK
114                 comms.session = StandardAppUtil.getRequestSession(comms);
115             }
116             if ( comms.session != null &&
117                      sessionManager.sessionExists(comms.session.getSessionKey()) ) {
118                 /*
119                  * InitializeNewSession() sets up comms.sessionData, so
120                  * that it may be used if an application defines it's own
121                  * version of that method (after calling the super method,
122                  * it has a normal comms object to work with).
123                  * Therefore, if we did not call initializeNewSession(),
124                  * we have to initialize comms.sessionData here.
125                  */
126                 comms.sessionData = comms.session.getSessionData();
127             } else {
128 
129                 if ( isOkForSession ) {
130                     initializeNewSession(comms);
131                 }
132             }
133         } catch ( HttpPresentationException except ) {
134             throw new ApplicationException(except);
135         } catch ( SessionException except ) {
136             throw new ApplicationException(except);
137         }
138     }
139 
140     public boolean requestPreprocessor(HttpPresentationComms comms)
141     throws Exception  {
142         boolean retVal = super.requestPreprocessor(comms);
143         if ( !retVal ) {
144             String   target = comms.request.getRequestURI();
145             // if has the event extension in the URI then treat it as a barracuda event
146             if ( target.indexOf(this.myGatewayExtension) > -1 ) {
147                 this.myDiscRackGateway.handleDefaultExt(
148                                                                                              comms.request.getHttpServletRequest(),
149                                                                                              comms.response.getHttpServletResponse(),
150                                                                                              comms );
151                 retVal = true;
152             }
153         }
154         return retVal;
155     }
156 
157     /**
158      * This is an optional function, used only by the Multiserver's graphical
159      * administration. This bit of HTML appears in the status page for this
160      * application. You could add extra status info, for example
161      * a list of currently logged in users.
162      *
163      * @return HTML that is displayed in the status page of the Multiserver.
164      */
165     public String   toHtml() {
166         return "This is <I>DiscRack</I>";
167     }
168 
169     private DiscRackGateway myDiscRackGateway;
170     private String   myGatewayExtension;
171 }
172 
173 
174 class ServletConfigWrapper implements ServletConfig {
175 
176     private ServletContext myContext;
177     private Config myConfig;
178     private String   myName;
179 
180     public ServletConfigWrapper( ServletContext context, Config config, String   name ) {
181         this.myContext = context;
182         this.myConfig = config;
183         this.myName = name;
184     }
185 
186     public ServletContext getServletContext() {
187         return this.myContext;
188     }
189 
190     public String   getInitParameter(String   name) {
191         String   retVal = null;
192         try {
193             retVal = this.myConfig.getString(name);
194         } catch ( KeywordValueException ex ) {
195         }
196         return retVal;
197     }
198 
199     public Enumeration getInitParameterNames() {
200         return( Collections.enumeration(Arrays.asList(this.myConfig.keys())) );
201     }
202 
203     public String   getServletName() {
204         return this.myName;
205     }
206 
207 }
208
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