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From s...@brm.com
Subject Tomcat and WAP phones
Date Thu, 09 Nov 2000 19:52:42 GMT
Hi all,
 
While developing Tomcat based application for mobile phone, I have found out
that the lack of cookies support in WAP phones, will not let me run my
servlets on Tomcat load balance configuration.
In order to point Apache to two tomcats, I needed the apache to use the
jvmRoute section in the cookie to route the requests back to the original
Tomcat (using mod_jk).
 
Since the urls in the wml has written using the encodeurl function that does
not support adding the '.jvmRoute' to the url, the followed requests come
from the user without specifying the origin Tomcat (since there are no
cookies).
 
In order to fix that I have written RequestInterceptor to allow URL session
support to work with multiple Tomcat configuration.
To use that you must REPLACE the SessionInterceptor with the new
interceptor. Here is that part of server.xml:
 
<!--
     Commented out by Shai Fultheim to enable url session interceptor.
        <RequestInterceptor 
            className="org.apache.tomcat.request.SessionInterceptor" />
 
-->
        <RequestInterceptor 
            className="org.apache.tomcat.session.URLSessionInterceptor"
         debug="1" />
 
The interceptor is  part of session package in order to use the
(StandartSession.)encodeUrl.
 
The interceptor source file attached. Source Code below:
/*
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * 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/>.
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */
 
/*
 * This Interceptor written by Shai Fultheim, shai@brm.com.
 *
 * Being used to rewrite the sessionID to include JVM ID(jvmRoute).
 * This will allow (Response.)encodeUrl to work in  multi tomcats
 * configuration.
 *
 * The class is part of session package in order to use the
 * (StandartSession.)encodeUrl.
 * 
 * All changes to: Shai Fultheim, shai@brm.com
 */
 
package org.apache.tomcat.session;
 
import org.apache.tomcat.core.*;
 
public class URLSessionInterceptor extends  BaseInterceptor
{
    // Separates the session id from the jvm route
    static final char SESSIONID_ROUTE_SEP = '.';
    ContextManager cm;
    int manager_note;
 
    public URLSessionInterceptor() {
    }
 
     // Called on init. Takes the context manager (used for logging) and
     // the standardManager address.
     public void engineInit( ContextManager cm ) throws TomcatException {
         this.cm = cm;
 
         // set-up a per/container note for StandardManager
         manager_note = cm.getNoteId(ContextManager.CONTAINER_NOTE,
"tomcat.standardManager");
 
         if ( debug > 0 ) cm.log("URLSessionInterceptor: Started");
     }
 
     // Called every time the servlet ask for NEW session.
     public int newSessionRequest(Request request, Response response) {
         String jvmRoute = request.getJvmRoute();
 
         // Check whether SessionInterceptor hasn't been removed from
         // server.xml
         if( request.getSession( false ) != null ) {
              cm.log("Request has Seesion object. exiting");
              return 0;
         }
 
         // Get context's Manager interface and create new session by that
interface.
         // NOTE: Session exists only in our context.
         StandardSession session =
              (StandardSession)
 
((StandardManager)request.getContext().getContainer().getNote(manager_note))
                       .getNewSession();
 
         // Add jvmRoute (if we have it)
         if(jvmRoute != null) {
              session.setId(session.getId() + "." + jvmRoute);
              if (debug > 0) cm.log("Creating.   jvmRoute=" + jvmRoute);
         }
 
         // Attach session to request.
         request.setSession(session);
 
         if (debug > 0) cm.log("Creating.   SessionID=" +
request.getSession(false).getId());
 
         return 0;
    }
 
    // Extract the session id from the request. URLSessionInterceptor
    // will have to be called _before_ mapper, to avoid coding session
    // stuff inside the mapper.
    public int contextMap(Request request ) {
// Check whether SessionInterceptor hasn't been removed from
         // server.xml
          if( request.getRequestedSessionId() != null ) {
               cm.log("Another interceptor tried to set SessionID.
exiting");
             return 0;
         }
 
    int foundAt = -1;
    String sig  = ";jsessionid=";
    String uri  = request.getRequestURI();
    String sessionId;
 
     // Take SessionID out of the URL
    if ((foundAt = uri.indexOf(sig)) != -1){
             sessionId=uri.substring(foundAt+sig.length());
             request.setRequestURI(uri.substring(0, foundAt));
             request.setSessionIdSource(Request.SESSIONID_FROM_URL);
             request.setRequestedSessionId(sessionId);
          if (debug > 0) cm.log("Retrieving. SessionID=" + sessionId);
    } else
          if (debug > 0) cm.log("No '" + sig + "' in url. New request?");
 
    return 0;
}
}
 
 
 
 
________________________
Shai Fultheim
Chief Technology Officer
BRM Seed <http://www.brm.com/> 
 
E-Mail: shai@brm.com <mailto:shai@brm.com> 
Mobile: 972-53-866-459
Office: 972-2-5891-459
 

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