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/*
Wotonomy: OpenStep design patterns for pure Java applications.
Copyright (C) 2000 Blacksmith, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see http://www.gnu.org
*/
package net.wotonomy.web;
/**
* An implementation of WORequestHandler that dispatches Component actions.
*
* @author michael@mpowers.net
* @author $Author: cgruber $
* @version $Revision: 905 $
*/
public class WOComponentRequestHandler
extends WORequestHandler
{
public WOResponse handleRequest( WORequest aRequest )
{
WOApplication application = aRequest.application();
WOContext context = WOContext.contextWithRequest( aRequest );
WOResponse response = null;
// no concurrent access is allowed to a user's session:
// a user/browser/machine with multiple requests will have to wait
synchronized ( aRequest.request.getSession() )
{
try
{
application.awake();
WOSession session = null;
/*
// the NeXT way
String sessionID = aRequest.sessionID();
if ( sessionID != null )
{
session = application.restoreSessionWithID( sessionID, context );
if ( session == null )
{
response = application.handleSessionRestorationErrorInContext( context );
}
}
else
{
session = application.createSessionForRequest( aRequest );
if ( session == null )
{
response = application.handleSessionCreationErrorInContext( context );
}
else
{
session.setContext( context );
}
}
*/
// the servlet way
String sessionID = aRequest.sessionID();
if ( sessionID != null )
{
session = application.restoreSessionWithID( sessionID, context );
}
if ( session == null )
{
session = application.createSessionForRequest( aRequest );
if ( session == null )
{
response = application.handleSessionCreationErrorInContext( context );
}
else
{
session.setContext( context );
}
}
context.setSession( session );
session.awake();
if ( response == null )
{
WOComponent page;
String contextID = aRequest.contextID();
if ( contextID != null )
{
page = session.restorePageForContextID( contextID );
}
else
{
page = application.pageWithName( aRequest.pageName(), context );
}
if ( page == null )
{
//FIXME: should we call this a restoration error, or do we
// allow a bookmark with an expired context id to resume gracefully?
page = application.pageWithName( aRequest.pageName(), context );
//!response = application.handlePageRestorationErrorInContext( context );
}
//!else
{
context.pushElement( page ); //? needed?
page.ensureAwakeInContext( context ); //? shouldn't this be in WOApplication?
// only take values from request if there are values in the request
System.out.println("should I takeValuesFromRequest ? " + ( aRequest.formValueKeys().count() > 0 ));
if ( aRequest.formValueKeys().count() > 0 )
{
application.takeValuesFromRequest( aRequest, context );
}
// only invoke action if there is a sender id to invoke
WOActionResults result;
System.out.println("senderID: " + aRequest.senderID());
if ( aRequest.senderID() != null )
{
result = application.invokeAction( aRequest, context );
}
else
{
result = null;
}
if ( result == null || result == page ) // same page is returned
{
result = page;
// generate response
response = new WOResponse();
application.appendToResponse( response, context );
page.sleep();
}
else // different page is returned
if ( result instanceof WOComponent )
{
page.sleep();
page = (WOComponent) result;
page.ensureAwakeInContext( context );
context.popElement(); // removes page
context.pushElement( page );
// generate response
response = new WOResponse();
application.appendToResponse( response, context );
page.sleep();
}
else // WOResponse was returnd
{
response = (WOResponse) result;
}
context.popElement();
session.sleep();
session.savePage( page );
session.setContext( null );
application.saveSessionForContext( context );
}
}
}
catch ( Throwable t )
{
response = application.handleException( t, context );
}
application.sleep();
}
return response;
}
}
/*
* $Log$
* Revision 1.2 2006/02/19 01:44:02 cgruber
* Add xmlrpc files
* Remove jclark and replace with dom4j and javax.xml.sax stuff
* Re-work dependencies and imports so it all compiles.
*
* Revision 1.1 2006/02/16 13:22:22 cgruber
* Check in all sources in eclipse-friendly maven-enabled packages.
*
* Revision 1.8 2003/08/07 00:15:15 chochos
* general cleanup (mostly removing unused imports)
*
* Revision 1.7 2003/01/17 20:34:57 mpowers
* Better handling for components and parents in the context's element stack.
*
* Revision 1.6 2003/01/15 19:50:49 mpowers
* Fixed issues with WOSession and Serializable.
* Can now persist sessions between classloaders (hot swap of class impls).
*
* Revision 1.4 2003/01/14 15:51:09 mpowers
* No longer calling takeValues or invokeAction if there are no request params
*
* Revision 1.3 2003/01/13 22:24:34 mpowers
* Request-response cycle is working with session and page persistence.
*
* Revision 1.1 2003/01/09 16:13:59 mpowers
* Implemented WOComponentRequestHandler:
* Bringing the request-response cycle more into conformance.
*
* Revision 1.2 2002/12/17 14:57:44 mpowers
* Minor corrections to WORequests's parsing, and updated javadocs.
*
* Revision 1.1.1.1 2000/12/21 15:53:19 mpowers
* Contributing wotonomy.
*
* Revision 1.2 2000/12/20 16:25:50 michael
* Added log to all files.
*
*
*/
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