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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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