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From Guido Casper <gcas...@s-und-n.de>
Subject Portal: ApplicationCopletAdapter and persistent links
Date Mon, 21 Jan 2008 12:24:22 GMT
Hi all,

I am trying to implement persistent links within an application coplet 
of the portal. By default the internal links of external applications 
are dynamically converted to "?cocoon-portal-event=xx" parameters at 
runtime. So a particular page of an external application is not easily 
bookmarkable or to be incorporated in search results, etc. So to have a 
search crawler be able to index these pages, these links have to be 
globally valid, identifyable and have to survive Tomcat restarts. In 
short, they have to be persistent.

I found it would be easiest to base the implementation on the 
PageLabelEventConverter.

As a test I tried to manually create a CopletLinkEvent within the start 
Method (initialize() wouldn't work because this code accesses the 
ProfileManager) to simulate recreating these Links from a persistent store:

public void start() {
     String label = this.labelManager.setCurrentLabel();
     try {
         PortalService portalService = 
(PortalService)this.manager.lookup(PortalService.ROLE);
         PortalComponentManager componentManager = 
portalService.getComponentManager();
         ProfileManager profileManager = 
componentManager.getProfileManager();
         if (this.eventList.size() == 0) {
             CopletInstanceData cid = 
profileManager.getCopletInstanceData( "Google-1" );
             if (cid != null) {
                 cid.setAttribute("cookie", null);
                 cid.setAttribute("documentbase", "http://www.google.de/");
                 Event persistentEevent = new CopletLinkEvent(cid, 
"/intl/de/about.html");
                 this.eventList.add(persistentEevent);
             }
         }
     } catch (ServiceException se) {
         this.getLogger().error("Error getting " + PortalService.ROLE + 
": ", se);
     }
}

The event gets correctly endoded into the pages. Even decoding seems to 
work correctly, however clicking this link simply reloads the current page.

Any idea what might go wrong is much appreciated. The complete Code of 
PageLabelPersistentEventConverter is below.

Thanks
Guido

-- 
Freundliche Grüße / With kind regards
Guido Casper

S&N AG
Klingenderstr. 5
D 33100 Paderborn

voice  +49 5251/1581-87
fax    +49 5251/1581-71
eMail  gcasper@s-und-n.de
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Handelsregister
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-------------------------------------------

package org.apache.cocoon.portal.event.impl;

import java.util.List;
import java.util.ArrayList;

import org.apache.avalon.framework.logger.AbstractLogEnabled;
import org.apache.avalon.framework.service.Serviceable;
import org.apache.avalon.framework.service.ServiceException;
import org.apache.avalon.framework.service.ServiceManager;
import org.apache.avalon.framework.thread.ThreadSafe;
import org.apache.cocoon.portal.PortalComponentManager;
import org.apache.cocoon.portal.PortalService;
import org.apache.cocoon.portal.profile.ProfileManager;
import org.apache.cocoon.portal.coplet.CopletBaseData;
import org.apache.cocoon.portal.coplet.CopletData;
import org.apache.cocoon.portal.coplet.CopletFactory;
import org.apache.cocoon.portal.coplet.CopletInstanceData;
import org.apache.cocoon.portal.event.Event;
import org.apache.cocoon.portal.event.EventConverter;
import org.apache.cocoon.portal.impl.PageLabelManager;

public class PageLabelPersistentEventConverter extends AbstractLogEnabled
     implements EventConverter, Serviceable, ThreadSafe {

     protected PageLabelManager labelManager;

     protected ServiceManager manager;

     protected List eventList = new ArrayList();

     public void service(ServiceManager manager) throws ServiceException {
         this.manager = manager;
         this.labelManager = 
(PageLabelManager)manager.lookup(PageLabelManager.ROLE);
     }

     public String encode(Event event) {
         int index = this.eventList.indexOf(event);
         if ( index == -1 ) {
             this.eventList.add(event);
           index = this.eventList.size() - 1;
         }
         return String.valueOf(index);
     }

     public Event decode(String value) {

         if ( null != this.eventList ) {
             int index = new Integer(value).intValue();
             if (index < this.eventList.size()) {
                 this.getLogger().info("decoded");
                 Event event = (Event)this.eventList.get(index);
                 return event;
             }
         }
         return null;
     }

     public void start() {
         String label = this.labelManager.setCurrentLabel();
         try {
             PortalService portalService = 
(PortalService)this.manager.lookup(PortalService.ROLE);
             PortalComponentManager componentManager = 
portalService.getComponentManager();
             ProfileManager profileManager = 
componentManager.getProfileManager();
             if (this.eventList.size() == 0) {
                 CopletInstanceData cid = 
profileManager.getCopletInstanceData( "Google-1" );
                 if (cid != null) {
                     System.out.println("CopletInstanceData found");
                     cid.setAttribute("cookie", null);
                     cid.setAttribute("documentbase", 
"http://www.google.de/");
                     Event persistentEevent = new CopletLinkEvent(cid, 
"/intl/de/about.html");
                     eventList.add(persistentEevent);
                 }

             }
         } catch (ServiceException se) {
             this.getLogger().error("Error getting " + 
PortalService.ROLE + ": ", se);
         }

     }

     public void finish() {
         // nothing to do
     }

     public boolean isMarshallEvents() {
         return this.labelManager.isMarshallEvents();
     }
}

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