Examples of org.apache.cocoon.portal.event.EventManager

org.apache.cocoon.portal.event.EventManager

Service to manage event notification. The designed has been inspired by the paper by Gupta, S., J. M. Hartkopf, and S. Ramaswamy, in Java Report, Vol. 3, No. 7, July 1998, 19-36, "Event Notifier: A Pattern for Event Notification".

EventManager brokers events between a Publisher, which produces events, and a Subscriber, which handles the notification of events. A Filter discards events not of interest to a subscriber. All Events have a common ancestor type Event and the event types are identified by a Class.
@author Carsten Ziegeler @author Volker Schmitt @author Mauro Talevi @version CVS $Id: EventManager.java 30932 2004-07-29 17:35:38Z vgritsenko $


    /* (non-Javadoc)
     * @see org.apache.avalon.framework.activity.Initializable#initialize()
     */
    public void initialize() throws Exception {
        EventManager eventManager = null;
        try {
            eventManager = (EventManager) this.manager.lookup(EventManager.ROLE);
            eventManager.getRegister().subscribe(this);
        } finally {
            this.manager.release(eventManager);
        }
    }

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        }
    }


    public void dispose() {
        if (this.manager != null) {
            EventManager eventManager = null;
            try {
                eventManager = (EventManager) this.manager.lookup(EventManager.ROLE);
                eventManager.getRegister().unsubscribe(this);
            } catch (Exception ignore) {
            } finally {
                this.manager.release(eventManager);
            }
        }

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    /* (non-Javadoc)
     * @see org.apache.avalon.framework.activity.Initializable#initialize()
     */
    public void initialize() throws Exception {
        EventManager eventManager = null;
        try {
            eventManager = (EventManager)this.manager.lookup( EventManager.ROLE);
            eventManager.getRegister().subscribe( this );
        } finally {
            this.manager.release(eventManager);
        }


    }

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    /* (non-Javadoc)
     * @see org.apache.avalon.framework.activity.Disposable#dispose()
     */
    public void dispose() {
        if ( this.manager != null ) {
            EventManager eventManager = null;
            try { 
                eventManager = (EventManager)this.manager.lookup(EventManager.ROLE);
                eventManager.getRegister().unsubscribe( this );
            } catch (Exception ignore) {
            } finally {
                this.manager.release( eventManager ); 
            }

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    /* (non-Javadoc)
     * @see org.apache.avalon.framework.activity.Initializable#initialize()
     */
    public void initialize() throws Exception {
        EventManager eventManager = null;
        try { 
            eventManager = (EventManager)this.manager.lookup(EventManager.ROLE);
            eventManager.getRegister().subscribe( this );
        } finally {
            this.manager.release( eventManager );
        }
    }

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    /* (non-Javadoc)
     * @see org.apache.avalon.framework.service.Serviceable#service(org.apache.avalon.framework.service.ServiceManager)
     */
    public void service(ServiceManager manager) throws ServiceException {
        super.service(manager);
        EventManager eventManager = null;
        try {
            eventManager = (EventManager)this.manager.lookup(EventManager.ROLE);
            eventManager.getRegister().subscribe(this);
        } finally {
            this.manager.release(eventManager);
        }
    }

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    /* (non-Javadoc)
     * @see org.apache.avalon.framework.activity.Initializable#initialize()
     */
    public void initialize() 
    throws Exception {
        EventManager eventManager = null;
        try {
            eventManager = (EventManager) this.manager.lookup( EventManager.ROLE );
            eventManager.getRegister().subscribe( this );
        } finally {
            this.manager.release( eventManager );
        }
    }

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        }
    }


    public void dispose() {
        if ( this.manager != null ) {
            EventManager eventManager = null;
            try {
                eventManager = (EventManager) this.manager.lookup( EventManager.ROLE );
                eventManager.getRegister().unsubscribe( this );
            } catch (Exception ignore) {
            } finally {
                this.manager.release( eventManager );
            }
        }

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  /**
   * @see org.apache.cocoon.portal.event.aspect.EventAspect#process(org.apache.cocoon.portal.event.aspect.EventAspectContext, org.apache.cocoon.portal.PortalService)
   */
  public void process(EventAspectContext context, PortalService service) {
        if (this.labelManager != null) {
            final EventManager publisher = service.getComponentManager().getEventManager();
            final Request request = ObjectModelHelper.getRequest(context.getObjectModel());
            final String parameterName = this.labelManager.getRequestParameterName();
            final boolean useUrlPath = this.labelManager.isUrlPath();


            String label = (useUrlPath) ? request.getSitemapURI() : request.getParameter(parameterName);


            // The pageLabel must be single valued
            if (label != null) {
                String previous = this.labelManager.getPreviousLabel();
                if (previous != null && previous.equals(label) ) {
                    // Already on this page. Don't publish the pageLabel events
                } else {
                    Iterator iter = this.labelManager.getPageLabelEvents(label).iterator();
                    // Publish all the events for this page label.
                    while (iter.hasNext()) {
                        Event event = (Event) iter.next();
                        publisher.send(event);
                    }
            //        return;
                }
            }
        }

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            // parameter name is path
            // parameter value is value
            // if the value is null or empty, the value is not set!
            final String[] names = parameters.getNames();
            if ( names != null ) {
                final EventManager publisher = portalService.getComponentManager().getEventManager();
                for(int i=0; i<names.length; i++) {
                    final String path = names[i];
                    final String value = parameters.getParameter(path, null );
                    if ( value != null && value.trim().length() > 0 ) {
                        final Event event = new CopletJXPathEvent(portalService.getComponentManager().getProfileManager().getCopletInstanceData(copletId),
                                path,
                                value);
                        publisher.send(event);
                    }
                }
            }
            
            return EMPTY_MAP;

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