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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            if ( parent != null && parent.getParent() != null) {
                parent.getParent().removeItem( parent );
            }
            
            PortalService service = null;
            EventManager eventManager = null;
            try {
                service = (PortalService)this.manager.lookup(PortalService.ROLE);                
                ProfileManager profileManager = service.getComponentManager().getProfileManager();
                if ( layout instanceof CopletLayout ) {
                    // full screen?
                    if ( layout.equals(service.getEntryLayout(null)) ) {
                        Event event = new FullScreenCopletEvent(((CopletLayout)layout).getCopletInstanceData(), null);
                        eventManager = (EventManager)this.manager.lookup(EventManager.ROLE);
                        eventManager.getPublisher().publish(event);
                        service.getComponentManager().getLinkService().addEventToLink(event);
                    }
                    CopletFactory factory = service.getComponentManager().getCopletFactory();
                    factory.remove( ((CopletLayout)layout).getCopletInstanceData());
                }

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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 process(EventAspectContext context, PortalService service) {
        final Request request = ObjectModelHelper.getRequest(context.getObjectModel());
        String[] values = request.getParameterValues(this.getRequestParameterName());
        if (values != null) {
            final EventManager publisher = service.getComponentManager().getEventManager();
            for (int i = 0; i < values.length; i++) {
                // first try to make an event out of the value of the parameter
                final String value = values[i];
                Event e = null;
                try {
                    e = context.getEventConverter().decode(value);
                    if (null != e) {
                        publisher.send(e);
                    }
                } catch (Exception ignore) {
                    // ignroe it
                }
                // the event could not be generated, so try different approach

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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.unsubscribe( this );
            } catch (Exception ignore) {
                // 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.subscribe( this );
        } finally {
            this.manager.release( eventManager );
        }
    }

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            if ( parent != null && parent.getParent() != null) {
                parent.getParent().removeItem( parent );
            }
            
            PortalService service = null;
            EventManager eventManager = null;
            try {
                service = (PortalService)this.manager.lookup(PortalService.ROLE);                
                ProfileManager profileManager = service.getComponentManager().getProfileManager();
                if ( layout instanceof CopletLayout ) {
                    // full screen?
                    if ( layout.equals(service.getEntryLayout(null)) ) {
                        Event event = new FullScreenCopletEvent(((CopletLayout)layout).getCopletInstanceData(), null);
                        eventManager = (EventManager)this.manager.lookup(EventManager.ROLE);
                        eventManager.send(event);
                        service.getComponentManager().getLinkService().addEventToLink(event);
                    }
                    CopletFactory factory = service.getComponentManager().getCopletFactory();
                    factory.remove( ((CopletLayout)layout).getCopletInstanceData());
                }

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

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        ProfileManager profileManager = service.getComponentManager().getProfileManager();
        instances = profileManager.getCopletInstanceData(data);


        if ( instances != null && e instanceof ChangeCopletsJXPathEvent ) {
            EventManager eventManager = service.getComponentManager().getEventManager();
            final String path = ((ChangeCopletsJXPathEvent)e).getPath();
            final Object value = ((ChangeCopletsJXPathEvent)e).getValue();
                    
            Iterator i = instances.iterator();
            while ( i.hasNext() ) {
                CopletInstanceData current = (CopletInstanceData) i.next();
                Event event = new CopletJXPathEvent(current, path, value);
                eventManager.send(event);
            }
        }
    }

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            this.consumerEnvironment.getProducerRegistry().removeAllProducers();


            this.consumerEnvironment.getUserRegistry().removeAllUsers();
        }
        if ( this.manager != null ) {
            EventManager eventManager = null;
            try {
                eventManager = (EventManager)this.manager.lookup(EventManager.ROLE);
                eventManager.unsubscribe(this);
            } catch (Exception ignore) {
                // let's ignore it
            } finally {
                this.manager.release(eventManager);
            }

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