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.cocoon.portal.PortalManager#process()
     */
    public void process()
    throws ProcessingException {
        EventManager eventManager = null;
        try {
            eventManager = (EventManager)this.manager.lookup(EventManager.ROLE);
            eventManager.processEvents();
        } catch (ServiceException ce) {
            throw new ProcessingException("Unable to lookup portal service.", ce);
        } 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.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) {
                // let's ignore it
            } finally {
                this.manager.release(eventManager);
            }

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        } finally {
            this.manager.release(service);
        }
        if ( instances != null ) {
            Publisher publisher = null;
            EventManager eventManager = null;
            try {
                eventManager = (EventManager) this.manager.lookup(EventManager.ROLE);
                publisher = eventManager.getPublisher();
            } catch (Exception ignore) {
                // ignore exception
            } 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) {
                // 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.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) {
                // ignore this here
            } 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) {
                // ignore
            } finally {
                this.manager.release( eventManager ); 
            }

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