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Java Source Code / Java Documentation » Content Management System » apache lenya 2.0 » org.apache.cocoon.portal.event

Source Cross Reference Class Diagram Java Document (Java Doc)

org.apache.cocoon.portal.event .EventManager

All known Subclasses:   org.apache.cocoon.portal.event.impl .DefaultEventManager,
EventManager
public interface EventManager extends Component(Code)
This component manages the event handling mechanism in the portal. The event mechanism is based on the publisher/subscriber principle. An interested component (a org.apache.cocoon.portal.event.Receiver can subscribe itself for a specific class (or classes) of events. All Events have a common ancestor type Event and the event types are identified by a (sub)class The old design which is now deprecated 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.
author:
   Carsten Ziegeler
author:
   Volker Schmitt
author:
   Mauro Talevi
version:
   CVS $Id: EventManager.java 433543 2006-08-22 06:22:54Z crossley $

Field Summary
String ROLE


Method Summary
Publisher getPublisher()
     Returns the Publisher with which events can be published.
Register getRegister()
     Returns the Register with which subscribers can subscribe and unsubscribe interest to given Events.
void processEvents()

void send(Event event)
     Publish an event.
void subscribe(Receiver receiver)
     Subscribes a receiver for a specific type of event.
void unsubscribe(Receiver receiver)
     Unsubscribes a receiver for all events.

Field Detail
ROLE
String ROLE(Code)
Represents the role of the service

Method Detail
getPublisher
Publisher getPublisher()(Code)
Returns the Publisher with which events can be published. EventManager.send(Event)

getRegister
Register getRegister()(Code)
Returns the Register with which subscribers can subscribe and unsubscribe interest to given Events. EventManager.subscribe(Receiver)EventManager.unsubscribe(Receiver)

processEvents
void processEvents() throws ProcessingException(Code)
Process the events

send
void send(Event event)(Code)
Publish an event. All registered receivers get notified.
Parameters:
  event - The event to broadcast.

subscribe
void subscribe(Receiver receiver)(Code)
Subscribes a receiver for a specific type of event.

unsubscribe
void unsubscribe(Receiver receiver)(Code)
Unsubscribes a receiver for all events.

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