Package org.bedework.util.jms

Class NotificationsHandler

java.lang.Object

org.bedework.util.jms.NotificationsHandler

Direct Known Subclasses:

JmsNotificationsHandlerImpl

public abstract class NotificationsHandler
extends Object

Handler which may be called to notify the system that something changed.

Some implementations may be able to call immediately changes take effect, for example the bedework hibernate implementation can call at the point a calendar is changed. Others may have to poll to determine if something has changed.

Author:

Mike Douglass

Constructor Summary

Constructors

Constructor	Description
NotificationsHandler()

Method Summary

Modifier and Type	Method	Description
abstract void	post(SysEvent ev)	Called to notify container that an event occurred.
abstract void	registerListener(SysEventListener l, boolean persistent)	Register a listener.
abstract void	removeListener(SysEventListener l)	Remove a listener.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

NotificationsHandler

public NotificationsHandler()

Method Details

post

public abstract void post(SysEvent ev)
                   throws NotificationException

Called to notify container that an event occurred.

Parameters:

ev - the event

Throws:

NotificationException - on fatal error

registerListener

public abstract void registerListener(SysEventListener l,
 boolean persistent)
                               throws NotificationException

Register a listener.

Parameters:

l - the listener

persistent - true if this listener is to be stored in the database and reregistered at each system startup.

Throws:

NotificationException - on fatal error

removeListener

public abstract void removeListener(SysEventListener l)
                             throws NotificationException

Remove a listener. If persistent it will be deleted from the database.

Parameters:

l - the listener

Throws:

NotificationException - on fatal error