Inheritance diagram for cern.cmw.mom.pubsub.Subscriber:

Public Member Functions
void	setExceptionListener (ExceptionListener listener)
void	close ()
long	subscribe (String topic, SubscriptionListener listener, String selector) throws JMSException, NamingException
void	unSubscribe (long subscriptionToken) throws JMSException
void	unSubscribeAll () throws JMSException

Detailed Description

Public interface. Provide topic subscription facilities.

Two kinds of exception are thrown :

javax.jms.JMSException are thrown for exceptions caused by a problem in the underlying implementation.
javax.naming.NamingException are thrown if the topic usage is not correct. Each time a topic is used, either in publication or in subscription, the topic name is checked against a topic namespace, to avoid namespace pollution and performance degradation.

This example shows a simple subscription to a topic:

 try {
   s = PubSubFactory.subscriber();
 } catch (MOMException momEx) { ... }
 try {
   subToken = s.subscribe("CMW.DEVICES.PowerConverter.PC1.Current", listener, selector);
   // ...
   s.unSubscribe(subToken);
   s.close();
 }
 catch (JMSException jmsEx) { ... }
 catch (NamingException namingEx) { ... }
 </blockquote>

where listener is an instance of a class implementing the SubscriptionListener interface method void onMessage(Message m) and selector is an optional String defining a message selector.

See also:: Publisher; SubscriptionListener; PubSubFactory; NotificationHelper; cern.cmw.mom.mapping.MappingService

Version:: 1.0 23 Jan 2001

Author:: Controls Middleware Project

Member Function Documentation

void cern.cmw.mom.pubsub.Subscriber.close ( )

Close the publisher singleton instance and dealloacate any resource.

Referenced by cern.laser.source.alarmsysteminterface.impl.ASISubscriberProxy.close().

void cern.cmw.mom.pubsub.Subscriber.setExceptionListener ( ExceptionListener listener )

Set the listener for exceptions handling

Parameters:

listener

The exceptions listener

long cern.cmw.mom.pubsub.Subscriber.subscribe	(	String	topic,
		SubscriptionListener	listener,
		String	selector
	)			throws JMSException, NamingException

Subscribe to the given topic.

Parameters:

	topic	The String representation of the topic
	listener	An instance of a class implementing the SubscriptionListener interface
	selector	The String representation of the filter. May be null.