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Observer pattern + JMS Pub-Sub

 
kri shan
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Pub-Sub implements Observer pattern.Per my understanding Publisher is Subject and Subscribers are Observers. So publishers state change will be notified to Observers whenever there is a state change.

Do I need to implement any interface method for sending the message in the Subject (TopicPublisher) ?

Which is the right approach to implement the Observer (TopicSubscriber)?
Observer Class implements MessageListener's onMessage(message) (or) Observer Class implements NotificationListener's handleNotification(notification, callback)/
 
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