In this section, we will take a look at a different messaging model called the publish/subscribe (Pub/Sub) messaging model.
In this type of model, a subscriber registers its interest in a particular topic or event and is subsequently notified about the event asynchronously. Subscribers have the ability to express their interest in an event, or a pattern of events, and are subsequently notified of any event generated by a publisher that matches their registered interest. These events are generated by publishers. It is different from the PTP messaging model in a way that a topic can have multiple receivers and every receiver receives a copy of each message. In other words, a message is broadcast to all receivers ...
