Messaging

Software-to-software messaging is another model of how software communicates with each other. In this model, a messaging middleware stands in the middle of a sender and a receiver to enable the reliable exchange of messages even if one of the two parties is out of service. Moreover, this model enables the application of scaling techniques such as load balancing and message broadcasting to subscribed components.

In this book, we'll learn the basic principles of messaging and how the JMS API provides a comprehensive framework to build a full-featured messaging system to realize the described messaging model. We'll also learn the difference between the two messaging models—Point-to-Point (P2P) and the Publish-Subscribe model—and how to implement both of them, with examples, using the JMS API.