MOM has been serving as a great enabler for creating loosely coupled applications for many years. Now MOM provides us the EAI pattern to integrate not only applications but also services and components in a seamless manner.

Distributed components are the norm in today's enterprise computing, aggregating, and orchestrating the message flows across such multiple components provide us with a new flexibility in defining business process—by separating out individual services into multiple components and thus reducing the overall complexity of the process.

We use the "divide and rule" principle to manage the complexity by splitting out the functionality into multiple components and services. However, then these distributed components have to integrate together to provide aggregate or composite services which we can do at the ESB-level. You have seen such a sample in this chapter.

In the next chapter we will look at the JBI bus in a slightly different perspective—in a non-functional or a QOS...