5. Composition
The last two chapters focused on the SCA programming model; in this chapter, we take a closer look at how applications are assembled using composites. Here we introduce another key concept, composition. In short, composition is the capability to build larger components and services from a series of smaller ones. The power of composition is that it provides a mechanism for more easily maintaining and evolving applications over time by making them more modular. With composition, sets of services encompassing various functional areas of an application can be more easily reused, upgraded, replaced, and changed. After working through this chapter, you will have a solid foundation in how composites are used to achieve a modular application ...
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