Service-Oriented Architecture is discussed quite a bit in this book. However, SOA is no more than a design methodology for combining loosely coupled systems into a unified, services-based infrastructure. For the most part, all that it can provide are best practices around decomposing services, organizing middleware, providing good governance, etc. It is an idea (a very good idea, but still just an idea) about how systems should communicate. To make the promise of SOA a reality, specific technologies are still needed to implement SOA systems. Specific technologies to implement middleware systems are needed as well as specific technologies to wrap and expose end systems as encapsulated services with published interfaces. In this ...

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