Following up on the series "SOA and Java" where we analyze the technologies available in the Java space to build service-oriented applications, let us look at the Service Layer among the different layers of Service Oriented Applications and also at the different approaches to built service layer, the-top down approach, bottom-up approach, meet-in-the middle approach.

Different Layers of Service oriented Applications.

Figure 2 provides a typical architecture for a service-oriented application. The two key tiers in SOA are the services layer and the business process layer.

The Service Layer

Services are the building blocks of service-oriented applications. They are also self-contained, maintain their own state, and provide a loosely coupled interface. A service is usually built by three approaches

1. The top-down Approach

2. The Bottom-up Approach

3. The Meet-in-the-middle Approach

In the top-down approach, the service is implemented after the messages and operations that are provided by the service have been identified and described. It is usually used when a completely new service is being built as it allows you to choose your preferred implementation technology(Process centric). On the other hand the bottom-up approach is preferred when we plan to reuse the existing investment in business components(Data centric). The third approach is the Meet-in-the-middle Approach is Application centric.

Next in this series is, Web Sevices Description Language

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