With this
architecture however, there are still several drawbacks. The central hub can quickly
become a bottleneck, and because of the hub-and-spoke architecture, any problems
at the hub are rapidly manifested at all the clients.
Chapter 3
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Enterprise Service Bus
To help solve this problem, leading companies in the integration community
(led by Sun Microsystems) proposed the Java Business Integration Specification
Request (JSR 208) (Full details of the JSR can be found at http://jcp.org/en/jsr/
detail?id=208). JSR 208 proposed a standard framework for business integration
by providing a standard set of service provider interfaces (SPIs) to help alleviate the
problems experienced with Enterprise Application Integration.
The standard framework described in JSR 208 allows pluggable components to be
added into a standard architecture and provides a standard common mechanism for
each of these components to communicate with each other based upon WSDL. The
pluggable nature of the framework described by JSR 208 is depicted in the following
figure. It shows us the concept of an Enterprise Service Bus and introduces us to the
Service Engine (SE) component:
JSR 208 describes a service engine as a component, which provides business
logic and transformation services to other components, as well as consuming
such services.
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