ESB, Messaging and Adapter Solutions
An ESB generally provides an abstraction layer on top of an implementation of an enterprise messaging system, which allows integration architects to exploit the value of messaging without writing code. Unlike the more classical enterprise application integration (EAI) approach of a monolithic stack in a hub and spoke architecture, an enterprise service bus builds on base functions broken up into their constituent parts, with distributed deployment where needed, working in harmony as necessary.
Messaging is the heart of ESB and integration. There are many approaches for messaging including application-specific APIs and RPCs, legacy technologies such as COM and CORBA, and more recent standards like Java EE and Web services as well as some proprietary messaging tools such as WebSphere MQ, Oracle AQ etc A critical requirement for the SOA is to bridge the "last mile" and connect to existing assets to leverage them in your services. Adapters provide an easy-to-use, robust solution for connecting to all your corporate assets, including packaged applications, custom applications, databases, and other technologies.
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