Different applications will not communicate directly
with each other for integration; instead they communicate through this middleware
Service Oriented Architecture (SOA) backbone. The most distinguishing feature of
the ESB architecture is the distributed nature of the integration topology. Most ESB
solutions are based on Web Services Description Language (WSDL) technologies,
and they use Extensible Markup Language (XML) formats for message translation
and transformation.
ESB is a collection of middleware services which provides integration capabilities.
These middleware services sit in the heart of the ESB architecture upon which
applications place messages to be routed and transformed. Similar to the
hub-and-spoke architecture, in ESB architecture too, applications connect to the ESB
through abstract, intelligent connectors. Connectors are abstract in the sense that
they only define the transport binding protocols and service interface, not the real
implementation details. They are intelligent because they have logic built-in along with
the ESB to selectively bind to services at run time.
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