Executive Summary (This is a document excerpt)

An enterprise service bus (ESB) is software infrastructure that enables service-oriented architecture (SOA) by acting as an intermediary layer of middleware through which a set of reusable business services are made widely available. An ESB helps enterprises obtain the value of SOA by increasing connectivity, adding flexibility that speeds change, and providing greater control over use of the important resources it binds. The wide range of mediation services that can be provided by an ESB fit into a broader architecture pattern, which may be partly or wholly implemented, depending on the breadth of actual requirements. Any enterprise looking to implement SOA should evaluate what form of ESB would be required, and begin to take the initial steps to exploit this key emerging technology.

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