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The Enterprise Service Bus (ESB)- which can be defined as middleware that brings together both integration technologies and runtime services to make business services widely available for reuse - offers the best solution for meeting today's enterprise application integration challenges by providing a software infrastructure that enables SOA. However, there are currently a number of different vendors that provide ESB solutions, some of which focus purely on SOAP/HTTP and others who provide multi-protocol capabilities. Because these vendors span the horizon from big enterprise generalists (app servers), to mid-tier enterprise integration providers, all the way to smaller, ESB/integration specific-providers - ; there doesn't seem to be an established consensus regarding the key requirements for an ESB.

As application architects, we have often thought about what requirements would define an ESB designed specifically to cater to the needs of an agile, enterprise integration model. In building for these specific requirements, we realized that we actually needed to develop a new type of ESB - , hence the ServiceMix project.

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