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Adapters or ESB infrastructure can perform service routing to different providers. Directory (for example, UDDI) or broker intermediary to decide who fulfills the service each time. An ESB might identify a suitable service provider based on WS-Policy, for example by selecting the cheapest or most-responsive provider available at the time. Time Declared or Negotiated As IT systems show many differing planned and unplanned availability characteristics (such as 24/7 versus working hours), service interactions will sometimes have to span systems with different characteristics.

Version-based routing in the bus infrastructure. Service request / provider tolerance of changes in optional data attributes. Patterns: Implementing an SOA Using an Enterprise Service Bus Aspect SOA intention Interaction state Declared Techniques Matching of messages or events to long-lived processes by explict process or transaction IDs in semantic interface, or by application data (for example, customer ID). Service Choreography technology may provide some facility to use a variety of input data to associate messages with specific instances of processes.

In that vein, we should take stock briefly of what both Web services and SOA have achieved separately to date: Most significant SOAs are proprietary or customized implementations based on reliable messaging and Enterprise Application Integration middleware (for example WebSphere Business Integration) and do not use Web services technologies. They have, however, demonstrated the benefits of SOA, usually within a single enterprise. Most existing Web services implementations consist of point-to-point integrations that address a limited set of business functions between a defined set of cooperating partners, and they use HTTP (an unreliable transport) as the communication mechanism.

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