The need to aggregate
or combine small services into larger services is core to a service
oriented architecture. In many cases, a single service will act
as a front-end to many small services. There are a variety of
methods for combining services, including:
- Pipe and Filters – Direct the output
of one service into the input of another service. (Topology
= point-to-point)
- Orchestrations
– Utilize a high-level scripting language to control the
sequence and flow of service execution. (Topology = hub
& spoke)
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Each service composition
mechanism will utilize a variety of message
exchange patterns and provide its own message
correlation facility.
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