It then listens for
the response message on the service's reply queue. The provider application listens
for requests on the service's request queue, performs the service, and then sends (if)
any response to the service's reply queue.
We normally use vendor products like IBM's Websphere MQ (WMQ) and
Microsoft MQ (MSMQ), which are the best class message queue solution to integrate
applications in the message bus topology. As shown in the following figure,
sometimes the applications have to use adapter which handle scenarios such as
invoking CICS transactions. Such an adapter may provide connectivity between
the applications and the message bus using proprietary bus APIs, and application
APIs. The Message bus also requires a common command structure representing
the different possible operations on the bus. These command sets invoke bus-level
primitives which includes listening to an address, reading bytes from an address,
and writing bytes to an address.
Why Enterprise Service Bus
[ 16 ]
Enterprise Service Bus Integration
The service bus approach to integration makes use of technology stacks to provide a
bus for application integration.
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