The federated application provides the customer bid requests and
status of bids that is required of the new merged Cottonwood Distributors
enterprise.
The customer bid requests are sent through the Web services. The actual
request is a message that is routed to a WebSphere® message queue. Cottonwood
Distributors has an application on that message queue that listens for activity
so that the programs can retrieve database requests from the queue as the
requests enter the queue. This listener application invokes a set of actions
to process the requests. The listener balances the load that is introduced
by the number of bid requests that enter the queue and processes the customer
bid requests with the following steps:
The customer bid Web services request writes a message to the queue.
The listener application invokes a Db2® function to extract
the order information from the request.
The application runs a read-only query to obtain a quote for the requested
part.
The application inserts a record into the local table to
record the order.
The following graphic displays the flow for the customer orders:Figure 1. Cottonwood customer order requests
