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When you enable inbound callback event notification, business processes are
alerted to changes in, or new information about, an EIS. The phrase callback refers
to the ability of the EIS system to directly notify the adapter or business processes
of a change, as opposed to the polling mechanism used in event notification.
Callback event notification complements outbound request processing, enabling
adapters to provide bidirectional communication between business processes and
EIS applications.
Generally, in a callback scenario, the adapter will need to setup event listeners to
receive callback events from the EIS. Callback event processing could be either
synchronous (REQUEST-RESPONSE) or asynchronous (ONE-WAY).
Request and response callback events
A request and response callback event is a synchronous operation in which the EIS
sends a callback call to the adapter and waits for the adapter to respond to the call.
Since the EIS expects a response from the adapter, event delivery to multiple
endpoints cannot be supported.
The following is an illustration of synchronous callback event processing.
EIS
Adapter
Callback
From EIS
Request
Endpoint
/
Application
Response
Response
One way callback events
One way callback events are asynchronous operations in which the EIS sends an
event to the adapter and then goes on with its processing, not waiting for the
adapter to send a response back.
The following is an illustration of asynchronous callback event processing.
EIS
Adapter
Callback
From EIS
Message
Delivery
Endpoint
/
Application
Response
Response
90 WebSphere Adapters: WebSphere Adapter Toolkit User Guide