Rules and Rule Functions : Event Preprocessors

Event Preprocessors
Event preprocessors are rule functions with one argument of type simple event. They perform tasks after an incoming message is transformed into a simple event but before it is asserted into the Rete network.
An event preprocessor is assigned to a destination and acts on all events arriving at that destination.
See Event Preprocessors in TIBCO BusinessEvents Architect’s Guide important information on the use of preprocessors.
If an event preprocessor fails due to an exception, the Retry on Exception field setting on the event type determines subsequent behavior (see Simple Event Reference).
Loading Cache Only Entities  If you are using the Cache Only cache mode for any entities, it is recommended that you load the relevant entities in the event preprocessor. See Guidelines for Use of Cache Related Functions.
Configuring an Event Preprocessor
To configure a preprocessor you associate the desired rule function with a destination. This configuration is done using the Cluster Definition Descriptor editor. See Chapter 3, CDD Configuration Procedures, Collections Tab — Destinations Settings and Properties, in TIBCO BusinessEvents Administration.