Preprocessor Use Guidelines
Keep in mind several guidelines for using prepropcessors.
- Consuming events in a preprocessor is allowed
- It can be useful in some applications and reduces the flow of messages into the Rete network. Such events are acknowledged immediately (if they require acknowledgement).
- You can only modify events before they are asserted into the Rete network
- Rule evaluation depends on event values at time of assertion, so values can be changed only before assertion, that is, in the preprocessor.
- You can create concepts but not modify existing concepts
- Modifying concepts that already exist in the system could disrupt an RTC. You can modify concepts that were created in the same preprocessor, however.
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