Apama 10.3 | Apama Documentation | Developing Apama Applications | Developing Apama Applications in EPL | Defining Event Listeners | Specifying and/or/not logic in event listeners | Specifying the 'or' operator in event expressions
Specifying the 'or' operator in event expressions
The or operator lets you specify event expressions where a variety of event patterns could lead to a successful match. It effectively evaluates two event templates (or entire nested event expressions) simultaneously and returns true when either of them becomes true.
For example,
on A() or B() executeAction();
means that either A or B need to be detected to match. That is, the occurrence of one of the operand expressions (an A or a B) is enough for the event listener to trigger.

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