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13.19. @watch Example
This is the @watch annotation in a rule's LHS:
// listens for changes on both firstName (inferred) and lastName
Person( firstName == $expectedFirstName ) @watch( lastName )
// listens for all the properties of the Person bean
Person( firstName == $expectedFirstName ) @watch( * )
// listens for changes on lastName and explicitly exclude firstName
Person( firstName == $expectedFirstName ) @watch( lastName, !firstName )
// listens for changes on all the properties except the age one
Person( firstName == $expectedFirstName ) @watch( *, !age )Note
Since doesn't make sense to use this annotation on a pattern using a type not annotated with @PropertyReactive the rule compiler will raise a compilation error if you try to do so. Also the duplicated usage of the same property in @watch (for example like in: @watch( firstName, ! firstName ) ) will end up in a compilation error.
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