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Interface for observing when an event expression needs to Start (by adding the first listener). The publishing event expression supplies the callback used for indicating matches. The implementation supplies as a return value the callback to use to Stop the event expression.

The following tables list the members exposed by the PatternStarter type.

Public Methods

  NameDescription
Start
An event expression was Started and supplies the callback to use when matching events appear. Returns the callback to use to Stop the event expression.