com.espertech.esper.pattern
Interface PatternStarter

All Known Implementing Classes:

EvalRootNode

public interface PatternStarter

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.

Method Summary

PatternStopCallback

start(PatternMatchCallback matchCallback, PatternContext context, boolean isRecoveringResilient) An event expression was started and supplies the callback to use when matching events appear.

Method Detail

start

PatternStopCallback start(PatternMatchCallback matchCallback,
                          PatternContext context,
                          boolean isRecoveringResilient)

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.

Parameters:

matchCallback - must be supplied to indicate what to call when the expression turns true

context - is the context for handles to services required for evaluation.

Returns:

a callback to stop the expression again