Package org.axonframework.eventhandling

Interface EventTrackerStatusChangeListener

public interface EventTrackerStatusChangeListener

Represent a listener that is notified whenever the Map of EventTrackerStatus' in the TrackingEventProcessor this component is registered to has changed.

Since:

4.4

Author:

Steven van Beelen

Method Summary

Modifier and Type	Method	Description
static EventTrackerStatusChangeListener	noOp()	Returns a no-op implementation of the EventTrackerStatusChangeListener.
void	onEventTrackerStatusChange(Map<Integer,EventTrackerStatus> updatedTrackerStatus)	Notification that an EventTrackerStatus has changed.
default boolean	validatePositions()	Flag dictating whether an EventTrackerStatus's positions (e.g.

Method Details

onEventTrackerStatusChange

void onEventTrackerStatusChange(Map<Integer,EventTrackerStatus> updatedTrackerStatus)

Notification that an EventTrackerStatus has changed. Implementations should take into account that this listener may be called concurrently, and that multiple invocations do not necessarily reflect the order in which changes have occurred. If this order is important to the implementation, it should verify the Segment and the status' positions of the given updatedTrackerStatus through the EventTrackerStatus.getSegment() and EventTrackerStatus.getCurrentPosition() methods respectively.

Parameters:

updatedTrackerStatus - the updated EventTrackerStatus to react on

validatePositions

default boolean validatePositions()

Flag dictating whether an EventTrackerStatus's positions (e.g. EventTrackerStatus.getCurrentPosition()) should be taken into account as a change to listen for. Defaults to false, as positions typically change a lot in a running system.

Returns:

true if positions should be validated, false otherwise.

noOp

static EventTrackerStatusChangeListener noOp()

Returns a no-op implementation of the EventTrackerStatusChangeListener.

Returns:

a no-op implementation of the EventTrackerStatusChangeListener