Listeners

Listener elements are used for tracking changes in states manager by a runner.

A state listener can trigger actions before or after aggregate updates and/or full state reloads. A number of settings are shared across all listeners:

Setting	Definition	Example	Default
priority	A numeric value for prioritizing listener triggers (higher priority called first)	10	0

In addition to developing customized state listeners, it is possible to use them programmatically for building handlers responsive to state data changes.