An event listener is a Java object that listens for Content Engine events and responds to them. Events in this context are messages that are broadcast by the Content Engine whenever certain things occur. An event is broadcast, for example, whenever an Escenic object is created or modified. You can use event listeners to extend and customize the Content Engine in various ways. You might, for example, create an event listener that listens for the creation of new content items and automatically exports the newly-created content items to an external system.
An Escenic event is an object of the class
object has a
type property that indicates what kind of
event it represents. An event generated when an object is created has a
OBJECT_CREATED, for example. An
IOEvent object also has a number of other properties
that are used to hold information about the event that has occurred. An
event listener can therefore interrogate an event for the information it
needs to respond to the event.