Component
org.nuxeo.ecm.core.listener.CoreEventListenerService

listener

Extension point for registering event listeners.


An event listener has the following properties:

- name: identifier for this listener. It must be unique within the
application.

- class: the class to use for this event listener, see below for
implementation requirements.

- order: the order in which the listener will be notified of an event.
This may be useful if different listeners have to react in a specified
order. If no order is given, order 0 is assumed. Negative orders are
accepted. Listeners can share the same order, but the notification order
will not be reliable.

- eventId: event ids this listener processes. Multiple values can be
defined. If no eventId attributes are defined, the listener is notified
for all events. It is then responsible for filtering events it has to
process in its notifyEvent method.



Event listeners must implement the
org.nuxeo.ecm.core.listener.EventListener interface and will be notified
on each call back : public void notifyEvent(CoreEvent coreEvent); Core
Event listeners are synchronous. Thus they should be implemented to
rather perform non time consuming heavy computing that would decrease
core txn performances.



Nuxeo core defines a default set of event ids that are defined in :
org.nuxeo.ecm.core.api.event.DocumentEventTypes. Though, you can extend
them and define your own event ids and listeners reacting on them.

• Object org.nuxeo.ecm.core.listener.extensions.CoreEventListenerDescriptor