listener
to this manager; notification events sent to the manager are sent to all registered listeners. A listener may be registered multiple times, in which case it's called multiple times per event. A listener will be notified of an event if it is registered before the Graph method call that initiated the event, and was not unregistered before that method call returned. In addition, a listener may (or may not) be notified of an event if it is registered before such a method returns or is unregistered after such a method is called. For example, it may unregister itself in response to the event. If the registration and/or unregistration occur on different threads the usual thread uncertainties in such statements apply.
@param listener a listener to be fed events
@return this manager, for cascading
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