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public interface GraphEventManager
The component of a graph responsible for managing events and listeners. The interface extends GraphListener because most of the notificiations are the same; the special case to note is that an event manager expects to be handed iterator events as lists, not as iterators.
Method Summary | |
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boolean |
listening()
Answer true iff there is at least one attached listener. |
void |
notifyAddIterator(Graph g,
List<Triple> triples)
Notify all attached listeners that an iterator [of triples] has been added to the graph; its content has been captured in the list triples . |
void |
notifyDeleteIterator(Graph g,
List<Triple> triples)
Notify all attached listeners that an iterator [of triples] has been removed from the graph; its content has been captured in the list triples . |
GraphEventManager |
register(GraphListener listener)
Attached listener to this manager; notification events
sent to the manager are sent to all registered listeners. |
GraphEventManager |
unregister(GraphListener listener)
If listener is attached to this manager, detach it, otherwise
do nothing. |
Methods inherited from interface com.hp.hpl.jena.graph.GraphListener |
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notifyAddArray, notifyAddGraph, notifyAddIterator, notifyAddList, notifyAddTriple, notifyDeleteArray, notifyDeleteGraph, notifyDeleteIterator, notifyDeleteList, notifyDeleteTriple, notifyEvent |
Method Detail |
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GraphEventManager register(GraphListener listener)
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.
listener
- a listener to be fed events
GraphEventManager unregister(GraphListener listener)
listener
is attached to this manager, detach it, otherwise
do nothing. Only a single registration is removed.
listener
- the listener to be detached from the graph
boolean listening()
void notifyAddIterator(Graph g, List<Triple> triples)
triples
.
void notifyDeleteIterator(Graph g, List<Triple> triples)
triples
.
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