@Test
public void testGetEvents() {
Set<Class<? extends Event>> eventClasses = new HashSet<Class<? extends Event>>();
for (Event theEvent : listener.getEvents()) {
eventClasses.add(theEvent.getClass());
}
assertEquals(2, eventClasses.size());
assertTrue(
"Expecting registration for DocumentUpdatingEvent",
eventClasses.contains(DocumentUpdatingEvent.class));
assertTrue(
"Expecting registration for DocumentUpdatedEvent events",
eventClasses.contains(DocumentUpdatedEvent.class));
}
@Override
public void addEvent(String listenerName, Event event) {
Map<String, RegisteredListener> listeners = getListenersByEvent().get(event.getClass());
if (listeners == null) {
listeners = new ConcurrentHashMap<String, RegisteredListener>();
this.listenersByEvent.put(event.getClass(), listeners);
}
RegisteredListener listener = listeners.get(listenerName);
if (listener != null) {
listener.addEvent(event);
} else {
listeners.put(listenerName, new RegisteredListener(this.getListener(listenerName), event));
}
}
@Override
public void notify(Event event, Object source, Object data) {
// Find all listeners for this event
Map<String, RegisteredListener> regListeners = getListenersByEvent().get(event.getClass());
if (regListeners != null) {
notify(regListeners.values(), event, source, data);
}
// Find listener listening all events
Map<String, RegisteredListener> allEventRegListeners =
this.listenersByEvent.get(AllEvent.class);
if (allEventRegListeners != null) {
notify(allEventRegListeners.values(), event, source, data);
}
// We want this Observation Manager to be able to handle new Event Listener components being
// added or removed
// at runtime. Thus ideally we should make this Manager an Event Listener itself. However in
// order to avoid
// circular dependencies issues and in order to be more performant we simply handle
// ComponentDescriptorEvents
// here to add/remove Event Listeners.
if (event instanceof ComponentDescriptorEvent) {
onComponentEvent(
(ComponentDescriptorEvent) event,
(ComponentManager) source,
(ComponentDescriptor<EventListener>) data);
}
}
@Override
public void removeEvent(String listenerName, Event event) {
Map<String, RegisteredListener> listeners = getListenersByEvent().get(event.getClass());
RegisteredListener listener = listeners.get(listenerName);
if (listener != null) {
listener.removeEvent(event);
}
}
@Override
public void addListener(EventListener eventListener) {
// Register the listener by name. If already registered, override it.
EventListener previousListener =
getListenersByName().put(eventListener.getName(), eventListener);
// If the passed event listener name is already registered, log a warning
if (previousListener != null) {
this.logger.warn(
"The [{}] listener has overwritten a previously "
+ "registered listener [{}] since they both are registered under the same id [{}]. "
+ "In the future consider removing a Listener first if you really want to register it again.",
new Object[] {
eventListener.getClass().getName(),
previousListener.getClass().getName(),
eventListener.getName()
});
}
// For each event defined for this listener, add it to the Event Map.
for (Event event : eventListener.getEvents()) {
// Check if this is a new Event type not already registered
Map<String, RegisteredListener> eventListeners = this.listenersByEvent.get(event.getClass());
if (eventListeners == null) {
// No listener registered for this event yet. Create a map to store listeners for this
// event.
eventListeners = new ConcurrentHashMap<String, RegisteredListener>();
this.listenersByEvent.put(event.getClass(), eventListeners);
// There is no RegisteredListener yet, create one
eventListeners.put(eventListener.getName(), new RegisteredListener(eventListener, event));
} else {
// Add an event to existing RegisteredListener object
RegisteredListener registeredListener = eventListeners.get(eventListener.getName());
if (registeredListener == null) {
eventListeners.put(eventListener.getName(), new RegisteredListener(eventListener, event));
} else {
registeredListener.addEvent(event);
}
}
}
}
/**
* Call the provided listeners matching the passed Event. The definition of <em>source</em> and
* <em>data</em> is purely up to the communicating classes.
*
* @param listeners the listeners to notify
* @param event the event to pass to the registered listeners
* @param source the source of the event (or <code>null</code>)
* @param data the additional data related to the event (or <code>null</code>)
*/
private void notify(
Collection<RegisteredListener> listeners, Event event, Object source, Object data) {
for (RegisteredListener listener : listeners) {
// Verify that one of the events matches and send the first matching event
for (Event listenerEvent : listener.events) {
if (listenerEvent.matches(event)) {
try {
listener.listener.onEvent(event, source, data);
} catch (Exception e) {
// protect from bad listeners
this.logger.error(
"Failed to send event [{}] to listener [{}]",
new Object[] {event, listener.listener, e});
}
// Only send the first matching event since the listener should only be called once per
// event.
break;
}
}
}
}
