public <T extends Event> T callEvent(T event) {
HandlerList handlers = event.getHandlers();
ListenerRegistration[] listeners = handlers.getRegisteredListeners();
if (listeners != null) {
for (ListenerRegistration listener : listeners) {
try {
if (!event.isCancelled() || listener.getOrder().ignoresCancelled()) {
listener.getExecutor().execute(event);
}
} catch (Throwable ex) {
Spout.getEngine()
.getLogger()
.log(
Level.SEVERE,
"Could not pass event "
+ event.getEventName()
+ " to "
+ listener.getOwner().getClass().getName(),
ex);
}
}
event.setHasBeenCalled(true);
}
return event;
}
/**
* Registers the given event handler.
*
* @param handler The {@link EventHandler} to register.
*/
protected synchronized void register(final EventHandler handler) {
assert handler != null : "Handler cannot be null!";
SimpleEventManager.LOGGER.debug("Registering event handler " + handler);
final Object obj = handler.getListenerObject();
final Method method = handler.getListenerMethod();
final Class<?> clazz = method.getDeclaringClass();
if (!method.isAnnotationPresent(EventListener.class)) {
SimpleEventManager.LOGGER.debug("Skipping event handler " + handler);
return;
}
SimpleEventManager.LOGGER.debug("Processing event handler " + handler);
assert obj != null || Modifier.isStatic(method.getModifiers())
: "Method \""
+ method.getName()
+ "\" in class \""
+ clazz.getName()
+ "\" cannot be non-static if obj is null!";
assert method.getParameterTypes().length == 1
&& method.getParameterTypes()[0].equals(EventContext.class)
: "The "
+ "arguments of the method \""
+ method.getName()
+ "\" in class \""
+ clazz.getName()
+ "\" are wrong! The first (and only) argument should have the type \""
+ EventContext.class.getName()
+ "\"!";
final Class<? extends AbstractEvent> eventClass =
method.getAnnotation(EventListener.class).value();
final HandlerList handlers;
try {
final Field handlersField = eventClass.getDeclaredField("HANDLERS");
final boolean handlersFieldAccessible = handlersField.isAccessible();
handlersField.setAccessible(true);
handlers = (HandlerList) handlersField.get(obj);
handlersField.setAccessible(handlersFieldAccessible);
} catch (final IllegalArgumentException cause) {
throw new EventException(
"An error occurred whilest retriving handler list from class \""
+ clazz.getName()
+ "\"!",
cause);
} catch (final SecurityException cause) {
throw new EventException(
"An error occurred whilest retriving handler list from class \""
+ clazz.getName()
+ "\"!",
cause);
} catch (final IllegalAccessException cause) {
throw new EventException(
"An error occurred whilest retriving handler list from class \""
+ clazz.getName()
+ "\"!",
cause);
} catch (final NoSuchFieldException cause) {
throw new EventException(
"An error occurred whilest retriving handler list from class \""
+ clazz.getName()
+ "\"!",
cause);
}
handlers.add(new SimpleEventHandler(obj, method));
SimpleEventManager.LOGGER.debug("Registration of event handler finished");
}
