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AnnotatedEventManager.java
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AnnotatedEventManager.java
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/*
* Copyright 2015-2016 Austin Keener & Michael Ritter
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.dv8tion.jda.core.hooks;
import net.dv8tion.jda.core.entities.impl.JDAImpl;
import net.dv8tion.jda.core.events.Event;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.*;
public class AnnotatedEventManager implements IEventManager
{
private final Set<Object> listeners = new HashSet<>();
private final Map<Class<? extends Event>, Map<Object, List<Method>>> methods = new HashMap<>();
@Override
public void register(Object listener)
{
if (listeners.add(listener))
{
updateMethods();
}
}
@Override
public void unregister(Object listener)
{
if (listeners.remove(listener))
{
updateMethods();
}
}
@Override
public List<Object> getRegisteredListeners()
{
return Collections.unmodifiableList(new LinkedList<>(listeners));
}
@Override
@SuppressWarnings("unchecked")
public void handle(Event event)
{
Class<? extends Event> eventClass = event.getClass();
do
{
Map<Object, List<Method>> listeners = methods.get(eventClass);
if (listeners != null)
{
listeners.entrySet().forEach(e -> e.getValue().forEach(method ->
{
try
{
method.setAccessible(true);
method.invoke(e.getKey(), event);
}
catch (IllegalAccessException | InvocationTargetException e1)
{
JDAImpl.LOG.log(e1);
}
catch (Throwable throwable)
{
JDAImpl.LOG.fatal("One of the EventListeners had an uncaught exception");
JDAImpl.LOG.log(throwable);
}
}));
}
eventClass = eventClass == Event.class ? null : (Class<? extends Event>) eventClass.getSuperclass();
}
while (eventClass != null);
}
private void updateMethods()
{
methods.clear();
for (Object listener : listeners)
{
boolean isClass = listener instanceof Class;
Class<?> c = isClass ? (Class) listener : listener.getClass();
Method[] allMethods = c.getDeclaredMethods();
for (Method m : allMethods)
{
if (!m.isAnnotationPresent(SubscribeEvent.class) || (isClass && !Modifier.isStatic(m.getModifiers())))
{
continue;
}
Class<?>[] pType = m.getParameterTypes();
if (pType.length == 1 && Event.class.isAssignableFrom(pType[0]))
{
@SuppressWarnings("unchecked")
Class<? extends Event> eventClass = (Class<? extends Event>) pType[0];
if (!methods.containsKey(eventClass))
{
methods.put(eventClass, new HashMap<>());
}
if (!methods.get(eventClass).containsKey(listener))
{
methods.get(eventClass).put(listener, new ArrayList<>());
}
methods.get(eventClass).get(listener).add(m);
}
}
}
}
}