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EventBus.java
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EventBus.java
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package meteordevelopment.orbit;
import meteordevelopment.orbit.listeners.IListener;
import meteordevelopment.orbit.listeners.LambdaListener;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.function.Function;
/**
* Default implementation of {@link IEventBus}.
*/
public class EventBus implements IEventBus {
private static class LambdaFactoryInfo {
public final String packagePrefix;
public final LambdaListener.Factory factory;
public LambdaFactoryInfo(String packagePrefix, LambdaListener.Factory factory) {
this.packagePrefix = packagePrefix;
this.factory = factory;
}
}
private final Map<Object, List<IListener>> listenerCache = new ConcurrentHashMap<>();
private final Map<Class<?>, List<IListener>> staticListenerCache = new ConcurrentHashMap<>();
private final Map<Class<?>, List<IListener>> listenerMap = new ConcurrentHashMap<>();
private final List<LambdaFactoryInfo> lambdaFactoryInfos = new ArrayList<>();
@Override
public void registerLambdaFactory(String packagePrefix, LambdaListener.Factory factory) {
synchronized (lambdaFactoryInfos) {
lambdaFactoryInfos.add(new LambdaFactoryInfo(packagePrefix, factory));
}
}
@Override
public boolean isListening(Class<?> eventKlass) {
List<IListener> listeners = listenerMap.get(eventKlass);
return listeners != null && !listeners.isEmpty();
}
@Override
public <T> T post(T event) {
List<IListener> listeners = listenerMap.get(event.getClass());
if (listeners != null) {
for (IListener listener : listeners) listener.call(event);
}
return event;
}
@Override
public <T extends ICancellable> T post(T event) {
List<IListener> listeners = listenerMap.get(event.getClass());
if (listeners != null) {
event.setCancelled(false);
for (IListener listener : listeners) {
listener.call(event);
if (event.isCancelled()) break;
}
}
return event;
}
@Override
public void subscribe(Object object) {
subscribe(getListeners(object.getClass(), object), false);
}
@Override
public void subscribe(Class<?> klass) {
subscribe(getListeners(klass, null), true);
}
@Override
public void subscribe(IListener listener) {
subscribe(listener, false);
}
private void subscribe(List<IListener> listeners, boolean onlyStatic) {
for (IListener listener : listeners) subscribe(listener, onlyStatic);
}
private void subscribe(IListener listener, boolean onlyStatic) {
if (onlyStatic) {
if (listener.isStatic()) insert(listenerMap.computeIfAbsent(listener.getTarget(), aClass -> new CopyOnWriteArrayList<>()), listener);
}
else {
insert(listenerMap.computeIfAbsent(listener.getTarget(), aClass -> new CopyOnWriteArrayList<>()), listener);
}
}
private void insert(List<IListener> listeners, IListener listener) {
int i = 0;
for (; i < listeners.size(); i++) {
if (listener.getPriority() > listeners.get(i).getPriority()) break;
}
listeners.add(i, listener);
}
@Override
public void unsubscribe(Object object) {
unsubscribe(getListeners(object.getClass(), object), false);
}
@Override
public void unsubscribe(Class<?> klass) {
unsubscribe(getListeners(klass, null), true);
}
@Override
public void unsubscribe(IListener listener) {
unsubscribe(listener, false);
}
private void unsubscribe(List<IListener> listeners, boolean staticOnly) {
for (IListener listener : listeners) unsubscribe(listener, staticOnly);
}
private void unsubscribe(IListener listener, boolean staticOnly) {
List<IListener> l = listenerMap.get(listener.getTarget());
if (l != null) {
if (staticOnly) {
if (listener.isStatic()) l.remove(listener);
}
else l.remove(listener);
}
}
private List<IListener> getListeners(Class<?> klass, Object object) {
Function<Object, List<IListener>> func = o -> {
List<IListener> listeners = new CopyOnWriteArrayList<>();
getListeners(listeners, klass, object);
return listeners;
};
if (object == null) return staticListenerCache.computeIfAbsent(klass, func);
// We need to check if the instances are the same and avoid using .equals() and .hashCode()
for (Object key : listenerCache.keySet()) {
if (key == object) return listenerCache.get(object);
}
List<IListener> listeners = func.apply(object);
listenerCache.put(object, listeners);
return listeners;
}
private void getListeners(List<IListener> listeners, Class<?> klass, Object object) {
for (Method method : klass.getDeclaredMethods()) {
if (isValid(method)) {
listeners.add(new LambdaListener(getLambdaFactory(klass), klass, object, method));
}
}
if (klass.getSuperclass() != null) getListeners(listeners, klass.getSuperclass(), object);
}
private boolean isValid(Method method) {
if (!method.isAnnotationPresent(EventHandler.class)) return false;
if (method.getReturnType() != void.class) return false;
if (method.getParameterCount() != 1) return false;
return !method.getParameters()[0].getType().isPrimitive();
}
private LambdaListener.Factory getLambdaFactory(Class<?> klass) {
synchronized (lambdaFactoryInfos) {
for (LambdaFactoryInfo info : lambdaFactoryInfos) {
if (klass.getName().startsWith(info.packagePrefix)) return info.factory;
}
}
throw new NoLambdaFactoryException(klass);
}
}