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package ftbsc.geb;
import ftbsc.geb.api.IBus;
import ftbsc.geb.api.IEvent;
import ftbsc.geb.api.IEventDispatcher;
import ftbsc.geb.api.IListener;
import java.util.Map;
import java.util.Optional;
import java.util.ServiceLoader;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
/**
* The official GEB implementation of {@link IBus}.
* @since 0.1.0
*/
public class GEB implements IBus {
/**
* A {@link Map} tying each listener class to its instance.
*/
private final Map<Class<? extends IListener>, Set<IListener>> listenerMap;
/**
* A {@link Map} tying each event class to the appropriate dispatcher.
*/
private final Map<Class<? extends IEvent>, IEventDispatcher> dispatchMap;
/**
* The default public constructor.
*/
public GEB() {
this.listenerMap = new ConcurrentHashMap<>();
this.dispatchMap = new ConcurrentHashMap<>();
for(IEventDispatcher dispatcher : ServiceLoader.load(IEventDispatcher.class))
this.dispatchMap.put(dispatcher.eventType(), dispatcher);
}
/**
* Registers a new listener on the bus.
* @param listener the listener
*/
@Override
public void registerListener(IListener listener) {
this.listenerMap.putIfAbsent(
listener.getClass(),
ConcurrentHashMap.newKeySet()
);
}
/**
* Unregister a listener from the bus.
* @param listener the listener
*/
@Override
public void unregisterListener(IListener listener) {
this.listenerMap.computeIfPresent(
listener.getClass(),
(k, l) -> {
l.remove(listener);
return l;
}
);
}
/**
* Dispatches an event, calling all of its listeners that are subscribed to this bus.
* @param event the event to fire
* @return false if the event was canceled, true otherwise
*/
@Override
public boolean handleEvent(IEvent event) {
return Optional.ofNullable(this.dispatchMap.get(event.getClass()))
.map(dispatcher -> dispatcher.callListeners(event, this.listenerMap))
.orElse(true);
}
}
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zaaarf