/*
* This file is part of NucleusFramework for Bukkit, licensed under the MIT License (MIT).
*
* Copyright (c) JCThePants (www.jcwhatever.com)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.jcwhatever.nucleus.utils.observer.event;
import com.jcwhatever.nucleus.utils.observer.ISubscriber;
import javax.annotation.Nullable;
/**
* A type that subscribes to events received from an {@link IEventAgent}.
*
* <p>Usage is similar in context to an update subscriber except the event subscriber
* is more complex.</p>
*
* <p>If you're usage context does not require event priorities and event cancelling,
* it is recommended to use {@link com.jcwhatever.nucleus.utils.observer.update.IUpdateSubscriber}
* in conjunction with {@link com.jcwhatever.nucleus.utils.observer.update.IUpdateAgent}
* instead.</p>
*/
public interface IEventSubscriber<E> extends ISubscriber, Comparable<IEventSubscriber<E>> {
/**
* Get the event priority.
*/
EventSubscriberPriority getPriority();
/**
* Determine if the subscriber should still be notified
* of an event if it's cancelled.
*/
boolean isInvokedForCancelled();
/**
* Invoked by an {@link IEventAgent} to notify the subscriber
* of an event.
*
* @param source The source of the event.
* @param event The event.
*/
void onEvent(@Nullable Object source, E event);
}