Events.java

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package org.glassfish.api.event;

import org.jvnet.hk2.annotations.Contract;

/**
 * Contract to register/unregister events listener.
 * This implementation is not meant to be used for performance sensitive 
 * message delivery.
 * 
 * @author Jerome Dochez
 */
@Contract
public interface Events {

    /**
     * Registers a new listener for global events
     * 
     * @param listener the new listener
     */
    public void register(EventListener listener);

    /**
     * Unregisteres a listener
     *
     * @param listener the register to remove
     * @return true if the removal was successful
     */
    public boolean unregister(EventListener listener);

    /**
     * Sends a event asynchronously
     *
     * @param event event to send
     */
    public void send(EventListener.Event event);

    /**
     * Sends a event to all listener synchronously or asynchronously.
     *
     * @param event event to send
     * @param asynchronously true if the event should be sent asynchronously
     */
    public void send(EventListener.Event event, boolean asynchronously);
}