001/*
002 * JGrapes Event Driven Framework
003 * Copyright (C) 2017-2018 Michael N. Lipp
004 * 
005 * This program is free software; you can redistribute it and/or modify it 
006 * under the terms of the GNU Affero General Public License as published by 
007 * the Free Software Foundation; either version 3 of the License, or 
008 * (at your option) any later version.
009 * 
010 * This program is distributed in the hope that it will be useful, but 
011 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
012 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License 
013 * for more details.
014 * 
015 * You should have received a copy of the GNU Affero General Public License along 
016 * with this program; if not, see <http://www.gnu.org/licenses/>.
017 */
018
019package org.jgrapes.io.util;
020
021import java.util.EventListener;
022
023/**
024 * Used to notify interested objects about the changed availability
025 * of permits.
026 */
027public interface AvailabilityListener extends EventListener {
028
029    /**
030     * Called when the availability has changed.
031     *
032     * @param pool the pool
033     * @param available the available
034     */
035    void availabilityChanged(PermitsPool pool, boolean available);
036
037}