001/**
002 *   GRANITE DATA SERVICES
003 *   Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004 *
005 *   This file is part of the Granite Data Services Platform.
006 *
007 *   Granite Data Services is free software; you can redistribute it and/or
008 *   modify it under the terms of the GNU Lesser General Public
009 *   License as published by the Free Software Foundation; either
010 *   version 2.1 of the License, or (at your option) any later version.
011 *
012 *   Granite Data Services is distributed in the hope that it will be useful,
013 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
014 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
015 *   General Public License for more details.
016 *
017 *   You should have received a copy of the GNU Lesser General Public
018 *   License along with this library; if not, write to the Free Software
019 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
020 *   USA, or see <http://www.gnu.org/licenses/>.
021 */
022package org.granite.gravity;
023
024import java.util.concurrent.atomic.AtomicBoolean;
025
026/**
027 * @author Franck WOLFF
028 */
029public abstract class AsyncChannelRunner implements Runnable {
030
031        protected final Channel channel;
032        private final AtomicBoolean queued = new AtomicBoolean(false);
033        
034        public AsyncChannelRunner(Channel channel) {
035                this.channel = channel;
036        }
037        
038        public final boolean queue(Gravity gravity) {
039                if (queued.getAndSet(true))
040                        return false;
041                gravity.execute(this);
042                return true;
043        }
044        
045        public final void reset() {
046                queued.set(false);
047        }
048        
049        protected abstract void doRun();
050        
051        public final void run() {
052                try {
053                        doRun();
054                }
055                finally {
056                        queued.set(false);
057                }
058        }
059
060        @Override
061        public boolean equals(Object obj) {
062                return getClass().isInstance(obj) && channel.equals(((AsyncChannelRunner)obj).channel);
063        }
064
065        @Override
066        public int hashCode() {
067                return channel.hashCode();
068        }
069}