001    /*
002     * $Id: GuiExecutor.java,v 1.5 2012/02/19 17:35:52 davep Exp $
003     *
004     * This file is part of McIDAS-V
005     *
006     * Copyright 2007-2012
007     * Space Science and Engineering Center (SSEC)
008     * University of Wisconsin - Madison
009     * 1225 W. Dayton Street, Madison, WI 53706, USA
010     * https://www.ssec.wisc.edu/mcidas
011     * 
012     * All Rights Reserved
013     * 
014     * McIDAS-V is built on Unidata's IDV and SSEC's VisAD libraries, and
015     * some McIDAS-V source code is based on IDV and VisAD source code.  
016     * 
017     * McIDAS-V is free software; you can redistribute it and/or modify
018     * it under the terms of the GNU Lesser Public License as published by
019     * the Free Software Foundation; either version 3 of the License, or
020     * (at your option) any later version.
021     * 
022     * McIDAS-V is distributed in the hope that it will be useful,
023     * but WITHOUT ANY WARRANTY; without even the implied warranty of
024     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
025     * GNU Lesser Public License for more details.
026     * 
027     * You should have received a copy of the GNU Lesser Public License
028     * along with this program.  If not, see http://www.gnu.org/licenses.
029     */
030    package edu.wisc.ssec.mcidasv.util;
031    
032    import java.util.List;
033    import java.util.concurrent.AbstractExecutorService;
034    import java.util.concurrent.TimeUnit;
035    
036    import javax.swing.SwingUtilities;
037    
038    
039    /**
040     * Executor built atop SwingUtilities. Courtesy of <i>Java Concurrency in 
041     * Practice</i>, written by Brian Goetz and Tim Peierls.
042     */
043    // TODO: couldn't find a license for this code? is it public domain?
044    public class GuiExecutor extends AbstractExecutorService {
045        // Singletons have a private constructor and a public factory
046        private static final GuiExecutor instance = new GuiExecutor();
047    
048        private GuiExecutor() {
049        }
050    
051        public static GuiExecutor instance() {
052            return instance;
053        }
054    
055        public void execute(Runnable r) {
056            if (SwingUtilities.isEventDispatchThread())
057                r.run();
058            else
059                SwingUtilities.invokeLater(r);
060        }
061    
062        public void shutdown() {
063            throw new UnsupportedOperationException();
064        }
065    
066        public List<Runnable> shutdownNow() {
067            throw new UnsupportedOperationException();
068        }
069    
070        public boolean awaitTermination(long timeout, TimeUnit unit)
071                throws InterruptedException {
072            throw new UnsupportedOperationException();
073        }
074    
075        public boolean isShutdown() {
076            return false;
077        }
078    
079        public boolean isTerminated() {
080            return false;
081        }
082    }