001    /*
002     * This file is part of McIDAS-V
003     *
004     * Copyright 2007-2013
005     * Space Science and Engineering Center (SSEC)
006     * University of Wisconsin - Madison
007     * 1225 W. Dayton Street, Madison, WI 53706, USA
008     * https://www.ssec.wisc.edu/mcidas
009     * 
010     * All Rights Reserved
011     * 
012     * McIDAS-V is built on Unidata's IDV and SSEC's VisAD libraries, and
013     * some McIDAS-V source code is based on IDV and VisAD source code.  
014     * 
015     * McIDAS-V is free software; you can redistribute it and/or modify
016     * it under the terms of the GNU Lesser Public License as published by
017     * the Free Software Foundation; either version 3 of the License, or
018     * (at your option) any later version.
019     * 
020     * McIDAS-V is distributed in the hope that it will be useful,
021     * but WITHOUT ANY WARRANTY; without even the implied warranty of
022     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
023     * GNU Lesser Public License for more details.
024     * 
025     * You should have received a copy of the GNU Lesser Public License
026     * along with this program.  If not, see http://www.gnu.org/licenses.
027     */
028    package edu.wisc.ssec.mcidasv.util;
029    
030    import java.util.List;
031    import java.util.concurrent.AbstractExecutorService;
032    import java.util.concurrent.TimeUnit;
033    
034    import javax.swing.SwingUtilities;
035    
036    
037    /**
038     * Executor built atop SwingUtilities. Courtesy of <i>Java Concurrency in 
039     * Practice</i>, written by Brian Goetz and Tim Peierls.
040     */
041    // TODO: couldn't find a license for this code? is it public domain?
042    public class GuiExecutor extends AbstractExecutorService {
043        // Singletons have a private constructor and a public factory
044        private static final GuiExecutor instance = new GuiExecutor();
045    
046        private GuiExecutor() {
047        }
048    
049        public static GuiExecutor instance() {
050            return instance;
051        }
052    
053        public void execute(Runnable r) {
054            if (SwingUtilities.isEventDispatchThread())
055                r.run();
056            else
057                SwingUtilities.invokeLater(r);
058        }
059    
060        public void shutdown() {
061            throw new UnsupportedOperationException();
062        }
063    
064        public List<Runnable> shutdownNow() {
065            throw new UnsupportedOperationException();
066        }
067    
068        public boolean awaitTermination(long timeout, TimeUnit unit)
069                throws InterruptedException {
070            throw new UnsupportedOperationException();
071        }
072    
073        public boolean isShutdown() {
074            return false;
075        }
076    
077        public boolean isTerminated() {
078            return false;
079        }
080    }