001/*
002 * This file is part of McIDAS-V
003 *
004 * Copyright 2007-2025
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 https://www.gnu.org/licenses/.
027 */
028package edu.wisc.ssec.mcidasv.util;
029
030import java.util.List;
031import java.util.concurrent.AbstractExecutorService;
032import java.util.concurrent.TimeUnit;
033
034import 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?
042public 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}