/*
 * Copyright (c) 2013-2014, Parallel Universe Software Co. All rights reserved.
 * 
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *  
 *   or (per the licensee's choosing)
 *  
 * under the terms of the GNU Lesser General Public License version 3.0
 * as published by the Free Software Foundation.
 */
package co.paralleluniverse.common.util;

import java.util.List;
import java.util.concurrent.AbstractExecutorService;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.TimeUnit;

/**
 *
 * @author pron
 */
public final class SameThreadExecutorService extends AbstractExecutorService implements Executor {
    private static final SameThreadExecutorService INSTANCE = new SameThreadExecutorService();

    public static ExecutorService getExecutorService() {
        return INSTANCE;
    }
    
    @Override
    public void execute(Runnable command) {
        command.run();
    }

    @Override
    public void shutdown() {
    }

    @Override
    public List<Runnable> shutdownNow() {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean isShutdown() {
        return false;
    }

    @Override
    public boolean isTerminated() {
        return false;
    }

    @Override
    public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException {
        throw new UnsupportedOperationException();
    }
    
    
    private SameThreadExecutorService() {
    }
}