/*--------------------------------*- Java -*---------------------------------*\
 |		 o                                                                   |                                                                                     
 |    o     o       | HelyxOS: The Open Source GUI for OpenFOAM              |
 |   o   O   o      | Copyright (C) 2012-2016 ENGYS                          |
 |    o     o       | http://www.engys.com                                   |
 |       o          |                                                        |
 |---------------------------------------------------------------------------|
 |	 License                                                                 |
 |   This file is part of HelyxOS.                                           |
 |                                                                           |
 |   HelyxOS is free software; you can redistribute it and/or modify it      |
 |   under the terms of the GNU General Public License as published by the   |
 |   Free Software Foundation; either version 2 of the License, or (at your  |
 |   option) any later version.                                              |
 |                                                                           |
 |   HelyxOS is distributed in the hope that it will be useful, but WITHOUT  |
 |   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or   |
 |   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License   |
 |   for more details.                                                       |
 |                                                                           |
 |   You should have received a copy of the GNU General Public License       |
 |   along with HelyxOS; if not, write to the Free Software Foundation,      |
 |   Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA            |
\*---------------------------------------------------------------------------*/

package eu.engys.util.ui;

import java.lang.reflect.InvocationTargetException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

import javax.swing.SwingUtilities;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ExecUtil {

    private static final Logger logger = LoggerFactory.getLogger(ExecUtil.class);

    public static void invokeLater(Runnable runnable) {
        if (SwingUtilities.isEventDispatchThread()) {
            runnable.run();
        } else {
            SwingUtilities.invokeLater(runnable);
        }
    }

    public static void invokeAndWait(Runnable runnable) {
        if (SwingUtilities.isEventDispatchThread()) {
            runnable.run();
        } else {
            try {
                SwingUtilities.invokeAndWait(runnable);
            } catch (InvocationTargetException | InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    public static void execSerial(Runnable... runnables) {
        for (Runnable runnable : runnables) {
            runnable.run();
        }
    }

    public static void execParallelAndWait(Runnable... runnables) {
        if (runnables.length > 0) {
            ExecutorService service = createParallelExecutor(runnables.length);
            for (Runnable runnable : runnables) {
                service.submit(runnable);
            }
            awaitTermination(service);
        }
    }

    public static ExecutorService createParallelExecutor(int np) {
        return Executors.newFixedThreadPool(np);
    }

    public static void awaitTermination(ExecutorService service) {
        service.shutdown();
        try {
            service.awaitTermination(Long.MAX_VALUE, TimeUnit.SECONDS);
        } catch (InterruptedException e) {
            logger.error("Thread interrupted", e);
        }
    }

}
