/*
* Copyright (C) 2016 Álinson Santos Xavier <isoron@gmail.com>
*
* This file is part of Loop Habit Tracker.
*
* Loop Habit Tracker 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 3 of the License, or (at your
* option) any later version.
*
* Loop Habit Tracker 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.isoron.uhabits.utils;
import org.isoron.uhabits.activities.*;
import java.util.*;
import java.util.concurrent.*;
import javax.inject.*;
/**
* A class that emits events when a new day starts.
*/
@ActivityScope
public class MidnightTimer
{
private final List<MidnightListener> listeners;
private ScheduledExecutorService executor;
@Inject
public MidnightTimer()
{
this.listeners = new LinkedList<>();
}
public synchronized void addListener(MidnightListener listener)
{
this.listeners.add(listener);
}
public synchronized void onPause()
{
executor.shutdownNow();
}
public synchronized void onResume()
{
executor = Executors.newSingleThreadScheduledExecutor();
executor.scheduleAtFixedRate(() -> notifyListeners(),
DateUtils.millisecondsUntilTomorrow() + 1000,
DateUtils.millisecondsInOneDay, TimeUnit.MILLISECONDS);
}
public synchronized void removeListener(MidnightListener listener)
{
this.listeners.remove(listener);
}
private synchronized void notifyListeners()
{
for (MidnightListener l : listeners) l.atMidnight();
}
public interface MidnightListener
{
void atMidnight();
}
}