Android Open Source - FPlayAndroid Timer

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The source code is released under:
Copyright (c) 2013-2014, Carlos Rafael Gimenes das Neves All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the followin...
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Java Source Code

//
// FPlayAndroid is distributed under the FreeBSD License
////  w ww  .  ja  v a 2 s .  com
// Copyright (c) 2013-2014, Carlos Rafael Gimenes das Neves
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// The views and conclusions contained in the software and documentation are those
// of the authors and should not be interpreted as representing official policies,
// either expressed or implied, of the FreeBSD Project.
//
// https://github.com/carlosrafaelgn/FPlayAndroid
//
package br.com.carlosrafaelgn.fplay.util;

import android.os.Message;
import android.os.SystemClock;

import br.com.carlosrafaelgn.fplay.activity.MainHandler;

public final class Timer implements MainHandler.Callback {
  public static interface TimerHandler {
    public void handleTimer(Timer timer, Object param);
  }
  
  private static final int MSG_ONESHOT = 0x0200;
  private static final int MSG_INTERVAL = 0x0201;
  private final Object sync;
  private final String name;
  private final boolean oneShot, handledOnMain, compensatingForDelays;
  private volatile Runnable runnable;
  private volatile TimerHandler timerHandler;
  private volatile int interval, version;
  private volatile TimerThread thread;
  private volatile boolean alive, paused;
  private volatile Object param;
  private long nextTime;
  
  private class TimerThread extends Thread {
    private final int myVersion;
    
    public TimerThread(int myVersion, String name) {
      super((name == null) ? "Timer Thread" : name);
      this.myVersion = myVersion;
    }
    
    @Override
    public void run() {
      long lastTime = SystemClock.uptimeMillis();
      while (version == myVersion) {
        if (paused) {
          synchronized (sync) {
            try {
              sync.wait();
            } catch (InterruptedException e) { }
          }
          if (version != myVersion)
            break;
        }
        if (compensatingForDelays) {
          final long now = SystemClock.uptimeMillis();
          final int actualInterval = interval - ((int)now - (int)lastTime);
          lastTime = now;
          if (actualInterval > 0) {
            synchronized (sync) {
              try {
                sync.wait(actualInterval);
              } catch (InterruptedException e) { }
            }
          } else {
            synchronized (sync) {
              try {
                sync.wait(1); //just not to hog the CPU!
              } catch (InterruptedException e) { }
            }
          }
        } else {
          synchronized (sync) {
            try {
              sync.wait(interval);
            } catch (InterruptedException e) { }
          }
        }
        if (paused)
          continue;
        try {
          if (version == myVersion) {
            if (runnable != null)
              runnable.run();
            else if (timerHandler != null)
              timerHandler.handleTimer(Timer.this, param);
          }
        } catch (Throwable ex) {
          ex.printStackTrace();
          break;
        }
        if (oneShot)
          break;
      }
      if (version == myVersion) {
        synchronized (sync) {
          if (version == myVersion) {
            thread = null;
            alive = false;
          }
        }
      }
    }
  }
  
  public Timer(Runnable runnable, String name, boolean oneShot, boolean handledOnMain, boolean compensatingForDelays) {
    this.sync = new Object();
    this.runnable = runnable;
    this.timerHandler = null;
    this.name = name;
    this.oneShot = oneShot;
    this.handledOnMain = handledOnMain;
    this.compensatingForDelays = compensatingForDelays;
  }
  
  public Timer(TimerHandler timerHandler, String name, boolean oneShot, boolean handledOnMain, boolean compensatingForDelays) {
    this.sync = new Object();
    this.runnable = null;
    this.timerHandler = timerHandler;
    this.name = name;
    this.oneShot = oneShot;
    this.handledOnMain = handledOnMain;
    this.compensatingForDelays = compensatingForDelays;
  }
  
  public void start(int interval) {
    if (handledOnMain) {
      version++;
      this.interval = interval;
      param = null;
      alive = true;
      thread = null;
      if (oneShot) {
        MainHandler.sendMessageDelayed(this, MSG_ONESHOT, version, 0, interval);
      } else {
        if (compensatingForDelays)
          nextTime = SystemClock.uptimeMillis() + interval;
        MainHandler.sendMessageDelayed(this, MSG_INTERVAL, version, 0, interval);
      }
    } else {
      synchronized (sync) {
        version++;
        this.interval = interval;
        param = null;
        alive = true;
        thread = new TimerThread(version, name);
        thread.start();
      }
    }
  }
  
  public void start(int interval, Object param) {
    if (handledOnMain) {
      version++;
      this.interval = interval;
      this.param = param;
      alive = true;
      paused = false;
      thread = null;
      if (oneShot) {
        MainHandler.sendMessageDelayed(this, MSG_ONESHOT, version, 0, interval);
      } else {
        if (compensatingForDelays)
          nextTime = SystemClock.uptimeMillis() + interval;
        MainHandler.sendMessageDelayed(this, MSG_INTERVAL, version, 0, interval);
      }
    } else {
      synchronized (sync) {
        version++;
        if (paused && thread != null)
          sync.notifyAll();
        this.interval = interval;
        this.param = param;
        alive = true;
        paused = false;
        thread = new TimerThread(version, name);
        thread.start();
      }
    }
  }
  
  public void pause() {
    if (alive && !handledOnMain)
      paused = true;
  }
  
  public void resume() {
    if (alive && !handledOnMain && paused) {
      paused = false;
      synchronized (sync) {
        sync.notifyAll();
      }
    }
  }
  
  public void stop() {
    paused = false;
    if (alive) {
      if (handledOnMain) {
        version++;
      } else {
        synchronized (sync) {
          version++;
          if (thread != null) {
            sync.notifyAll();
            thread = null;
          }
        }
      }
      alive = false;
    }
  }
  
  public void stopAndWait() {
    paused = false;
    if (alive) {
      if (handledOnMain) {
        version++;
      } else {
        Thread t;
        synchronized (sync) {
          version++;
          t = thread;
          if (thread != null) {
            sync.notifyAll();
            thread = null;
          }
        }
        if (t != null) {
          try {
            t.join();
          } catch (InterruptedException e) { }
        }
      }
      alive = false;
    }
  }
  
  public void release() {
    runnable = null;
    timerHandler = null;
    param = null;
  }
  
  @Override
  public boolean handleMessage(Message msg) {
    if (msg.arg1 == version) {
      switch (msg.what) {
      case MSG_INTERVAL:
        if (runnable != null)
          runnable.run();
        else if (timerHandler != null)
          timerHandler.handleTimer(this, param);
        if (alive) {
          if (compensatingForDelays) {
            final long now = SystemClock.uptimeMillis(), next = nextTime + interval;
            nextTime = ((next < now) ? now : next);
            MainHandler.sendMessageAtTime(this, MSG_INTERVAL, version, 0, nextTime);
          } else {
            MainHandler.sendMessageDelayed(this, MSG_INTERVAL, version, 0, interval);
          }
        }
        break;
      case MSG_ONESHOT:
        alive = false;
        if (runnable != null)
          runnable.run();
        else if (timerHandler != null)
          timerHandler.handleTimer(this, param);
        break;
      }
    }
    return true;
  }
  
  public int getInterval() {
    return interval;
  }
  
  public boolean isPaused() {
    return paused;
  }
  
  public boolean isAlive() {
    return alive;
  }
  
  public boolean isCompensatingForDelays() {
    return compensatingForDelays;
  }
  
  public boolean isHandledOnMain() {
    return handledOnMain;
  }
}
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