Android Open Source - Schooner-3D Time

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2012 Dan Mercer/*from   ww w  . jav  a  2  s.c om*/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.supermercerbros.gameengine.engine;

import java.util.LinkedList;

/**
 * This singleton class handles pausing in the game engine.
 */
public enum Time {
  INSTANCE;
  
  /**
   * Represents an object that should be notified when the game engine resumes
   * after being paused.
   */
  public interface Pausable {
    /**
     * Called when the game engine resumes after being paused. 
     * @param millis The length of the pause duration, in millis.
     */
    void onResume(long millis);
  }
  
  // Fields
  private final LinkedList<Pausable> pausables;
  private boolean paused = false;
  private long pauseTime = 0L;

  private Time() {
    this.pausables = new LinkedList<Time.Pausable>();
  }
  
  /**
   * Adds the given Pausable to the Time object's list.
   * @param p The Pausable to add.
   */
  public synchronized void addPausable(Pausable p) {
    pausables.add(p);
  }
  
  /**
   * Removes the given Pausable from the Time object's list.
   * @param p The Pausable to remove.
   */
  public synchronized void removePausable(Pausable p) {
    pausables.remove(p);
  }
  
  /**
   * Called when the Engine pauses
   */
  synchronized void pause() {
    paused = true;
    pauseTime = System.currentTimeMillis();
  }
  
  /**
   * Called when the Engine resumes
   */
  synchronized void resume() {
    if (paused) {
      final long timeDelta = System.currentTimeMillis() - pauseTime;
      for (Pausable p : pausables) {
        p.onResume(timeDelta);
      }
      paused = false;
    }
  }

}

Java Source Code List

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