BallThread.java

/**
 * The MIT License
 * Copyright (c) 2014-2016 Ilkka Seppälä
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.iluwatar.twin;

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

/**
 * This class is a UI thread for drawing the {@link BallItem}, and provide the method for suspend
 * and resume. It hold the reference of {@link BallItem} to delegate the draw task.
 * 
 */

public class BallThread extends Thread {

  private static final Logger LOGGER = LoggerFactory.getLogger(BallThread.class);

  private BallItem twin;

  private volatile boolean isSuspended;

  private volatile boolean isRunning = true;

  public void setTwin(BallItem twin) {
    this.twin = twin;
  }

  /**
   * Run the thread
   */
  public void run() {

    while (isRunning) {
      if (!isSuspended) {
        twin.draw();
        twin.move();
      }
      try {
        Thread.sleep(250);
      } catch (InterruptedException e) {
        throw new RuntimeException(e);
      }
    }
  }

  public void suspendMe() {
    isSuspended = true;
    LOGGER.info("Begin to suspend BallThread");
  }

  public void resumeMe() {
    isSuspended = false;
    LOGGER.info("Begin to resume BallThread");
  }

  public void stopMe() {
    this.isRunning = false;
    this.isSuspended = true;
  }
}