Android Open Source - splott Needle

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License

The source code is released under:

MIT License

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Java Source Code

package com.wordsaretoys.rise.utility;
// www.j  a  v a2s  . c o m
/**
 * guides a thread (hyuck hyuck)
 * provides safe suspend/resume semantics
 */

public abstract class Needle implements Runnable {

  enum ThreadState { RUN, PAUSE, STOP }
  protected Thread thread = new Thread(this);
  ThreadState state = ThreadState.PAUSE;
  long timeout;
  
  public Needle(String name, long timeout) {
    thread.setName(name);
    this.timeout = timeout;
  }
  
  public void start() {
    thread.start();
  }
  
  public void setName(String name) {
    thread.setName(name);
  }
  
  public boolean isRunning() {
    return state == ThreadState.RUN;
  }
  
  public boolean isPaused() {
    return state == ThreadState.PAUSE;
  }
  
  public boolean isStopped() {
    return state == ThreadState.STOP;
  }
  
  public boolean isLooping() {
    return state != ThreadState.STOP;
  }

  public synchronized void resume() {
    state = ThreadState.RUN;
    notify();
  }
  
  public synchronized void pause() {
    state = ThreadState.PAUSE;
  }
  
  public synchronized void stop() {
    state = ThreadState.STOP;
    notify();
  }
  
  protected boolean block(long time) {
    try {
      synchronized(this) {
        // timed wait
        wait(time);
        // thread suspension check/wait
        while(state == ThreadState.PAUSE) {
          wait();
        }
      }
    } catch(InterruptedException e) {
      return true;
    }
    return false;
  }
  
  protected boolean inPump() {
    block(timeout);
    return isLooping();
  }
  
  public void setPriority(int priority) {
    thread.setPriority(priority);
  }
  
  public abstract void run();
}

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