/**
 * @描述    线程管理池
 * @项目名称   App_Shop
 * @包名     com.android.shop.manager
 * @类名     ThreadManager
 * @author   chenlin
 * @date    2014年3月29日 下午10:17:06
 */
public class ThreadManager {
  private ThreadManager(){};
  private static ThreadManager instance= new ThreadManager();
  private ThreadPoolProxy longPoolProxy;
  private ThreadPoolProxy shortPoolProxy;
  public static ThreadManager getInstance(){
    return instance;
  }
  /**
   * 长线程池
   * @return
   */
  public synchronized ThreadPoolProxy createLongPool(){
    if (longPoolProxy == null) {
      //(int corePoolSize 线程池大小, int maximumPoolSize 最大值, long keepAliveTime 存活时间)
      longPoolProxy = new ThreadPoolProxy(5, 5, 5000);
    }
    return longPoolProxy;
  }
  /**
   * 短线程池
   * @return
   */
  public synchronized ThreadPoolProxy createShortPool(){
    if (shortPoolProxy == null) {
      shortPoolProxy = new ThreadPoolProxy(3, 3, 5000);
    }
    return shortPoolProxy;
  }
  public class ThreadPoolProxy{
    private ThreadPoolExecutor pool;
    private int corePoolSize; //线程数
    private int maximumPoolSize; //线程满了后额外开的线程窗口
    private long keepAliveTime;//没有线程执行时存活时间
    public ThreadPoolProxy(int corePoolSize,int maximumPoolSize, long keepAliveTime){
      this.corePoolSize = corePoolSize;
      this.maximumPoolSize = maximumPoolSize;
      this.keepAliveTime = keepAliveTime;
    }
    /**
     * 执行线程
     * @param runnable
     */
    public void execute(Runnable runnable){
      if (pool == null) {
        //最多可有多少个线程排队
        BlockingQueue workQueue = new LinkedBlockingQueue(10);
        pool = new ThreadPoolExecutor(corePoolSize, maximumPoolSize, keepAliveTime, TimeUnit.MILLISECONDS, workQueue);
      }
      pool.execute(runnable);
    }
    /**
     * 取消线程
     * @param runnable
     */
    public void cancel(Runnable runnable){
      if (pool != null) {
        pool.remove(runnable);
      }
    }
  }
}

ThreadManager.getInstance().createLongPool().execute(new Runnable() {
  @Override
  public void run() {
    //SystemClock.sleep(2000);
    final LoadResult result = loadFromServer();
    if (result != null) {
      Util.runOnUiThread(new Runnable() {
        @Override
        public void run() {
          currentState = result.getValue();
          showPages();
        }
      });
    }
  }
});