Java HashSet 同步查询

Question

同步问题:

Set s = Collections.synchronizedSet(new HashSet());
private Object monitor_ = new Object();

//Set has element added in another routine...

//Called by some thread1, thread2, ...
TimerTask run(){ //method which executes every 1 min
  synchronized(monitor_) {
  s.isEmpty()
  // ...
  // waits for 30 seconds
  // JNI call
  // ...
 }
}

//Called by cleanup thread
removecall()
{
 synchronized( monitor_ ) {
   s.remove( something );
 }
}

问题:当 TimerTask run 方法正在执行时，清理线程必须等待。任何有效的方法无需等待即可处理这种情况。例如可重入锁

Answer 1

并发集可能是解决方案:CopyOnWriteArraySet或 Collections.newSetFromMap( ConcurrentHashMap )，但鉴于我对您的问题的了解，很难说。