@Override
  public boolean cancel(boolean mayInterruptIfRunning) {
	this.lock.lock();
	try {
	  if (this.completed) {
		return false;
	  }
	  this.completed = true;
	  this.cancelled = true;
	  this.condition.signalAll();
	  return true;
	} finally {
	  this.lock.unlock();
	}
  }
@ Override public boolean cancel ( boolean mayInterruptIfRunning ) { this . lock . lock ( ) ; try { if ( this . completed ) { return false ; } this . completed = true ; this . cancelled = true ; this . condition . signalAll ( ) ; return true ; } finally { this . lock . unlock ( ) ; } }
{@inheritDoc}