code: public void close()
    {
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
      	SibTr.entry(tc, "close");
      btmLockManager.lockExclusive();
      try
      {
        stopTimer();
        activeEntries = null;
      }
      finally
      {
        btmLockManager.unlockExclusive();
      }
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
      	SibTr.exit(tc, "close");
    }
docs: Method to close this timer forever