/** {@inheritDoc} */
  @Override
  public void spiStop() throws GridSpiException {
    unregisterMBean();

    // Reset events.
    evts.clear();

    // Ack ok stop.
    if (log.isDebugEnabled()) log.debug(stopInfo());
  }
 /** {@inheritDoc} */
 @Override
 public void clearAll() {
   evts.clear();
 }