private void heartBeat(){
  try {
    Long newHeartBeat=System.currentTimeMillis();
    dataManager.putData(getHeartBeatPath(uniqueId),newHeartBeat);
  }
 catch (  Exception e) {
    log.error("Error updating Engine " + uniqueId + " HeartBeat",e);
  }
}

private void heartBeat ( ) { try { Long newHeartBeat = System . currentTimeMillis ( ) ; dataManager . putData ( getHeartBeatPath ( uniqueId ) , newHeartBeat ) ; } catch ( Exception e ) { log . error ( "Error updating Engine " + uniqueId + " HeartBeat" , e ) ; } }
sends a heartbeat for this engine .
