@Override
  public void init(Configuration conf) {
    if (conf == null) {
      throw new ServiceStateException("Cannot initialize service "
                                      + getName() + ": null configuration");
    }
    if (isInState(STATE.INITED)) {
      return;
    }
    synchronized (stateChangeLock) {
      if (enterState(STATE.INITED) != STATE.INITED) {
        setConfig(conf);
        try {
          serviceInit(config);
          if (isInState(STATE.INITED)) {
            //if the service ended up here during init,
            //notify the listeners
            notifyListeners();
          }
        } catch (Exception e) {
          noteFailure(e);
          ServiceOperations.stopQuietly(LOG, this);
          throw ServiceStateException.convert(e);
        }
      }
    }
  }