...
private class LoggingSliceImpl implements Service.Slice {

  public Service getService() {
    return LoggingService.this;
  }

  public Node getNode() throws ServiceException {
    try {
      return LoggingService.this.getLocalNode() ;
    }
    catch (IMTPException imtpe) {
      // Should never happen as this is a local call
      throw new ServiceException("Unexpected error retrieving local node") ;
    }
  }

  public VerticalCommand serve (HorizontalCommand cmd) {
    if (cmd.getName().equals(LoggingSlice.H_LOGMESSAGE)) {
      Object[] params = cmd.getParams() ;
      System.out.println(params [0]) ;
    }
  }
}
...

================================================

...
private ServiceSlice localSlice = new LoggingSliceImpl() ;
...
public Class getHorizontalInterface() {
  return LoggingSlice.class;
}

public Service.Slice getLocalSlice() {
  return localSlice;
}
...

================================================

...
private class OutgoingLoggingFilter extends Filter {
  public boolean accept (VerticalCommand cmd) {
    if (cmd.getName().equals (MessagingSlice.SEND_MESSAGE)) {
      Object[] params = cmd.getParams() ;
      AID sender = (AID) params [0] ;
      GenericMessage gMsg = (GenericMessage) params[1] ;
      ACLMessage msg = gMsg.getACLMessage() ;
      AID receiver = (AID) params[2] ;
      // Prepare the log record
      String logRecord = "Message from "+sender+" to "+receiver+": \n" ;
      if (verbose) {
        logRecord = logRecord+msg;
      }
      else {
        logRecord = logRecord+ACLMessage.getPerformative(msg.getPerformative());
      }

      // Send the log record to the logging slice on the Main Container
      try {
        LoggingSlice mainSlice = (LoggingSlice) getSlice(MAIN_SLICE) ;
        mainSlice.logMessage (logRecord) ;
      }
      catch (ServiceException se) {
        System.out.println("Error retrieving Main LoggingSlice") ;
        se.printStackTrace() ;
      }
      catch (IMTPException impte) {
        System.out.println("Error contacting Main LoggingSlice") ;
        se.printStacktrace() ;
      }
    }
    // Never block a command
    return true;
  }
}