...
private Filter outFilter = new outgoingLoggingFilter();
...
public Filter getCommandFilter(boolean direction) {
  if (direction == OUTGOING) {
    return outFilter;
  }
  else {
    return null;
  }
}
...
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];
      System.out.println("Message from "+sender+" to "+receiver+:");
      if (verbose) {
        System.out.println (msg) ;
      }
      else {
        System.out.println(ACLMessage.getPerformative(msg.getPerformative()));
      }
    }
    // Never block a command
    return true;
  }
}