private void processEvent(Sim_event ev)
    {
        switch ( ev.get_tag() )
        {
            case GridSimTags.PKT_FORWARD: // for normal packets
            case GridSimTags.JUNK_PKT:    // for background traffic
                enque(ev);
                break;

            case GridSimTags.INSIGNIFICANT:
                processInternalEvent();
                break;

            default:
                System.out.println(super.get_name() + ".body(): Warning - " +
                        "unable to handle request from GridSimTags " +
                        "with constant number " + ev.get_tag());
                break;
        }
    }