if (db.op == op_dummy) { log.debug("op_dummy received");
if (log != null){ if (db.op == op_dummy) { log.debug("op_dummy received"); }
    private int nextOperation(isc_db_handle_impl db) throws IOException {        do {            db.op = db.in.readInt();            if (db.op == op_dummy) {                log.debug("op_dummy received");            }        } while (db.op == op_dummy);        return db.op;    }