classifier-mpath.cc

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/* -*-  Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */

/*
 * Copyright (C) 1997 by the University of Southern California
 * $Id: classifier-mpath.cc,v 1.10 2005/08/25 18:58:01 johnh Exp $
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 *
 *
 * The copyright of this module includes the following
 * linking-with-specific-other-licenses addition:
 *
 * In addition, as a special exception, the copyright holders of
 * this module give you permission to combine (via static or
 * dynamic linking) this module with free software programs or
 * libraries that are released under the GNU LGPL and with code
 * included in the standard release of ns-2 under the Apache 2.0
 * license or under otherwise-compatible licenses with advertising
 * requirements (or modified versions of such code, with unchanged
 * license).  You may copy and distribute such a system following the
 * terms of the GNU GPL for this module and the licenses of the
 * other code concerned, provided that you include the source code of
 * that other code when and as the GNU GPL requires distribution of
 * source code.
 *
 * Note that people who make modified versions of this module
 * are not obligated to grant this special exception for their
 * modified versions; it is their choice whether to do so.  The GNU
 * General Public License gives permission to release a modified
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 */

#ifndef lint
static const char rcsid[] =
    "@(#) $Header: /nfs/jade/vint/CVSROOT/ns-2/classifier/classifier-mpath.cc,v 1.10 2005/08/25 18:58:01 johnh Exp $ (USC/ISI)";
#endif

#include "classifier.h"

class MultiPathForwarder : public Classifier {
public:
    MultiPathForwarder() : ns_(0) {} 
    virtual int classify(Packet*) {
        int cl;
        int fail = ns_;
        do {
            cl = ns_++;
            ns_ %= (maxslot_ + 1);
        } while (slot_[cl] == 0 && ns_ != fail);
        return cl;
    }
private:
    int ns_;
};

static class MultiPathClass : public TclClass {
public:
    MultiPathClass() : TclClass("Classifier/MultiPath") {} 
    TclObject* create(int, const char*const*) {
        return (new MultiPathForwarder());
    }
} class_multipath;

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