/Users/yzchen/ns/ns-allinone-2.33/ns-2.33/queue/marker.h

/*
 * Copyright (c) 2000-2002, by the Rector and Board of Visitors of the 
 * University of Virginia.
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/*
 *                                                                     
 * Marker module for JoBS (and WTP).
 *                                                                     
 * Authors: Constantinos Dovrolis <dovrolis@mail.eecis.udel.edu>, 
 *          Nicolas Christin <nicolas@cs.virginia.edu>, 2000-2002       
 *                                                                    
 * $Id: marker.h,v 1.1 2003/02/02 22:18:22 xuanc Exp $
 */
#ifndef MARKER_H
#define MARKER_H

#define NO_CLASSES 4    // This number cannot be changed 
                        // w/o modifying the code. 
                        // This is, again, a prototype 
                        // implementation...
#define DETERM 1        // Deterministic marker: all traffic is marked with 
                        // given class (marker_class_)
#define STATIS 2        // Probabilistic marker: class-marking follow given
                        // (cumulative) distribution

class Marker: public Queue {
public:
        Marker();
        virtual int command(int argc, const char*const* argv); 
        void    enque(Packet*);
        Packet* deque();
        double  marker_arrvs_[NO_CLASSES+1];    // For monitoring purposes
protected:
        int     marker_type_;                   // Marker type 
        double  marker_frc_[NO_CLASSES+1];      // Class-marking fractions 
                                                // (STATIS)
                                                // marker_frc_ represent the 
                                                // *cumulative* marking distribution
        int     marker_class_;                  // Fixed class marking (DETERM)
        PacketQueue     *q_;                    // Underlying FIFO queue 
        int     rn_seed_;                       // Random seed
};

#endif /* MARKER_H */