agent.h

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/* -*-  Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
 * Copyright (c) 1993-1997 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the Computer Systems
 *      Engineering Group at Lawrence Berkeley Laboratory.
 * 4. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 *
 * @(#) $Header: /nfs/jade/vint/CVSROOT/ns-2/common/agent.h,v 1.35 2002/12/22 16:43:24 sfloyd Exp $ (LBL)
 */

#ifndef ns_agent_h
#define ns_agent_h

#include "connector.h"
#include "packet.h"
#include "timer-handler.h"
#include "ns-process.h"
#include "app.h"
//#include "basetrace.h"
#define TIME_FORMAT "%.15g"
// TIME_FORMAT is in basetrace.h, but including that header leads to problems


#define TIMER_IDLE 0
#define TIMER_PENDING 1

/* 
 * Note that timers are now implemented using timer-handler.{cc,h}
 */

#define TRACEVAR_MAXVALUELENGTH 128

class Application;


// store old value of traced vars
// work only for TracedVarTcl
struct OldValue {
        TracedVar *var_;
        char val_[TRACEVAR_MAXVALUELENGTH];
        struct OldValue *next_;
};

class EventTrace;
class Agent : public Connector {
 public:
        Agent(packet_t pktType);
        virtual ~Agent();
        void recv(Packet*, Handler*);
        
        //added for edrop tracing - ratul
        void recvOnly(Packet *) {};

        void send(Packet* p, Handler* h) { target_->recv(p, h); }
        virtual void timeout(int tno);

        virtual void sendmsg(int sz, AppData*, const char* flags = 0);
        virtual void send(int sz, AppData *data) { sendmsg(sz, data, 0); }
        virtual void sendto(int sz, AppData*, const char* flags,
                            nsaddr_t dst);

        virtual void sendmsg(int nbytes, const char *flags = 0);
        virtual void send(int nbytes) { sendmsg(nbytes); }
        virtual void sendto(int nbytes, const char* flags, nsaddr_t dst);
        virtual void connect(nsaddr_t dst);
        virtual void close();
        virtual void listen();
        virtual void attachApp(Application* app);
        virtual int& size() { return size_; }
        inline nsaddr_t& addr() { return here_.addr_; }
        inline nsaddr_t& port() { return here_.port_; }
        inline nsaddr_t& daddr() { return dst_.addr_; }
        inline nsaddr_t& dport() { return dst_.port_; }
        void set_pkttype(packet_t pkttype) { type_ = pkttype; }
        inline packet_t get_pkttype() { return type_; }

 protected:
        int command(int argc, const char*const* argv);
        virtual void delay_bind_init_all();
        virtual int delay_bind_dispatch(const char *varName, const char *localName, TclObject *tracer);

        virtual void recvBytes(int bytes);
        virtual void idle();
        Packet* allocpkt() const;       // alloc + set up new pkt
        Packet* allocpkt(int) const;    // same, but w/data buffer
        void initpkt(Packet*) const;    // set up fields in a pkt

        ns_addr_t here_;                // address of this agent
        ns_addr_t dst_;                 // destination address for pkt flow
        int size_;                      // fixed packet size
        packet_t type_;                 // type to place in packet header
        int fid_;                       // for IPv6 flow id field
        int prio_;                      // for IPv6 prio field
        int flags_;                     // for experiments (see ip.h)
        int defttl_;                    // default ttl for outgoing pkts

#ifdef notdef
        int seqno_;             /* current seqno */
        int class_;             /* class to place in packet header */
#endif

        static int uidcnt_;

        Tcl_Channel channel_;
        char *traceName_;               // name used in agent traces
        OldValue *oldValueList_; 

        Application *app_;              // ptr to application for callback

        virtual void trace(TracedVar *v);
        void deleteAgentTrace();
        void addAgentTrace(const char *name);
        void monitorAgentTrace();
        OldValue* lookupOldValue(TracedVar *v);
        void insertOldValue(TracedVar *v, const char *value);
        void dumpTracedVars();

        /* support for event-tracing */
        EventTrace *et_;
        virtual void trace_event(char *eventtype){}

 private:
        void flushAVar(TracedVar *v);
};

#endif

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