1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/* -*- Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
* Copyright (c) Xerox Corporation 1997. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* 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.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linking this file statically or dynamically with other modules is making
* a combined work based on this file. Thus, the terms and conditions of
* the GNU General Public License cover the whole combination.
*
* In addition, as a special exception, the copyright holders of this file
* give you permission to combine this file 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
* file 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 file 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 version without this exception;
* this exception also makes it possible to release a modified version
* which carries forward this exception.
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /cvsroot/nsnam/ns-2/tools/expoo.cc,v 1.15 2005/08/26 05:05:30 tomh Exp $ (Xerox)";
#endif
#include <stdlib.h>
#include "random.h"
#include "trafgen.h"
#include "ranvar.h"
/* implement an on/off source with exponentially distributed on and
* off times. parameterized by average burst time, average idle time,
* burst rate and packet size.
*/
class EXPOO_Traffic : public TrafficGenerator {
public:
EXPOO_Traffic();
virtual double next_interval(int&);
virtual void timeout();
// Added by Debojyoti Dutta October 12th 2000
int command(int argc, const char*const* argv);
protected:
void init();
double ontime_; /* average length of burst (sec) */
double offtime_; /* average length of idle time (sec) */
double rate_; /* send rate during on time (bps) */
double interval_; /* packet inter-arrival time during burst (sec) */
unsigned int rem_; /* number of packets left in current burst */
/* new stuff using RandomVariable */
ExponentialRandomVariable burstlen_;
ExponentialRandomVariable Offtime_;
};
static class EXPTrafficClass : public TclClass {
public:
EXPTrafficClass() : TclClass("Application/Traffic/Exponential") {}
TclObject* create(int, const char*const*) {
return (new EXPOO_Traffic());
}
} class_expoo_traffic;
// Added by Debojyoti Dutta October 12th 2000
// This is a new command that allows us to use
// our own RNG object for random number generation
// when generating application traffic
int EXPOO_Traffic::command(int argc, const char*const* argv){
if(argc==3){
if (strcmp(argv[1], "use-rng") == 0) {
burstlen_.seed((char *)argv[2]);
Offtime_.seed((char *)argv[2]);
return (TCL_OK);
}
}
return Application::command(argc,argv);
}
EXPOO_Traffic::EXPOO_Traffic() : burstlen_(0.0), Offtime_(0.0)
{
bind_time("burst_time_", &ontime_);
bind_time("idle_time_", Offtime_.avgp());
bind_bw("rate_", &rate_);
bind("packetSize_", &size_);
}
void EXPOO_Traffic::init()
{
/* compute inter-packet interval during bursts based on
* packet size and burst rate. then compute average number
* of packets in a burst.
*/
interval_ = (double)(size_ << 3)/(double)rate_;
burstlen_.setavg(ontime_/interval_);
rem_ = 0;
if (agent_)
agent_->set_pkttype(PT_EXP);
}
double EXPOO_Traffic::next_interval(int& size)
{
double t = interval_;
if (rem_ == 0) {
/* compute number of packets in next burst */
rem_ = int(burstlen_.value() + .5);
/* make sure we got at least 1 */
if (rem_ == 0)
rem_ = 1;
/* start of an idle period, compute idle time */
t += Offtime_.value();
}
rem_--;
size = size_;
return(t);
}
void EXPOO_Traffic::timeout()
{
if (! running_)
return;
/* send a packet */
// The test tcl/ex/test-rcvr.tcl relies on the "NEW_BURST" flag being
// set at the start of any exponential burst ("talkspurt").
if (nextPkttime_ != interval_ || nextPkttime_ == -1)
agent_->sendmsg(size_, "NEW_BURST");
else
agent_->sendmsg(size_);
/* figure out when to send the next one */
nextPkttime_ = next_interval(size_);
/* schedule it */
if (nextPkttime_ > 0)
timer_.resched(nextPkttime_);
}
|
