NS2下AODV协议aodv.cc注释

//#include

#include
#include
#include
#include
//#include

#define max(a,b) ( (a) > (b) (a) : (b) )
#define CURRENT_TIME Scheduler::instance().clock()

//#define DEBUG
//#define ERROR

#ifdef DEBUG
static int extra_route_reply = 0;
static int limit_route_request = 0;
static int route_request = 0;
#endif

/*
TCL Hooks
*/

int hdr_aodv::offset_;
static class AODVHeaderClass : public PacketHeaderClass {
public:
AODVHeaderClass() : PacketHeaderClass("PacketHeader/AODV",
sizeof(hdr_all_aodv)) {
bind_offset(&hdr_aodv::offset_);
}
} class_rtProtoAODV_hdr;
/*AODVclass 只有两个函数,构造函数和creat函数*/
static class AODVclass : public TclClass {
public:
AODVclass() : TclClass("Agent/AODV") {}
TclObject* create(int argc, const char*const* argv) {
assert(argc == 5);
//return (new AODV((nsaddr_t) atoi(argv[4])));
return (new AODV((nsaddr_t) Address::instance().str2addr(argv[4])));
}
} class_rtProtoAODV;

/*command函数实现了命令的分发*/
int
AODV::command(int argc, const char*const* argv) {
if(argc == 2) {//命令的参数个数是2
Tcl& tcl = Tcl::instance();

if(strncasecmp(argv[1], "id", 2) == 0) {//命令所要求的操作为id
tcl.resultf("%d", index);
return TCL_OK;
}

if(strncasecmp(argv[1], "start", 2) == 0) {//命令所要求的操作为start
btimer.handle((Event*) 0);

#ifndef AODV_LINK_LAYER_DETECTION
htimer.handle((Event*) 0);
ntimer.handle((Event*) 0);
#endif // LINK LAYER DETECTION

rtimer.handle((Event*) 0);
return TCL_OK;
}
}
else if(argc == 3) {//命令参数个数等于3
if(strcmp(argv[1], "index") == 0) {//命令所要求的操作为index
index = atoi(argv[2]);
return TCL_OK;
}
//命令所要求的操作为log-target或者tracetarget
else if(strcmp(argv[1], "log-target") == 0 || strcmp(argv[1], "tracetarget") == 0) {
logtarget = (Trace*) TclObject::lookup(argv[2]);
if(logtarget == 0)
return TCL_ERROR;
return TCL_OK;
}
else if(strcmp(argv[1], "drop-target") == 0)
{
//命令所要求的操作为drop-target
int stat = rqueue.command(argc,argv);
if (stat != TCL_OK) return stat;
return Agent::command(argc, argv);
}

//命令所要求的操作if-queue
else if(strcmp(argv[1], "if-queue") == 0) {
ifqueue = (PriQueue*) TclObject::lookup(argv[2]);

if(ifqueue == 0)
return TCL_ERROR;
return TCL_OK;
}
//命令所要求的操作为port-dmux
else if (strcmp(argv[1], "port-dmux") == 0) {
dmux_ = (PortClassifier *)TclObject::lookup(argv[2]);
if (dmux_ == 0) {
fprintf (stderr, "%s: %s lookup of %s failed\n", __FILE__,
argv[1], argv[2]);
return TCL_ERROR;
}
return TCL_OK;
}
}
return Agent::command(argc, argv);
}

/*
Constructor
*/

AODV::AODV(nsaddr_t id) : Agent(PT_AODV),
btimer(this), htimer(this), ntimer(this),
rtimer(this), lrtimer(this), rqueue() {


index = id;
seqno = 2;
bid = 1;

LIST_INIT(&nbhead);
LIST_INIT(&bihead);

logtarget = 0;
ifqueue = 0;
}