// Starts the simulation. It will end when no more packets are in the
// medium
public void runSimulator() {
Event next;
Packet p;
while (true) {
next = eventList.removeNext();
if (next == null) {
break;
}
if (traceLevel > 1) {
System.out.println();
System.out.println(
"main(): event received. t=" + next.getTime() + ", node=" + next.getEntity());
if (next.getType() == FROMLAYER2) {
p = next.getPacket();
System.out.print(" src=" + p.getSource() + ", ");
System.out.print("dest=" + p.getDest() + ", ");
System.out.print("contents=[");
for (int i = 0; i < NUMENTITIES - 1; i++) {
System.out.print(p.getMincost(i) + ", ");
}
System.out.println(p.getMincost(NUMENTITIES - 1) + "]");
} else if (next.getType() == LINKCHANGE) {
System.out.println(" Link cost change.");
}
}
time = next.getTime();
if (next.getType() == FROMLAYER2) {
p = next.getPacket();
if ((next.getEntity() < 0) || (next.getEntity() >= NUMENTITIES)) {
System.out.println("main(): Panic. Unknown event entity.");
} else {
entity[next.getEntity()].update(p);
}
} else if (next.getType() == LINKCHANGE) {
if (time < 10001.0) {
cost[0][1] = 20;
cost[1][0] = 20;
entity[0].linkCostChangeHandler(1, 20);
entity[1].linkCostChangeHandler(0, 20);
} else {
cost[0][1] = 1;
cost[1][0] = 1;
entity[0].linkCostChangeHandler(1, 1);
entity[1].linkCostChangeHandler(0, 1);
}
} else {
System.out.println("main(): Panic. Unknown event type.");
}
}
System.out.println("Simulator terminated at t=" + time + ", no packets in medium.");
}
/**
* ** Warning! This will allow an entity to send packets that they couldn't possibly send (e.g.
* Entity 1 could send a packet from 0 to 3). This should be fixed later... ***
*/
public static void toLayer2(Packet p) {
Packet currentPacket;
double arrivalTime;
if ((p.getSource() < 0) || (p.getSource() >= NUMENTITIES)) {
System.out.println("toLayer2(): WARNING: Illegal source id in " + "packet; ignoring.");
return;
}
if ((p.getDest() < 0) || (p.getDest() >= NUMENTITIES)) {
System.out.println("toLayer2(): WARNING: Illegal destination id " + "in packet; ignoring.");
return;
}
if (p.getSource() == p.getDest()) {
System.out.println(
"toLayer2(): WARNING: Identical source and " + "destination in packet; ignoring.");
return;
}
if (cost[p.getSource()][p.getDest()] == 999) {
System.out.println(
"toLayer2(): WARNING: Source and destination " + "not connected; ignoring.");
return;
}
if (traceLevel > 2) {
System.out.println("toLayer2(): source=" + p.getSource() + " dest=" + p.getDest());
System.out.print(" costs:");
for (int i = 0; i < NUMENTITIES; i++) {
System.out.print(" " + p.getMincost(i));
}
System.out.println();
}
arrivalTime = eventList.getLastPacketTime(p.getSource(), p.getDest());
if (arrivalTime == 0.0) {
arrivalTime = time;
}
arrivalTime = arrivalTime + 1.0 + (rand.nextDouble() * 9.0);
if (traceLevel > 2) {
System.out.println("toLayer2(): Scheduling arrival of packet.");
}
currentPacket = new Packet(p);
eventList.add(new Event(arrivalTime, FROMLAYER2, currentPacket.getDest(), currentPacket));
}