/**
* This method sends an ATM cell containing 'setup' and an address to the router
*
* @param toAddress the address we want to connect to
* @since 1.0
*/
public void setupConnection(int toAddress) {
// Create the ATM cell to send
ATMCell conn = new ATMCell(0, "setup " + toAddress, this.getTraceID());
conn.setIsOAM(true);
// Output to the console
this.sentSetup(conn);
// send the cell
this.nic.sendCell(conn, this);
}
/**
* This method sends an ATM cell saying that we want to end the VC that we currently have open
* Currently each computer can only have one VC, but the routers can have many VC open
*
* @since 1.0
*/
public void endConnection() {
if (this.vcNumber < 0) return;
// Create the ATM cell to send
ATMCell end = new ATMCell(this.vcNumber, "end " + this.vcNumber, this.getTraceID());
end.setIsOAM(true);
// Output to the console
this.sentEnd(end);
this.vcNumber = -1;
// Send the cell
this.nic.sendCell(end, this);
}
/**
* Outputs to the console that a call proceeding message has been received
*
* @since 1.0
* @version 1.2
*/
private void receivedCallProceeding(ATMCell cell) {
System.out.println(
"REC CALLPRO: Computer "
+ address
+ " received a call proceeding message "
+ cell.getTraceID());
}
/**
* This method processes cells that are received from the nic
*
* @param cell the cell that was received
* @param nic the nic the cell was received on
* @since 1.0
*/
public void receiveCell(ATMCell cell, ATMNIC nic) {
if (cell.getIsOAM()) {
String data = cell.getData();
if (data.startsWith("callpro")) {
this.receivedCallProceeding(cell);
} else if (data.startsWith("conn")) {
this.receivedConnect(cell);
int vcNum = this.getIntFromEndOfString(data);
this.vcNumber = vcNum;
System.out.println("The connection is setup on VC " + this.vcNumber);
// send connect ack
ATMCell callackCell = new ATMCell(0, "callack", this.getTraceID());
callackCell.setIsOAM(true);
nic.sendCell(callackCell, this);
this.sentConnectAck(callackCell);
} else if (data.startsWith("endack")) {
this.receivedEndAck(cell);
} else if (data.startsWith("wait")) {
this.receivedWait(cell);
// send setup again
int destAddr = this.getIntFromEndOfString(data);
ATMCell setupCell = new ATMCell(0, "setup " + destAddr, this.getTraceID());
setupCell.setIsOAM(true);
nic.sendCell(setupCell, this);
this.sentSetup(setupCell);
}
} else {
}
}
/**
* Outputs to the console that a connect ack message has been sent
*
* @since 1.2
*/
private void sentConnectAck(ATMCell cell) {
System.out.println(
"SND CALLACK: Computer " + address + " sent a connect ack message " + cell.getTraceID());
}
/**
* Outputs to the console that a wait message has been received
*
* @since 1.0
* @version 1.2
*/
private void receivedWait(ATMCell cell) {
System.out.println(
"REC WAIT: Computer " + address + " received a wait message " + cell.getTraceID());
}
/**
* Outputs to the console that an end message has been received
*
* @since 1.0
* @version 1.2
*/
private void receivedEndAck(ATMCell cell) {
System.out.println(
"REC ENDACK: Computer " + address + " received an end ack message " + cell.getTraceID());
}
/**
* Outputs to the console that an end message has been received
*
* @since 1.0
* @version 1.2
*/
private void sentEnd(ATMCell cell) {
System.out.println(
"SND END: Computer " + address + " sent an end message " + cell.getTraceID());
}
/**
* Outputs to the console that a connect message has been received
*
* @since 1.0
* @version 1.2
*/
private void receivedConnect(ATMCell cell) {
System.out.println(
"REC CONN: Computer " + address + " received a connect message " + cell.getTraceID());
}
/**
* Outputs to the console that a connect message has been sent
*
* @since 1.0
* @version 1.2
*/
private void sentSetup(ATMCell cell) {
System.out.println(
"SND SETUP: Computer " + address + " sent a connect setup " + cell.getTraceID());
}