ATM Account State Machine Implementation

This assignment is about implementing an ATM system using a decentralized state machine approach. The system has three states: Start, Idle, and Ready. The Start state initializes the account, the Idle state handles PIN verification and opening of the account, while the Ready state handles depositing, withdrawing, and checking balance. The system also has methods for logging out, suspending, activating, and closing the account. A sequence diagram is provided for a specific operation sequence: OPEN(123,111,1000), LOGIN(111), PIN(123), DEPOSIT(200), BALANCE(), suspend(), close.

Contents
Decentralized...................................................................................................................................2
Class Diagram..............................................................................................................................2
Sequence Diagram.....................................................................................................................10

Decentralized
Class Diagram

Class Account:
S// point to current state
LS[0] // point to start state
LS[1] // point to idle state
LS[2] // point to ready state
Operations:
create(){
S->create()
}
Open(int p, int y, int a){
S->open(p,y,a);
}
Pin(int p){
S->pin(p)
}

Deposit(int d){
S->deposit(d);
}
Withdraw(int y){
S->withdraw(y);
}

Balance(){
S->balance()
}
Logout(){
S->logout()
}
Suspend(){
S->suspend()
}
activated(){
S->activated()
}
Close(){
S->close()
}
Class AccountData:

setPin(int pincode){
pin = pincode
}
Deposit(int d){
Balance = balance + d
}
withdraw(int w){
Balance = balance - w;
}
Balance(){
Return balance;
}
setAccountStatus(String status){
accountStatus = status;
}
Class “ATMState”: all methods are abstract methods in this class
Class “Start”

create(){
Account -> changeState(1)
}
Class “Idle”
pin(int p){
ad->setPin(p)
account->changeState(2)
}
open(int p,int y,int a){
ad->setPin(p)
ad->setIdentification(y)
ad->setBalance(a)
}
login(int y){
ad->setIdentification(y)
account->changeState(2)
}
Class “Ready”
Deposit(int d){
Ad.setBalance(ad.getBalance() + d);
}
Withdraw(int y){
Ad.setBalance(ad.getBalance() - w);
}

Balance(){
Return ad.balance();
}
Logout(){
Account.changeState(1)
}
Suspend(){
Ad.setAccountStatus(“suspend”);
}
activated(){
Ad.setAccountStatus(“activated”);
}
Close(){
Account.changeState(1)

}
Sequence Diagram
Provide a sequence diagram for the following operation sequence:
OPEN(123,111,1000), LOGIN(111), PIN(123), DEPOSIT(200), BALANCE(),
suspend(), close.