Fault Tolerant Banking System Overview
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FAULT TOLERANT BANKING
SYSTEM
OVERVIEW
Project Goal
Project Description
Project Structure
Test Cases
Screenshots
PROJECT GOAL
This is a scenario where a user requests a
transaction to the bank database server. During
this transaction, if there is an error like database
server suddenly stops responding. Then, to
provide the service to the customer with out any
interference even if the server is down is the
main goal of this Fault Tolerant Banking System.
PROJECT DESCRIPTION
This project handles the situation where a user
requests for a transaction to the Bank Database
server, while the database is down.
This is done by using two databases which are
replicated.
That is, when one database is down we connect
the request to the other database and provide the
service to the user without any interruption or
fault.
PROJECT STRUCTURE
Firstly, I create two databases and replicated the
data in them.
After replicating, I created a JSP page which
consists of a HTML form which takes the data
from user and passes those parameter
correspondingly.
From Main page we move on to other JSP pages
(withdraw, deposit, check balance) where we
process the transaction as user requested.
Created some other JSP pages which handle the
exception in the code like if one database is down
We throw an exception and handle it in the
exception handler page by connecting to other
database complete the transaction.
TEST CASES
The Main page consists a part of code which syncs
the two databases every time when an update is
done to one of the tables.
Class.forName("oracle.jdbc.OracleDriver");
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:rani","system","usha");
Statement stm=null;
String rec="select * from customer minus select * from customer@link2";
Statement stmt2=null;
stmt2=con.createStatement();
Statement stm2=conn.createStatement();
int mod1= stm2.executeUpdate(re);
int mod=stmt2.executeUpdate(rec);
if(mod==1)
{
String rec1="update rani.customer set rani.customer.amount=orcl.customer.amount where rani.customer.acc_no=orcl.customer.acc_no ";
stmt=conn.createStatement();
stmt.executeUpdate(rec1);
}
if(mod1==1)
{
String rec1="update orcl.customer set orcl.customer.amount=rani.customer.amount where orcl.customer.acc_no=rani.customer.acc_no ";
stmt=con.createStatement();
stmt.executeUpdate(rec1);
}
%>
TEST CASES:
If during an operation, one of the database does not respond then we check whether the other database is used for further processing of operation or transaction.
<%@ page isErrorPage="true" import="java.io.*" %>
<%@page language="java" import="java.lang.*" import="java.sql.*" import="java.math.*"%>
<html>
<head>
<title> </title>
<style type="text/css">
body, p { font-family:Tahoma; font-size:10pt; padding-left:30; }
pre { font-size:8pt; }
</style>
</head>
<body>
<%
String str=request.getParameter("r1");
String account_no_1=request.getParameter("account_no");
int ID2=Integer.parseInt(account_no_1);
String amount_1=request.getParameter("amount");
int ID=Integer.parseInt(amount_1);
Class.forName("oracle.jdbc.OracleDriver");
Connection con= DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:rani","system","usha");
String rec="Update customer set amount= amount + "+ID+" where acc_no='"+ID2+"'";
Statement stmt=con.createStatement();
int mod=stmt.executeUpdate(rec);
if(mod==1)
{
%>
<script type="text/JavaScript">
alert("Deposit Completed Successfully");
document.write('account number:', +account_no_1,'updated with amount:', +id,'currently the balance in the account is:', +amount);
</script>
<%}%>
<%
con.commit();
stmt.close();
con.close();
%>
SCREENSHOTS
SCREENSHOT FOR DEPOSIT
SCREENSHOT FOR BALANCE CHECK
SCREENSHOT FOR WITHDRAW
SCREENSHOT BEFORE UPDATION IS DONE
SCREENSHOT AFTER DEPOSIT IS DONE
SCREENSHOT AFTER WITHDRAW
