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this programming assignment you are to implement a Centralized Multi-User Concurrent Bank Account Manager. The system has two important components.

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this programming assignment you are to implement a Centralized Multi-User Concurrent

Bank Account Manager. The system has two important components.

  • Bank Server: The server program that services online requests for account

manipulations and maintains all customer records correctly.

  • Clients: Customers are clients of the bank server and use its services to update bank

accounts. The operations that can be performed on an account are: withdrawal of an

amount from an account and deposit of an amount into an account. Additionally, the

bank server can have it's own service that periodically deposits an interest amount to each

account based on some fixed rate.

A pictorial representation of the system is as shown in the figure below.

The components of the system and their functionalities to be implemented are as follows:

Server

The server receives queries from customers (ATM clients, Clients/Billing agencies performing

online transactions etc.) for operations on accounts. The server should have the following

functionalities:

  • Should be able to accept multiple concurrent customer requests (i.e., must be multi-

threaded)

  • It should provide locking/protection for access to an account records during shared

access (i.e., a user might be depositing money into his account and at the same time an

online billing agent might be withdrawing money from the same account). Such cases

need to be correctly handled by protecting variables in the critical section.

  • Maintain correctness of records at each record, (i.e., allow withdrawal from an account

only if it has sufficient funds etc.)

  • To create a set of records at the server initially, you can use an input file that the server

reads and creates account information. You can generate your own input file. For testing we will use our own file. However, name the file Records.txt.

An example input file format could be:

101 Peter 160

102 John 1200

103 Gambo 11000

.

The format for each line being: account number, name, balance amount (space separated)

Client

A client issues requests to the server from a transaction based on account numbers. Client

functionality:

  • Issue withdrawal or deposit requests.
  • For ease of testing and to make experiments bigger, the clients can issue requests at fixed

time intervals. A client can read an input file for transaction information and perform

those tasks accordingly. For example, following is a format you can use to generate input

for each client and use it in experiments. Create your own file. However, call it

Transactions.txt.

10 01 w 200

25 01 d 300

26 05 d 150

.

Each line of the input file is a transaction request to be issued by the client and has the

following format: timestamp, account number, transaction type(withdrawal/deposit),

amount (space separated)

  • Should receive status of transaction from server and print or log status for each.

The purpose of this assignment is to get you familiarized with sockets, processes, threads and

synchronization.

You can be creative with this project (like add create new online accounts, which means add new

functionalities, other than mentioned above, at both client and server etc.).

Constraints on the Implementation

  • You must use C++ for implementing this project (therefore, your source files should have

extensions of .cc or .cpp. You are welcome to use the STL classes). You must test your

code on a linux machine/machines. Testing it on a Windows and/or Unix (MAC)

machine is not acceptable.

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