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Problem One - ATM

This is a solution to the task "PROBLEM_1_ATM.md" - CLI to simulate an interaction of an ATM with retail bank.

Build jar

mvn compile assembly:single

Result: target/console_atm.jar

Run program

java -jar console_atm.jar or using IDE - just run com.okabanov.atm.Application.main

Press Ctrl D to exit.

Run unit tests

mvn tests

Solution Analysis

Libraries

The project doesn't use any third party libraries for runtime. But will be good idea to use:

  • spring-shell - for CLI autocomplete, suggestions and validations
  • spring - for DI, if the application will have huge amount of services

Improvements

  • The @Transactional annotation is a mock for real transaction in DB
  • The deposit command should select the target account if there are two or more debts
  • The login command should also perform authentication (with password and storing SESSION_ID)
  • Services must send CRUD operations to the bank server
  • The application must provide a unique ID for each request to avoid repeating the request over the network (mobile operators may repeat the full request)