The Asset Management Digital Challenge

Transfer Money Between Two Accounts

This is a simple REST API service which handles money transactions between two accounts. Project is build with gradle based on SpringBoot, Spring MVC, Lombok. JUnit 4 and AssertJ frameworks are used for testing.

Components of the System

1. Account Service serves Account based functions to create and read accounts and perform credit/debit operations.

Parameters of Account object:

• accountID: Unique ID of account
• balance: Available account funds

Classes of Account service:

• Account model
• AccountsRepositoryInMemory in memory repository holds Account objects
• AccountsService service component
• AccountController REST Controller component

2. Transfer Service serves money transfer between two account.

Parameters of transfer object:

• accountFrom: Source account
• accountTo : Destination account
• amount : amount to transfer from accountFrom to accountTo.

Classes of Transfer service:

• Transfer model
• TransfersRepositoryInMemory in memory repository holds Transfer objects per Account.
• TransferService-service component
• TransferController-REST Controller component
• EmailNotificationService-sends notification mails both accounts if the transaction committed.

Tech Stack Used:

• Java 8
• Gradle
• Spring Boot
• Spring MVC
• JUnit 4 is used for testing (Over 90% coverage).

Data Storage:

• Accounts in transfer operation are synchronized in their Id order to avoid deadlock.
• ConcurrentHashMap is used to support thread-safe storage for Accounts.

How to Run Tests:

1. Commandline:

• gradle(w) test

2. IDE (IntelliJ or Eclipse)

• Open project
• Run Tests in DWSTest (IntelliJ)
• Run As > JUnit Test (Eclipse)