srikarrao/revolut-banking

Revolut Coding Exercise

Revolut Banking (Money Transfer API)

Revolut Coding Exercise

Prerequisites

• Java JDK 11

Steps To Execute

• Run ./gradlew clean build or gradlew.bat clean build
• If above step fails, please use the revolut-banking-0.0.1-SNAPSHOT.zip from distributions folder.
• Go to build/distributions and unpack revolut-banking-0.0.1-SNAPSHOT.zip
• Go to revolut-banking-0.0.1-SNAPSHOT/bin and run there ./revolut-banking or revolut-banking.bat.
• Open http://localhost:8080/ping in your browser to get the pong message
• Use below endpoints to execute/test the API using Postman/SoapUI tool

Build Failover Recovery

• Please foll

REST API

Get Account Endpointurl

http://localhost:8080/v1/accounts/802909
Status: 200 OK
Method: GET

Get Account Response

{
    "status": 200,
    "data": {
        "accNumber": 802909,
        "balance": 130
    }
}

Transfer Amount Endpointurl

http://localhost:8080/v1/transfers
Status: 200 OK
Method: POST

Transfer Amount Request

{
    "amount": 10.00,
    "fromAccount": 137985,
    "toAccount": 802909
}

Transfer Amount Response

{
    "status": 200,
    "data": {
        "accNumber": 137985,
        "balance": 1010
    }
}

Create Account Endpointurl

http://localhost:8080/v1/accounts
Status: 200 OK
Method: POST

Create Account Request

{
	"balance":120.12
}

Create Account Response

{
    "status": 200,
    "data": {
        "accNumber": 802909,
        "balance": 120.12
    }
}

Technologies Used

• Spark Java Rest Framework: For exposing REST API endpoints. Has a bug in framework for trailing '/' in the endpoint url. Tried intercepting the request and changing the resourcePath. Didn't worked. For this application standard is no trailing '/' in the resource URI. Used default Jetty http server.
• Wix-Embedded-MySql: Used this to store the account details. The schema is pre-built during application bootstrap using DB_INIT_SCRIPT.sql.. Used ENGINE=MEMORY which provides in-memory SQL database.

NOTE: ENGINE=INNODB provides ACID transaction support, with ENGINE=MEMORY is is not transaction strong. Being in-memory, the data will be lost once the MySql process is terminated.

• Sql2o Database Client: Used this framework as an alerantive to JDBC, Hibernate, Spring JPA. Performance metrics are favorable with speed.
• Used Mockito & Junit for Unit Testing.
• Gradle as build management tool.
• Java Version 11. Though didn't get any use case to use its latest features.