Interview question

This is a very basic spring-boot app. Run it (using mvn spring-boot:run) or your favorite IDE. Try the url http://localhost:5000/greeting?name=David, it should return the string: "Hello David".

Requirements

Part one - Basic local service

We would like to create 2 APIs,

• one to store an array of numbers,
• one that returns a random permutation of that array.

Storage should be in memory without using any database.

Acceptance criteria

• Sending http://localhost:5000/store?numbers=2,1,3,4,6,5,7 should return an ID of the array (e.g., 1)
• Sending http://localhost:5000/permutation?id=1 should return a random permutation of the array (e.g., 2,3,6,7,1,3,5)

Part two - Adding persistence layer

We would like to have persistence of the data in case the server drops. application.yml is configured for H2 database, but feel free to use any other relational DB you are comfortable with to save the data. Make sure that your app will work with H2 as well as it will be tested with H2 (integartion-tests can help here).

Acceptance criteria

• Sending http://localhost:5000/store?numbers=2,1,3,4,6,5,7 should return an ID of the array (e.g., 1)
• Sending http://localhost:5000/permutation?id=1 should return a random permutation of the array (e.g., 2,3,6,7,1,3,5) Restarting the spring-boot app and Sending http://localhost:5000/permutation?id=1 should give back a random permutation of the array (e.g., 2,3,6,7,1,3,5)

Guidelines

• Fork this repository and push your commits
• Use the spring-boot template given
• Write unit-tests, integration-tests
  • Write in javadocs what scenarios are in test
  • Higher coverage is better
• Write code documentation
• All classes given are meant to used as reference - once they are not needed, they can be removed.
• This project uses lombok - use it when possible
• Properly organize your project with .gitignore file, readme file explaining how to run the project, etc.
• Do all 2 parts, and use git tags to mark the commit fulfilling part 1 and part 2.

Deliverables

• Send us a link to a repository fulfilling the requirements with two tags to check part 1 and 2.
• Your code will be tested using different tests.
• Successful implementation will move to interview.