Sheet Sharing

Frameworks Used

• Kotlin
• Ktor (Framework for building asynchronous servers and clients in connected systems using kotlin)
• Koin (Dependency Injection)
• jetbrains exposed
• H2 db as inmemory data storage
• uchuhimo (for Config)
• Flyway (For database migration)

Reasons to choose the frameworks

I wanted to illustrate the idea i discussed during the initial interview regarding using frameworks other than Spring Umbrella. That's why I Used Ktor , Koin , exposed which give better performance for small services Choosing of H2 to Facilitate the reviewer testing , so no need to have pre-installed DBMS (Plug & Play :) ) and as well Flyway. No need to worry about Configurations. Everything can be done through the package manager. (P.S.) As H2 is in memory DB , so once teh server is being shut down , all the data will be lost. but it will help you to play around the service. Change app config for other DBMS, (it's one line change)

Data Model Concept

As General Concept , The service is expecting to receive selections that should be stored along with for whom are those changes are intended and because the service is intermediate service , it doesn't need to store full not needed data, so the following entities are considered:

Sharing :

• Selection (The Intended Share that should be visible to users)
• Sheet (it would be better for FE to have this info. )
• CreatedAt

Recipient Sharing:

• rec-email ( it should be anonlymized for GDBR reasons)
• Sharing Id

So when saving Sharings , data will be saved on those two tables , upon retrieval , a complete model of sharings and associated recipient will be formed and returned to client

How to start?

• Please Generate self contained Jar (gradle clean build is good option :D )

• Start the server by java -jar build/libs/Layer.jar

• OR (Smart Docker ;) , Build Docker image : docker build -t layer . and Run it : docker run -p 8080:8080 layer

• Use Curl or Insomnia (it's cool) to trigger your calls

• Code is covered by Tests (Please approach me for clarifications)-(hit ./gradlew test will not bite :D)

• Hint , Use the following Endpoints to navigate (Don't worry you are almost covered)

  GET   "/api/shares"                            -> list all sharings with associated recipients
  GET   "/api/shares/recipient/{recipient}"      -> retrieve recipient sharings
  GET   "/api/shares/{id}"                       -> retrieve sharing by id
  POST  "/api/shares"                            -> create new sharings
  

For Concurrency :

I want to add Concurrency according to the following Article if time was sufficient
https://blog.mindorks.com/mastering-kotlin-coroutines-in-android-step-by-step-guide (It's very cool illustration of concurrency in kotlin coroutines)