A java spring-boot based REST application to handle stocks based CRUD operations with some locking techniques to prevent short time stock data manipulation. It is a minimal Proof of concept that adheres to the requirements mentioned in Here

• Employing test driven development practice while building application - Each module goes through the red -> fix -> green -> refactor cycle
• Intensive unit tests - Mocktio based unit tests to observe interactions of various actors
• Separation of concerns - Modular approach on top of MVC paradigm in giving specific responsibility to each module in the application
  • Persistence layer powered by jpa/hibernate libraies taking care of the data persistence with simplified ORM capabilities mapping to relational entities.
  • Service layer to handle data persistence and business logics required to invoke the what3words api with the location data supplied
  • Controller to handle all the endpoint calls to process the data from users.
  • Models to keep track of data that is processed by the system.
  • ControllerAdvice to handle all the user defined exceptions handled at the runtime to send proper response code to users to better understand the flow.
• Dependency resolution with Spring-Boot's Auto-configuration and dependency resolution.
• MVC test to support integration testing of the entire Spring Application.
• Lombok - used annotation based pre-processing to reduce a lot of boilerplate code that can be deferred to compile time.
• H2 in memory data base along with the persistence capabilities in java/spring-boot to enable in-memory data management.
• Minimal UI : Single page UI with the stock CRUD operations created using jQuery UI with essential aspects with javascript and css. With my very minimal knowledge on styling and css I used jQuery UI to create a simpler app in a really limited amount of time.

POST /api/stocks HTTP/1.1
Host: localhost:8080
Content-Type: application/json

{
     "name":"PCNQ",
     "currentPrice": 12.45
}

name – the name of the company stock in the system. currentPrice - the price of that particular stock.

Returns: The created stock object with reference details.

200 – in case of success 400 – if the request is missing the name or invalid price. 208 – if the name given to update is found in system for other stock. 422 – if one of the fields sent is empty or wrong. 403 - if the request is to update/delte the stock within the lock window.

HTTP/1.1 201 Created
Content-Type: application/json

{
    "id": 1,
    "name": "PCNQ",
    "currentPrice": 12.45,
    "timeCreated": 1636817934,
    "lastUpdated": 1636817934
}

OR

HTTP/1.1 208 Already reported
Content-Type: application/json

OR

HTTP/1.1 422 Unprocessable Entity
Content-Type: application/json

{
    "message": "Invalid request data passed!"
}

Returns: The created stock object with reference details.

200 – in case of success 204 – if the given id is not in the system.

GET /api/stocks/1 HTTP/1.1
Host: localhost:8080

{
    "id": 1,
    "name": "PCNQ",
    "currentPrice": 12.45,
    "timeCreated": 1636817934,
    "lastUpdated": 1636817934
}

OR

HTTP/1.1 204 No content
Content-Type: application/json

Returns: The list of created stock objects with reference details. 200 – in case of success

GET /api/stocks/ HTTP/1.1
Host: localhost:8080

[{
    "id": 1,
    "name": "PCNQ",
    "currentPrice": 12.45,
    "timeCreated": 1636817934,
    "lastUpdated": 1636817934
},{
    "id": 2,
    "name": "ADYN",
    "currentPrice": 45.87,
    "timeCreated": 1636817934,
    "lastUpdated": 1636817934
}]

Returns: The created stock object with reference details.

200 – in case of success 204 – if the given id is not in the system. 403 - if the request is to update/delete the stock within the lock window.

DELTE /api/stocks/1 HTTP/1.1
Host: localhost:8080

{
    "id": 1,
    "name": "PCNQ",
    "currentPrice": 12.45,
    "timeCreated": 1636817934,
    "lastUpdated": 1636817934
}

OR

HTTP/1.1 204 No content
Content-Type: application/json

OR

HTTP/1.1 402 Forbidden
Content-Type: application/json

{
    "message": "Cannot manipulate stock within Lock window!"
}

PUT /api/stocks/1 HTTP/1.1
Host: localhost:8080
Content-Type: application/json

{
     "name":"PCNQ2",
     "currentPrice": 23.32
}

name – the name of the company stock in the system. currentPrice - the price of that particular stock.

Returns: The created stock object with reference details.

200 – in case of success 400 – if the request is missing the name or invalid price. 208 – if the name given to update is found in system for other stock. 422 – if one of the fields sent is empty or wrong. 403 - if the request is to update/delete the stock within the lock window.

HTTP/1.1 200 OK
Content-Type: application/json

{
    "id": 1,
    "name": "PCNQ2",
    "currentPrice": 23.32,
    "timeCreated": 1636817934,
    "lastUpdated": 1636817934
}

OR

HTTP/1.1 208 Already reported
Content-Type: application/json

OR

HTTP/1.1 400 Bad Request
Content-Type: application/json

{
    "message": "Blank request cannot be updated!"
}

OR

HTTP/1.1 402 Forbidden
Content-Type: application/json

{
    "message": "Cannot manipulate stock within Lock window!"
}

This application is build following TDD principles and are rich with various integration/unit tests based on test pyramids To run all the tests:

mvn clean test

In order to build this application, run the following maven command.

mvn clean package

With Tests:

$ mvn clean install -U

Unit tests:

$ mvn  test

Application Server:

$ java  target/stocks-splurge-1.0.0.jar

    Developed in Jetbrain's IntelliJ IDE

• mocktio failing for API class: https://stackoverflow.com/a/58200905
• json name setting: https://stackoverflow.com/q/40969156
• handlerExceptionResolver not found bean issue : https://stackoverflow.com/a/56121977
• json ignore fields: https://www.baeldung.com/jackson-ignore-null-fields
• integration testing: https://stackoverflow.com/a/35402975
• Mock external API call :
  • https://stackoverflow.com/questions/20504399/testing-springs-requestbody-using-spring-mockmvc
  • using wiremock : https://stackoverflow.com/a/40908543
  • using easymock: https://stackoverflow.com/a/61685017
• assert json content in mvc testing : https://stackoverflow.com/a/41670634
• serving html/static content via rest controller : https://stackoverflow.com/a/47170750
• spring-boot jpa with h2 in-memory:
• https://spring.io/guides/gs/accessing-data-jpa/
• https://www.baeldung.com/spring-boot-h2-database
• jquery UI:
• Modal: https://api.jqueryui.com/dialog/
• closing modal: https://stackoverflow.com/a/58323185
• dynamic string with data from variable:
• $.ajax : https://www.w3schools.com/jquery/ajax_post.asp
  • https://stackoverflow.com/a/2845487
  • error handling: https://stackoverflow.com/q/377644
• events on dynamic buttons: https://stackoverflow.com/a/20030230
• js date from epoch time: https://stackoverflow.com/a/8016205
• dynamically changed accordion content not applying effect issue: https://stackoverflow.com/a/31584133

MIT