Backend for QuestPets

Running

1. Ensure your java version is set to 11 (or higher. Tested on Java 11.0.12)
2. Navigate to src/main/resources/application.properties and add the key-values for the database connection as follows (If it doesn’t exist, create it):

spring.data.mongodb.uri=mongodb+srv://QuestPets:8UwDqweavCFwA9FF@questpets.dbvntgm.mongodb.net/test
spring.data.mongodb.database=EntitiesDB
server.error.whitelabel.enabled=true

1. Navigate to the src/main/java/com/backend folder from a terminal
2. Ensure the port 8080 is free and open for the backend to use
3. Run the command command_place_holder on MacOS or command_place_holder on Windows
   • You could use your IDE as well to run the QuestPetsApplication.java
4. The API is accessible at [http://localhost:8080/](http://localhost:8080/) The root route is a test route to ensure the service is active (HelloWorld)

Testing

• Navigate to the src/test/java file and run the desired class to be tested using your IDE.
• This will setup a Spring environment and establish the database connections required for the rest of the test files to work properly.

Contributing

• Open the backend directory in your IDE (not the project root folder) as otherwise your IDE may have trouble downloading the Gradle dependencies
• Follow the pre-existing naming convention (camelCase)

Debugging

• An error during the run command is usually either due to the wrong java version or blocked port
• Debugging information can be traced through logged messaged and following error stackTrace (LogHandler Deprecation disable)
• The “Whitelabel error” / “Error handling this Response” means you are missing imports specific to Spring or have misconfigured routes in your application

How It’s Designed

There are 4 packages to note here:

1. com.backend.controllers
2. com.backend.entities
3. com.backend.repositories
4. com.backend.usecases

Also to note the directory error that provides a statically accessible logger method for the Backend through a custom built logger.

Flow of Data

flowchart TD
  client(Client) <--> controller(Controller)
	controller <--> manager(Use Case)
	manager <--> model(Entity)
	repository <--> model
	model --> repository(Repository)
	exceptionHandler(LogHandler)
	controller <--> exceptionHandler
	manager --> exceptionHandler

Entities

• Data Transfer Objects
• Perform Validation
• Perform Generation

Controllers

• Interactor for the API
• Handles API calls from frontend (or client)
• Contracts appropriate manager to complete request

Repositories

• Handles database connection
• Custom queries
• Saving and deleting data

Use Cases

• Handles use case requests
• Package raw data to entities
• Contact repositories when needed
• Check for error handling (with LogHandler)