How to use ZLayers in a ZIO 2.0 Application

This is the Scala project for the Hivemind Technologies blog article about ZIO Layers (ZLayers). You can find the article in this link.

Architecture of the Application

The application is structured in 4 different layers:

• Application
• Service
• Repository
• Database

%%{init: {"flowchart": {"htmlLabels": false}} }%%
flowchart TB
    subgraph appLayer["Application Layer"]
        direction LR
        app["Application"]
        appConfig["App Config"]
        appLogger["App Logger"]
    end

    subgraph serviceLayer["Service Layer"]
        propService["Property Service"]
        userService["User Service"]
    end

    subgraph repoLayer["Repository Layer"]
        userRepo["User Repository"]
        propRepo["Property Repository"]
    end

    subgraph dbLayer["Database Layer"]
        database["Database"]
        db[(Database)]
        dbConfig["Database Config"]
        dbLogger["DB Logger"]
    end

    app -. " findUser() " .-> userService -. " getUserById() " .-> userRepo -. " getObjectById() " .-> database -. " SQL query " .-> db
    app -. " findProperty() " .-> propService -. " getPropertyById() " .-> propRepo -. " getObjectById() " .-> database
    app -. " findPropertiesOfUser() " .-> propService -. " getPropertiesByOwnerId() " .-> propRepo -. " getAllRecords() " .-> database
    database -. " uses " .-> dbLogger
    database -. " uses " .-> dbConfig

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Provided SBT commands

Clean project files

This will clean the compilation files (*.class) from the project:

sbt clean

Formatting all project files

The following command with format all the Scala files (*.scala) according to the scala format file provided in the project (.scalafmt.conf)

sbt fmt

Compiling the project files

The following command will compile the main project files:

sbt compile

Running the tests

This will execute all the tests in the project:

sbt test

Clean, format, compile, and run the tests in the same command

The sbt check command will execute the following steps:

1. Clean all compilation files (*.class)
2. Format all project files
3. Compile all project files (including test classes)
4. Execute all the tests

sbt check