Archetype

Gradle-based archetype for a Kotlin gRPC "Hello World" project. This will involve setting up a template project structure and configuring Gradle tasks for code generation and building.

1. Set up the Archetype Project

• Create a directory for your archetype: kotlin-grpc-hello-world-archetype.

• Within this directory, create:

  • src/main/resources/archetype-resources (to hold the template project structure)

  • build.gradle.kts (for Gradle configuration)

2. Structure the Template Project

• Inside archetype-resources, create:

  • build.gradle.kts

  • src/main/kotlin/<package> (replace <package> with your desired package name)

  • src/main/proto

3. Populate Template Files

• archetype-resources/build.gradle.kts:

Kotlin

plugins {

    id("org.jetbrains.kotlin.jvm") version "1.8.22" // Or your preferred Kotlin version

    id("com.google.protobuf") version "0.9.4" // Or a compatible version

    application 

}

group = "com.example" // Placeholder, will be replaced by the user

version = "1.0-SNAPSHOT"

repositories {

    mavenCentral()

}

dependencies {

    implementation(platform("io.grpc:grpc-bom:1.57.2")) // Use the latest BOM version

    implementation("io.grpc:grpc-protobuf")

    implementation("io.grpc:grpc-kotlin-stub")

    implementation("io.grpc:grpc-netty-shaded")

    // Kotlin standard library

    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")

    testImplementation("io.grpc:grpc-testing")

    testImplementation("org.jetbrains.kotlin:kotlin-test")

    testImplementation("org.jetbrains.kotlin:kotlin-test-junit")

}

protobuf {

    protoc {

        artifact = "com.google.protobuf:protoc:3.24.4"

    }

    plugins {

        id("grpc") {

            artifact = "io.grpc:protoc-gen-grpc-kotlin:1.5.0:jdk8@jar"

        }

    }

    generateProtoTasks {

        ofSourceSet("main").forEach {

            it.plugins {

                id("grpc")

            }

        }

    }

}

application {

    mainClass.set("<package>.GreeterServerKt") // Adjust to your actual server class

}

tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {

    kotlinOptions {

        jvmTarget = "1.8"

    }

}

sourceSets {

    main {

        java {

            srcDirs("build/generated/source/proto/main/grpc")

            srcDirs("build/generated/source/proto/main/java")

        }

    }

}

• archetype-resources/src/main/proto/helloworld.proto: (standard "Hello World" definition)

• archetype-resources/src/main/kotlin/<package>/:

  • GreeterServer.kt (basic gRPC server implementation)

  • GreeterClient.kt (basic gRPC client implementation)

4. Configure the Archetype's build.gradle.kts

Kotlin

plugins {

    `java-gradle-plugin`

}

group = "com.example" // Adjust as needed

version = "1.0-SNAPSHOT"

Use code with caution.

5. Install the Archetype

• From the root of kotlin-grpc-hello-world-archetype, run:

• Bash

./gradlew install

• • This installs the archetype into your local Gradle repository.

6. Generate a Project

• In a new directory, run:

Bash

gradle init --type kotlin-application

Use code with caution.

• Follow the prompts to select your archetype and provide project details.

Important Considerations:

• Replace placeholders (like <package>) with your actual values.

• Use the latest stable versions of dependencies and plugins.

• Customize the template files further to suit your specific needs.

• Refer to Gradle and gRPC Kotlin documentation for advanced configurations.

This provides a foundational Gradle-based archetype for Kotlin gRPC projects. You can refine and extend it as your projects grow in complexity.