Brooklyn Bridge

Kotlin bridge to C++ over jni.

Quick Start

This project runs as a gradle plugin. First of all you need to download the dependencies for the build system. In the root project build.gradle.kts specify the dependency.

buildscript {
    repositories {
        gradlePluginPortal()
        google()
        maven(url = "https://jitpack.io")
    }
    dependencies {
        classpath("com.github.klee0kai.brooklyn:brooklyn-plugin:0.0.3")
    }
}

In the module build.gradle.kts, specify the plugin, configure the parameters if necessary

plugins {
    id("brooklyn-plugin")
}

brooklyn {
    // params
}

The plugin will generate models for a C++ project. Use annotations @JniMirror and @JniPojo. To include cpp generated files, pull them into cmake.

We pull up the Cmake library in accordance with the source code set used. For source set main use ../../../build/generated/sources/main/brooklyn/FindBrooklynBridge.cmake.

get_filename_component(BROOKLYN_FILE
        ../../../build/generated/sources/main/brooklyn/FindBrooklynBridge.cmake
        ABSOLUTE)
if (EXISTS ${BROOKLYN_FILE})
    include(${BROOKLYN_FILE})
endif ()


add_library(${CMAKE_PROJECT_NAME} SHARED  native-lib.cpp
        ${BROOKLYN_SRC}
        )

target_include_directories(${CMAKE_PROJECT_NAME}
        PUBLIC
        ${BROOKLYN_INCLUDE_DIRS}
        )

If you are building an android project, correct the task sequence

afterEvaluate {
    val kotlinCompileTasks = tasks.filterIsInstance<JavaCompile>()
    val cmakeTasks =
        (tasks.filterIsInstance<com.android.build.gradle.tasks.ExternalNativeBuildTask>() +
                tasks.filterIsInstance<com.android.build.gradle.tasks.ExternalNativeBuildJsonTask>()
                )

    cmakeTasks.forEach { cmakeTask ->
        kotlinCompileTasks.forEach { kotlinTask ->
            cmakeTask.mustRunAfter(kotlinTask)
        }
    }
}

Generating files

• Generated folder
  • mappers - index jni methods and classes
  • model - model mirrors and jni class interfaces
  • mirror - cpp class mirrors, which works via jvm
  • brooklyn.h - common import file
  • env.h/env.cpp - multithread support
  • cmake file - import lib cmake file

Name spaces

• brooklyn::mapper - jni class mapper and index
• brooklyn - models

Similar Projects

• HawtJNI - Implementing JNI libraries is a piece of cake when you use HawtJNI

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License

Copyright (c) 2024 Andrey Kuzubov