chore: Update build toolchain (#23)

This pull requests updates the project as follows:
1. **Update Gradle version to 4.8**
   This allows us to make use of new features such as native JUnit 5 integration and the build cache.
2. **Update Gradle build configuration according to new changes**
   This change allows us to share configuration across modules and easily change the versions for shared dependencies. In addition, we now make use of the `java-library` plugin which allows for various optimizations. See https://docs.gradle.org/current/userguide/java_library_plugin.html
3. **Add support for Jacoco**
    We add support code coverage tracking via the latest version of Jacoco which has increasing support for Kotlin.

Closes #22 

3 files changed, 26 insertions, 157 deletions

diff --git a/opendc-model-odc/core/build.gradle b/opendc-model-odc/core/build.gradle
index e423da50..091dcbe4 100644
--- a/opendc-model-odc/core/build.gradle
+++ b/opendc-model-odc/core/build.gradle
@@ -23,67 +23,23 @@
  */
 
 /* Build configuration */
-buildscript {
-    ext.kotlin_version = '1.2.21'
-    ext.dokka_version = '0.9.15'
-
-    repositories {
-        mavenCentral()
-        jcenter()
-    }
-
-    dependencies {
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-        classpath "org.jetbrains.dokka:dokka-gradle-plugin:$dokka_version"
-        classpath 'org.junit.platform:junit-platform-gradle-plugin:1.0.3'
-    }
-}
-
-apply plugin: 'java'
-apply plugin: 'kotlin'
-apply plugin: 'org.jetbrains.dokka'
-apply plugin: 'org.junit.platform.gradle.plugin'
-
-compileKotlin {
-    kotlinOptions {
-        jvmTarget = "1.8"
-    }
-}
-
-compileTestKotlin {
-    kotlinOptions {
-        jvmTarget = "1.8"
-    }
-}
-
-kotlin {
-    experimental {
-        coroutines 'enable'
-    }
-}
-
-dokka {
-    outputFormat = 'html'
-    outputDirectory = "$buildDir/javadoc"
-}
+apply from: '../../gradle/kotlin.gradle'
+apply plugin: 'java-library'
 
 /* Project configuration */
-group 'com.atlarge.opendc'
-version '1.1'
-
 repositories {
     jcenter()
 }
 
 dependencies {
-    compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+    implementation "org.jetbrains.kotlin:kotlin-stdlib"
 
-    compile project(':opendc-core')
-    compile project(':opendc-stdlib')
-    compile "io.github.microutils:kotlin-logging:1.4.6"
+    api project(':opendc-core')
+    api project(':opendc-stdlib')
+    implementation "io.github.microutils:kotlin-logging:1.4.6"
 
-    testCompile "org.junit.jupiter:junit-jupiter-api:5.0.0-RC3"
-    testRuntime "org.junit.jupiter:junit-jupiter-engine:5.0.0-RC3"
-    testCompile "org.junit.platform:junit-platform-launcher:1.0.0-RC3"
-    testCompile "org.slf4j:slf4j-simple:1.7.25"
+    testImplementation "org.junit.jupiter:junit-jupiter-api:$junit_jupiter_version"
+    testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:$junit_jupiter_version"
+    testImplementation "org.junit.platform:junit-platform-launcher:$junit_platform_version"
+    testRuntimeOnly "org.slf4j:slf4j-simple:1.7.25"
 }
diff --git a/opendc-model-odc/jpa/build.gradle b/opendc-model-odc/jpa/build.gradle
index 191ca787..33b50d39 100644
--- a/opendc-model-odc/jpa/build.gradle
+++ b/opendc-model-odc/jpa/build.gradle
@@ -23,69 +23,25 @@
  */
 
 /* Build configuration */
-buildscript {
-    ext.kotlin_version = '1.2.21'
-    ext.dokka_version = '0.9.15'
-
-    repositories {
-        mavenCentral()
-        jcenter()
-    }
-
-    dependencies {
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-        classpath "org.jetbrains.kotlin:kotlin-noarg:$kotlin_version"
-        classpath "org.jetbrains.dokka:dokka-gradle-plugin:$dokka_version"
-        classpath 'org.junit.platform:junit-platform-gradle-plugin:1.0.0-RC3'
-    }
-}
-
-apply plugin: 'java'
-apply plugin: 'kotlin'
+apply from: '../../gradle/kotlin.gradle'
+apply plugin: 'java-library'
 apply plugin: 'kotlin-jpa'
-apply plugin: 'org.jetbrains.dokka'
-apply plugin: 'org.junit.platform.gradle.plugin'
-
-compileKotlin {
-    kotlinOptions {
-        jvmTarget = "1.8"
-    }
-}
-
-compileTestKotlin {
-    kotlinOptions {
-        jvmTarget = "1.8"
-    }
-}
-
-kotlin {
-    experimental {
-        coroutines 'enable'
-    }
-}
-
-dokka {
-    outputFormat = 'html'
-    outputDirectory = "$buildDir/javadoc"
-}
 
 /* Project configuration */
-group 'com.atlarge.opendc'
-version '1.1'
-
 repositories {
     jcenter()
 }
 
 dependencies {
-    compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+    implementation "org.jetbrains.kotlin:kotlin-stdlib"
 
-    compile project(':opendc-core')
-    compile project(':opendc-stdlib')
-    compile project(':opendc-model-odc:core')
-    compile 'org.hibernate.javax.persistence:hibernate-jpa-2.1-api:1.0.0.Final'
+    api project(':opendc-core')
+    api project(':opendc-stdlib')
+    api project(':opendc-model-odc:core')
+    api "javax.persistence:javax.persistence-api:2.2"
+    implementation "io.github.microutils:kotlin-logging:1.4.6"
 
-    testCompile 'org.junit.jupiter:junit-jupiter-api:5.0.0-RC3'
-    testRuntime 'org.junit.jupiter:junit-jupiter-engine:5.0.0-RC3'
-    testCompile 'org.junit.platform:junit-platform-launcher:1.0.0-RC3'
+    testImplementation "org.junit.jupiter:junit-jupiter-api:$junit_jupiter_version"
+    testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:$junit_jupiter_version"
+    testImplementation "org.junit.platform:junit-platform-launcher:$junit_platform_version"
 }
diff --git a/opendc-model-odc/setup/build.gradle b/opendc-model-odc/setup/build.gradle
index 1cca2a6e..c3976986 100644
--- a/opendc-model-odc/setup/build.gradle
+++ b/opendc-model-odc/setup/build.gradle
@@ -23,56 +23,12 @@
  */
 
 /* Build configuration */
-buildscript {
-    ext.kotlin_version = '1.2.21'
-    ext.dokka_version = '0.9.15'
-
-    repositories {
-        mavenCentral()
-        jcenter()
-    }
-
-    dependencies {
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-        classpath "org.jetbrains.kotlin:kotlin-noarg:$kotlin_version"
-        classpath "org.jetbrains.dokka:dokka-gradle-plugin:$dokka_version"
-    }
-}
-
-apply plugin: 'java'
+apply from: '../../gradle/kotlin.gradle'
 apply plugin: 'application'
-apply plugin: 'kotlin'
-apply plugin: 'org.jetbrains.dokka'
 
 mainClassName = "com.atlarge.opendc.model.odc.platform.JpaPlatformRunnerKt"
 
-compileKotlin {
-    kotlinOptions {
-        jvmTarget = "1.8"
-    }
-}
-
-compileTestKotlin {
-    kotlinOptions {
-        jvmTarget = "1.8"
-    }
-}
-
-kotlin {
-    experimental {
-        coroutines 'enable'
-    }
-}
-
-dokka {
-    outputFormat = 'html'
-    outputDirectory = "$buildDir/javadoc"
-}
-
 /* Project configuration */
-group 'com.atlarge.opendc'
-version '1.1'
-
 repositories {
     jcenter()
 }
@@ -80,8 +36,9 @@ repositories {
 dependencies {
     compile project(':opendc-model-odc:jpa')
     compile project(':opendc-kernel-omega')
+    compile "io.github.microutils:kotlin-logging:1.4.6"
 
-    runtime 'org.slf4j:slf4j-simple:1.7.25'
-    runtime 'org.hibernate:hibernate-core:5.2.5.Final'
-    runtime 'mysql:mysql-connector-java:5.1.13'
+    runtimeOnly "org.slf4j:slf4j-simple:1.7.25"
+    runtimeOnly "org.hibernate:hibernate-core:5.2.5.Final"
+    runtimeOnly "mysql:mysql-connector-java:5.1.13"
 }