ENT-1463, ENT-1903: Refactor Gradle for deterministic modules (#3387)

* Export locations of both deterministic rt.jar and its JDK_HOME as properties.
* Refactor deterministic Java/Kotlin configuration into a script plugin.

core-deterministic/build.gradle

@@ -1,17 +1,14 @@
 description 'Corda core (deterministic)'
 
-apply plugin: 'kotlin'
+apply from: '../deterministic.gradle'
 apply plugin: 'com.jfrog.artifactory'
 apply plugin: 'net.corda.plugins.publish-utils'
 apply plugin: 'idea'
 
-evaluationDependsOn(':jdk8u-deterministic')
 evaluationDependsOn(":core")
 
 def javaHome = System.getProperty('java.home')
 def jarBaseName = "corda-${project.name}".toString()
-def jdkTask = project(':jdk8u-deterministic').assemble
-def deterministic_jdk_home = project(':jdk8u-deterministic').jdk_home
 
 configurations {
     runtimeLibraries
@@ -36,18 +33,6 @@ dependencies {
     runtimeLibraries "org.slf4j:slf4j-api:$slf4j_version"
 }
 
-tasks.withType(AbstractCompile) {
-    dependsOn jdkTask
-}
-
-tasks.withType(JavaCompile) {
-    options.compilerArgs << '-bootclasspath' << "$deterministic_jdk_home/jre/lib/rt.jar".toString()
-}
-
-tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile) {
-    kotlinOptions.jdkHome = deterministic_jdk_home
-}
-
 jar {
     baseName 'DOES-NOT-EXIST'
     // Don't build a jar here because it would be the wrong one.
@@ -162,7 +147,7 @@ task metafix(type: MetaFixerTask) {
 task checkDeterminism(type: ProGuardTask, dependsOn: jdkTask) {
     injars metafix
 
-    libraryjars "$deterministic_jdk_home/jre/lib/rt.jar"
+    libraryjars deterministic_rt_jar
 
     configurations.runtimeLibraries.forEach {
         libraryjars it.path, filter: '!META-INF/versions/**'

core-deterministic/testing/common/build.gradle

@@ -1,29 +1,12 @@
-apply plugin: 'kotlin'
+apply from: '../../../deterministic.gradle'
 apply plugin: 'idea'
 
-evaluationDependsOn(':jdk8u-deterministic')
-
-def jdkTask = project(':jdk8u-deterministic').assemble
-def deterministic_jdk_home = project(':jdk8u-deterministic').jdk_home
-
 dependencies {
     compileOnly project(path: ':core-deterministic', configuration: 'runtimeArtifacts')
     compileOnly project(path: ':serialization-deterministic', configuration: 'runtimeArtifacts')
     compileOnly "junit:junit:$junit_version"
 }
 
-tasks.withType(AbstractCompile) {
-    dependsOn jdkTask
-}
-
-tasks.withType(JavaCompile) {
-    options.compilerArgs << '-bootclasspath' << "$deterministic_jdk_home/jre/lib/rt.jar".toString()
-}
-
-tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile) {
-    kotlinOptions.jdkHome = deterministic_jdk_home
-}
-
 idea {
     module {
         if (project.hasProperty("deterministic_idea_sdk")) {

deterministic.gradle

@@ -0,0 +1,29 @@
+/*
+ * Gradle script plugin: Configure a module such that the Java and Kotlin
+ * compilers use the deterministic rt.jar instead of the full JDK rt.jar.
+ */
+apply plugin: 'kotlin'
+
+evaluationDependsOn(':jdk8u-deterministic')
+
+def jdk8uDeterministic = project(':jdk8u-deterministic')
+
+ext {
+    jdkTask = jdk8uDeterministic.assemble
+    deterministic_jdk_home = jdk8uDeterministic.jdk_home
+    deterministic_rt_jar = jdk8uDeterministic.rt_jar
+}
+
+tasks.withType(AbstractCompile) {
+    dependsOn jdkTask
+
+    // This is a bit ugly, but Gradle isn't recognising the KotlinCompile task
+    // as it does the built-in JavaCompile task.
+    if (it.class.name.startsWith("org.jetbrains.kotlin.gradle.tasks.KotlinCompile")) {
+        kotlinOptions.jdkHome = deterministic_jdk_home
+    }
+}
+
+tasks.withType(JavaCompile) {
+    options.compilerArgs << '-bootclasspath' << deterministic_rt_jar
+}

jdk8u-deterministic/build.gradle

@@ -9,6 +9,7 @@ repositories {
 
 ext {
     jdk_home = "$projectDir/jdk"
+    rt_jar = "$jdk_home/jre/lib/rt.jar".toString()
 }
 
 configurations {

serialization-deterministic/build.gradle

@@ -1,17 +1,14 @@
 description 'Corda serialization (deterministic)'
 
-apply plugin: 'kotlin'
+apply from: '../deterministic.gradle'
 apply plugin: 'com.jfrog.artifactory'
 apply plugin: 'net.corda.plugins.publish-utils'
 apply plugin: 'idea'
 
-evaluationDependsOn(':jdk8u-deterministic')
 evaluationDependsOn(":serialization")
 
 def javaHome = System.getProperty('java.home')
 def jarBaseName = "corda-${project.name}".toString()
-def jdkTask = project(':jdk8u-deterministic').assemble
-def deterministic_jdk_home = project(':jdk8u-deterministic').jdk_home
 
 configurations {
     runtimeLibraries
@@ -30,18 +27,6 @@ dependencies {
     runtimeLibraries "org.iq80.snappy:snappy:$snappy_version"
 }
 
-tasks.withType(AbstractCompile) {
-    dependsOn jdkTask
-}
-
-tasks.withType(JavaCompile) {
-    options.compilerArgs << "-bootclasspath" << "$deterministic_jdk_home/jre/lib/rt.jar".toString()
-}
-
-tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile) {
-    kotlinOptions.jdkHome = deterministic_jdk_home
-}
-
 jar {
     baseName 'DOES-NOT-EXIST'
     // Don't build a jar here because it would be the wrong one.
@@ -150,7 +135,7 @@ task metafix(type: MetaFixerTask) {
 task checkDeterminism(type: ProGuardTask, dependsOn: jdkTask) {
     injars metafix
 
-    libraryjars "$deterministic_jdk_home/jre/lib/rt.jar"
+    libraryjars deterministic_rt_jar
 
     configurations.runtimeLibraries.forEach {
         libraryjars it.path, filter: '!META-INF/versions/**'