lucene/gradle/testing/alternative-jdk-support.gradle

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import org.gradle.internal.jvm.JavaInfo
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import org.gradle.internal.jvm.Jvm
import org.gradle.internal.jvm.inspection.JvmInstallationMetadata
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import org.gradle.internal.jvm.inspection.JvmMetadataDetector
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// This adds support for compiling and testing against a different Java runtime.
//
// I failed to set it up leveraging Gradle's toolchains because
// a toolchain spec is not flexible enough to provide an exact location of the JVM to be used;
// if you have two identical JVM lang. versions in auto-discovered JVMs, an arbitrary one is used (?).
// This situation is not uncommon when debugging low-level stuff (hand-compiled JVM binaries).
//
// The code below is a workaround using internal gradle classes. It may stop working in the future
// but for now it's fine.
JavaInfo jvmGradle = Jvm.current();
JavaInfo jvmCurrent = {
def runtimeJavaHome = propertyOrDefault("runtime.java.home", System.getenv('RUNTIME_JAVA_HOME'))
if (runtimeJavaHome != null) {
return Jvm.forHome(file(runtimeJavaHome))
} else {
return jvmGradle
}
}()
JvmMetadataDetector jvmDetector = project.services.get(JvmMetadataDetector)
if (jvmGradle != jvmCurrent) {
configure(rootProject) {
task altJvmWarning() {
doFirst {
def jvmInfo = { JavaInfo javaInfo ->
JvmInstallationMetadata jvmMetadata = jvmDetector.getMetadata(javaInfo.javaHome)
return "${jvmMetadata.languageVersion} (${jvmMetadata.displayName} ${jvmMetadata.runtimeVersion}, home at: ${jvmMetadata.javaHome})"
}
logger.warn("""NOTE: Alternative java toolchain will be used for compilation and tests:
Project will use ${jvmInfo(jvmCurrent)}
Gradle runs with ${jvmInfo(jvmGradle)}
""")
}
}
}
allprojects {
// Any tests
tasks.withType(Test) {
dependsOn ":altJvmWarning"
executable = jvmCurrent.javaExecutable
}
// Any javac compilation tasks
tasks.withType(JavaCompile) {
dependsOn ":altJvmWarning"
options.fork = true
options.forkOptions.javaHome = jvmCurrent.javaHome
}
// Javadoc compilation.
def javadocExecutable = jvmCurrent.javadocExecutable
tasks.matching { it.name == "renderJavadoc" || it.name == "renderSiteJavadoc" }.all {
dependsOn ":altJvmWarning"
executable = javadocExecutable.toString()
}
}
}
// Set up root project's properties.
rootProject.ext.runtimeJavaExecutable = jvmCurrent.javaExecutable
rootProject.ext.runtimeJavaHome = jvmCurrent.javaHome
rootProject.ext.runtimeJavaVersion = jvmDetector.getMetadata(jvmCurrent.javaHome).languageVersion
rootProject.ext.usesAltJvm = (jvmGradle != jvmCurrent);