opentelemetry-java-instrumentation/gradle/java.gradle

import java.time.Duration

apply plugin: 'java'
apply plugin: 'groovy'

apply from: "$rootDir/gradle/checkstyle.gradle"
apply from: "$rootDir/gradle/codenarc.gradle"

def applyCodeCoverage = !(project.plugins.hasPlugin('com.github.johnrengelman.shadow')
  || project.path.startsWith(":dd-java-agent:instrumentation:"))

if (applyCodeCoverage) {
  apply from: "$rootDir/gradle/jacoco.gradle"
}

sourceCompatibility = 1.7
targetCompatibility = 1.7

java {
  // See https://docs.gradle.org/current/userguide/upgrading_version_5.html, Automatic target JVM version
  disableAutoTargetJvm()
}

[JavaCompile, ScalaCompile].each { type ->
  tasks.withType(type) {
    doFirst {
      // We do this specifically for Java7 bytecode generation because we would like to be able to compile
      // with Java8+ compiler. This likely would require some modifications when we switch to java11 compiler.
      // Using proper Java7 bootstrap and extensions allows to be sure our code will run on real Java7.
      if (JavaVersion.toVersion(sourceCompatibility) == JavaVersion.VERSION_1_7
        && JavaVersion.current() != JavaVersion.VERSION_1_7
        && System.env.JAVA_7_HOME != null) {
        options.fork = true
        options.bootstrapClasspath = fileTree(include: ['*.jar'], dir: "${System.env.JAVA_7_HOME}/jre/lib/")
        options.extensionDirs = "${System.env.JAVA_7_HOME}/jre/lib/ext/"
      }
    }
  }
}

apply plugin: "io.franzbecker.gradle-lombok"

lombok { // optional: values below are the defaults
  version = versions.lombok
  sha256 = ""
}

apply plugin: "eclipse"
eclipse {
  classpath {
    downloadSources = true
    downloadJavadoc = true
  }
}
if (configurations.find { it.name == 'jmh' }) {
  eclipse.classpath.plusConfigurations += [configurations.jmh]
}

jar {
  /*
  Make Jar build fail on duplicate files

  By default Gradle Jar task can put multiple files with the same name
  into a Jar. This may lead to confusion. For example if auto-service
  annotation processing creates files with same name in `scala` and
  `java` directory this would result in Jar having two files with the
  same name in it. Which in turn would result in only one of those
  files being actually considered when that Jar is used leading to very
  confusing failures.

  Instead we should 'fail early' and avoid building such Jars.
  */
  duplicatesStrategy = 'fail'
}

tasks.register("packageSources", Jar) {
  classifier = 'sources'
  from sourceSets.main.allSource
}
artifacts.archives packageSources

repositories {
  mavenLocal()
  jcenter()
  mavenCentral()
}

dependencies {
  testCompile deps.spock
  testCompile deps.groovy
  testCompile deps.testLogging
  testCompile group: 'info.solidsoft.spock', name: 'spock-global-unroll', version: '0.5.1'
  testCompile group: 'com.anotherchrisberry', name: 'spock-retry', version: '0.6.4'
  testCompile group: 'com.github.stefanbirkner', name: 'system-rules', version: '1.19.0'
}

jar {
  manifest {
    attributes(
      "Implementation-Title": project.name,
      "Implementation-Version": project.version,
      "Implementation-Vendor": "Datadog",
      "Implementation-URL": "https://github.com/datadog/dd-trace-java",
    )
  }
}

tasks.withType(Javadoc).configureEach {
  options.encoding = "utf-8"
  options.docEncoding = "utf-8"
  options.charSet = "utf-8"

  options.addStringOption('Xdoclint:none', '-quiet')

  doFirst {
    if (project.ext.has("apiLinks")) {
      options.links(*project.apiLinks)
    }
  }
}

javadoc {
  source = sourceSets.main.allJava
  classpath = configurations.compileClasspath

  options {
    setMemberLevel JavadocMemberLevel.PUBLIC
    setAuthor true

    links "https://docs.oracle.com/javase/8/docs/api/"
  }
}

tasks.register("sourceJar", Jar) {
  from sourceSets.main.allJava
  classifier = 'sources'
}

tasks.register("javaDocJar", Jar) {
  from javadoc.destinationDir
  classifier = 'javadoc'
  dependsOn javadoc
}

artifacts {
  archives sourceJar
  archives javaDocJar
}

project.afterEvaluate {
  if (project.plugins.hasPlugin('org.unbroken-dome.test-sets') && configurations.hasProperty("latestDepTestRuntime")) {
    tasks.withType(Test).configureEach {
      doFirst {
        def testArtifacts = configurations.testRuntime.resolvedConfiguration.resolvedArtifacts
        def latestTestArtifacts = configurations.latestDepTestRuntime.resolvedConfiguration.resolvedArtifacts
        assert testArtifacts != latestTestArtifacts: "latestDepTest dependencies are identical to test"
      }
    }
  }
}

if (project.plugins.hasPlugin('com.github.johnrengelman.shadow')) {
  // Remove the no-deps jar from the archives to prevent publication
  configurations.archives.with {
    artifacts.remove artifacts.find {
      if (it.hasProperty("delegate")) {
        it.delegate.archiveTask.is jar
      } else {
        it.archiveTask.is jar
      }
    }
  }
  artifacts {
    archives shadowJar
  }
}

if (project.hasProperty("removeJarVersionNumbers") && removeJarVersionNumbers) {
  tasks.withType(AbstractArchiveTask).configureEach {
    version = null
  }
}

if (project.parent && project.parent.hasProperty("javaExecutableVersionCache")) {
  project.ext.javaExecutableVersionCache = project.parent.ext.javaExecutableVersionCache
} else {
  project.ext.javaExecutableVersionCache = [:]
}

JavaVersion getJavaExecutableVersion(String path) {
  def cache = project.ext.javaExecutableVersionCache

  if (cache.containsKey(path)) {
    return cache.get(path)
  }
  new ByteArrayOutputStream().withStream { stream ->
    exec {
      commandLine = [path, "-version"]
      errorOutput = stream
    }
    def matcher = stream.toString() =~ /^(?:java|openjdk) version "([^"]+)"/
    if (matcher) {
      def version = JavaVersion.toVersion(matcher.group(1))
      cache.put(path, version)
      return version
    } else {
      throw new GradleScriptException("Cannot determine java version: ${stream.toString}")
    }
  }
}

def isJavaVersionAllowed(JavaVersion version) {
  if (project.hasProperty('minJavaVersionForTests') && project.getProperty('minJavaVersionForTests').compareTo(version) > 0) {
    return false
  }
  if (project.hasProperty('maxJavaVersionForTests') && project.getProperty('maxJavaVersionForTests').compareTo(version) < 0) {
    return false
  }
  return true
}

// JVM names we would like to run complete test suite on
// Note: complete test suite is always run on JVM used for compilation
// Note2: apparently there is no way to have a 'global' variable, so instead we have per project
// attribute that has same value in all projects
project.ext.majorSupportedJVMs = ["7", "11"]

def isTestingEnabled(String javaName) {
  if (javaName in project.majorSupportedJVMs) {
    return true
  }
  if (project.findProperty("coreJavaInstrumentation") || project.findProperty("integrationTests")) {
    return true
  }
  return false
}

// Disable default test tasks if current JVM doesn't match version requirements
tasks.withType(Test).configureEach {
  if (name.endsWith("Generated")) {
    return
  }

  // Always run all tests that are runnable on JVM used for compilation
  onlyIf { isJavaVersionAllowed(JavaVersion.current()) }
}

// Generate tests tasks for all provided JVMs
for (def env : System.getenv().entrySet()) {
  def matcher = env.key =~ /JAVA_([^_]+)_HOME/
  if (!matcher) {
    continue
  }
  def javaName = matcher.group(1)
  def javaHome = env.value
  def javaPath = "$javaHome/bin/java"
  def javaVersion = getJavaExecutableVersion(javaPath)

  // This is slightly complicated because we need to dereference symlinks to make sure
  // we are considering same JVM implementation
  def currentJavaHome = new File(System.getProperty("java.home")).toPath().toRealPath()
  if (currentJavaHome.endsWith("jre")) {
    currentJavaHome = currentJavaHome.parent
  }
  if (currentJavaHome == new File(javaHome).toPath().toRealPath()) {
    // Skip JVM implementation we are running gradle on
    continue
  }

  def parentTask = task "testJava${javaName}"() {
    group = 'Verification'
    description = "Run tests for Java ${javaName}"
  }
  tasks.check.dependsOn parentTask

  tasks.withType(Test).all {
    //if (name.endsWith("Generated")) {
    if (!name.equals("test")) {
      // The way we're copying the test doesn't currently work with "test-sets" generated tests.
      return
    }

    def clonedTask = it
    def newTask = task "${clonedTask.name}Java${javaName}Generated"(type: clonedTask.class) {
      description "Runs $clonedTask.name under java ${javaName}"
      executable = javaPath

      if (javaName == "7") {
        // Disable JIT for this method. Sometimes Java7 JVM crashes trying to compile it.
        jvmArgs '-XX:CompileCommand=exclude,net.bytebuddy.description.type.TypeDescription$Generic$Visitor$Substitutor::onParameterizedType'
      }

      onlyIf { isJavaVersionAllowed(javaVersion) && isTestingEnabled(javaName) }
      if (applyCodeCoverage) {
        jacoco {
          // Disable jacoco for additional JVM tests to speed things up a bit
          enabled = false
        }
      }
    }

    parentTask.dependsOn newTask
  }
}

tasks.withType(Test).configureEach {
  // All tests must complete within 2 minutes.
  timeout = Duration.ofMinutes(2)
  
  // Disable all tests if skipTests property was specified
  onlyIf { !project.rootProject.hasProperty("skipTests") }
}

plugins.withType(BasePlugin) {
  project.afterEvaluate {
    def deleteTasks = tasks.withType(Delete) + project.tasks.findByPath('clean')
    def otherTasks = tasks - deleteTasks
    otherTasks*.mustRunAfter deleteTasks
  }
}