opentelemetry-java-instrumentation/gradle/java.gradle

import java.time.Duration

apply plugin: 'java-library'
apply plugin: 'groovy'

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

def applyCodeCoverage = !(
    project.path.startsWith(":smoke-tests") ||
        //TODO why some tests fail on java 11 if jacoco is present?
        project.path == ":opentelemetry-javaagent" ||
        project.path == ":load-generator" ||
        project.path.startsWith(":benchmark") ||
        project.path.startsWith(":instrumentation"))

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

if (project.hasProperty("minJavaVersionForTests")) {
  project.ext.release = project.getProperty("minJavaVersionForTests")
} else {
  project.ext.release = JavaVersion.VERSION_1_7
}

java {
  sourceCompatibility = JavaVersion.toVersion(project.ext.release)
  targetCompatibility = JavaVersion.toVersion(project.ext.release)
  // See https://docs.gradle.org/current/userguide/upgrading_version_5.html, Automatic target JVM version
  disableAutoTargetJvm()
  withJavadocJar()
  withSourcesJar()
}

sourceSets {
  main {
    java {
      srcDir 'src/main/java'
    }
  }
}

tasks.withType(JavaCompile) {
  options.compilerArgs.addAll(['--release', project.ext.release.majorVersion])
}
tasks.withType(GroovyCompile) {
  options.compilerArgs.addAll(['--release', project.ext.release.majorVersion])
}
tasks.withType(ScalaCompile) {
  options.compilerArgs.addAll(['--release', project.ext.release.majorVersion])
}

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'
}

repositories {
  mavenLocal()
  jcenter()
  mavenCentral()
  maven {
    url "https://repo.typesafe.com/typesafe/releases"
  }
  // this is only needed for the working against unreleased otel-java snapshots
  maven {
    url "https://oss.jfrog.org/artifactory/oss-snapshot-local"
    content {
      includeGroup "io.opentelemetry"
    }
  }
}

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

jar {
  manifest {
    attributes(
        "Implementation-Title": project.name,
        "Implementation-Version": project.version,
        "Implementation-Vendor": "OpenTelemetry",
        "Implementation-URL": "https://github.com/open-telemetry/opentelemetry-java-instrumentation",
    )
  }
}

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

  doFirst {
    if (project.ext.has("apiLinks")) {
      options.links(*project.apiLinks)
    }
  }
  source = sourceSets.main.allJava
  classpath = configurations.compileClasspath

  options {
    encoding = "utf-8"
    docEncoding = "utf-8"
    charSet = "utf-8"

    setMemberLevel JavadocMemberLevel.PUBLIC
    setAuthor true

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

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

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


if (!rootProject.ext.has("javaExecutableVersionCache")) {
  rootProject.ext.javaExecutableVersionCache = [:]
}

/**
 * Returns version of java from a given java home.
 */
JavaVersion getJavaHomeVersion(String javaHome) {
  def cache = rootProject.ext.javaExecutableVersionCache
  if (cache.containsKey(javaHome)) {
    return cache.get(javaHome)
  }
  new ByteArrayOutputStream().withStream { stream ->
    exec {
      commandLine = [toExecutable(javaHome), "-version"]
      errorOutput = stream
    }
    def output = stream.toString()
    for (def line : output.split('\n')) {
      line = line.trim()
      def matcher = line =~ /^(?:java|openjdk) version "([^"]+)"/
      if (matcher) {
        def version = JavaVersion.toVersion(matcher.group(1))
        cache.put(javaHome, version)
        return version
      }
    }

    // Getting here means we didn't find a line matching the version pattern.
    throw new GradleScriptException("Cannot determine java version. Executable: ${javaHome}, output: ${output}", null)
  }
}

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
}

/**
 * For a given java home return the location of java executable
 */
static String toExecutable(String javaHome) {
  return Objects.requireNonNull(javaHome) + "/bin/java"
}

/**
 * Returns java home for a given version or {@code null} if not found
 */
String findJavaHome(JavaVersion version) {
  def javaHome = System.getenv("JAVA_${version.majorVersion}_HOME")
  if (javaHome == null) {
    return null
  }
  def foundVersion = getJavaHomeVersion(javaHome)
  return version == foundVersion ? javaHome : null
}

ext {
  findJavaHome = this.&findJavaHome
  toExecutable = this.&toExecutable
}

def addTestRule(String testTaskName) {
  def prefix = testTaskName + "Java"
  tasks.addRule("Pattern: $prefix<Version>: Runs tests using given java version") { String taskName ->
    if (taskName.startsWith(prefix)) {
      def requestedJavaVersion = JavaVersion.toVersion(taskName - prefix)
      def gradleJavaVersion = JavaVersion.current()

      if (gradleJavaVersion != requestedJavaVersion) {
        def javaHomeForTests = findJavaHome(requestedJavaVersion)
        if (javaHomeForTests != null) {

          tasks.withType(Test).all {
            executable = toExecutable(javaHomeForTests)
            enabled = isJavaVersionAllowed(requestedJavaVersion)
            if (requestedJavaVersion.isJava7()) {
              // 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'
            }
          }
        } else {
          throw new BuildCancelledException("Requested java version $requestedJavaVersion not found")
        }
      }

      task(taskName) {
        if (project.tasks.findByName(testTaskName) != null) {
          dependsOn testTaskName
        }
      }
    }
  }
}

addTestRule("test")
addTestRule("integrationTest")
addTestRule("latestDepTest")

tasks.withType(Test).configureEach {
  if (project.findProperty("enableJunitPlatform") == true) {
    useJUnitPlatform()
  }

  // All tests must complete within 15 minutes.
  // This value is quite big because with lower values (3 mins) we were experiencing large number of false positives
  timeout = Duration.ofMinutes(15)

  // Disable all tests if current JVM doesn't match version requirements
  // Disable all tests if skipTests property was specified
  enabled = isJavaVersionAllowed(JavaVersion.current()) && !project.rootProject.hasProperty("skipTests")
}