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Diffstat (limited to 'Scala/example/project/ProgFunBuild.scala')
| -rw-r--r-- | Scala/example/project/ProgFunBuild.scala | 646 |
1 files changed, 646 insertions, 0 deletions
diff --git a/Scala/example/project/ProgFunBuild.scala b/Scala/example/project/ProgFunBuild.scala new file mode 100644 index 0000000..93d4b9d --- /dev/null +++ b/Scala/example/project/ProgFunBuild.scala @@ -0,0 +1,646 @@ +import sbt._ +import Keys._ + +import scalaz.Scalaz.mkIdentity +import scalaz.{Success, Failure} +import com.typesafe.sbteclipse.plugin.EclipsePlugin.EclipseKeys + +/** + * See README.md for high-level overview + * + * Libraries Doc Links + * + * Coursera API + * - http://support.coursera.org/customer/portal/articles/573466-programming-assignments + * - the python script 'submit.py' that can be downloaded from the above site + * + * SBT + * - https://github.com/harrah/xsbt/wiki/Getting-Started-Full-Def + * - https://github.com/harrah/xsbt/wiki/Getting-Started-Custom-Settings + * - https://github.com/harrah/xsbt/wiki/Getting-Started-More-About-Settings + * - https://github.com/harrah/xsbt/wiki/Input-Tasks + * - https://github.com/harrah/xsbt/wiki/Tasks + * - http://harrah.github.com/xsbt/latest/api/index.html + * - https://groups.google.com/forum/?fromgroups#!forum/simple-build-tool + * + * Dispatch + * - http://dispatch-classic.databinder.net/Response+Bodies.html + * - http://www.flotsam.nl/dispatch-periodic-table.html + * - http://databinder.net/dispatch-doc/ + * + * Scalaz + * - http://www.lunatech-research.com/archives/2012/03/02/validation-scala + * - http://scalaz.github.com/scalaz/scalaz-2.9.1-6.0.4/doc/index.html#scalaz.Validation + * + * Apache Commons Codec 1.4 + * - http://www.jarvana.com/jarvana/view/commons-codec/commons-codec/1.4/commons-codec-1.4-javadoc.jar!/index.html + * + * Scalatest + * - http://doc.scalatest.org/1.9.1/index.html#org.scalatest.package + */ +object ProgFunBuild extends Build { + + /*********************************************************** + * MAIN PROJECT DEFINITION + */ + + lazy val assignmentProject = Project(id = "assignment", base = file(".")) settings( + // 'submit' depends on 'packageSrc', so needs to be a project-level setting: on build-level, 'packageSrc' is not defined + submitSetting, + createHandoutSetting, + // put all libs in the lib_managed directory, that way we can distribute eclipse project files + retrieveManaged := true, + EclipseKeys.relativizeLibs := true, + // Avoid generating eclipse source entries for the java directories + (unmanagedSourceDirectories in Compile) <<= (scalaSource in Compile)(Seq(_)), + (unmanagedSourceDirectories in Test) <<= (scalaSource in Test)(Seq(_)), + commonSourcePackages := Seq(), // see build.sbt + gradingTestPackages := Seq(), // see build.sbt + selectMainSources, + selectTestSources, + scalaTestSetting, + styleCheckSetting, + setTestPropertiesSetting, + setTestPropertiesHook + ) settings (packageSubmissionFiles: _*) + + + /*********************************************************** + * SETTINGS AND TASKS + */ + + /** The 'submit' task uses this project name (defined in the build.sbt file) to know where to submit the solution */ + val submitProjectName = SettingKey[String]("submitProjectName") + + /** Project-specific settings, see main build.sbt */ + val projectDetailsMap = SettingKey[Map[String, ProjectDetails]]("projectDetailsMap") + + /** + * The files that are handed out to students. Accepts a string denoting the project name for + * which a handout will be generated. + */ + val handoutFiles = TaskKey[String => PathFinder]("handoutFiles") + + /** + * This setting allows to restrict the source files that are compiled and tested + * to one specific project. It should be either the empty string, in which case all + * projects are included, or one of the project names from the projectDetailsMap. + */ + val currentProject = SettingKey[String]("currentProject") + + /** Package names of source packages common for all projects, see comment in build.sbt */ + val commonSourcePackages = SettingKey[Seq[String]]("commonSourcePackages") + + /** Package names of test sources for grading, see comment in build.sbt */ + val gradingTestPackages = SettingKey[Seq[String]]("gradingTestPackages") + + /************************************************************ + * SUBMITTING A SOLUTION TO COURSERA + */ + + val packageSubmission = TaskKey[File]("packageSubmission") + + val packageSubmissionFiles = { + // the packageSrc task uses Defaults.packageSrcMappings, which is defined as concatMappings(resourceMappings, sourceMappings) + // in the packageSubmisson task we only use the sources, not the resources. + inConfig(Compile)(Defaults.packageTaskSettings(packageSubmission, Defaults.sourceMappings)) + } + + /** Task to submit a solution to coursera */ + val submit = InputKey[Unit]("submit") + + lazy val submitSetting = submit <<= inputTask { argTask => + (argTask, compile in Compile, currentProject, (packageSubmission in Compile), submitProjectName, projectDetailsMap, streams) map { (args, _, currentProject, sourcesJar, projectName, detailsMap, s) => + if (currentProject != "") { + val msg = + """The 'currentProject' setting is not empty: '%s' + | + |This error only appears if there are mistakes in the build scripts. Please re-download the assignment + |from the coursera webiste. Make sure that you did not perform any changes to the build files in the + |`project/` directory. If this error persits, ask for help on the course forums.""".format(currentProject).stripMargin +"\n " + s.log.error(msg) + failSubmit() + } else { + lazy val wrongNameMsg = + """Unknown project name: %s + | + |This error only appears if there are mistakes in the build scripts. Please re-download the assignment + |from the coursera webiste. Make sure that you did not perform any changes to the build files in the + |`project/` directory. If this error persits, ask for help on the course forums.""".format(projectName).stripMargin +"\n " + // log strips empty lines at the ond of `msg`. to have one we add "\n " + val details = detailsMap.getOrElse(projectName, {s.log.error(wrongNameMsg); failSubmit()}) + args match { + case email :: otPassword :: Nil => + submitSources(sourcesJar, details, email, otPassword, s.log) + case _ => + val msg = + """No e-mail address and / or submission password provided. The required syntax for `submit` is + | submit <e-mail> <submissionPassword> + | + |The submission password, which is NOT YOUR LOGIN PASSWORD, can be obtained from the assignment page + | https://class.coursera.org/%s/assignment/index""".format(details.courseId).stripMargin +"\n " + s.log.error(msg) + failSubmit() + } + } + } + } + + + def submitSources(sourcesJar: File, submitProject: ProjectDetails, email: String, otPassword: String, logger: Logger) { + import CourseraHttp._ + logger.info("Connecting to coursera. Obtaining challenge...") + val res = for { + challenge <- getChallenge(email, submitProject) + chResponse <- { + logger.info("Computing challenge response...") + challengeResponse(challenge, otPassword).successNel[String] + } + response <- { + logger.info("Submitting solution...") + submitSolution(sourcesJar, submitProject, challenge, chResponse) + } + } yield response + + res match { + case Failure(msgs) => + for (msg <- msgs.list) logger.error(msg) + failSubmit() + case Success(response) => + logger.success("Your code was successfully submitted: "+ response) + } + } + + + def failSubmit(): Nothing = { + sys.error("Submission failed") + } + + + + /*********************************************************** + * CREATE THE HANDOUT ZIP FILE + */ + + val createHandout = InputKey[File]("createHandout") + + // depends on "compile in Test" to make sure everything compiles. also makes sure that + // all dependencies are downloaded, because we pack the .jar files into the handout. + lazy val createHandoutSetting = createHandout <<= inputTask { argTask => + (argTask, currentProject, baseDirectory, handoutFiles, submitProjectName, target, projectDetailsMap, compile in Test) map { (args, currentProject, basedir, filesFinder, submitProject, targetDir, detailsMap, _) => + if (currentProject != "") + sys.error("\nthe 'currentProject' setting in build.sbt needs to be \"\" in order to create a handout") + else args match { + case handoutProjectName :: eclipseDone :: Nil if eclipseDone == "eclipseWasCalled" => + if (handoutProjectName != submitProject) + sys.error("\nThe `submitProjectName` setting in `build.sbt` must match the project name for which a handout is generated\n ") + val files = filesFinder(handoutProjectName).get + val filesWithRelativeNames = files.x_!(relativeTo(basedir)) map { + case (file, name) => (file, handoutProjectName+"/"+name) + } + val targetZip = targetDir / (handoutProjectName +".zip") + IO.zip(filesWithRelativeNames, targetZip) + targetZip + case _ => + val msg =""" + | + |Failed to create handout. Syntax: `createHandout <projectName> <eclipseWasCalled>` + | + |Valid project names are: %s + | + |The argument <eclipseWasCalled> needs to be the string "eclipseWasCalled". This is to remind + |you that you **need** to manually run the `eclipse` command before running `createHandout`. + | """.stripMargin.format(detailsMap.keys.mkString(", ")) + sys.error(msg) + } + } + } + + + /************************************************************ + * LIMITING SOURCES TO CURRENT PROJECT + */ + + def filter(basedir: File, packages: Seq[String]) = new FileFilter { + def accept(file: File) = { + basedir.equals(file) || { + IO.relativize(basedir, file) match { + case Some(str) => + packages exists { pkg => + str.startsWith(pkg) + } + case _ => + sys.error("unexpected test file: "+ file +"\nbase dir: "+ basedir) + } + } + } + } + + def projectFiles(allFiles: Seq[File], basedir: File, projectName: String, globalPackages: Seq[String], detailsMap: Map[String, ProjectDetails]) = { + if (projectName == "") allFiles + else detailsMap.get(projectName) match { + case Some(project) => + val finder = allFiles ** filter(basedir, globalPackages :+ project.packageName) + finder.get + case None => + sys.error("currentProject is set to an invalid name: "+ projectName) + } + } + + /** + * Only include source files of 'currentProject', helpful when preparign a specific assignment. + * Also keeps the source packages in 'commonSourcePackages'. + */ + val selectMainSources = { + (unmanagedSources in Compile) <<= (unmanagedSources in Compile, scalaSource in Compile, projectDetailsMap, currentProject, commonSourcePackages) map { (sources, srcMainScalaDir, detailsMap, projectName, commonSrcs) => + projectFiles(sources, srcMainScalaDir, projectName, commonSrcs, detailsMap) + } + } + + /** + * Only include the test files which are defined in the package of the current project. + * Also keeps test sources in packages listed in 'gradingTestPackages'. + */ + val selectTestSources = { + (unmanagedSources in Test) <<= (unmanagedSources in Test, scalaSource in Test, projectDetailsMap, currentProject, gradingTestPackages) map { (sources, srcTestScalaDir, detailsMap, projectName, gradingSrcs) => + projectFiles(sources, srcTestScalaDir, projectName, gradingSrcs, detailsMap) + } + } + + + /************************************************************ + * PARAMETERS FOR RUNNING THE TESTS + * + * Setting some system properties that are parameters for the GradingSuite test + * suite mixin. This is for running the `test` task in SBT's JVM. When running + * the `scalaTest` task, the ScalaTestRunner creates a new JVM and passes the + * same properties. + */ + + val setTestProperties = TaskKey[Unit]("setTestProperties") + val setTestPropertiesSetting = setTestProperties := { + import scala.util.Properties._ + import Settings._ + setProp(scalaTestIndividualTestTimeoutProperty, individualTestTimeout.toString) + setProp(scalaTestDefaultWeigthProperty, scalaTestDefaultWeigth.toString) + } + + val setTestPropertiesHook = (test in Test) <<= (test in Test).dependsOn(setTestProperties) + + + /************************************************************ + * RUNNING WEIGHTED SCALATEST & STYLE CHECKER ON DEVELOPMENT SOURCES + */ + + def copiedResourceFiles(copied: collection.Seq[(java.io.File, java.io.File)]): List[File] = { + copied collect { + case (from, to) if to.isFile => to + } toList + } + + val scalaTest = TaskKey[Unit]("scalaTest") + val scalaTestSetting = scalaTest <<= + (compile in Compile, + compile in Test, + fullClasspath in Test, + copyResources in Compile, + classDirectory in Test, + baseDirectory, + streams) map { (_, _, classpath, resources, testClasses, basedir, s) => + // we use `map`, so this is only executed if all dependencies succeed. no need to check `GradingFeedback.isFailed` + val logger = s.log + val outfile = basedir / Settings.testResultsFileName + val policyFile = basedir / Settings.policyFileName + val (score, maxScore, feedback, runLog) = ScalaTestRunner.runScalaTest(classpath, testClasses, outfile, policyFile, copiedResourceFiles(resources), logger.error(_)) + logger.info(feedback) + logger.info("Test Score: "+ score +" out of "+ maxScore) + if (!runLog.isEmpty) { + logger.info("Console output of ScalaTest process") + logger.info(runLog) + } + } + + val styleCheck = TaskKey[Unit]("styleCheck") + + /** + * depend on compile to make sure the sources pass the compiler + */ + val styleCheckSetting = styleCheck <<= (compile in Compile, sources in Compile, streams) map { (_, sourceFiles, s) => + val logger = s.log + val (feedback, score) = StyleChecker.assess(sourceFiles) + logger.info(feedback) + logger.info("Style Score: "+ score +" out of "+ StyleChecker.maxResult) + } + + + /************************************************************ + * PROJECT DEFINITION FOR GRADING + */ + + lazy val submissionProject = Project(id = "submission", base = file(Settings.submissionDirName)) settings( + /** settings we take over from the assignment project */ + version <<= (version in assignmentProject), + name <<= (name in assignmentProject), + scalaVersion <<= (scalaVersion in assignmentProject), + scalacOptions <<= (scalacOptions in assignmentProject), + libraryDependencies <<= (libraryDependencies in assignmentProject), + + /** settings specific to the grading project */ + initGradingSetting, + // default value, don't change. see comment on `val partIdOfGradingProject` + partIdOfGradingProject := "", + gradeProjectDetailsSetting, + setMaxScoreSetting, + setMaxScoreHook, + // default value, don't change. see comment on `val apiKey` + apiKey := "", + getSubmissionSetting, + getSubmissionHook, + submissionLoggerSetting, + readCompileLog, + readTestCompileLog, + setTestPropertiesSetting, + setTestPropertiesHook, + resourcesFromAssignment, + selectResourcesForProject, + testSourcesFromAssignment, + selectTestsForProject, + scalaTestSubmissionSetting, + styleCheckSubmissionSetting, + gradeSetting, + EclipseKeys.skipProject := true + ) + + /** + * The assignment part id of the project to be graded. Don't hard code this setting in .sbt or .scala, this + * setting should remain a (command-line) parameter of the `submission/grade` task, defined when invoking sbt. + * See also feedback string in "val gradeProjectDetailsSetting". + */ + val partIdOfGradingProject = SettingKey[String]("partIdOfGradingProject") + + /** + * The api key to access non-public api parts on coursera. This key is secret! It's defined in + * 'submission/settings.sbt', which is not part of the handout. + * + * Default value 'apiKey' to make the handout sbt project work + * - In the handout, apiKey needs to be defined, otherwise the build doesn't compile + * - When correcting, we define 'apiKey' in the 'submission/sectrets.sbt' file + * - The value in the .sbt file will take precedence when correcting (settings in .sbt take + * precedence over those in .scala) + */ + val apiKey = SettingKey[String]("apiKey") + + + /************************************************************ + * GRADING INITIALIZATION + */ + + val initGrading = TaskKey[Unit]("initGrading") + lazy val initGradingSetting = initGrading <<= (clean, sourceDirectory, baseDirectory) map { (_, submissionSrcDir, basedir) => + deleteFiles(submissionSrcDir, basedir) + GradingFeedback.initialize() + RecordingLogger.clear() + } + + def deleteFiles(submissionSrcDir: File, basedir: File) { + // don't delete anything in offline mode, useful for us when hacking testing / stylechecking + if (!Settings.offlineMode){ + IO.delete(submissionSrcDir) + IO.delete(basedir / Settings.submissionJarFileName) + IO.delete(basedir / Settings.testResultsFileName) + } + } + + /** ProjectDetails of the project that we are grading */ + val gradeProjectDetails = TaskKey[ProjectDetails]("gradeProjectDetails") + + // here we depend on `initialize` because we already use the GradingFeedback + lazy val gradeProjectDetailsSetting = gradeProjectDetails <<= (initGrading, partIdOfGradingProject, projectDetailsMap in assignmentProject) map { (_, partId, detailsMap) => + detailsMap.find(_._2.assignmentPartId == partId) match { + case Some((_, details)) => + details + case None => + val validIds = detailsMap.map(_._2.assignmentPartId) + val msgRaw = + """Unknown assignment part id: %s + |Valid part ids are: %s + | + |In order to grade a project, the `partIdOfGradingProject` setting has to be defined. If you are running + |interactively in the sbt console, type `set (partIdOfGradingProject in submissionProject) := "idString"`. + |When running the grading task from the command line, add the above `set` command, e.g. execute + | + | sbt 'set (partIdOfGradingProject in submissionProject) := "idString"' submission/grade""" + val msg = msgRaw.stripMargin.format(partId, validIds.mkString(", ")) + "\n " + GradingFeedback.downloadUnpackFailed(msg) + sys.error(msg) + } + } + + val setMaxScore = TaskKey[Unit]("setMaxScore") + val setMaxScoreSetting = setMaxScore <<= (gradeProjectDetails) map { project => + GradingFeedback.setMaxScore(project.maxScore, project.styleScoreRatio) + } + + // set the maximal score before running compile / test / ... + val setMaxScoreHook = (compile in Compile) <<= (compile in Compile).dependsOn(setMaxScore) + + + /************************************************************ + * DOWNLOADING AND EXTRACTING SUBMISSION + */ + + val getSubmission = TaskKey[Unit]("getSubmission") + val getSubmissionSetting = getSubmission <<= (baseDirectory, scalaSource in Compile) map { (baseDir, scalaSrcDir) => + readAndUnpackSubmission(baseDir, scalaSrcDir) + } + + def readAndUnpackSubmission(baseDir: File, targetSourceDir: File) { + try { + val jsonFile = baseDir / Settings.submissionJsonFileName + val targetJar = baseDir / Settings.submissionJarFileName + val res = for { + queueResult <- { + if (Settings.offlineMode) { + println("[not unpacking from json file]") + QueueResult("").successNel + } else { + CourseraHttp.readJsonFile(jsonFile, targetJar) + } + } + _ <- { + GradingFeedback.apiState = queueResult.apiState + CourseraHttp.unpackJar(targetJar, targetSourceDir) + } + } yield () + + res match { + case Failure(msgs) => + GradingFeedback.downloadUnpackFailed(msgs.list.mkString("\n")) + case _ => + () + } + } catch { + case e: Throwable => + // generate some useful feedback in case something fails + GradingFeedback.downloadUnpackFailed(CourseraHttp.fullExceptionString(e)) + throw e + } + if (GradingFeedback.isFailed) failDownloadUnpack() + } + + // dependsOn makes sure that `getSubmission` is executed *before* `unmanagedSources` + val getSubmissionHook = (unmanagedSources in Compile) <<= (unmanagedSources in Compile).dependsOn(getSubmission) + + def failDownloadUnpack(): Nothing = { + sys.error("Download or Unpack failed") + } + + /************************************************************ + * READING COMPILATION AND TEST COMPILATION LOGS + */ + + + // extraLoggers need to be defined globally. (extraLoggers in Compile) does not work - sbt only + // looks at the global extraLoggers when creating the LogManager. + val submissionLoggerSetting = extraLoggers ~= { currentFunction => + (key: ScopedKey[_]) => { + new FullLogger(RecordingLogger) +: currentFunction(key) + } + } + + val readCompileLog = (compile in Compile) <<= (compile in Compile) mapR handleFailure(compileFailed) + val readTestCompileLog = (compile in Test) <<= (compile in Test) mapR handleFailure(compileTestFailed) + + def handleFailure[R](handler: (Incomplete, String) => Unit) = (res: Result[R]) => res match { + case Inc(inc) => + // Only call the handler of the task that actually failed. See comment in GradingFeedback.failed + if (!GradingFeedback.isFailed) + handler(inc, RecordingLogger.readAndClear()) + throw inc + case Value(v) => v + } + + def compileFailed(inc: Incomplete, log: String) { + GradingFeedback.compileFailed(log) + } + + def compileTestFailed(inc: Incomplete, log: String) { + GradingFeedback.testCompileFailed(log) + } + + + /************************************************************ + * RUNNING SCALATEST + */ + + /** The submission project takes resource files from the main (assignment) project */ + val resourcesFromAssignment = { + (resourceDirectory in Compile) <<= (resourceDirectory in (assignmentProject, Compile)) + } + + /** + * Only include the resource files which are defined in the package of the current project. + */ + val selectResourcesForProject = { + (resources in Compile) <<= (resources in Compile, resourceDirectory in (assignmentProject, Compile), gradeProjectDetails) map { (resources, resourceDir, project) => + val finder = resources ** filter(resourceDir, List(project.packageName)) + finder.get + } + } + + /** The submission project takes test files from the main (assignment) project */ + val testSourcesFromAssignment = { + (sourceDirectory in Test) <<= (sourceDirectory in (assignmentProject, Test)) + } + + /** + * Only include the test files which are defined in the package of the current project. + * Also keeps test sources in packages listed in 'gradingTestPackages' + */ + val selectTestsForProject = { + (unmanagedSources in Test) <<= (unmanagedSources in Test, scalaSource in (assignmentProject, Test), gradingTestPackages in assignmentProject, gradeProjectDetails) map { (sources, testSrcScalaDir, gradingSrcs, project) => + val finder = sources ** filter(testSrcScalaDir, gradingSrcs :+ project.packageName) + finder.get + } + } + + val scalaTestSubmission = TaskKey[Unit]("scalaTestSubmission") + val scalaTestSubmissionSetting = scalaTestSubmission <<= + (compile in Compile, + compile in Test, + fullClasspath in Test, + copyResources in Compile, + classDirectory in Test, + baseDirectory) map { (_, _, classpath, resources, testClasses, basedir) => + // we use `map`, so this is only executed if all dependencies succeed. no need to check `GradingFeedback.isFailed` + val outfile = basedir / Settings.testResultsFileName + val policyFile = basedir / ".." / Settings.policyFileName + ScalaTestRunner.scalaTestGrade(classpath, testClasses, outfile, policyFile, copiedResourceFiles(resources)) + } + + + + /************************************************************ + * STYLE CHECKING + */ + + val styleCheckSubmission = TaskKey[Unit]("styleCheckSubmission") + + /** + * - depend on scalaTestSubmission so that test get executed before style checking. the transitive + * dependencies also ensures that the "sources in Compile" don't have compilation errors + * - using `map` makes this task execute only if all its dependencies succeeded. + */ + val styleCheckSubmissionSetting = styleCheckSubmission <<= (sources in Compile, scalaTestSubmission) map { (sourceFiles, _) => + val (feedback, score) = StyleChecker.assess(sourceFiles) + if (score == StyleChecker.maxResult) { + GradingFeedback.perfectStyle() + } else { + val gradeScore = GradingFeedback.maxStyleScore * score / StyleChecker.maxResult + GradingFeedback.styleProblems(feedback, gradeScore) + } + } + + + + /************************************************************ + * SUBMITTING GRADES TO COURSERA + */ + + val grade = TaskKey[Unit]("grade") + + // mapR: submit the grade / feedback in any case, also on failure + val gradeSetting = grade <<= (scalaTestSubmission, styleCheckSubmission, apiKey, gradeProjectDetails, streams) mapR { (_, _, apiKeyR, projectDetailsR, s) => + val logOpt = s match { + case Value(v) => Some(v.log) + case _ => None + } + logOpt.foreach(_.info(GradingFeedback.feedbackString(html = false))) + apiKeyR match { + case Value(apiKey) if (!apiKey.isEmpty) => + // if build failed early, we did not even get the api key from the submission queue + if (!GradingFeedback.apiState.isEmpty && !Settings.offlineMode) { + val scoreString = "%.2f".format(GradingFeedback.totalScore) + val Value(projectDetails) = projectDetailsR + CourseraHttp.submitGrade(GradingFeedback.feedbackString(), scoreString, GradingFeedback.apiState, apiKey, projectDetails) match { + case Failure(msgs) => + sys.error(msgs.list.mkString("\n")) + case _ => + () + } + } else if(Settings.offlineMode) { + logOpt.foreach(_.info(" \nSettings.offlineMode enabled, not uploading the feedback")) + } else { + sys.error("Could not submit feedback - apiState not initialized") + } + case _ => + sys.error("Could not submit feedback - apiKey not defined: "+ apiKeyR) + } + } +} + +case class ProjectDetails(packageName: String, + assignmentPartId: String, + maxScore: Double, + styleScoreRatio: Double, + courseId: String) |