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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| package viper.gobra.frontend | ||
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| import viper.gobra.frontend.info.Info.TypeCheckMode | ||
| import viper.gobra.util.{GobraExecutionContext, Violation} | ||
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| import java.util.concurrent.{ConcurrentHashMap, ConcurrentMap} | ||
| import scala.concurrent.duration.Duration | ||
| import scala.concurrent.{Await, Future, Promise} | ||
| import scala.util.{Failure, Success} | ||
| import scala.jdk.CollectionConverters._ | ||
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| trait Job[R] { | ||
| private var compututationStarted = false | ||
| private val promise: Promise[R] = Promise() | ||
| def getFuture: Future[R] = promise.future | ||
| protected def compute(): R | ||
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| def call(): R = { | ||
| getFuture.value match { | ||
| case Some(Success(res)) => return res // return already computed type-checker result | ||
| case Some(Failure(exception)) => Violation.violation(s"Job resulted in exception: $exception") | ||
| case _ => | ||
| } | ||
| Violation.violation(!compututationStarted, s"Job is already on-going") | ||
| compututationStarted = true | ||
| val res = compute() | ||
| promise.success(res) | ||
| res | ||
| } | ||
| } | ||
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| class TaskManager[K, R](config: Config) { | ||
| private val jobs: ConcurrentMap[K, Job[R]] = new ConcurrentHashMap() | ||
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| /** | ||
| * returns true if job has been inserted and thus was previously absent | ||
| */ | ||
| def addIfAbsent(id: K, job: Job[R], insertOnly: Boolean = false)(executionContext: GobraExecutionContext): Boolean = { | ||
| var isAbsent = false | ||
| // first insert job, then run it (if necessary) | ||
| jobs.computeIfAbsent(id, _ => { | ||
| isAbsent = true | ||
| job | ||
| }) | ||
| // now run it but only if it's a new job: | ||
| if (isAbsent && !insertOnly) { | ||
| config.typeCheckMode match { | ||
| case TypeCheckMode.Lazy => // don't do anything as of now | ||
| case TypeCheckMode.Sequential => job.call() | ||
| case TypeCheckMode.Parallel => Future{ job.call() }(executionContext) | ||
| } | ||
| } | ||
| isAbsent | ||
| } | ||
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| def getResult(id: K): R = { | ||
| val job = jobs.get(id) | ||
| Violation.violation(job != null, s"Task $id not found") | ||
| getResultFromJob(job) | ||
| } | ||
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| def getAllResults: Iterable[R] = | ||
| jobs.values().asScala.map(getResultFromJob) | ||
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| def getAllResultsWithKeys: Iterable[(K, R)] = | ||
| jobs.asScala.toVector.map { case (key, job) => (key, getResultFromJob(job)) } | ||
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| private def getResultFromJob(job: Job[R]): R = config.typeCheckMode match { | ||
| case TypeCheckMode.Lazy => job.call() // we perform the computation now that we need the result | ||
| case TypeCheckMode.Sequential => | ||
| // note that we cannot await the future here as type-checking of this package might not have started yet. | ||
| // Thus, we use `.call()` that either returns a previously calculated type-checking result or will calculate it. | ||
| job.call() | ||
| case TypeCheckMode.Parallel => Await.result(job.getFuture, Duration.Inf) | ||
| } | ||
| } |
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