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-rw-r--r--src/actors/scala/actors/Future.scala243
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diff --git a/src/actors/scala/actors/Future.scala b/src/actors/scala/actors/Future.scala
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--- a/src/actors/scala/actors/Future.scala
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-/* __ *\
-** ________ ___ / / ___ Scala API **
-** / __/ __// _ | / / / _ | (c) 2005-2013, LAMP/EPFL **
-** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
-** /____/\___/_/ |_/____/_/ | | **
-** |/ **
-\* */
-
-
-package scala.actors
-
-import scala.actors.scheduler.DaemonScheduler
-import scala.concurrent.SyncVar
-
-/** A function of arity 0, returning a value of type `T` that,
- * when applied, blocks the current actor (`Actor.self`)
- * until the future's value is available.
- *
- * A future can be queried to find out whether its value
- * is already available without blocking.
- *
- * @author Philipp Haller
- */
-@deprecated("Use the scala.concurrent.Future instead. For migration from the scala.actors package refer to the Actors Migration Guide.", "2.11.0")
-abstract class Future[+T] extends Responder[T] with Function0[T] {
-
- @volatile
- private[actors] var fvalue: Option[Any] = None
- private[actors] def fvalueTyped = fvalue.get.asInstanceOf[T]
-
- /** Tests whether the future's result is available.
- *
- * @return `true` if the future's result is available,
- * `false` otherwise.
- */
- def isSet: Boolean
-
- /** Returns an input channel that can be used to receive the future's result.
- *
- * @return the future's input channel
- */
- def inputChannel: InputChannel[T]
-
-}
-
-private case object Eval
-
-private class FutureActor[T](fun: SyncVar[T] => Unit, channel: Channel[T]) extends Future[T] with DaemonActor {
-
- var enableChannel = false // guarded by this
-
- def isSet = !fvalue.isEmpty
-
- def apply(): T = {
- if (fvalue.isEmpty) {
- this !? Eval
- }
- fvalueTyped
- }
-
- def respond(k: T => Unit) {
- if (isSet) k(fvalueTyped)
- else {
- val ft = this !! Eval
- ft.inputChannel.react {
- case _ => k(fvalueTyped)
- }
- }
- }
-
- def inputChannel: InputChannel[T] = {
- synchronized {
- if (!enableChannel) {
- if (isSet)
- channel ! fvalueTyped
- enableChannel = true
- }
- }
- channel
- }
-
- def act() {
- val res = new SyncVar[T]
-
- {
- fun(res)
- } andThen {
-
- synchronized {
- val v = res.get
- fvalue = Some(v)
- if (enableChannel)
- channel ! v
- }
-
- loop {
- react {
- // This is calling ReplyReactor#reply(msg: Any).
- // Was: reply(). Now: reply(()).
- case Eval => reply(())
- }
- }
- }
- }
-}
-
-/** Methods that operate on futures.
- *
- * @author Philipp Haller
- */
-@deprecated("Use the object scala.concurrent.Future instead. For migration from the scala.actors package refer to the Actors Migration Guide.", "2.11.0")
-object Futures {
-
- /** Arranges for the asynchronous execution of `body`,
- * returning a future representing the result.
- *
- * @param body the computation to be carried out asynchronously
- * @return the future representing the result of the
- * computation
- */
- def future[T](body: => T): Future[T] = {
- val c = new Channel[T](Actor.self(DaemonScheduler))
- val a = new FutureActor[T](_.set(body), c)
- a.start()
- a
- }
-
- /** Creates a future that resolves after a given time span.
- *
- * @param timespan the time span in ms after which the future resolves
- * @return the future
- */
- def alarm(timespan: Long): Future[Unit] = {
- val c = new Channel[Unit](Actor.self(DaemonScheduler))
- val fun = (res: SyncVar[Unit]) => {
- Actor.reactWithin(timespan) {
- case TIMEOUT => res.set({})
- }
- }
- val a = new FutureActor[Unit](fun, c)
- a.start()
- a
- }
-
- /** Waits for the first result returned by one of two
- * given futures.
- *
- * @param ft1 the first future
- * @param ft2 the second future
- * @return the result of the future that resolves first
- */
- def awaitEither[A, B >: A](ft1: Future[A], ft2: Future[B]): B = {
- val FutCh1 = ft1.inputChannel
- val FutCh2 = ft2.inputChannel
- Actor.receive {
- case FutCh1 ! arg1 => arg1.asInstanceOf[B]
- case FutCh2 ! arg2 => arg2.asInstanceOf[B]
- }
- }
-
- /** Waits until either all futures are resolved or a given
- * time span has passed. Results are collected in a list of
- * options. The result of a future that resolved during the
- * time span is its value wrapped in `Some`. The result of a
- * future that did not resolve during the time span is `None`.
- *
- * Note that some of the futures might already have been awaited,
- * in which case their value is returned wrapped in `Some`.
- * Passing a timeout of 0 causes `awaitAll` to return immediately.
- *
- * @param timeout the time span in ms after which waiting is
- * aborted
- * @param fts the futures to be awaited
- * @return the list of optional future values
- * @throws java.lang.IllegalArgumentException if timeout is negative,
- * or timeout + `System.currentTimeMillis()` is negative.
- */
- def awaitAll(timeout: Long, fts: Future[Any]*): List[Option[Any]] = {
- val resultsMap: scala.collection.mutable.Map[Int, Option[Any]] = new scala.collection.mutable.HashMap[Int, Option[Any]]
-
- var cnt = 0
- val mappedFts = fts.map(ft =>
- ({cnt+=1; cnt-1}, ft))
-
- val unsetFts = mappedFts.filter((p: Tuple2[Int, Future[Any]]) => {
- if (p._2.isSet) { resultsMap(p._1) = Some(p._2()); false }
- else { resultsMap(p._1) = None; true }
- })
-
- val partFuns = unsetFts.map((p: Tuple2[Int, Future[Any]]) => {
- val FutCh = p._2.inputChannel
- val singleCase: PartialFunction[Any, Tuple2[Int, Any]] = {
- case FutCh ! any => (p._1, any)
- }
- singleCase
- })
-
- val thisActor = Actor.self
- val timerTask = new java.util.TimerTask {
- def run() { thisActor ! TIMEOUT }
- }
- Actor.timer.schedule(timerTask, timeout)
-
- def awaitWith(partFuns: Seq[PartialFunction[Any, Tuple2[Int, Any]]]) {
- val reaction: PartialFunction[Any, Unit] = new PartialFunction[Any, Unit] {
- def isDefinedAt(msg: Any) = msg match {
- case TIMEOUT => true
- case _ => partFuns exists (_ isDefinedAt msg)
- }
- def apply(msg: Any): Unit = msg match {
- case TIMEOUT => // do nothing
- case _ => {
- val pfOpt = partFuns find (_ isDefinedAt msg)
- val pf = pfOpt.get // succeeds always
- val (idx, subres) = pf(msg)
- resultsMap(idx) = Some(subres)
-
- val partFunsRest = partFuns filter (_ != pf)
- // wait on rest of partial functions
- if (partFunsRest.length > 0)
- awaitWith(partFunsRest)
- }
- }
- }
- Actor.receive(reaction)
- }
-
- if (partFuns.length > 0)
- awaitWith(partFuns)
-
- var results: List[Option[Any]] = Nil
- val size = resultsMap.size
- for (i <- 0 until size) {
- results = resultsMap(size - i - 1) :: results
- }
-
- // cancel scheduled timer task
- timerTask.cancel()
-
- results
- }
-
-}