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| /* | ||
| * Copyright (c) 2014-2018 by The Monix Project Developers. | ||
| * See the project homepage at: https://monix.io | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package bloop.monix | ||
|
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| import java.util.concurrent.{CancellationException, CompletableFuture, CompletionException} | ||
| import java.util.function.BiFunction | ||
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| import monix.execution.cancelables.SingleAssignmentCancelable | ||
| import monix.execution.misc.NonFatal | ||
| import monix.execution.schedulers.TrampolinedRunnable | ||
| import monix.execution.{Cancelable, CancelableFuture} | ||
|
|
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| import scala.concurrent.{ExecutionContext, Future, Promise} | ||
| import scala.util.{Failure, Success, Try} | ||
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| /** Utilities for integration with Java 8 classes | ||
| * | ||
| * Provides methods to convert between `scala.concurrent.Future` | ||
| * and `java.util.concurrent.CompletableFuture`. | ||
| * | ||
| * These utilities have been copy-pasted from the following PR (only | ||
| * merged in the 3.x series): https://github.com/monix/monix/pull/584 | ||
| */ | ||
| object Java8Compat { | ||
|
|
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| /** Given a registration function that can execute an asynchronous | ||
| * process, executes it and builds a [[CancelableFuture]] value | ||
| * out of it. | ||
| * | ||
| * The given `registration` function can return a [[Cancelable]] | ||
| * reference that can be used to cancel the executed async process. | ||
| * This reference can be [[Cancelable.empty empty]]. | ||
| * | ||
| * {{{ | ||
| * def delayedResult[A](f: => A)(implicit s: Scheduler): CancelableFuture[A] = | ||
| * CancelableFuture.async { complete => | ||
| * val task = s.scheduleOnce(10.seconds) { complete(Try(f)) } | ||
| * | ||
| * Cancelable { () => | ||
| * println("Cancelling!") | ||
| * task.cancel() | ||
| * } | ||
| * } | ||
| * }}} | ||
| * | ||
| * This is much like working with Scala's | ||
| * [[scala.concurrent.Promise Promise]], only safer. | ||
| */ | ||
| def async[A](register: (Try[A] => Unit) => Cancelable)( | ||
| implicit ec: ExecutionContext): CancelableFuture[A] = { | ||
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| val p = Promise[A]() | ||
| val cRef = SingleAssignmentCancelable() | ||
|
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| // Light async boundary to guard against stack overflows | ||
| ec.execute(new TrampolinedRunnable { | ||
| def run(): Unit = { | ||
| try { | ||
| cRef := register(p.complete) | ||
| } catch { | ||
| case e if NonFatal(e) => | ||
| if (!p.tryComplete(Failure(e))) | ||
| ec.reportFailure(e) | ||
| } | ||
| } | ||
| }) | ||
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| CancelableFuture(p.future, cRef) | ||
| } | ||
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| implicit class JavaCompletableFutureUtils[A](val source: CompletableFuture[A]) extends AnyVal { | ||
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| /** Convert `CompletableFuture` to [[monix.execution.CancelableFuture]] | ||
| * | ||
| * If the source is cancelled, returned `Future` will never terminate | ||
| */ | ||
| def asScala(implicit ec: ExecutionContext): CancelableFuture[A] = | ||
| async(cb => { | ||
| source.handle[Unit](new BiFunction[A, Throwable, Unit] { | ||
| override def apply(result: A, err: Throwable): Unit = { | ||
| err match { | ||
| case null => | ||
| cb(Success(result)) | ||
| case _: CancellationException => | ||
| () | ||
| case ex: CompletionException if ex.getCause ne null => | ||
| cb(Failure(ex.getCause)) | ||
| case ex => | ||
| cb(Failure(ex)) | ||
| } | ||
| } | ||
| }) | ||
| Cancelable(() => {source.cancel(true); ()}) | ||
| }) | ||
| } | ||
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| implicit class ScalaFutureUtils[A](val source: Future[A]) extends AnyVal { | ||
|
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| /** Convert Scala `Future` to Java `CompletableFuture` | ||
| * | ||
| * NOTE: Cancelling resulting future will not have any | ||
| * effect on source | ||
| */ | ||
| def asJava(implicit ec: ExecutionContext): CompletableFuture[A] = { | ||
| val cf = new CompletableFuture[A]() | ||
| source.onComplete { | ||
| case Success(a) => | ||
| cf.complete(a) | ||
| case Failure(ex) => | ||
| cf.completeExceptionally(ex) | ||
| } | ||
| cf | ||
| } | ||
| } | ||
| } |
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