zio.interop.javaz.scala Maven / Gradle / Ivy
package zio.interop
/*
* Copyright 2017-2024 John A. De Goes and the ZIO Contributors
*
* 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.
*/
import zio._
import zio.stacktracer.TracingImplicits.disableAutoTrace
import _root_.java.nio.channels.CompletionHandler
import _root_.java.util.concurrent._
import scala.concurrent.ExecutionException
private[zio] object javaz {
def asyncWithCompletionHandler[T](op: CompletionHandler[T, Any] => Any)(implicit trace: Trace): Task[T] =
ZIO.isFatalWith[Any, Throwable, T] { isFatal =>
ZIO.async { k =>
val handler = new CompletionHandler[T, Any] {
def completed(result: T, u: Any): Unit = k(ZIO.succeed(result))
def failed(t: Throwable, u: Any): Unit = t match {
case e if !isFatal(e) => k(ZIO.fail(e))
case _ => k(ZIO.die(t))
}
}
try {
op(handler)
} catch {
case e if !isFatal(e) => k(ZIO.fail(e))
}
}
}
private def catchFromGet(
isFatal: Throwable => Boolean
)(implicit trace: Trace): PartialFunction[Throwable, Task[Nothing]] = {
case e: CompletionException =>
ZIO.fail(e.getCause)
case e: ExecutionException =>
ZIO.fail(e.getCause)
case _: InterruptedException =>
ZIO.interrupt
case _: CancellationException =>
ZIO.interrupt
case e if !isFatal(e) =>
ZIO.fail(e)
}
def unwrapDone[A](isFatal: Throwable => Boolean)(f: Future[A])(implicit trace: Trace): Task[A] =
try {
Exit.succeed(f.get())
} catch catchFromGet(isFatal)
def fromCompletionStage[A](thunk: => CompletionStage[A])(implicit trace: Trace): Task[A] =
ZIO.uninterruptibleMask { restore =>
ZIO.attempt(thunk).flatMap { cs =>
ZIO.isFatalWith { isFatal =>
val cf = cs.toCompletableFuture
if (cf.isDone) {
unwrapDone(isFatal)(cf)
} else {
restore {
ZIO.asyncInterrupt[Any, Throwable, A] { cb =>
val _ = cs.handle[Unit] { (v: A, t: Throwable) =>
val io = Option(t).fold[Task[A]](ZIO.succeed(v)) { t =>
catchFromGet(isFatal).lift(t).getOrElse(ZIO.die(t))
}
cb(io)
}
Left(ZIO.succeed(cf.cancel(false)))
}
}.onInterrupt(ZIO.succeed(cf.cancel(false)))
}
}
}
}
/**
* WARNING: this uses the blocking Future#get, consider using
* `fromCompletionStage`
*/
def fromFutureJava[A](thunk: => Future[A])(implicit trace: Trace): Task[A] =
ZIO.uninterruptibleMask { restore =>
ZIO.attempt(thunk).flatMap { future =>
ZIO.isFatalWith { isFatal =>
if (future.isDone) {
unwrapDone(isFatal)(future)
} else {
restore {
ZIO.blocking(ZIO.suspend(unwrapDone(isFatal)(future)))
}.onInterrupt(ZIO.succeed(future.cancel(false)))
}
}
}
}
/**
* CompletableFuture#failedFuture(Throwable) available only since Java 9
*/
object CompletableFuture_ {
def failedFuture[A](e: Throwable): CompletableFuture[A] = {
val f = new CompletableFuture[A]
f.completeExceptionally(e)
f
}
}
}