monix.reactive.internal.operators.TakeUntilObservable.scala Maven / Gradle / Ivy
/*
* Copyright (c) 2014-2020 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 monix.reactive.internal.operators
import monix.execution.Ack.Stop
import monix.execution.cancelables.{CompositeCancelable, SingleAssignCancelable}
import monix.execution.{Ack, Cancelable}
import monix.reactive.Observable
import monix.reactive.observers.Subscriber
import scala.concurrent.Future
/** Implementation for [[monix.reactive.Observable.takeUntil]]. */
private[reactive] final class TakeUntilObservable[+A](source: Observable[A], trigger: Observable[Any])
extends Observable[A] {
def unsafeSubscribeFn(out: Subscriber[A]): Cancelable = {
val mainConn = SingleAssignCancelable()
var isComplete = false
val selectorConn = trigger.unsafeSubscribeFn(new Subscriber.Sync[Any] {
implicit val scheduler = out.scheduler
def onNext(elem: Any): Ack = {
signalComplete(null)
Stop
}
def onComplete(): Unit = signalComplete(null)
def onError(ex: Throwable): Unit = signalComplete(ex)
private def signalComplete(ex: Throwable): Unit =
mainConn.synchronized {
if (!isComplete) {
isComplete = true
mainConn.cancel()
if (ex == null) out.onComplete()
else out.onError(ex)
} else if (ex != null) {
scheduler.reportFailure(ex)
}
}
})
mainConn := source.unsafeSubscribeFn(new Subscriber[A] {
implicit val scheduler = out.scheduler
def onNext(elem: A): Future[Ack] =
mainConn.synchronized {
if (isComplete) Stop
else
out.onNext(elem).syncOnStopOrFailure { _ =>
mainConn.synchronized {
isComplete = true
selectorConn.cancel()
}
}
}
def onError(ex: Throwable): Unit = signalComplete(ex)
def onComplete(): Unit = signalComplete(null)
def signalComplete(ex: Throwable): Unit =
mainConn.synchronized {
if (!isComplete) {
isComplete = true
selectorConn.cancel()
if (ex == null) out.onComplete()
else out.onError(ex)
}
}
})
CompositeCancelable(mainConn, selectorConn)
}
}