monix.reactive.internal.operators.TakeLeftByTimespanObservable.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
import monix.execution.{Ack, Cancelable}
import monix.reactive.Observable
import monix.reactive.observers.Subscriber
import scala.concurrent.Future
import scala.concurrent.duration.FiniteDuration
private[reactive] final class TakeLeftByTimespanObservable[A](source: Observable[A], timespan: FiniteDuration)
extends Observable[A] {
def unsafeSubscribeFn(out: Subscriber[A]): Cancelable = {
val composite = CompositeCancelable()
composite += source.unsafeSubscribeFn(new Subscriber[A] with Runnable {
implicit val scheduler = out.scheduler
private[this] var isActive = true
// triggers completion
private[this] val task: Cancelable = {
val ref = scheduler.scheduleOnce(timespan.length, timespan.unit, this)
composite += ref
ref
}
def run(): Unit = onComplete()
private def deactivate(): Unit = synchronized {
isActive = false
task.cancel()
}
def onNext(elem: A): Future[Ack] = synchronized {
if (isActive)
out.onNext(elem).syncOnStopOrFailure(_ => deactivate())
else {
onComplete()
Stop
}
}
def onError(ex: Throwable): Unit = synchronized {
if (isActive) {
deactivate()
out.onError(ex)
}
}
def onComplete(): Unit = synchronized {
if (isActive) {
deactivate()
out.onComplete()
}
}
})
}
}