monix.reactive.internal.operators.MaterializeOperator.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
import monix.execution.Ack.Continue
import monix.reactive.Notification
import monix.reactive.Notification.{OnComplete, OnError, OnNext}
import monix.reactive.Observable.Operator
import monix.reactive.observers.Subscriber
import scala.concurrent.Future
private[reactive] final class MaterializeOperator[A] extends Operator[A, Notification[A]] {
def apply(out: Subscriber[Notification[A]]): Subscriber[A] =
new Subscriber[A] {
implicit val scheduler = out.scheduler
private[this] var isDone = false
private[this] var ack: Future[Ack] = Continue
def onNext(elem: A): Future[Ack] = {
ack = out.onNext(OnNext(elem))
ack
}
def onError(ex: Throwable): Unit =
if (!isDone) {
isDone = true
ack.syncOnContinue {
out.onNext(OnError(ex))
out.onComplete()
}
}
def onComplete(): Unit =
if (!isDone) {
isDone = true
ack.syncOnContinue {
out.onNext(OnComplete)
out.onComplete()
}
}
}
}