monix.reactive.internal.operators.ExecuteOnObservable.scala Maven / Gradle / Ivy

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/*
 * Copyright (c) 2014-2016 by its authors. Some rights reserved.
 * 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.cancelables.SingleAssignmentCancelable
import monix.execution.{Ack, Cancelable, Scheduler}
import monix.reactive.Observable
import monix.reactive.observers.Subscriber
import scala.concurrent.Future

private[reactive] final
class ExecuteOnObservable[+A](source: Observable[A], s: Scheduler)
  extends Observable[A] {

  def unsafeSubscribeFn(out: Subscriber[A]): Cancelable = {
    val subscription = SingleAssignmentCancelable()

    s.execute(new Runnable {
      def run(): Unit =
        subscription := source.unsafeSubscribeFn(
          new Subscriber[A] {
            implicit val scheduler: Scheduler = s
            def onError(ex: Throwable): Unit = out.onError(ex)
            def onComplete(): Unit = out.onComplete()
            def onNext(elem: A): Future[Ack] = out.onNext(elem)
        })
    })

    subscription
  }
}