monifu.reactive.internals.operators.repeat.scala Maven / Gradle / Ivy
/*
* Copyright (c) 2014-2015 by its authors. Some rights reserved.
* See the project homepage at: http://www.monifu.org
*
* 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 monifu.reactive.internals.operators
import monifu.concurrent.Scheduler
import monifu.reactive.subjects.ReplaySubject
import monifu.reactive.{Ack, Observable, Observer, Subject}
import scala.concurrent.Future
private[reactive] object repeat {
/**
* Implementation for [[Observable.repeat]].
*/
def apply[T](source: Observable[T]): Observable[T] = {
// recursive function - subscribes the observer again when
// onComplete happens
def loop(subject: Subject[T, T], observer: Observer[T])(implicit s: Scheduler): Unit =
subject.onSubscribe(new Observer[T] {
def onNext(elem: T) = {
observer.onNext(elem)
}
def onError(ex: Throwable) =
observer.onError(ex)
def onComplete(): Unit =
loop(subject, observer)
})
Observable.create { subscriber =>
implicit val s = subscriber.scheduler
val observer = subscriber.observer
val subject = ReplaySubject[T]()
loop(subject, observer)
source.onSubscribe(new Observer[T] {
def onNext(elem: T): Future[Ack] = {
subject.onNext(elem)
}
def onError(ex: Throwable): Unit = {
subject.onError(ex)
}
def onComplete(): Unit = {
subject.onComplete()
}
})
}
}
}