monifu.reactive.internals.operators.throttle.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.reactive.Ack.Continue
import monifu.reactive.{Ack, Observer, Observable}
import scala.concurrent.Future
import scala.concurrent.duration.FiniteDuration
private[reactive] object throttle {
/** Implementation for [[Observable.throttleFirst]] */
def first[T](self: Observable[T], interval: FiniteDuration): Observable[T] =
Observable.create { subscriber =>
implicit val s = subscriber.scheduler
val downstream = subscriber.observer
self.onSubscribe(new Observer[T] {
private[this] val intervalMs = interval.toMillis
private[this] var nextChange = 0L
def onNext(elem: T): Future[Ack] = {
val rightNow = s.currentTimeMillis()
if (nextChange <= rightNow) {
nextChange = rightNow + intervalMs
downstream.onNext(elem)
}
else
Continue
}
def onError(ex: Throwable): Unit = {
downstream.onError(ex)
}
def onComplete(): Unit = {
downstream.onComplete()
}
})
}
}