RxScala – Reactive Extensions for Scala
RxScala is a library for composing asynchronous and event-based programs using observable sequences.
RxScala is open sourced and available under the Apache License, Version 2.0
Questions tagged [rx-scala]
91 questions
1
vote
0 answers
Observable's events not received
I have a variable called responses of type Observable[Try[Int]] that emits either:
Success(n), where n is a natural number
or
Failure(Exception)
I am summing the values of this observable like this:
val sum = responses.foldLeft(0) { (acc, tn) =>
…
bsky
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1
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1 answer
Subscription without any parameters
I need to write some RxScala code that creates an Observable from a text field in Scala Swing.
After looking on Github, I wrote this code, which seems to work:
def textValues: Observable[String] = Observable.create[String](observer => {
…
bsky
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1
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2 answers
Observables created at time interval
I was looking at the RxScala observables which are created at a given time interval:
val periodic: Observable[Long] = Observable.interval(100 millis)
periodic.foreach(x => println(x))
If I put this in a worksheet, I get this result:
periodic:…
bsky
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1
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1 answer
Calling (overloaded) RxJava functions from Scala
I wanted to create an Observable from an array of Observables like this:
package rxtest
import concurrent._
import concurrent.ExecutionContext.Implicits.global
import rx.lang.scala._
import rx.lang.scala.JavaConversions._
import…
user2595776
- 304
- 1
- 10
1
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1 answer
How to use custom Scheduler in RxScala?
I attempt with
val executors = Executors.newSingleThreadExecutor()
val scheduler = Schedulers.from(executors)
Observable.just[Int](1,2,3).subscribeOn(scheduler)
output a error
Error:(103, 43) type mismatch;
found : rx.Scheduler
required:…
LoranceChen
- 2,453
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1
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1 answer
How to cancel a mapped Observable with specify condition at RxScala/Java?
original observable ------a-------b-------c----------d-------->....
mapped observable -----A-------B(finish)
Simple code as this:
val original = Observable.just('a', 'b', 'c', 'd')
val mapped = original.map(x => x.toUpper)
//how to let…
LoranceChen
- 2,453
- 2
- 22
- 48
1
vote
1 answer
RxJava/RxScala backpressure using request
I am having an issue using RxJava backpressure. Basically, I have one producer that produces more items than the consumer can handle and want to have some buffer queue to handle only items that I can deal with, and request when I complete some of…
proximator
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1
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0 answers
How to unsubscribe all observers from the observable side?
With rxscala, we can subscribe on the observables like this:
val stream = Observable.just(1, 2, 3)
stream.subscribe(x => doSomething(x))
stream.subscribe(x => doSomething(x))
stream.subscribe(x => doSomething(x))
stream.subscribe(x =>…
Freewind
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1
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1 answer
How to construct a Observable with custom numbers and different delays?
In order to test my reactive program with rxscala, I need to construct such an Observable:
val numberStream: Observable[Int] = Observable.???()
which
publishes number 1
then waits for 1s
publishes number 4
then waits for 3s
publishes number…
Freewind
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1
vote
2 answers
Terminate Observable by timeout
I'm trying to limit life of observable by timeout:
def doLongOperation() = {
Thread.sleep(duration)
"OK"
}
def firstStep = Observable.create(
(observer: Observer[String]) => {
observer.onNext(doLongOperation())
…
Nyavro
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1
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1 answer
How to update an observable manually?
I'm newbie to reactivex and rxscala, and can create an Observable like this:
val observable = Observable[String] { subscriber =>
subscriber.onNext("something")
}
I can put new strings to the subscriber inside the Observable.apply.
Is it…
Freewind
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1
vote
1 answer
How do you use RxScala in Intellij Idea 14?
I've just recently started coding in Scala and I want to start working with RxScala but I haven't been able to figure out how to import it into Intellij. Does anyone know how to do this, I've spent the last few hours trying to figure this out and…
Ryan Wilson
- 1,743
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1
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1 answer
Database Polling using RxScala
TableEntriesI'm starting out with RxScala and I'm trying to come up with a polling mechanism that checks the database for every interval (say 20 seconds), to check if there was any change in some of the rows in the table.
object MyDatabaseService…
joesan
- 13,963
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1
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1 answer
Problems when merging a sampled Observable
I'm using rx-scala, which is a subproject of rx-java. I'll be using Scala syntax and hope that everyone understands.
I'm encountering odd behavior, and I don't know whether it's a bug or misusage of rx operators on my behalf.
Problem Statement
I…
ziggystar
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1
vote
2 answers
RxScala: How to keep the thread doing Observable.interval alive?
I am trying to write a simple RxScala program:
import rx.lang.scala.Observable
import scala.concurrent.duration.DurationInt
import scala.language.{implicitConversions, postfixOps}
object Main {
def main(args: Array[String]): Unit = {
val o =…
Binil Thomas
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