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
2
votes
1 answer
Scalaz vs ReactiveX
I´ve been working for a couple years with ReactiveX extension in Java, but now I move to scala, and I´ve seen that many people use the extension ScalaZ to perform more functional programing in Scala.
Is there´s any differences to use ScalaZ…
paul
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2
votes
1 answer
Observable takes infinite amount of memory?
Since each Observable has a cache which can be traced back to the very first emitted value it seems an amount of memory used to store this cache is not bounded.
I've tested this assumption with the following code: …
src091
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2
votes
1 answer
RxJava/RxScala async code inside Observer.onNext
Let's assume that you want to store events from some stream into the database and a client library to that database is asynchronous.
E.g. there is a method writeEvent(event: MyEvent): Future[Boolean] that you have to call inside onNext of your…
Magomed Abdurakhmanov
- 1,814
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2
votes
3 answers
Convert RxJava Observable to RxScala Observable
I am writing a small JavaFx application in Scala and I like to use RxScala and RxJavaFx for this. With the following code I get a RxJava Observable:
JavaFxObservable.fromObservableValue(textfield.textProperty())
Obviously, as I write in Scala, I…
RvanHeest
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2
votes
2 answers
How to produce one Observable from another
Let's say we have source Observable of Ints:
val source:Observable[Int]
I would like to create another Observable, producing values whose difference to first appeared value at source is greater than 10:
def detect() = Observable[Int](
subscriber…
Nyavro
- 8,806
- 2
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- 33
2
votes
1 answer
Reactive Extensions (Rx) in Scala - execute a method after a given interval
Since I'm quite new to Reactive Extensions, I was curious about the following things.
By using Rx in Scala, I want to be able to call a method that retrieves content from an API every second.
So far, I've taken a look at the creational operators…
dsafa
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2
votes
2 answers
Observable Exception handling
I'm learning RxScala and came to this very synthetic snippet. I'm trying to handle exception in onError block:
def doLongOperation():String = {
(1 to 10).foreach {
_ =>
Thread.sleep(100)
print(".")
}
println()
if…
Nyavro
- 8,806
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2
votes
2 answers
RxScala Observables vs Play Framework Enumerators
How does using Play Frameworks Enumerators, Iteratees, and Enumeratees, compare to using RxScalas Observables, Subscriptions, etc… for asynchronous data flows?
In what type of scenarios would you choose to use RxScala, and when would you choose…
zunior
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2
votes
1 answer
RxScala Observable never runs
With the following build.sbt:
name := "blah"
version := "1.0"
scalaVersion := "2.11.6"
libraryDependencies ++= Seq("io.reactivex" % "rxscala_2.11" % "0.24.1", "org.scalaj" %% "scalaj-http" % "1.1.4")
and this code:
import…
Alex
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1
vote
1 answer
How to build an Observable out of individual computation steps with RxScala/RxJava?
I currently have the following code:
def method(): Future[State] = Future {
// some processing
State.Completed
}
But now I've noticed that I actually want to "publish" a set of intermediate states instead:
def method(): Observable[State] = ? {
…
devoured elysium
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1
vote
1 answer
RxScala/Java - Why is my progressBar not showing up?
I have a simple app with a SearchView that users can query and depending on the state I'm showing/hiding some view widgets. I'm having trouble finding out why the ProgressBar is never visible. Can someone say why the loading indicator is never…
user3350744
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1
vote
0 answers
Why doesn't the Scala compiler infere the parameter type when subscribing to a Flowable with RxScala in Android?
I'm trying to get started with RxJava2, RxScala and Android. I found a little example online which I tried to translate into Scala. But the Scala compiler can't figure out the type here:
MainIntent.scala:7:missing parameter type
[error] …
user3350744
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- 12
1
vote
1 answer
What is the best practice for managing subscriptions in RxScala?
I want to control the scope for my subscriptions and even in the presence of exceptions while avoiding using var for my subscriptions
In Rx/F# I would do this
use subscription = Observable.subscribe ...
and the subscription is automatically…
vidi
- 2,056
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1
vote
1 answer
RxScala ConnectableObservable.doOnSubscribe is never called?
val observable = Observable(...)
.publish
val subscription = observable.connect
observable.doOnsubscribe(() => doSomething)
.subscribe()
The doSomething is never called. The exact same code for RxJava was working properly. It seems for…
Wins
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1
vote
1 answer
Turn TCP socket to Observable of Array[Byte]
In my Android app I need to use a Socket to send and receive arrays of bytes. For convenience sake I want to work with Observable connected to a Socket.
Looking on the internet I've found this code:
import rx.lang.scala.Observable
val s =…
src091
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