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Questions tagged [monix]

Monix is a library providing asynchronous programming facilities for Scala and Scala.js.

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Monix task handle failure for list of futures

How can I handle the failure during the asynchronous execution of the task? I.e. at least print the stack trace and shut down. The code below seems to wait forever for input > 5 val things = Range(1, 40) implicit val scheduler =…
Georg Heiler
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Circuit breaker monix with Http request

I´m struggling to make the Circuit breaker of Monix works async with some request that I´m receiving in my service, and that are failing, so it should activate the Circuit breaker, and even when is open it must render the request. Here my code …
paul
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Atomic compareAndSet parameters are evaluated even if it's not used

I have the following code that set the Atomic variable (both java.util.concurrent.atomic and monix.execution.atomic behaves the same: class Foo { val s = AtomicAny(null: String) def foo() = { println("called") /* Side Effects */ …
SwiftMango
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I get inconsistent results from Monix firstOptionL - race condition?

I get an intermittent missing value from repeated calls to the same (MongoDB) database call which I've converted into an Observable. I've removed all database code to get a minimal test case which only has the Monix bits and I'm still missing values…
ElaineC
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Converting from Task[Either[A, Task[B]]] to Task[Either[A, B]]

I am using monix for side effects and ended with this type Task[Either[A, Task[B]]], Is there a way to get Task[Either[A, B]]? So far all I could do is convert Task[Either[A, Task[B]]] to Task[Any], basically removing Either using pattern matching…
Satya
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How to handle errors and keep an Observable alive in .mapParallelUnordered

I am using Monix 3 and have a kind of this code: Observable.fromIterable(Seq(1, 2, 3, 4, 5, 6, 7, 8, 9)) .flatMap(i => if (i % 2 == 0) { // Bad i Observable.empty } else Observable.pure(i) ) .foreachL(i =>…
Oleg
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monix: Task.executeWithFork prevents execution?

I can't figure out why adding executeWithFork prevents task from running in the following example: import java.util.concurrent.TimeUnit import monix.execution.schedulers.SchedulerService import monix.reactive.subjects.ConcurrentSubject object…
eprst
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Why Monix Observable produces one element more than needed

I'm playing with Monix streams and got the example where I build Observable from Iterator. It seems to me like when run it produces 1 more element than I'd expect. The following code shows that: val count = AtomicLong(0) def produceValue(): Long…
Michal Ostruszka
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Replay cached items in reverse order on subscribe

I have a ConnectableObservable which upon subscribe, will replay the last x items in their original order (oldest to newest) and any subsequent events after. I am using this Observable as the backing store for an event blotter, however upon…
Cheetah
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Scala Cats: tail recursive tailRecM method for Monad Instance of Task[Validated[String,?]

In cats, when a Monad is created using the Monad trait, ideally a tail-recursive implementation for method tailRecM should be provided to ensure stack safety. I am using the tagless final approach and wish to have an effect of Task[Validated[String,…
Simon Morgan
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Type alias and implicit value resolution

I assume this is an easy one but I’m running into problem where the FlatMap or Functor of a Monix Task cannot be found. I use a "type alias" to simplify a long type signiture but then in the for-comprehession I receive a "could not find implicit…
Adam Wayland
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In Scala Monix Scheduler how to propagate exceptions to main program?

I have a Monix Scheduler that scheduling error-prone task: import scala.concurrent.duration._ import monix.eval.Task import monix.execution.Scheduler import java.time._ scheduler.scheduleWithFixedDelay(0.seconds, 1.seconds) { …
WeiChing 林煒清
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How can the caller Task avoid having it's scheduler changed by a sub task that it flatMap's over

I'm looking for a way in which a Task (i.e. outer scope) could execute a "subTask" using flatMap or something equivalent and make sure that any subsequent chained calls in the outer scope use the original scheduler. Libraries and scala used: scala…
Aurel Paulovic
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Scala Monix , how to kill running or scheduled Task

Im using Monix for asynchronous task workflow. How do we kill a running Task ? Task{ println("sleep") Thread.sleep(200) println("effect") } .doOnCancel(Task(println("canceled"))) .timeout(100.milli) // timeout will do…
WeiChing 林煒清
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Usage of Monix Debounce Observable

I'm trying out some of the operations that I could do on the Observable from Monix. I came across this debounce operator and could not understand its behavior: Observable.interval(5.seconds).debounce(2.seconds) This one above just emits a Long…
joesan
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