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QUESTION
Is flatMap on Flux always sequential? I know that It is not sequential when then function used in flatMap return flux. project-reactor flatMap
But if the function used in flatMap returns mono, would it be always sequential?
Say I have a function that takes an object and returns only Mono.
...ANSWER
Answered 2020-Nov-19 at 08:23No, a flatMap
is not sequential. A flatMap
subscribes eagerly to the inner streams. Here is a summary of how it works:
- Receive an event from upstream.
- Create an inner stream out of it.
- Subscribe to it.
- Receive the next event from upstream.
- Repeat from 2.
- Merge events from all of these inner streams.
Since these inner subscriptions happen in parallel, there is no guarantee on which inner stream will emit an onComplete
first. Therefore, there is no ordering guarantee.
concatMap
on the other hand gives ordering guarantee (in the exact order as it receives events from upstream). This is because it subscribes to the next stream only after the previous stream has emitted an onComplete
.
Here's an article I wrote on flatMap
a while back:
https://medium.com/swlh/understanding-reactors-flatmap-operator-a6a7e62d3e95
Note: It's highly likely that you'll see 2,3,4,5 in the output. This happens as your calls are synchronous. But there is no guarantee, and you should never rely on flatMap
for any sort of ordering requirements.
QUESTION
Can you convert this reactive method to an Arrow Fx Project Reactor monad comprehension?
...ANSWER
Answered 2020-Nov-08 at 14:46You should convert all operations to Flux then, in your case clientRepository.findById(clientId).toFlux().k()
Also, you don't need to throw that exception to break the chain.
QUESTION
I'm calling an API which returns xml response with content-type "text/html" When I try to parse the response in xml class, I'm getting the error message:
...ANSWER
Answered 2020-Oct-30 at 01:00Jaxb2XmlDecoder default constructor doesn't have "text/html" by default. You need to pass it to using Jaxb2XmlDecoder(MimeType... supportedMimeTypes) For example:
QUESTION
I'm in the process of learning c# and NAudio. In my project, I need to play a series of short tones using a decay envelope. It looks like the ADSR Envelope sample provider will do this, but I can't seem to make it work with the signal generator. When I set the release time, I just get a constant tone. Can anyone tell me what I'm doing wrong? Here's a very simple console app that I'm trying to use to test this:
...ANSWER
Answered 2020-Jul-22 at 18:57So you can trigger the Release phase by calling adsr.Stop()
. This makes sense as the release phase on a keyboard happens after you release the key, but it's not particularly intuitive.
QUESTION
I'm currently messing around with a Spring Webflux microservice and trying to implement an @PatchMapping which consumes an JsonPatch object as @RequestBody like so:
...ANSWER
Answered 2020-May-26 at 17:26I'm the author of the blog post you mentioned. I'm no expert in Webflux but in this case you'll have to re-implement the JacksonConverter to the webFlux form.
So it becomes something like this:
QUESTION
I'm trying to perform frequency modulation on a signal coming from AKPlayer, which in return plays a mp3 file. I've tried to work with AKOperationEffect, but it doesn't work as expected:
...ANSWER
Answered 2020-May-14 at 22:15I took the time to create a working practical example to help you @Ulrich, you can drop and play if you have the playground environment available, or just use it as a reference trusting me it works to amend your code, it's self-explanatory but you can read more about why my version work after the code TLDR;
Before <audio>
After <audio>
The following was tested and ran without problems in the latest XCode and Swift at the time of writing (XCode 11.4, Swift 5.2 and AudioKit 4.9.5):
QUESTION
I am getting the following compilation warning:
...ANSWER
Answered 2020-Apr-29 at 21:40The toMono()
extension which you seem to be using is defined like this:
QUESTION
How to concatenate two flux with a nested one? Why this code execution never ends?
...ANSWER
Answered 2019-Nov-07 at 10:50You need to use ()
intead of {}
in concatWith()
QUESTION
I'm trying to create a pdf in memory using libre/openpdf (https://github.com/LibrePDF/OpenPDF) and spring's routerfunctions.
I have a Flux of com.lowagie.text.Element
that contain the content of the pdf.
The com.lowagie.text.pdf.PdfWriter
used, takes a com.lowagie.text.Document
and an OutputStream
. Element
s are added to the Document
and the data is written to the OutputStream
.
I need the output in the Outputstream
to be written to the body of the org.springframework.web.reactive.function.server.ServerResponse
.
I tried to solve this using the following:
...ANSWER
Answered 2019-Oct-08 at 12:34Try the then(...)
-Operator as it lets the first Mono complete and then plays another Mono.
QUESTION
I am trying to make requests using WebClient in parallel, but I have no clue how to go about that, because no matter what I do, the code is not waiting for requests to finish. If I execute just one request though (Commented fragment), everything works fine. Can someone help me with that?
...ANSWER
Answered 2019-Oct-03 at 23:32So it seems, that collectList() filters out empty mono that are returned in case the body of the response is empty. The solution is basically, either to use Mono.defaultIfEmpty() method, or change retrieve() to exchange() which always returns something. At least that's what helped me.
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