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Questions tagged [reactive-streams]

a standard for asynchronous stream processing with non-blocking back pressure on the JVM

Reactive Streams is an initiative to provide a standard for asynchronous stream processing with non-blocking back pressure on the JVM.

http://www.reactive-streams.org/

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Receiving items from reactive stream SubmissionPublisher

I was trying out some of the new features in Java 9. So I put together a test to have a publisher, emitting numbers at a given rate. I also implemented a Subscriber to listen to those publications and just print them to console. Although I might not…
nuvio
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End-to-End Reactive Streaming RESTful service (a.k.a. Back-Pressure over HTTP)

I have been trying to clarify this question online for a while without success, so I will try to ask it here. I would like to find some resource or example where it shows how I can build an end-to-end fully back-pressured REST service + client.…
mdm
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Performance hit migrating from MongoDB Java Rx driver to reactive streams driver

We're trying to upgrade from the old RxJava-based Mongo driver mongodb-driver-rx (v1.5.0) to the newer mongodb-driver-reactivestreams (v1.13.1) - not the newest one because of dependencies, but certainly a lot newer. The old RxJava one has been…
mlkammer
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RxJava multiple consumers of one publisher

I'm writing some kind of middleware HTTP proxy with cache. The workflow is: Client requests this proxy for resource If resurce exists in cache, proxy returns it If resource wasn't found, proxy fetching remote resource and returns to the user. Proxy…
Kirill
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AMQP consumer stops receiving on 127th message

PROBLEM: The publisher app continuously publishes AMQP messages to Artemis broker - but, the consumer app stops receiving messages after the 127th. Fwiw - Coincidentally, noticed an excerpt from a Smallrye web page cites: "the default buffer size…
sairn
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In rxjs how can I create groups of sequential values?

I have a stream of values in this form: [1,2,3,1,2,1,1,1,2...] I would like to convert it to a stream of groups in the form: [[1,2,3],[1,2],[1],[1],[1,2]...] New group should be created every time value becomes 1.
Marinos An
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How to convert nested list in Mono to Flux?

I am very new to reactive-streams, Can someone help me to convert Mono to Flux I tried something like this - Flux myMethod(Mono homeWork) { return homeWork.map(h -> h.multiplicands) …
user3595026
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Reactive Streams: Spring WebFlux - subscribe to existing publisher

I am currently migrating our existing Spring asynchronous REST architecture to Spring's new WebFlux library and have a question around joining multiple requests so that they can listen for the same published response. Use Case is as follows: Client…
wild_nothing
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Application-level back-pressure VS TCP native flow-control

I am investigating why some systems implement application-level back-pressure given that TCP provides native flow control. I was reading, in particular, akka-streams and (an higher level discussion) reactive streams. Is it only to abstract out the…
affo
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Flux.zip method not emitting all elements

I am working with Reactive Stream and Publishers (Mono and Flux), and combining the two publishers using the zip and zipWith method of Flux as follows: Flux flux1 = Flux.just(" {1} ","{2} ","{3} ","{4} " ); Flux flux2 = Flux.just("…
KayV
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Stream records from DataBase using Akka Stream

I have a system using Akka which currently handles incoming streaming data over message queues. When a record arrives then it is processed, mq is acked and record is passed on for further handling within the system. Now I would like to add support…
Evan M.
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Akka Stream connect to multiple sinks

I have implemented a custom component in akka stream which takes elements as input, groups and merges them based on a key and sends them out through one of a dozen outlets. You can think of this component as a kind of GroupBy component which does…
user510159
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Ways to maintain back pressure in Akka Streams involving multiple JVMs

I'm aware that as of Akka 2.4.16, there is no "remote" implementation of Reactive Streams. The specification focuses on a stream running on a single JVM. However, considering the use case to involve another JVM for some processing while maintaining…
Toaditoad
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Akka-Streams: At-Least-Once-Delivery behaviour with Kafka and Cassandra

I'm starting with Akka Streams and so far everything is going well. However, I have met with a use case that I don't know how to approach. The scenario is a stream with an ActorPublisher as a source that is consuming messages from Kafka and a…
Juan José Vázquez Delgado
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How can I turn blocking code into a responsive style?

I have always been used to blocking programming and working in the Spring MVC framework. Recently, I considered learning reactive programming. I was full of doubts about how to convert the previous logic into a new style. See the following…
Terrence
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