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I was researching the Java Flux API when I noticed from some tutorials that you can only subscribe to one publisher. Yet, I see a use-case where having multiple publishers to a single subscribe is useful: some sort of a data/message bus.

The only solution I found is encapsulating an array of subscribers and 1 publisher inside the bus.

My question is, which is the correct approach from a reactive point of view to this problem?

I'm interested in solving this by implementing my own Publishers/Subscribers etc. (using the Java 9 java.util.concurrent.Flow API) This project is for learning purpouses, not for production.

Brian Clozel
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taigi100
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  • It seems like you want to combine streams. There are plenty of operators allowing you to do this. – a better oliver Sep 08 '18 at 19:57
  • @abetteroliver I want to combine multiple publishers into one. What operators allow you to do this specifically? using the `java.util.concurrent.Flow` interfaces. Thanks! – Ariel Mirra May 30 '21 at 04:20

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You can use Spring Reactor, an implementation of Java Publishers API. It has operators like concat(), merge() etc. to combine the Streams for a given Subscriber. https://projectreactor.io/docs/core/release/api/

Vikram Rawat
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