flux2 | extensible continuous delivery solution for Kubernetes | Continuous Deployment library

I have two IObservable, and want to create a IObservable (or some sort of ISingle, if such a thing exists) that emits a completion signal when both complete, and nothing else. What's the idiomatic way to do this in Rx.NET?

I'm used to Reactor Core, in which case I'd use flux1.then().and(flux2.then()). But I don't believe Rx.NET offers the then and and operators.

I have a data service and I am seriously considering switching to a reactive model. This is a federated query engine that can resolve data for queries by invoking one or more "resolver" implementations, depending on the query type.

If I switch to spring-data-mongodb-reactive, then each of these implementations would have to create a number of Flux instances for:

1. the queries for different parts of the information
2. querying all databases for each query from #1

Note: I don't want to combine every Flux because being able to keep the queries for #1 above separate make the final processing much easier. Combining each "part" query for all federated databases would be fine, but I have to keep the data for each "part" separate. I hope that makes sense.

Explaining the full workflow is out of the scope of this post, but I am wondering how I can create any number of Flux instances, and subscribe to them to get them started, but then wait until they all complete before proceeding with the processing of the fully-retrieved data across all federated sources. In Java, I am looking for something that is analogous to a CompletableFuture.allOf().

Am I even close to being on the right track if I do something like this:

I am learning Spring WebFlux.

My Entity goes like this:

Given 2 Flux-

My data is stored in Cosmos and it is Hierarchical and stored in different tables.

I have two flux which contains fruit names like below. I want out put with fruit name and it's count.

for eg: