The most efficient way to split a Flux to multiple Fluxes in Reactor 3

Question

In Reactor 3, what\'s the most efficient way to split a heterogeneous flux to multiple fluxes by pattern matching? (And subsequent operations on each flux may be very differ

Answer 1

If the number of groups is fairly low, then you can use Flux.groupBy referenced in the project reactor docs

For example:

Flux<String> flux = Flux.just("a1", "b1", "c1", "a2", "b2", "c2")
        .groupBy(s -> s.charAt(0))
        .concatMap(groupedFlux -> groupedFlux
                .startWith("Group " + groupedFlux.key()));

StepVerifier.create(flux)
        .expectNext("Group a", "a1", "a2")
        .expectNext("Group b", "b1", "b2")
        .expectNext("Group c", "c1", "c2")
        .verifyComplete();

You can use groupedFlux.key() to vary the operations performed for each group.