Why it matters

Reactive shapes streaming design. Understanding shapes modern Java async.

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The architecture

Publisher (Flux / Mono).

Operators: map, flatMap, concatMap.

Backpressure signals.

Reactive agent stackFlux / Monoreactive typesOperatorsmap / flatMap / etc.Backpressuresignal upstreamReactor + WebFlux + Reactive HTTP client (WebClient) form complete stack
Reactive.
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How it works end to end

Reactor Core.

WebFlux for HTTP.

Schedulers for concurrency.

onBackpressureBuffer / drop.