Question 1

What is the fundamental principle of reactive programming?

Accepted Answer

Reactive programming is based on asynchronous data streams and automatic change propagation. Unlike imperative programming where data is actively requested (pull), reactive pushes data to subscribers (push). This enables building non-blocking applications that are resilient to load changes.

Question 2

What is the main difference between Mono and Flux in Project Reactor?

Accepted Answer

Mono is a reactive publisher that emits 0 or 1 element, ideal for operations returning a single value (like findById). Flux emits 0 to N elements, suitable for collections and streams (like findAll). This distinction optimizes performance and code semantics by clearly expressing cardinality expectations.

Question 3

When should Mono be used instead of Flux?

Accepted Answer

Use Mono when the operation returns 0 or 1 result maximum, such as fetching a user by ID, saving an entity, or making an HTTP request that returns a single object. This communicates code intent and enables internal optimizations. Flux would be inappropriate as it implies a potentially large collection.

Spring WebFlux (Reactive)

What is the fundamental principle of reactive programming?

Câu trả lời

What is the main difference between Mono and Flux in Project Reactor?

Câu trả lời

When should Mono<T> be used instead of Flux<T>?

Câu trả lời

What is the typical use case for Flux<T>?

What is the fundamental difference between Spring WebFlux and Spring MVC?

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