Hands-On Reactive Programming in Spring 5

Transforming reactive sequences into blocking structures

The Project Reactor library provides an API for transforming reactive sequences into blocking structures. Even though any blocking operations should be omitted in a reactive application, sometimes it is required by the upper-level API. So, we have the following options for blocking the stream and producing a result synchronously:

• The toIterable method transforms reactive Flux into a blocking Iterable.
• The toStream method transforms reactive Flux into a blocking Stream API. As of Reactor 3.2, it uses the toIterable method under the hood.
• The blockFirst method blocks the current thread until the upstream signals its first value or completes.
• The blockLast method blocks the current thread ...