Reactive Streams Specification

The initiative and specification page for the Reactive Streams standard for asynchronous stream processing with non-blocking backpressure.

Key Takeaways

• Goal: “provide a standard for asynchronous stream processing with non-blocking back pressure” across JVM and JavaScript environments.
• Four minimal interfaces: Publisher, Subscriber, Subscription, Processor.
• Back pressure ensures “the receiving side is not forced to buffer arbitrary amounts of data.”
• Adopted into JDK 9+ as java.util.concurrent.Flow — semantically equivalent 1:1.
• Designed to allow interoperability: different conforming implementations can be composed in a single pipeline.
• The specification is minimal by design — libraries (Reactor, RxJava) build rich operator APIs on top.
• TCK (Technology Compatibility Kit) provided for conformance testing.

Referenced Concepts

• Reactive Streams
• Backpressure
• Reactive Programming
• Reactive Architecture

Confidence

High — read directly from source.