Hands-On Reactive Programming with Reactor

Push-pull model

Reactor is a push-pull system. A fast producer raises events and waits for the slower subscriber to pull them. In the case of a slow publisher and a fast subscriber, the subscriber waits for events to be pushed from the producer. The Reactive Streams API allows this data flow to be dynamic in nature. It only depends on the real-time rate of production and the rate of consumption.