Hands-On Spring Security 5 for Reactive Applications

Data stream types

Broadly, data streams can be categorized into two types:

• Cold data streams: There are a number of names by which this is known, such as Cold Source, Cold Observable, and Cold Publisher. These emit data only when one subscribes to it and because of this, all messages produced from start are delivered to the subscriber. If a new Subscriber connects to it, the messages are replayed in ascending order and this is same for any new Subscriber. The Subscriber also has a provision to dictate the rate at which the Publisher should emit messages. These data streams are good candidates for applying reactive backpressure (request(n)), for example, a database cursor or file stream (reading a file).
• Hot data streams: Again, this has ...