Creating Hot Streams with ConnectableFlux in Reactor and Controlling Threads with publishOn

The original text addresses efficiency issues when performing multiple operations (such as distinct, count, etc.) on a single stream, using a fruit basket example. Initially, subscribeOn(Schedulers.parallel()) was applied to each operation, but this caused redundant iteration of the source stream and could lead to daemon thread termination issues. To resolve this, the result of Flux.fromIterable is converted into a ConnectableFlux (Hot) via publish().autoConnect(2), ensuring the source stream is iterated only once. Subsequently, for each branched operation stream, publishOn is used instead of subscribeOn to switch threads only for the operators following the point of application, thereby controlling the thread context to enable parallel processing while maintaining the source subscription.