What approaches and methods of implementing a hot stream in the flow system do you know?

In Android, using Kotlin Flow, a hot flow is a stream that continues to emit values regardless of whether there are subscribers. Main approaches to implementing a hot flow:

• SharedFlow — a special type of hot flow that allows multiple subscribers to receive the same values. You can configure the buffer and subscription behavior.

• StateFlow — a variant of SharedFlow that holds the current state. Useful for representing UI states.

• Using channels — you can create a channel and convert it into a Flow that will be hot.

• Using shareIn or stateIn operators — allow transforming a cold Flow into a hot one, sharing emissions among subscribers.

Example of a hot flow with SharedFlow:

val sharedFlow = MutableSharedFlow<Int>()

// Emitter
GlobalScope.launch {
    for (i in 1..5) {
        sharedFlow.emit(i)
        delay(1000)
    }
}

// Subscriber
sharedFlow.onEach { value ->
    println("Received $value")
}.launchIn(GlobalScope)

Thus, a hot flow continues to generate data even if there are no subscribers, and new subscribers receive data from the moment they subscribe.