How to calculate the average of a Project Reactor Flux?

Question

I have a method that returns a Flux, let\'s suppose SensorData has a field measure: Integer.

I would like to calculate the av

Answer 1

Another way of doing it with an auxiliary object:

val average = sensorFlux.map { it.measure }
                .map { Measure(1, it) }
                .reduce { t: Measure, u: Measure -> Measure(t.elements + u.elements, t.sum + u.sum) }
                .map { it.sum / it.elements }

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data class Measure(var elements: Int, var sum: Long)

Answer 2

Mono<Double> average = sensorFlux.collect(Collectors.averagingInt(SensorData::getMeasure))