package engine
import monix.execution.Cancelable
import monix.reactive.Observable
import monix.reactive.observers.Subscriber
import shared.models.Signal
import util.Random
import scala.concurrent.duration._
final class DataProducer(interval: FiniteDuration, seed: Long)
extends Observable[Signal] {
override def unsafeSubscribeFn(subscriber: Subscriber[Signal]): Cancelable = {
import subscriber.{scheduler => s}
val random = Observable
.fromStateAction(Random.intInRange(-20, 20))(s.currentTimeMillis() + seed)
.flatMap { x => Observable.now(x).delaySubscription(interval) }
val generator = random.scan(Signal(0, s.currentTimeMillis())) {
case (Signal(value, _), rnd) =>
Signal(value + rnd, s.currentTimeMillis())
}
generator
.drop(1)
.unsafeSubscribeFn(subscriber)
}
}
