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54 lines
1.4 KiB
54 lines
1.4 KiB
package nova.monadic_sfx.util.reactive.store
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import monix.bio.Task
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import monix.eval.Coeval
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import monix.reactive.OverflowStrategy
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import monix.reactive.subjects.ConcurrentSubject
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object Store {
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def createL[A, M](
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initialAction: A,
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initialState: M,
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reducer: Reducer[A, M],
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middlewares: Seq[Middleware[A, M]] = Seq.empty,
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overflowStrategy: OverflowStrategy.Synchronous[A] =
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OverflowStrategy.DropOld(50)
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): Task[Store[A, M]] =
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Task.deferAction { implicit s =>
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Task {
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val subject = ConcurrentSubject.publish[A](overflowStrategy)
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val fold: ((A, M), A) => Coeval[(A, M)] = {
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case ((_, state), action) =>
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Coeval {
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val (newState, effects) = reducer(state, action)
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effects.subscribe(subject.onNext _)
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action -> newState
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}
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}
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val obs = subject
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.scanEval0F[Coeval, (A, M)](
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Coeval.pure(initialAction -> initialState)
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)(fold)
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val res = middlewares
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.foldLeft(obs) {
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case (obs, middleware) => middleware(obs)
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}
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.doOnNextF(i => Coeval(println(s"Emitted item 1: $i")))
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.behavior(initialAction -> initialState)
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.refCount
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// .doOnNextF(i => Coeval(println(s"Emitted item 2: $i")))
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MonixProSubject.from(
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subject,
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res
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)
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}
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}
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}
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