55 lines
2.5 KiB
JavaScript
55 lines
2.5 KiB
JavaScript
import * as Deferred from "../../Deferred.js";
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import * as Effect from "../../Effect.js";
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import { dual, pipe } from "../../Function.js";
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import * as Option from "../../Option.js";
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import * as Ref from "../../Ref.js";
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/** @internal */
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export const HandoffTypeId = /*#__PURE__*/Symbol.for("effect/Stream/Handoff");
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/** @internal */
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export const OP_HANDOFF_STATE_EMPTY = "Empty";
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/** @internal */
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export const OP_HANDOFF_STATE_FULL = "Full";
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/** @internal */
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const handoffStateEmpty = notifyConsumer => ({
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_tag: OP_HANDOFF_STATE_EMPTY,
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notifyConsumer
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});
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/** @internal */
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const handoffStateFull = (value, notifyProducer) => ({
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_tag: OP_HANDOFF_STATE_FULL,
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value,
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notifyProducer
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});
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/** @internal */
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const handoffStateMatch = (onEmpty, onFull) => {
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return self => {
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switch (self._tag) {
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case OP_HANDOFF_STATE_EMPTY:
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{
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return onEmpty(self.notifyConsumer);
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}
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case OP_HANDOFF_STATE_FULL:
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{
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return onFull(self.value, self.notifyProducer);
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}
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}
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};
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};
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const handoffVariance = {
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/* c8 ignore next */
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_A: _ => _
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};
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/** @internal */
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export const make = () => pipe(Deferred.make(), Effect.flatMap(deferred => Ref.make(handoffStateEmpty(deferred))), Effect.map(ref => ({
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[HandoffTypeId]: handoffVariance,
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ref
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})));
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/** @internal */
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export const offer = /*#__PURE__*/dual(2, (self, value) => {
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return Effect.flatMap(Deferred.make(), deferred => Effect.flatten(Ref.modify(self.ref, state => pipe(state, handoffStateMatch(notifyConsumer => [Effect.zipRight(Deferred.succeed(notifyConsumer, void 0), Deferred.await(deferred)), handoffStateFull(value, deferred)], (_, notifyProducer) => [Effect.flatMap(Deferred.await(notifyProducer), () => pipe(self, offer(value))), state])))));
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});
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/** @internal */
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export const take = self => Effect.flatMap(Deferred.make(), deferred => Effect.flatten(Ref.modify(self.ref, state => pipe(state, handoffStateMatch(notifyConsumer => [Effect.flatMap(Deferred.await(notifyConsumer), () => take(self)), state], (value, notifyProducer) => [Effect.as(Deferred.succeed(notifyProducer, void 0), value), handoffStateEmpty(deferred)])))));
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/** @internal */
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export const poll = self => Effect.flatMap(Deferred.make(), deferred => Effect.flatten(Ref.modify(self.ref, state => pipe(state, handoffStateMatch(() => [Effect.succeed(Option.none()), state], (value, notifyProducer) => [Effect.as(Deferred.succeed(notifyProducer, void 0), Option.some(value)), handoffStateEmpty(deferred)])))));
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//# sourceMappingURL=handoff.js.map
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