89 lines
3.0 KiB
JavaScript
89 lines
3.0 KiB
JavaScript
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import { subscribeToResult } from '../util/subscribeToResult';
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import { OuterSubscriber } from '../OuterSubscriber';
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import { InnerSubscriber } from '../InnerSubscriber';
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export function mergeScan(accumulator, seed, concurrent = Number.POSITIVE_INFINITY) {
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return (source) => source.lift(new MergeScanOperator(accumulator, seed, concurrent));
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}
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export class MergeScanOperator {
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constructor(accumulator, seed, concurrent) {
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this.accumulator = accumulator;
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this.seed = seed;
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this.concurrent = concurrent;
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}
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call(subscriber, source) {
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return source.subscribe(new MergeScanSubscriber(subscriber, this.accumulator, this.seed, this.concurrent));
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}
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}
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export class MergeScanSubscriber extends OuterSubscriber {
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constructor(destination, accumulator, acc, concurrent) {
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super(destination);
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this.accumulator = accumulator;
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this.acc = acc;
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this.concurrent = concurrent;
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this.hasValue = false;
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this.hasCompleted = false;
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this.buffer = [];
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this.active = 0;
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this.index = 0;
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}
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_next(value) {
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if (this.active < this.concurrent) {
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const index = this.index++;
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const destination = this.destination;
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let ish;
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try {
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const { accumulator } = this;
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ish = accumulator(this.acc, value, index);
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}
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catch (e) {
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return destination.error(e);
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}
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this.active++;
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this._innerSub(ish, value, index);
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}
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else {
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this.buffer.push(value);
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}
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}
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_innerSub(ish, value, index) {
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const innerSubscriber = new InnerSubscriber(this, value, index);
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const destination = this.destination;
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destination.add(innerSubscriber);
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const innerSubscription = subscribeToResult(this, ish, undefined, undefined, innerSubscriber);
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if (innerSubscription !== innerSubscriber) {
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destination.add(innerSubscription);
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}
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}
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_complete() {
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this.hasCompleted = true;
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if (this.active === 0 && this.buffer.length === 0) {
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if (this.hasValue === false) {
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this.destination.next(this.acc);
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}
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this.destination.complete();
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}
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this.unsubscribe();
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}
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notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
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const { destination } = this;
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this.acc = innerValue;
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this.hasValue = true;
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destination.next(innerValue);
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}
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notifyComplete(innerSub) {
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const buffer = this.buffer;
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const destination = this.destination;
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destination.remove(innerSub);
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this.active--;
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if (buffer.length > 0) {
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this._next(buffer.shift());
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}
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else if (this.active === 0 && this.hasCompleted) {
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if (this.hasValue === false) {
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this.destination.next(this.acc);
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}
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this.destination.complete();
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}
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}
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}
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//# sourceMappingURL=mergeScan.js.map
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