83 lines
2.8 KiB
JavaScript
83 lines
2.8 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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import { map } from './map';
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import { from } from '../observable/from';
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export function mergeMap(project, resultSelector, concurrent = Number.POSITIVE_INFINITY) {
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if (typeof resultSelector === 'function') {
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return (source) => source.pipe(mergeMap((a, i) => from(project(a, i)).pipe(map((b, ii) => resultSelector(a, b, i, ii))), concurrent));
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}
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else if (typeof resultSelector === 'number') {
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concurrent = resultSelector;
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}
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return (source) => source.lift(new MergeMapOperator(project, concurrent));
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}
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export class MergeMapOperator {
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constructor(project, concurrent = Number.POSITIVE_INFINITY) {
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this.project = project;
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this.concurrent = concurrent;
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}
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call(observer, source) {
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return source.subscribe(new MergeMapSubscriber(observer, this.project, this.concurrent));
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}
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}
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export class MergeMapSubscriber extends OuterSubscriber {
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constructor(destination, project, concurrent = Number.POSITIVE_INFINITY) {
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super(destination);
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this.project = project;
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this.concurrent = concurrent;
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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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this._tryNext(value);
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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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_tryNext(value) {
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let result;
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const index = this.index++;
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try {
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result = this.project(value, index);
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}
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catch (err) {
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this.destination.error(err);
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return;
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}
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this.active++;
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this._innerSub(result, value, index);
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}
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_innerSub(ish, value, index) {
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const innerSubscriber = new InnerSubscriber(this, undefined, undefined);
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const destination = this.destination;
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destination.add(innerSubscriber);
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subscribeToResult(this, ish, value, index, innerSubscriber);
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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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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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this.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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this.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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this.destination.complete();
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}
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}
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}
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//# sourceMappingURL=mergeMap.js.map
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