| import { subscribeToResult } from '../util/subscribeToResult'; |
| import { OuterSubscriber } from '../OuterSubscriber'; |
| import { InnerSubscriber } from '../InnerSubscriber'; |
| import { map } from './map'; |
| import { from } from '../observable/from'; |
| export function mergeMap(project, resultSelector, concurrent = Number.POSITIVE_INFINITY) { |
| if (typeof resultSelector === 'function') { |
| return (source) => source.pipe(mergeMap((a, i) => from(project(a, i)).pipe(map((b, ii) => resultSelector(a, b, i, ii))), concurrent)); |
| } |
| else if (typeof resultSelector === 'number') { |
| concurrent = resultSelector; |
| } |
| return (source) => source.lift(new MergeMapOperator(project, concurrent)); |
| } |
| export class MergeMapOperator { |
| constructor(project, concurrent = Number.POSITIVE_INFINITY) { |
| this.project = project; |
| this.concurrent = concurrent; |
| } |
| call(observer, source) { |
| return source.subscribe(new MergeMapSubscriber(observer, this.project, this.concurrent)); |
| } |
| } |
| export class MergeMapSubscriber extends OuterSubscriber { |
| constructor(destination, project, concurrent = Number.POSITIVE_INFINITY) { |
| super(destination); |
| this.project = project; |
| this.concurrent = concurrent; |
| this.hasCompleted = false; |
| this.buffer = []; |
| this.active = 0; |
| this.index = 0; |
| } |
| _next(value) { |
| if (this.active < this.concurrent) { |
| this._tryNext(value); |
| } |
| else { |
| this.buffer.push(value); |
| } |
| } |
| _tryNext(value) { |
| let result; |
| const index = this.index++; |
| try { |
| result = this.project(value, index); |
| } |
| catch (err) { |
| this.destination.error(err); |
| return; |
| } |
| this.active++; |
| this._innerSub(result, value, index); |
| } |
| _innerSub(ish, value, index) { |
| const innerSubscriber = new InnerSubscriber(this, undefined, undefined); |
| const destination = this.destination; |
| destination.add(innerSubscriber); |
| subscribeToResult(this, ish, value, index, innerSubscriber); |
| } |
| _complete() { |
| this.hasCompleted = true; |
| if (this.active === 0 && this.buffer.length === 0) { |
| this.destination.complete(); |
| } |
| this.unsubscribe(); |
| } |
| notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) { |
| this.destination.next(innerValue); |
| } |
| notifyComplete(innerSub) { |
| const buffer = this.buffer; |
| this.remove(innerSub); |
| this.active--; |
| if (buffer.length > 0) { |
| this._next(buffer.shift()); |
| } |
| else if (this.active === 0 && this.hasCompleted) { |
| this.destination.complete(); |
| } |
| } |
| } |
| //# sourceMappingURL=mergeMap.js.map |