import { map } from './map';
|
import { from } from '../observable/from';
|
import { SimpleOuterSubscriber, SimpleInnerSubscriber, innerSubscribe } from '../innerSubscribe';
|
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 SimpleOuterSubscriber {
|
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);
|
}
|
_innerSub(ish) {
|
const innerSubscriber = new SimpleInnerSubscriber(this);
|
const destination = this.destination;
|
destination.add(innerSubscriber);
|
const innerSubscription = innerSubscribe(ish, innerSubscriber);
|
if (innerSubscription !== innerSubscriber) {
|
destination.add(innerSubscription);
|
}
|
}
|
_complete() {
|
this.hasCompleted = true;
|
if (this.active === 0 && this.buffer.length === 0) {
|
this.destination.complete();
|
}
|
this.unsubscribe();
|
}
|
notifyNext(innerValue) {
|
this.destination.next(innerValue);
|
}
|
notifyComplete() {
|
const buffer = this.buffer;
|
this.active--;
|
if (buffer.length > 0) {
|
this._next(buffer.shift());
|
}
|
else if (this.active === 0 && this.hasCompleted) {
|
this.destination.complete();
|
}
|
}
|
}
|
export const flatMap = mergeMap;
|
//# sourceMappingURL=mergeMap.js.map
|
