ForkJoinObservable.ts
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import { Observable, SubscribableOrPromise } from '../Observable';
import { Subscriber } from '../Subscriber';
import { Subscription } from '../Subscription';
import { EmptyObservable } from './EmptyObservable';
import { isArray } from '../util/isArray';
import { subscribeToResult } from '../util/subscribeToResult';
import { OuterSubscriber } from '../OuterSubscriber';
import { InnerSubscriber } from '../InnerSubscriber';
/**
* We need this JSDoc comment for affecting ESDoc.
* @extends {Ignored}
* @hide true
*/
export class ForkJoinObservable<T> extends Observable<T> {
constructor(private sources: Array<SubscribableOrPromise<any>>,
private resultSelector?: (...values: Array<any>) => T) {
super();
}
/* tslint:disable:max-line-length */
static create<T, T2>(v1: SubscribableOrPromise<T>, v2: SubscribableOrPromise<T2>): Observable<[T, T2]>;
static create<T, T2, T3>(v1: SubscribableOrPromise<T>, v2: SubscribableOrPromise<T2>, v3: SubscribableOrPromise<T3>): Observable<[T, T2, T3]>;
static create<T, T2, T3, T4>(v1: SubscribableOrPromise<T>, v2: SubscribableOrPromise<T2>, v3: SubscribableOrPromise<T3>, v4: SubscribableOrPromise<T4>): Observable<[T, T2, T3, T4]>;
static create<T, T2, T3, T4, T5>(v1: SubscribableOrPromise<T>, v2: SubscribableOrPromise<T2>, v3: SubscribableOrPromise<T3>, v4: SubscribableOrPromise<T4>, v5: SubscribableOrPromise<T5>): Observable<[T, T2, T3, T4, T5]>;
static create<T, T2, T3, T4, T5, T6>(v1: SubscribableOrPromise<T>, v2: SubscribableOrPromise<T2>, v3: SubscribableOrPromise<T3>, v4: SubscribableOrPromise<T4>, v5: SubscribableOrPromise<T5>, v6: SubscribableOrPromise<T6>): Observable<[T, T2, T3, T4, T5, T6]>;
static create<T, T2, R>(v1: SubscribableOrPromise<T>, v2: SubscribableOrPromise<T2>, project: (v1: T, v2: T2) => R): Observable<R>;
static create<T, T2, T3, R>(v1: SubscribableOrPromise<T>, v2: SubscribableOrPromise<T2>, v3: SubscribableOrPromise<T3>, project: (v1: T, v2: T2, v3: T3) => R): Observable<R>;
static create<T, T2, T3, T4, R>(v1: SubscribableOrPromise<T>, v2: SubscribableOrPromise<T2>, v3: SubscribableOrPromise<T3>, v4: SubscribableOrPromise<T4>, project: (v1: T, v2: T2, v3: T3, v4: T4) => R): Observable<R>;
static create<T, T2, T3, T4, T5, R>(v1: SubscribableOrPromise<T>, v2: SubscribableOrPromise<T2>, v3: SubscribableOrPromise<T3>, v4: SubscribableOrPromise<T4>, v5: SubscribableOrPromise<T5>, project: (v1: T, v2: T2, v3: T3, v4: T4, v5: T5) => R): Observable<R>;
static create<T, T2, T3, T4, T5, T6, R>(v1: SubscribableOrPromise<T>, v2: SubscribableOrPromise<T2>, v3: SubscribableOrPromise<T3>, v4: SubscribableOrPromise<T4>, v5: SubscribableOrPromise<T5>, v6: SubscribableOrPromise<T6>, project: (v1: T, v2: T2, v3: T3, v4: T4, v5: T5, v6: T6) => R): Observable<R>;
static create<T>(sources: SubscribableOrPromise<T>[]): Observable<T[]>;
static create<R>(sources: SubscribableOrPromise<any>[]): Observable<R>;
static create<T, R>(sources: SubscribableOrPromise<T>[], project: (...values: Array<T>) => R): Observable<R>;
static create<R>(sources: SubscribableOrPromise<any>[], project: (...values: Array<any>) => R): Observable<R>;
static create<T>(...sources: SubscribableOrPromise<T>[]): Observable<T[]>;
static create<R>(...sources: SubscribableOrPromise<any>[]): Observable<R>;
/* tslint:enable:max-line-length */
/**
* @param sources
* @return {any}
* @static true
* @name forkJoin
* @owner Observable
*/
static create<T>(...sources: Array<SubscribableOrPromise<any> |
Array<SubscribableOrPromise<any>> |
((...values: Array<any>) => any)>): Observable<T> {
if (sources === null || arguments.length === 0) {
return new EmptyObservable<T>();
}
let resultSelector: (...values: Array<any>) => any = null;
if (typeof sources[sources.length - 1] === 'function') {
resultSelector = <(...values: Array<any>) => any>sources.pop();
}
// if the first and only other argument besides the resultSelector is an array
// assume it's been called with `forkJoin([obs1, obs2, obs3], resultSelector)`
if (sources.length === 1 && isArray(sources[0])) {
sources = <Array<SubscribableOrPromise<any>>>sources[0];
}
if (sources.length === 0) {
return new EmptyObservable<T>();
}
return new ForkJoinObservable(<Array<SubscribableOrPromise<any>>>sources, resultSelector);
}
protected _subscribe(subscriber: Subscriber<any>): Subscription {
return new ForkJoinSubscriber(subscriber, this.sources, this.resultSelector);
}
}
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
class ForkJoinSubscriber<T> extends OuterSubscriber<T, T> {
private completed = 0;
private total: number;
private values: any[];
private haveValues = 0;
constructor(destination: Subscriber<T>,
private sources: Array<SubscribableOrPromise<any>>,
private resultSelector?: (...values: Array<any>) => T) {
super(destination);
const len = sources.length;
this.total = len;
this.values = new Array(len);
for (let i = 0; i < len; i++) {
const source = sources[i];
const innerSubscription = subscribeToResult(this, source, null, i);
if (innerSubscription) {
(<any> innerSubscription).outerIndex = i;
this.add(innerSubscription);
}
}
}
notifyNext(outerValue: any, innerValue: T,
outerIndex: number, innerIndex: number,
innerSub: InnerSubscriber<T, T>): void {
this.values[outerIndex] = innerValue;
if (!(<any>innerSub)._hasValue) {
(<any>innerSub)._hasValue = true;
this.haveValues++;
}
}
notifyComplete(innerSub: InnerSubscriber<T, T>): void {
const destination = this.destination;
const { haveValues, resultSelector, values } = this;
const len = values.length;
if (!(<any>innerSub)._hasValue) {
destination.complete();
return;
}
this.completed++;
if (this.completed !== len) {
return;
}
if (haveValues === len) {
const value = resultSelector ? resultSelector.apply(this, values) : values;
destination.next(value);
}
destination.complete();
}
}