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3da38d6e C |
1 | import { uniq } from 'lodash-es' |
2 | import { asyncScheduler, Observable } from 'rxjs' | |
3 | import { bufferTime, distinctUntilChanged, filter, map, observeOn, share, switchMap } from 'rxjs/operators' | |
4 | import { NgZone } from '@angular/core' | |
5 | import { enterZone, leaveZone } from './zone' | |
6 | ||
7 | function buildBulkObservable <T extends number | string, R> (options: { | |
8 | ngZone: NgZone | |
9 | notifierObservable: Observable<T> | |
10 | time: number | |
11 | bulkGet: (params: T[]) => Observable<R> | |
12 | }) { | |
13 | const { ngZone, notifierObservable, time, bulkGet } = options | |
14 | ||
15 | return notifierObservable.pipe( | |
16 | distinctUntilChanged(), | |
17 | // We leave Angular zone so Protractor does not get stuck | |
18 | bufferTime(time, leaveZone(ngZone, asyncScheduler)), | |
19 | filter(params => params.length !== 0), | |
20 | map(params => uniq(params)), | |
21 | observeOn(enterZone(ngZone, asyncScheduler)), | |
22 | switchMap(params => bulkGet(params)), | |
23 | share() | |
24 | ) | |
25 | } | |
26 | ||
27 | export { | |
28 | buildBulkObservable | |
29 | } |