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docs(service-worker): fix example of manually checking for updates (#28020)

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Poll for updates in a way that does not prevent the SW from being
registered. Discussed in https://github.com/angular/angular/pull/27332#pullrequestreview-179504620.

PR Close #28020
This commit is contained in:
George Kalpakas
2019-01-09 18:44:47 +02:00
committed by Andrew Kushnir
parent 89a39bb22a
commit 8c3f98fdbb
2 changed files with 23 additions and 9 deletions
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18
aio/content/examples/service-worker-getting-started/src/app/check-for-update.service.ts
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@ -1,15 +1,17 @@
import { Injectable } from '@angular/core';
import { ApplicationRef, Injectable } from '@angular/core';
import { SwUpdate } from '@angular/service-worker';
// #docregion sw-check-update
import { interval } from 'rxjs';
import { concat, interval } from 'rxjs';
import { first } from 'rxjs/operators';
@Injectable()
export class CheckForUpdateService {
constructor(updates: SwUpdate) {
interval(6 * 60 * 60).subscribe(() => updates.checkForUpdate());
constructor(appRef: ApplicationRef, updates: SwUpdate) {
// Allow the app to stabilize first, before starting polling for updates with `interval()`.
const appIsStable$ = appRef.isStable.pipe(first(isStable => isStable === true));
const everySixHours$ = interval(6 * 60 * 60 * 1000);
const everySixHoursOnceAppIsStable$ = concat(appIsStable$, everySixHours$);
everySixHoursOnceAppIsStable$.subscribe(() => updates.checkForUpdate());
}
}
// #enddocregion sw-check-update