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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| /* | ||
| * Licensed to Elasticsearch B.V. under one or more contributor | ||
| * license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright | ||
| * ownership. Elasticsearch B.V. licenses this file to you under | ||
| * the Apache License, Version 2.0 (the "License"); you may | ||
| * not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, | ||
| * software distributed under the License is distributed on an | ||
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| * KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations | ||
| * under the License. | ||
| */ | ||
|
|
||
| import { Poller } from './poller'; | ||
|
|
||
| const delay = (duration: number) => new Promise(r => setTimeout(r, duration)); | ||
|
|
||
| describe('Poller', () => { | ||
| let handler: jest.Mock<any, any>; | ||
| let poller: Poller<string>; | ||
|
|
||
| beforeEach(() => { | ||
| handler = jest.fn().mockImplementation((iteration: number) => `polling-${iteration}`); | ||
| poller = new Poller<string>(100, 'polling', handler); | ||
| }); | ||
|
|
||
| afterEach(() => { | ||
| poller.unsubscribe(); | ||
| }); | ||
|
|
||
| it('returns an observable of subject', async () => { | ||
| await delay(300); | ||
| expect(poller.subject$.getValue()).toBe('polling-2'); | ||
| }); | ||
|
|
||
| it('executes a function on an interval', async () => { | ||
| await delay(300); | ||
| expect(handler).toBeCalledTimes(3); | ||
| }); | ||
|
|
||
| it('no longer polls after unsubscribing', async () => { | ||
| await delay(300); | ||
| poller.unsubscribe(); | ||
| await delay(300); | ||
| expect(handler).toBeCalledTimes(3); | ||
| }); | ||
|
|
||
| it('does not add next value if returns undefined', async () => { | ||
| const values: any[] = []; | ||
| const polling = new Poller<string>(100, 'polling', iteration => { | ||
| if (iteration % 2 === 0) { | ||
| return `polling-${iteration}`; | ||
| } | ||
| }); | ||
|
|
||
| polling.subject$.subscribe(value => { | ||
| values.push(value); | ||
| }); | ||
| await delay(300); | ||
| polling.unsubscribe(); | ||
|
|
||
| expect(values).toEqual(['polling', 'polling-0', 'polling-2']); | ||
| }); | ||
| }); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| /* | ||
| * Licensed to Elasticsearch B.V. under one or more contributor | ||
| * license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright | ||
| * ownership. Elasticsearch B.V. licenses this file to you under | ||
| * the Apache License, Version 2.0 (the "License"); you may | ||
| * not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, | ||
| * software distributed under the License is distributed on an | ||
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| * KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations | ||
| * under the License. | ||
| */ | ||
|
|
||
| import { BehaviorSubject, timer } from 'rxjs'; | ||
|
|
||
| /** | ||
| * Create an Observable BehaviorSubject to invoke a function on an interval | ||
| * which returns the next value for the observable. | ||
| * @public | ||
| */ | ||
| export class Poller<T> { | ||
| /** | ||
| * The observable to observe for changes to the poller value. | ||
| */ | ||
| public readonly subject$ = new BehaviorSubject<T>(this.initialValue); | ||
| private poller$ = timer(0, this.frequency); | ||
| private subscription = this.poller$.subscribe(async iteration => { | ||
| const next = await this.handler(iteration); | ||
|
|
||
| if (next !== undefined) { | ||
| this.subject$.next(next); | ||
| } | ||
|
|
||
| return iteration; | ||
| }); | ||
|
|
||
| constructor( | ||
| private frequency: number, | ||
| private initialValue: T, | ||
| private handler: (iteration: number) => Promise<T | undefined> | T | undefined | ||
| ) {} | ||
|
|
||
| /** | ||
| * Permanently end the polling operation. | ||
| */ | ||
| unsubscribe() { | ||
| return this.subscription.unsubscribe(); | ||
| } | ||
| } |
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