77 lines
2.3 KiB
TypeScript
77 lines
2.3 KiB
TypeScript
import { Injectable } from '@angular/core';
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import { OpenSlidesComponent } from 'app/openslides.component';
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import { Observable, BehaviorSubject } from 'rxjs';
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import { Config } from '../../shared/models/core/config';
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import { DataStoreService } from '../core-services/data-store.service';
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/**
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* Handler for config variables.
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*
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* @example
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* ```ts
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* this.configService.get('general_event_name').subscribe(value => {
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* console.log(value);
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* });
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* ```
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*
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* @example
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* ```ts
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* const value = this.configService.instant('general_event_name');
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* ```
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*/
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@Injectable({
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providedIn: 'root'
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})
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export class ConfigService extends OpenSlidesComponent {
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/**
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* Stores a subject per key. Values are published, if the DataStore gets an update.
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*/
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private configSubjects: { [key: string]: BehaviorSubject<any> } = {};
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/**
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* Listen for changes of config variables.
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*/
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public constructor(private DS: DataStoreService) {
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super();
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this.DS.changeObservable.subscribe(data => {
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// on changes notify the observers for specific keys.
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if (data instanceof Config && this.configSubjects[data.key]) {
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this.configSubjects[data.key].next(data.value);
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}
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});
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}
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/**
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* Get the constant named by key from the DataStore. If the DataStore isn't up to date or
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* not filled via autoupdates the results may be wrong/empty. Use this with caution.
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*
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* Usefull for synchronos code, e.g. during generation of PDFs, when the DataStore is filled.
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*
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* @param key The config value to get from.
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*/
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public instant<T>(key: string): T {
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const values = this.DS.filter<Config>('core/config', value => value.key === key);
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if (values.length > 1) {
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throw new Error('More keys found then expected');
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} else if (values.length === 1) {
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return values[0].value as T;
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} else {
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return;
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}
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}
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/**
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* Get an observer for the config value given by the key.
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*
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* @param key The config value to get from.
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*/
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public get<T>(key: string): Observable<T> {
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if (!this.configSubjects[key]) {
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this.configSubjects[key] = new BehaviorSubject<any>(this.instant(key));
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}
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return this.configSubjects[key].asObservable() as Observable<T>;
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}
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}
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