@microsoft/windows-admin-center-sdk/core/base/data-store/cached-data-store.js

Microsoft - Windows Admin Center Shell

import { of } from 'rxjs';
import { tap } from 'rxjs/operators';
import { DataStore } from './data-store';
/**
 * Defines a base class extended from DataStore but with additional caching cabailities
 */
export class CachedDataStore extends DataStore {
    /**
     * Backing subject for dataCleared property
     */
    get cachedValue() {
        return this.internalCachedValue;
    }
    internalCachedValue;
    cached = false;
    /**
     * Initializes a new instance of CachedDataStore<TData, TStoredData>
     */
    constructor() {
        super();
        this.rxjsLifetime.addSubscriptions(this.dataChanged.subscribe(data => this.internalCachedValue = data), this.dataCleared.subscribe(() => this.clearCache()));
    }
    /**
     * Gets the data value from the data store
     */
    get() {
        if (this.cached) {
            return of(this.cachedValue);
        }
        return super.get().pipe(tap(data => {
            this.internalCachedValue = data;
            this.cached = true;
        }));
    }
    /**
     * Clears the cache from this data store
     */
    clearCache() {
        this.cached = false;
        this.internalCachedValue = null;
    }
}

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