@botonic/plugin-contentful/lib/esm/contentful/delivery/fallback-cache.js

## What Does This Plugin Do?

import { InMemoryCache, LimitedCacheDecorator } from '../../util/cache';
import { fallbackStrategy, Memoizer } from '../../util/memoizer';
/**
 * Use memoization to remember forever the last successful result, and use it
 * whenever Contentful fails.
 */
export class FallbackCachedClientApi {
    constructor(client, cacheLimitKB, reporter, logger = console.error) {
        this.numRecoveredErrors = 0;
        this.numMemoizations = 0;
        // TODO share the same cache for all APIs to avoid reaching a Memoizer limit
        // while others have empty space
        const memoizerCache = () => new LimitedCacheDecorator(new InMemoryCache(), cacheLimitKB / FallbackCachedClientApi.NUM_APIS, logger);
        // We could maybe use a more optimal normalizer than jsonNormalizer
        // (like they do in fast-json-stringify to avoid JSON.stringify for functions with a single nulls, numbers and booleans).
        // But it's not worth since stringify will have a cost much lower than constructing/rendering a botonic component
        // (and we're already optimizing the costly call to CMS)
        this.memoizer = new Memoizer({
            cacheFactory: memoizerCache,
            strategy: fallbackStrategy((f, args, e) => reporter(`Successfully used cached fallback after Contentful API error`, f, args, e)),
        });
        this.getAsset = this.memoize(client.getAsset.bind(client));
        this.getAssets = this.memoize(client.getAssets.bind(client));
        this.getEntries = this.memoize(client.getEntries.bind(client));
        this.getEntry = this.memoize(client.getEntry.bind(client));
        this.getContentType = this.memoize(client.getContentType.bind(client));
        if (this.numMemoizations != FallbackCachedClientApi.NUM_APIS) {
            throw new Error('FallbackCachedClientApi.NUM_APIS must equal the number of memoized APIs');
        }
    }
    memoize(func) {
        this.numMemoizations++;
        return this.memoizer.memoize(func);
    }
}
FallbackCachedClientApi.NUM_APIS = 5;
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