@botonic/plugin-contentful/lib/esm/util/memoizer.js

Botonic Plugin Contentful is one of the **[available](https://github.com/hubtype/botonic/tree/master/packages)** plugins for Botonic. **[Contentful](http://www.contentful.com)** is a CMS (Content Management System) which manages contents of a great variet

import { __awaiter } from "tslib";
import { InMemoryCache, NOT_FOUND_IN_CACHE } from './cache';
export const jsonNormalizer = (...args) => {
    return JSON.stringify(args);
};
export class Memoizer {
    constructor(opts) {
        this.opts = {
            strategy: opts.strategy,
            normalizer: opts.normalizer || jsonNormalizer,
            cacheFactory: opts.cacheFactory || (() => new InMemoryCache()),
        };
    }
    memoize(func) {
        const cache = this.opts.cacheFactory();
        const f = (...args) => this.opts.strategy(cache, this.opts.normalizer, func, ...args);
        return f;
    }
}
/***
 * Only re-invoke if not in cache
 */
export const cacheForeverStrategy = (cache, normalizer = jsonNormalizer, func, ...args) => __awaiter(void 0, void 0, void 0, function* () {
    const id = normalizer(...args);
    let val = cache.get(id);
    if (val === NOT_FOUND_IN_CACHE) {
        val = yield func(...args);
        cache.set(id, val);
    }
    return val;
});
/**
 * Always invokes the function, but fallbacks to last invocation result if available
 */
export function fallbackStrategy(usingFallback) {
    return (cache, normalizer = jsonNormalizer, func, ...args) => __awaiter(this, void 0, void 0, function* () {
        const id = normalizer(...args);
        const oldVal = cache.get(id);
        try {
            const newVal = yield func(...args);
            cache.set(id, newVal);
            return newVal;
        }
        catch (e) {
            if (oldVal !== NOT_FOUND_IN_CACHE) {
                yield usingFallback(String(func.name), args, e);
                return oldVal;
            }
            throw e;
        }
    });
}
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