batchloader/lib/cacheproxyloader.js

BatchLoader is a utility for data fetching layer to reduce requests via batching written in TypeScript. Inspired by Facebook's DataLoader

import { BatchLoader } from './batchloader';
export const proxyLoaderWithCache = (cache, loader, keyToUniqueId, batchDelay, batchSize) => new BatchLoader(async (keys) => {
    const values = await cache.mget(keys);
    const len = values.length;
    const missingKeys = [];
    const missingIndexes = [];
    for (let i = 0; i < len; i += 1) {
        if (values[i] === undefined) {
            missingKeys.push(keys[i]);
            missingIndexes.push(i);
        }
    }
    if (missingKeys.length) {
        const missingValues = await loader.loadMany(missingKeys);
        const mlen = missingValues.length;
        const missingKeyValues = [];
        for (let i = 0; i < mlen; i += 1) {
            const value = missingValues[i];
            values[missingIndexes[i]] = value;
            missingKeyValues.push([missingKeys[i], value]);
        }
        cache.mset(missingKeyValues);
    }
    return values;
}, keyToUniqueId, batchDelay, batchSize);
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