lrucache-dataloader

Node.js Data Loader with LRU cache and configurable TTL per item

Example

import {TTLItemLRUCacheDataLoader} from "lrucache-dataloader";

const loader = async (keys) => {
    console.log("GET", keys);
    await sleep(1000);
    return keys.map(key => {
        return {
            key: key,
            value: new Date(),
            ttl: 3000
        }
    });
}

const userLoader = new TTLItemLRUCacheDataLoader(loader, {
    lruCacheMax: 100,
    lruCacheTTL: 5000, // default TTL
    lruCacheTTLFromItem: (item) => {
        return item.ttl;
    },
    lruCacheValueFromItem: (item) => {
        return item.value;
    }
});

(async () => {
    console.log("PRE", await userLoader.load('1000'));
    await sleep(1000);
    console.log("POST", await userLoader.load('1000'));
})();