How can I implement a read-through cache in my application?

How can I implement a read-through cache in my application?

To implement a read-through cache, you can use a caching library that supports this pattern. Do you have a specific technology in mind?

I'm using Node.js with Redis for caching.

Great choice! You can use the node-redis library to interact with Redis. First, check if the data is in the cache, and if not, fetch it from the database and store it in Redis.

Can you provide a code example for that?

Sure! Here's a simple example:

const redis = require('redis');
const client = redis.createClient();

async function getData(key) {
    const cachedData = await client.get(key);
    if (cachedData) {
        return JSON.parse(cachedData);
    }
    const data = await fetchFromDatabase(key);
    client.set(key, JSON.stringify(data));
    return data;
}

What if the data changes frequently?

In that case, you might want to implement cache invalidation strategies, such as setting an expiration time for the cache or using a message queue to update the cache when the data changes.