How can Redis be used?

There is more to Redis than just caching.

Redis can be used in a variety of scenarios as shown in the diagram.

• • Session

We can use Redis to share user session data among different services.

• • Cache

We can use Redis to cache objects or pages, especially for hotspot data.

• • Distributed lock

We can use a Redis string to acquire locks among distributed services.

• • Counter

We can count how many likes or how many reads for articles.

• • Rate limiter

We can apply a rate limiter for certain user IPs.

• • Global ID generator

We can use Redis Int for global ID.

• • Shopping cart

We can use Redis Hash to represent key-value pairs in a shopping cart.

• • Calculate user retention

We can use Bitmap to represent the user login daily and calculate user retention.

• • Message queue

We can use List for a message queue.

• • Ranking

We can use ZSet to sort the articles.