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Basic Pub Sub With Redis

Category: Redis

Aysnchronous messaging between a publisher and subscribers improves application scalability, resilience, and supports use of a dynamic network topology. Redis supports this messaging pattern using pub/sub channels.

Subscribe to a channel

Assume you want to subscribe to two channels called "purchases" and "registrations". Issue the following command using the Redis CLI:

127.0.0.1:6379> SUBSCRIBE purchases registrations

Another client can publish a message to either of these channels. In this example, we will notify subscribers to the "registrations" channel that a user with the email address buddy.guy@jazzclub.com registered for using a hypothetical system.

127.0.0.1:6379> PUBLISH registrations buddy.guy@jazzclub.com

Unsubscribe from a channel

To unsubscribe from a channel, issue the following command:

127.0.0.1:6379> UNSUBSCRIBE purchases registrations

If no channel names are provided, the client will unsubscribe from all channels.

Note: Pub/Sub has no relation to the database key space. Scoping can be achieved using a prefix for the channel name.