[redis] publish and subscribe

Publish and subscribe

What is publish and subscribe

Redis Publish subscribe (pub/sub) It's a message communication mode ： sender (pub) Send a message , subscriber (sub) receive messages .

Redis Clients can subscribe to any number of channels .

Redis Publish and subscribe to

The client can subscribe to channels, as shown in the figure below

When you post a message to this channel , The message is sent to the subscribing client

Publish and subscribe command line implementation

1. Open a client subscription channel1
2. 
3. command :SUBSCRIBE channel1
4. Open another client , to channel1 Release the news
5. 
6. command :publish channel1 hello
7.