What is the function of Pub/Sub in Redis
What is the role of Pub/Sub in Redis? I believe many inexperienced people don't know what to do about it. Therefore, this paper summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.
Redis publishes commands related to the subscription model.
PSUBSCRIBE
Earliest available version: 2.0.0
Time complexity: O (N), N is the number of subscribed clients.
A client that subscribes to a given rule in the following forms:
H?llo subscribes to hello,hallo, hxllo, etc.
H*llo subscribes to hllo, heeeello, etc.
H [ae] subscribe to hello and hallo, but not to hillo
If you want to match verbatim, use\ to escape special characters.
PUBLISH
Earliest available version: 2.0.0
Time complexity: O (NumberM), N is the number of subscribed clients, M is the total number of subscriptions
Post a message to the specified channel.
PUBSUB
Earliest available version: 2.8.0
Time complexity: O (N), N is the number of active channels
This command is used to check the status of the Pub/Sub subsystem.
1PUBSUB CHANNELS [pattern]
List the currently active channels (with at least one subscriber). However, if you do not specify pattern, all channels are listed.
1PUBSUB NUMSUB [channel-1... Channel-N]
Returns the subscriber of the specified channel.
1PUBSUB NUMPAT
Returns the number of subscriptions for the specified pattern (executed using the PSUBSCRIBE command)
PUNSUBSCRIBE
Earliest available version: 2.0.0
Time complexity: O (NumberM), N is the number of subscriptions that have been subscribed by clients that match rules, and M is the total number of subscriptions to matching rules in the system
Usage: PUNSUBSCRIBE [pattern [pattern …]]
Unsubscribe all channels that match the rules, or unsubscribe all channels if no rules are specified.
SUBSCRIBE
Earliest available version: 2.0.0
Time complexity: O (N), N is the number of subscription channels
Subscribe to the specified channel to the client.
After reading the above, have you mastered the role of Pub/Sub in Redis? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!
