CODEWITHSUNDEEP
redis
Pritam
Pritam

Reputation: 1400

Absolute and Sliding Caching In Redis

I want to implement Absolute and Sliding Caching In Redis. Does anyone have any resource link then it will be helpful

Upvotes: 12

Views: 15309

Answers (1)

Cybermaxs
Cybermaxs

Reputation: 24558

Redis already have many commands for this :

  • EXPIRE : Set a timeout on key.
  • EXPIREAT : Same as previous but takes an absolute Unix timestamp (seconds since January 1, 1970).
  • TTL : Returns the remaining time to live of a key that has a timeout

One important thing you have to know about Expiration on Redis : the timeout value is cleared only when the key is removed or overwritten using SET or GETSET. All others commands (INCR, LPUSH, HMSET, ...) will never change the initial timeout.

Absolute expiration is a native feature of Redis using EXPIRE. To implement a sliding expiration you simply need to reset to timeout value after each command.

A basic way to do this could be 

MULTI
GET MYKEY
EXPIRE MYKEY 60
EXEC

Upvotes: 20

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