Commandsrpoplpush
RPOPLPUSH
Apply for Redis Developer Course
|
Redis Regular Inspection / Technical Support
|
Redis Enterprise Server
|
|---|
Pop from the right of a list and push to the left
Usage: rpoplpush src_key dest_key.
The result is the same as RPOP + LPUSH, but this command is atomic.
Example: Reliable queue
| Command> | lpush src_key msg_1 msg_2 msg_3 |
| Result> | 3 |
| Command> | lpush dest_key msg_A msg_B msg_C |
| Result> | 3 |
| Command> | rpoplpush src_key dest_key |
| Result> | msg_1 |
| Command> | lrange src_key 0 -1 |
| Result> | 0) msg_3 1) msg_2 |
| Command> | lrange dest_key 0 -1 |
| Result> | 0) msg_1 1) msg_C 2) msg_B 3) msg_A |
Circular list
You can set src_key and dest_key to the same key.
That makes a circular list.
Example: Circular list
| Command> | lpush key msg_1 msg_2 msg_3 |
| Result> | 3 |
| Command> | lrange key 0 -1 |
| Result> | 0) msg_3 1) msg_2 2) msg_1 |
| Command> | rpoplpush key key |
| Result> | msg_1 |
| Command> | lrange key 0 -1 |
| Result> | 0) msg_1 1) msg_3 2) msg_2 |
Syntax
RPOPLPUSH source destination
- Available since version 1.2.0.
- Time complexity is O(1).
| Related commands | RPOP, LPUSH |
| Clients for Java | Jedis, Lettuce, Redisson | Clients for C | Hiredis |
| << LMOVE | RPOPLPUSH | LPUSHX >> |
|---|
Email
답글이 올라오면 이메일로 알려드리겠습니다.
