Commandsblmove
BLMOVE
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Move data between lists - blocking
Pops an element from the source list and pushes it to the destination list.
Specify left/right when popping from the source list,
and left/right when pushing to the destination list.
LEFT can be read as first or head of the list,
and RIGHT as last or tail.
Like other blocking commands, if there is no data it waits until data arrives (timeout).
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> | blmove src_key dest_key left left 5 |
| Result> | msg_3 |
| Command> | lrange src_key 0 -1 |
| Result> |
1) "msg_2" 2) "msg_1" |
| Command> | lrange dest_key 0 -1 |
| Result> |
1) "msg_3" 2) "msg_C" 3) "msg_B" 4) "msg_A" |
Syntax
BLMOVE source destination LEFT|RIGHT LEFT|RIGHT timeout
- Available since version 6.2.0.
- Time complexity is O(1).
| Related commands | LMOVE |
| << BRPOP | BLMOVE | BRPOPLPUSH >> |
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