Redis Brpoplpush Command
The Redis Brpoplpush command removes the last element from a list and inserts it at the head of another list. If the list is empty, it blocks the list until a timeout occurs or a poppable element is found.
Syntax
The basic syntax for the redis Brpoplpush command is as follows:
redis 127.0.0.1:6379> BRPOPLPUSH LIST1 ANOTHER_LIST TIMEOUT
Available Versions
= 2.0.0
Return Value
If no element is popped within the specified time, it returns a nil and the waiting duration. Otherwise, it returns a list with two elements: the first element is the value of the popped element, and the second element is the waiting duration.
Example
# Non-empty list
redis> BRPOPLPUSH msg reciver 500
"hello moto" # Value of the popped element
(3.38s) # Waiting duration
redis> LLEN reciver
(integer) 1
redis> LRANGE reciver 0 0
1) "hello moto"
# Empty list
redis> BRPOPLPUSH msg reciver 1
(nil)
(1.34s)