Redis Brpoplpush Command

Redis List

The Redis Brpoplpush command pops the last element from a list and inserts it into the head of another list; if the list has no elements, it blocks the list until the wait times out or a popable element is found.

Syntax

The basic syntax of 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 time. Otherwise, it returns a list containing two elements: the first element is the value of the popped element, and the second element is the waiting time.

Examples

# 非空列表

redis> BRPOPLPUSH msg reciver 500
"hello moto"                        # 弹出元素的值
(3.38s)                             # 等待时长

redis> LLEN reciver
(integer) 1

redis> LRANGE reciver 0 0
1) "hello moto"


# 空列表

redis> BRPOPLPUSH msg reciver 1
(nil)
(1.34s)

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