Redis Brpoplpush command

Redis list (List)

Redis Brpoplpush command value from a pop-up list, pop elements into another list and return it; if there is no element of the list will block until a timeout or until the list can be found in the pop-up element.

grammar

redis Brpoplpush basic command syntax 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 ejected, it returns nil and a long waiting time within a specified time. On the other hand, returns a list containing two elements, the first element is the pop-up value of the element, the second element is to wait long.

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)

Redis list (List)