Redis Brpop command
Redis Brpop command and get out of the last element of the list, if the list is not a list of the elements will be blocked until a timeout or a date can be found in the pop-up element.
grammar
redis Blpop basic command syntax is as follows:
redis 127.0.0.1:6379> BRPOP LIST1 LIST2 .. LISTN 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 a key element belongs is ejected, the second element is the value of the element to be ejected.
Examples
redis 127.0.0.1:6379> BRPOP list1 100
In the example above, the operation will be blocked, if the first element of the list specified key list1 presence data is returned, otherwise waits for 100 seconds will return nil.
(nil) (100.06s)