redis brpoplpush命令

BRPOPLPUSH source destination timeout

BRPOPLPUSH is the blocking variant of RPOPLPUSH.
When source contains elements, this command behaves exactly like RPOPLPUSH.
When used inside a MULTI/EXEC block, this command behaves exactly like RPOPLPUSH.
When source is empty, Redis will block the connection until another client
pushes to it or until timeout is reached.
A timeout of zero can be used to block indefinitely.

See RPOPLPUSH for more information.

*返回值

Bulk string reply: the element being popped from source and pushed to destination.
If timeout is reached, a Null reply is returned.

*Pattern: Reliable queue

Please see the pattern description in the RPOPLPUSH documentation.

*Pattern: Circular list

Please see the pattern description in the RPOPLPUSH documentation.