XLEN

Syntax

XLEN key

Time Complexity: O(1)

ACL categories: @read, @stream, @fast

Returns the number of entries inside a stream. If the specified key does not exist the command returns zero, as if the stream was empty. Note that a stream can be empty and hence XLEN is not a good option to check if a stream exists.

Streams are not auto-deleted once they have no entries inside (for instance after an XDEL call), because the stream may have consumer groups associated with it.

Return

Integer reply: the number of entries of the stream at key.

Example

dragonfly> XADD mystream * name John
"1623910120014-0"
dragonfly> XADD mystream * name Bob
"1623910194423-0"
dragonfly> XADD mystream * name Alice
"1623910226955-0"
dragonfly> XLEN mystream
(integer) 3