XLEN

Syntax

1. 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

1. dragonfly> XADD mystream * name John
2. "1623910120014-0"
3. dragonfly> XADD mystream * name Bob
4. "1623910194423-0"
5. dragonfly> XADD mystream * name Alice
6. "1623910226955-0"
7. dragonfly> XLEN mystream
8. (integer) 3