-type sequence() :: term().

Identifier of a volatile sequence

-type cu_tuple() :: {classy:site(),
                     non_neg_integer(),
                     pos_integer()}.

Cluster-unique tuple

-type su_tuple() :: {non_neg_integer(), pos_integer()}.

Site-unique tuple

-spec
     cluster_unique_seq_tuple(sequence()) -> cu_tuple().

Similar to classy_uid:site_unique_seq_tuple/1, but includes site name.

-spec site_unique_seq_tuple(sequence()) -> su_tuple().

Return a tuple that is guaranteed to be unique within sequence ID and site.

It consists of number of restarts followed by a value of a volatile counter identified by sequence ID. Sequence counter gets reset on node restart.

This function is expected to be slower than classy_uid:site_unique_tuple/0, but its values form a monotonic sequence.

-spec cluster_unique_tuple() -> cu_tuple().

Return a tuple similar to classy_uid:site_unique_tuple/0, but also including site id, which makes it unique within the cluster.

Cluster-unique tuples can be used to order events on the originator site, but not globally.

-spec site_unique_tuple() -> su_tuple().

Return a tuple that is unique within the site (across restarts), but is NOT unique in a cluster.

SeqTuple returned by this function consists of a number of node restarts followed by a erlang:unique_integer.

Site-unique tuples can be used to order events within the site.