4.9.6 maybe_init_the_site(MaybeSite) ¶

-spec maybe_init_the_site(classy:site() |
                          undefined) -> ok.

Initialize local site and cluster.

Initialization of the site ID is done as following:

1. If the site ID is already stored in the DB, then it is kept as is and nothing is done.
2. If the value not stored, and is provided as a binary argument, then the argument is used as the new site ID.
3. If the value is not stored, and the argument is undefined, then site ID is initialized to a random value.

When site ID changes, classy:on_create_site/2 callback runs.

Cluster ID initialization logic is similar, but there’s no way to customize the initial value. That has to do with the classy’s requirement that cluster IDs change to an entirely new value when site is kicked. classy:on_create_cluster/2 hook is called for the new clusters.