Returns a specification to start this module under a supervisor.

See Supervisor.

Notifies synchronously of a new message coming from a channel.

@spec notify(
  publisher :: GenServer.name(),
  channel_name :: term(),
  message :: term(),
  metadata :: term()
) :: :ok | {:error, term()}

Notifies synchronously of a new message coming from a channel_name to a publisher with some metadata.

@spec start_link(Yggdrasil.Channel.t(), GenServer.options()) :: GenServer.on_start()

Starts a server to distribute messages in a channel. Additionally can receive GenServer options.

@spec stop(GenServer.name()) :: :ok

Stops a publisher.