@spec add(Yggdrasil.Channel.t(), pid()) :: :ok | {:error, binary()}

Adds a pid to the channel.

Returns a specification to start this module under a supervisor.

See Supervisor.

@spec connected(Yggdrasil.Channel.t()) :: :ok | {:error, binary()}

Reports the connection of the adapter.

@spec disconnected(Yggdrasil.Channel.t()) :: :ok | {:error, binary()}

Reports the disconnection of the adapter.

@spec remove(Yggdrasil.Channel.t(), pid()) :: :ok | {:error, binary()}

Removes a pid from the channel.

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

Starts a manager with a channel.

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

Stops a manager with an optional reason.

@spec subscribed?(Yggdrasil.Channel.t(), nil | pid()) :: boolean()

Whether the pid is subscribed or not to the channel.