@callback in_transaction?(Nebulex.Adapter.adapter_meta(), Nebulex.Cache.opts()) ::
  Nebulex.Cache.ok_error_tuple(boolean())

Returns {:ok, true} if the current process is inside a transaction; otherwise, {:ok, false} is returned.

If there's an error with executing the command, {:error, reason} is returned, where reason is the cause of the error.

See Nebulex.Cache.in_transaction?/1.

@callback transaction(Nebulex.Adapter.adapter_meta(), fun(), Nebulex.Cache.opts()) ::
  Nebulex.Cache.ok_error_tuple(any())

Runs the given function inside a transaction.

If an Elixir exception occurs, the exception will bubble up from the transaction function. If the cache aborts the transaction, it returns {:error, reason}.

A successful transaction returns the value returned by the function wrapped in a tuple as {:ok, value}.

See Nebulex.Cache.transaction/2.