Behaviour for parameter persistence backends.

Implementations handle loading and saving parameter values to durable storage. The store is initialized when a robot starts and closed when it stops.

Lifecycle

1. init/2 - Called during robot startup with module name and options
2. load/1 - Called to retrieve all persisted parameters
3. save/3 - Called after each successful parameter change
4. close/1 - Called during robot shutdown

Built-in Implementations

• BB.Parameter.Store.Dets - Disk-backed storage using OTP's :dets

Example Implementation

defmodule MyApp.ParameterStore do
  @behaviour BB.Parameter.Store

  @impl true
  def init(robot_module, opts) do
    # Initialize storage connection
    {:ok, %{robot: robot_module, conn: connect(opts)}}
  end

  @impl true
  def load(state) do
    # Return all stored parameters
    {:ok, fetch_all(state.conn)}
  end

  @impl true
  def save(state, path, value) do
    # Persist a parameter change
    :ok = write(state.conn, path, value)
    :ok
  end

  @impl true
  def close(state) do
    # Clean up resources
    disconnect(state.conn)
    :ok
  end
end