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Spawn is the core lib for Spawn Actors System

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spawn lib actors actor state_manager_behaviour.ex
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lib/actors/actor/state_manager_behaviour.ex 

defmodule Actors.Actor.StateManager.Behaviour do

  @moduledoc """

  `StateManager.Behaviour` Defines behavior that allows an Actor's state

  to be saved to persistent storage using database drivers.

  """



  @type projection_type :: module()

  @type table_name :: String.t()

  @type data :: struct()

  @type query :: String.t()

  @type params :: struct()

  @type opts :: Keyword.t()



  @callback is_new?(String.t(), any()) :: {:error, term()} | boolean()



  @callback load(String.t()) :: {:ok, term()} | {:not_found, %{}} | {:error, term()}



  @callback load(String.t(), number()) :: {:ok, term()} | {:not_found, %{}} | {:error, term()}



  @callback save(String.t(), term(), Keyword.t()) ::

              {:ok, term(), String.t()}

              | {:error, term(), term(), term()}

              | {:error, term(), term()}



  @callback save_async(String.t(), term(), Keyword.t()) ::

              {:ok, term(), String.t()}

              | {:error, term(), term(), term()}

              | {:error, term(), term()}



  @callback projection_create_or_update_table(projection_type(), table_name()) :: :ok



  @callback projection_upsert(projection_type(), table_name(), data()) :: :ok



  @callback projection_query(projection_type(), query(), params(), opts()) ::

              {:error, term()} | {:ok, data()}

end