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0.1.0
Spawn is the core lib for Spawn Actors System
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lib/spawn/cluster/state_handoff/controllers/persistent_controller.ex
defmodule Spawn.Cluster.StateHandoff.Controllers.PersistentController do
@moduledoc """
`StateHandoffPersistentController` is a StateHandoff Controller basead on `Statestore` mechanism.
"""
use Nebulex.Caching
require Logger
@behaviour Spawn.Cluster.StateHandoff.ControllerBehaviour
alias Spawn.Cache.LookupCache, as: Cache
@type node_type :: term()
@type opts :: Keyword.t()
@type data :: any()
@type new_data :: data()
@type id :: Eigr.Functions.Protocol.Actors.ActorId.t()
@type host :: Actors.Registry.HostActor.t()
@type hosts :: list(Actors.Registry.HostActor.t())
@type timer :: {atom(), integer()}
@otp_app :spawn
@ttl :timer.minutes(10)
@impl true
@spec clean(node(), data()) :: data()
def clean(node, data), do: handle_terminate(node, data)
@impl true
@spec get_by_id(id(), data()) :: {new_data(), hosts()}
@decorate cacheable(cache: Cache, keys: [id], opts: [ttl: @ttl])
def get_by_id(id, %{backend_adapter: backend} = data) do
{:ok, lookups} = backend.get_by_id(id)
hosts =
Enum.map(lookups, fn data = _lookup ->
:erlang.binary_to_term(data)
end)
{data, hosts}
end
@impl true
@spec handle_init(opts()) :: new_data() | {new_data(), timer()}
def handle_init(_opts) do
backend = Application.get_env(@otp_app, :state_handoff_controller_persistent_backend)
%{backend_adapter: backend}
end
@impl true
@spec handle_after_init(data()) :: new_data()
def handle_after_init(data), do: data
@impl true
@spec handle_terminate(node(), data()) :: new_data()
@decorate cache_evict(cache: Cache, key: node)
def handle_terminate(node, %{backend_adapter: backend} = data) do
backend.clean(node)
data
end
def handle_terminate(node, data) do
Logger.warning("Invalid terminate state for Node #{inspect(node)}. State: #{inspect(data)}")
end
@impl true
@spec handle_timer(any(), data()) :: new_data() | {new_data(), timer()}
def handle_timer(_event, data), do: data
@impl true
@spec handle_nodeup_event(node(), node_type(), data()) :: new_data()
def handle_nodeup_event(_node, _node_type, data), do: data
@impl true
@spec handle_nodedown_event(node(), node_type(), data()) :: new_data()
def handle_nodedown_event(_node, _node_type, data), do: data
@impl true
@spec set(id(), node(), host(), data) :: new_data()
def set(id, node, host, %{backend_adapter: backend} = data) do
bytes = :erlang.term_to_binary(host)
backend.set(id, node, bytes)
data
end
end