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#
# lkn.core: an entity-component-system (ecs) implementation for lyxan
# Copyright (C) 2017 Thomas Letan <contact@thomasletan.fr>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
defmodule Lkn.Core.Puppeteer do
alias Lkn.Core.Instance
alias Lkn.Core.Name
@typedoc """
A key to identify and reach a given Puppeteer.
"""
@type k :: any
@typedoc """
A module which implements the Puppeteer behaviour.
"""
@type m :: module
@type init_args :: any
@type state :: any
defmacro __using__(state: state_t) do
quote do
use Lkn.Prelude
use GenServer
alias Lkn.Core.Instance
alias Lkn.Core, as: L
@type state :: unquote(state_t)
defmodule State do
@moduledoc false
defstruct [
:puppeteer_key,
:map_key,
:instance_key,
:state,
]
@type t :: %State{
puppeteer_key: Puppeteer.k,
instance_key: Lkn.Prelude.Option.t(Instance.k),
map_key: Lkn.Prelude.Option.t(L.Map.k),
state: unquote(state_t),
}
@spec new(Puppeteer.t, unquote(state_t)) :: t
def new(pk, s) do
%State{
puppeteer_key: pk,
instance_key: Lkn.Prelude.Option.nothing(),
map_key: Lkn.Prelude.Option.nothing(),
state: s,
}
end
end
def init({puppeteer_key, args}) do
{:ok, s} = init_state(args)
{:ok, State.new(puppeteer_key, s)}
end
def handle_cast({:leave_instance, instance_key}, state) do
if state.instance_key == Lkn.Prelude.Option.some(instance_key) do
s2 = leave_instance(state.state, instance_key)
Instance.unregister_puppeteer(instance_key, state.puppeteer_key)
{:noreply, %State{state|instance_key: Lkn.Prelude.Option.nothing(), state: s2}}
else
{:noreply, state}
end
end
def handle_cast({:specific, msg}, state) do
s2 = puppeteer_handle_cast(msg, state.state)
{:noreply, %State{state|state: s2}}
end
def handle_call({:find_instance, map_key}, _from, state) do
instance_key = Lkn.Core.Pool.register_puppeteer(map_key, state.puppeteer_key, __MODULE__)
state = %State{state|instance_key: Lkn.Prelude.Option.some(instance_key)}
{:reply, instance_key, state}
end
def puppeteer_handle_cast(_msg, state) do
state
end
def handle_info(msg, state) do
state = %State{state|state: handle_message(state.state, msg)}
{:noreply, state}
end
def cast(puppeteer_key, msg) do
GenServer.cast(Name.puppeteer(puppeteer_key), {:specific, msg})
end
@behaviour Lkn.Core.Puppeteer
defoverridable [
puppeteer_handle_cast: 2,
]
end
end
@spec start_link(m, k, init_args) :: GenServer.on_start
def start_link(module, puppeteer_key, args) do
GenServer.start_link(module, {puppeteer_key, args}, name: Name.puppeteer(puppeteer_key))
end
@callback handle_message(state, any) :: state
@callback init_state(init_args) :: {:ok, state}|:error
@callback leave_instance(state, Instance.k) :: state
@spec leave_instance(k, Instance.k) :: :ok
def leave_instance(puppeteer_key, instance_key) do
GenServer.cast(Name.puppeteer(puppeteer_key), {:leave_instance, instance_key})
end
@spec find_instance(k, L.Map.k) :: Instance.k
def find_instance(puppeteer_key, map_key) do
GenServer.call(Name.puppeteer(puppeteer_key), {:find_instance, map_key})
end
end
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