1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
#
# 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
alias Lkn.Core.Specs
@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 defpuppeteer(name, do: block) do
state_type = quote do Lkn.Core.Puppeteer.state end
key_type = quote do Lkn.Core.Puppeteer.k end
key_to_name = &(Lkn.Core.Name.puppeteer(&1))
quote do
defmodule unquote(name) do
unquote(Specs.gen_server_from_specs(block, key_type, key_to_name, state_type))
defmacro __using__(_) do
quote do
@behaviour unquote(__MODULE__)
@behaviour Lkn.Core.Puppeteer
use GenServer
alias Lkn.Core.Instance
alias Lkn.Core, as: L
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: Lkn.Core.Puppeteer.state,
}
@spec new(Puppeteer.t, Lkn.Core.Puppeteer.state) :: 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({:spec, {name, args}}, state) do
s = :erlang.apply(__MODULE__, name, [state.puppeteer_key|args]++[state.state])
{:noreply, %State{state|state: s}}
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 handle_call({:spec, {name, args}}, _call, state) do
{res, s} = :erlang.apply(__MODULE__, name, [state.puppeteer_key|args] ++ [state.state])
{:reply, res, %State{state|state: s}}
end
end
end
end
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 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
|