私は今、これに対する問題が何であるかを理解しようとして気が狂っています。
基本的に、1 つのサーバーと 1 つの gen_event-behaviour モジュールで簡単なスーパーバイザーをセットアップしたいだけです。
今の問題は、それをもう開始できないことです。それはスーパーバイザーです。
何をしてもこのエラーが発生します: ** exception exit: noproc
text-tracer を使用すると、sRPG_supervisor:init/1 で発生することが示されます。そして、これでコードに何か問題があると思いますが、他の人の例を実行するとまったく同じ結果になります(Joe Armstrongsの例をダウンロードし、同じ結果でsellaprime_supervisorをテストしました)。
仮想Ubuntuインストールで実行すると、正常に起動していました。次に、Windowsでコーディングできるようにセットアップしましたが、これの最も単純な形式が機能することをテストしたことはなく、明らかに何らかの理由で機能しません。
したがって、誰かが同様の問題を抱えている場合は、解決策を見つけることができます! OTP 17 の Erlang バージョンとして erl6.3 を使用しています。
私が使用しているコードは次のとおりです。Emacs で生成されたスケルトンからビルドアップしたものです: sRPG_supervisor.erl
-module(sRPG_supervisor).
-behaviour(supervisor).
%% API
-export([start_link/0, start_link/1, start/0, start_in_shell_for_testing/0]).
%% Supervisor callbacks
-export([init/1]).
-define(SERVER, ?MODULE).
%%%===================================================================
%%% API functions
%%%===================================================================
%%--------------------------------------------------------------------
%% @doc
%% Starts the supervisor
%%
%% @spec start_link() -> {ok, Pid} | ignore | {error, Error}
%% @end
%%--------------------------------------------------------------------
start_link() ->
supervisor:start_link({local, ?SERVER}, ?MODULE, []).
start() ->
spawn(fun() ->
supervisor:start_link({local, ?SERVER}, ?MODULE, _Arg = [])
end).
start_in_shell_for_testing() ->
{ok, Pid} = supervisor:start_link({local, ?SERVER}, ?MODULE, _Arg = []),
unlink(Pid).
start_link(Args) ->
supervisor:start_link({local, ?SERVER}, ?MODULE, Args).
%%%===================================================================
%%% Supervisor callbacks
%%%===================================================================
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Whenever a supervisor is started using supervisor:start_link/[2,3],
%% this function is called by the new process to find out about
%% restart strategy, maximum restart frequency and child
%% specifications.
%%
%% @spec init(Args) -> {ok, {SupFlags, [ChildSpec]}} |
%% ignore |
%% {error, Reason}
%% @end
%%--------------------------------------------------------------------
init([]) ->
%% Install sRPG event/error handler
gen_event:swap_handler(alarm_handler, {alarm_handler, swap}, {sRPG_event_handler, xyz}),
RestartStrategy = one_for_one,
MaxRestarts = 1000,
MaxSecondsBetweenRestarts = 3600,
SupFlags = {RestartStrategy, MaxRestarts, MaxSecondsBetweenRestarts},
Restart = permanent,
Shutdown = 2000,
Type = worker,
AChild = {sRPG_server, {sRPG_server, start_link, []},
Restart, Shutdown, Type, [sRPG_server]},
{ok, {SupFlags, [AChild]}}.
sRPG_server.erl
-module(sRPG_server).
-behaviour(gen_server).
%% API
-export([start_link/0, testServer/0]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-define(SERVER, ?MODULE).
-record(state, {}).
%%%===================================================================
%%% API
%%%===================================================================
testServer() ->
gen_server:call(?MODULE, {test, test}).
%%--------------------------------------------------------------------
%% @doc
%% Starts the server
%%
%% @spec start_link() -> {ok, Pid} | ignore | {error, Error}
%% @end
%%--------------------------------------------------------------------
start_link() ->
gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).
%%%===================================================================
%%% gen_server callbacks
%%%===================================================================
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Initializes the server
%%
%% @spec init(Args) -> {ok, State} |
%% {ok, State, Timeout} |
%% ignore |
%% {stop, Reason}
%% @end
%%--------------------------------------------------------------------
init([]) ->
%% Note we must set trap_exit = true if we want
%% terminate/2 to be called when the application is stopped
process_flag(trap_exit, true),
%MainGamePid = gameSystem:start(),
io:format("~p starting~n", [?MODULE]),
{ok, #state{}}.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Handling call messages
%%
%% @spec handle_call(Request, From, State) ->
%% {reply, Reply, State} |
%% {reply, Reply, State, Timeout} |
%% {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, Reply, State} |
%% {stop, Reason, State}
%% @end
%%--------------------------------------------------------------------
handle_call({test, test}, _From, State) ->
io:format("TEST TEST TEST ~n"),
Reply = ok,
{reply, Reply, State};
handle_call(_Request, _From, State) ->
Reply = ok,
{reply, Reply, State}.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Handling cast messages
%%
%% @spec handle_cast(Msg, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% @end
%%--------------------------------------------------------------------
handle_cast(_Msg, State) ->
{noreply, State}.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Handling all non call/cast messages
%%
%% @spec handle_info(Info, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% @end
%%--------------------------------------------------------------------
handle_info(_Info, State) ->
{noreply, State}.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% This function is called by a gen_server when it is about to
%% terminate. It should be the opposite of Module:init/1 and do any
%% necessary cleaning up. When it returns, the gen_server terminates
%% with Reason. The return value is ignored.
%%
%% @spec terminate(Reason, State) -> void()
%% @end
%%--------------------------------------------------------------------
terminate(_Reason, _State) ->
ok.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Convert process state when code is changed
%%
%% @spec code_change(OldVsn, State, Extra) -> {ok, NewState}
%% @end
%%--------------------------------------------------------------------
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%%===================================================================
%%% Internal functions
%%%===================================================================
sRPG_event_handler.erl
-module(sRPG_event_handler).
-behaviour(gen_event).
%% API
-export([start_link/0, add_handler/0]).
%% gen_event callbacks
-export([init/1, handle_event/2, handle_call/2,
handle_info/2, terminate/2, code_change/3]).
-define(SERVER, ?MODULE).
-record(state, {}).
%%%===================================================================
%%% gen_event callbacks
%%%===================================================================
%%--------------------------------------------------------------------
%% @doc
%% Creates an event manager
%%
%% @spec start_link() -> {ok, Pid} | {error, Error}
%% @end
%%--------------------------------------------------------------------
start_link() ->
gen_event:start_link({local, ?SERVER}).
%%--------------------------------------------------------------------
%% @doc
%% Adds an event handler
%%
%% @spec add_handler() -> ok | {'EXIT', Reason} | term()
%% @end
%%--------------------------------------------------------------------
add_handler() ->
gen_event:add_handler(?SERVER, ?MODULE, []).
%%%===================================================================
%%% gen_event callbacks
%%%===================================================================
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Whenever a new event handler is added to an event manager,
%% this function is called to initialize the event handler.
%%
%% @spec init(Args) -> {ok, State}
%% @end
%%--------------------------------------------------------------------
init([]) ->
io:format("*** sRPG Event Handler init ***~n"),
{ok, #state{}};
init(Args) ->
io:format("*** sRPG Event Handler init: ~p~n", [Args]),
{ok, #state{}}.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Whenever an event manager receives an event sent using
%% gen_event:notify/2 or gen_event:sync_notify/2, this function is
%% called for each installed event handler to handle the event.
%%
%% @spec handle_event(Event, State) ->
%% {ok, State} |
%% {swap_handler, Args1, State1, Mod2, Args2} |
%% remove_handler
%% @end
%%--------------------------------------------------------------------
handle_event({set_alarm, testAlarm}, State) ->
error_logger:error_msg("*** BEEP BOOP TEST ALARM ***~n"),
{ok, State};
handle_event({clear_alarm, testAlarm}, State) ->
error_logger:error_msg("*** Brrrrppp... Test Alarm Over ***~n"),
{ok, State};
handle_event(_Event, State) ->
{ok, State}.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Whenever an event manager receives a request sent using
%% gen_event:call/3,4, this function is called for the specified
%% event handler to handle the request.
%%
%% @spec handle_call(Request, State) ->
%% {ok, Reply, State} |
%% {swap_handler, Reply, Args1, State1, Mod2, Args2} |
%% {remove_handler, Reply}
%% @end
%%--------------------------------------------------------------------
handle_call(_Request, State) ->
Reply = ok,
{ok, Reply, State}.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% This function is called for each installed event handler when
%% an event manager receives any other message than an event or a
%% synchronous request (or a system message).
%%
%% @spec handle_info(Info, State) ->
%% {ok, State} |
%% {swap_handler, Args1, State1, Mod2, Args2} |
%% remove_handler
%% @end
%%--------------------------------------------------------------------
handle_info(_Info, State) ->
{ok, State}.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Whenever an event handler is deleted from an event manager, this
%% function is called. It should be the opposite of Module:init/1 and
%% do any necessary cleaning up.
%%
%% @spec terminate(Reason, State) -> void()
%% @end
%%--------------------------------------------------------------------
terminate(_Reason, _State) ->
ok.
%%--------------------------------------------------------------------
%% @private
%% @doc
%% Convert process state when code is changed
%%
%% @spec code_change(OldVsn, State, Extra) -> {ok, NewState}
%% @end
%%--------------------------------------------------------------------
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%%===================================================================
%%% Internal functions
%%%===================================================================
何が起こるかの例を次に示します。
Eshell V6.3 (abort with ^G)
1> sRPG_supervisor:start_link().
** exception exit: noproc
2> sRPG_supervisor:start_in_shell_for_testing().
** exception exit: noproc
3> ServPid = sRPG_server:start_link().
sRPG_server starting
{ok,<0.39.0>}
4> gen_server:call(sRPG_server, {test, test}).
TEST TEST TEST
ok
ご覧のとおり、サーバーはスーパーバイザーなしで呼び出されたときに機能します。
他の人が抱えていた同様の問題をよく調べましたが、役に立ちませんでした。