Erlang - 从主管模块启动一个孩子 [英] Erlang - Starting a child from the supervisor module

问题描述

我正在尝试创建一个处理添加动态gen_servers的主管。因为某些原因是失败的，我不太确定什么。

I'm trying to create a supervisor which handles adding dynamic gen_servers. for a reason something is failing and I'm not really sure what.

-module(supervisor_mod).
-behaviour(supervisor).

-export([start_link/0, add_child/1]).
-export([init/1]).

start_link() ->
    Pid=supervisor:start_link({local, ?MODULE} , ?MODULE, []),
    {ok,Pid}.

init(_Args) ->
    {ok, {{simple_one_for_one, 10, 60},
          [{example_proc, {example_proc, start_link, []},
            permanent, brutal_kill, worker, [example_proc]}]}}.

add_child(Name)->                                                                        
    supervisor:start_child(supervisor_mod,
                           {example_proc, {example_proc, start_link, []},
                            permanent, brutal_kill, worker, [example_proc]}).

和

-module(example_proc).
-behaviour(gen_server).

-export([start_link/0]).
-export([init/1, handle_call/3, handle_cast/2]).

start_link() ->
    gen_server:start_link(?MODULE, [], []).

init(Args) ->
    io:format("~p (~p) started...~n", [Args, self()]),
    {ok, []}.

handle_call(alloc, From, State) ->
    {reply, From, State}.

handle_cast({free, _Ch}, State) ->
    {noreply, State}.

在erl shell中：

in erl shell:

Eshell V5.8.2  (abort with ^G)
1> supervisor_mod:start_link().
{ok,{ok,<0.33.0>}}
2> supervisor_mod:add_child(aa).
{error,{'EXIT',{badarg,[{erlang,apply,
                                [example_proc,start_link,
                                 {example_proc,{example_proc,start_link,[]},
                                               permanent,brutal_kill,worker,
                                               [example_proc]}]},
                        {supervisor,do_start_child_i,3},
                        {supervisor,handle_call,3},
                        {gen_server,handle_msg,5},
                        {proc_lib,init_p_do_apply,3}]}}}

任何帮助/解释/解决方案感谢
/ s。

Any help/explanation/solution is appreciated, /s.

推荐答案

阅读 OTP Doc：在简单的一个策略中，在start_child函数中，您可以将参数作为列表传递给孩子的小孩start_link功能。

Read OTP Doc: in case of simple one for one strategy, in start_child function you can pass arguments as a list for the child start_link function of the child.

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