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erldns

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Erlang Authoritative DNS Server

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erldns src erldns_sup.erl
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src/erldns_sup.erl 

%% Copyright (c) 2012-2020, DNSimple Corporation

%%

%% Permission to use, copy, modify, and/or distribute this software for any

%% purpose with or without fee is hereby granted, provided that the above

%% copyright notice and this permission notice appear in all copies.

%%

%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.



%% @doc Application supervisor. Supervises everything except the UDP and TCP

%% listeners and the zone checker.

-module(erldns_sup).



-behavior(supervisor).



% API

-export([start_link/0]).

-export([

    gc/0,

    gc_registered/0,

    gc_registered/1

]).

% Supervisor hooks

-export([init/1]).



-define(SUPERVISOR, ?MODULE).

%% Helper macro for declaring children of supervisor

-define(CHILD(I, Type, Args), {I, {I, start_link, Args}, permanent, 5000, Type, [I]}).



%% Public API

-spec start_link() -> any().

start_link() ->

    supervisor:start_link({local, ?SUPERVISOR}, ?MODULE, []).



%% @doc Garbage collect all processes.

-spec gc() -> integer().

gc() ->

    length(lists:map(fun(Pid) -> garbage_collect(Pid) end, processes())).



%% @doc Garbage collect all registered processes.

-spec gc_registered() -> integer().

gc_registered() ->

    length(lists:map(fun(ProcessName) -> gc_registered(ProcessName) end, registered())).



%% @doc Garbage collect a named process.

-spec gc_registered(atom()) -> ok.

gc_registered(ProcessName) ->

    Pid = whereis(ProcessName),

    garbage_collect(Pid),

    ok.



%% Callbacks

init(_Args) ->

    SysProcs =

        [

            ?CHILD(erldns_metrics, worker, []),

            ?CHILD(erldns_events, worker, []),

            ?CHILD(erldns_zone_cache, worker, []),

            ?CHILD(erldns_zone_parser, worker, []),

            ?CHILD(erldns_zone_encoder, worker, []),

            ?CHILD(erldns_packet_cache, worker, []),

            ?CHILD(erldns_query_throttle, worker, []),

            ?CHILD(erldns_handler, worker, []),

            ?CHILD(sample_custom_handler, worker, [])

        ],



    {ok, {{one_for_one, 20, 10}, SysProcs}}.