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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.



-module(erldns_sup).

-moduledoc false.



-behaviour(supervisor).



-export([start_link/0]).

-export([gc/0, gc_registered/0, gc_registered/1]).



-export([init/1]).



%% Public API

-spec start_link() -> supervisor:startlink_ret().

start_link() ->

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



%% Garbage collect all processes.

-spec gc() -> integer().

gc() ->

    length(lists:map(fun erlang:garbage_collect/1, processes())).



%% Garbage collect all registered processes.

-spec gc_registered() -> integer().

gc_registered() ->

    length(lists:map(fun gc_registered/1, registered())).



%% Garbage collect a named process.

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

gc_registered(ProcessName) ->

    Pid = whereis(ProcessName),

    erlang:garbage_collect(Pid),

    ok.



%% Callbacks

init(_Args) ->

    Children =

        [

            worker(erldns_pg, pg, [erldns]),

            worker(erldns_zone_cache),

            worker(erldns_zone_parser),

            worker(erldns_zone_encoder),

            worker(erldns_packet_cache),

            worker(erldns_query_throttle),

            worker(erldns_handler),

            worker(erldns_pipeline),

            supervisor(erldns_listeners)

        ],

    {ok, {#{strategy => one_for_one, intensity => 20, period => 10}, Children}}.



worker(Name) ->

    worker(Name, Name, []).

worker(Name, Module, Args) ->

    child(worker, Name, Module, Args).



supervisor(Name) ->

    child(supervisor, Name, Name, []).



child(Type, Name, Module, Args) ->

    #{id => Name, start => {Module, start_link, Args}, type => Type}.