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Modules shared by rabbitmq-server and rabbitmq-erlang-client
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src/rand_compat.erl
%% The contents of this file are subject to the Mozilla Public License
%% Version 1.1 (the "License"); you may not use this file except in
%% compliance with the License. You may obtain a copy of the License
%% at http://www.mozilla.org/MPL/
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and
%% limitations under the License.
%%
%% The Original Code is RabbitMQ.
%%
%% The Initial Developer of the Original Code is GoPivotal, Inc.
%% Copyright (c) 2016 Pivotal Software, Inc. All rights reserved.
%%
-module(rand_compat).
%% We don't want warnings about the use of erlang:now/0 in
%% this module.
-compile(nowarn_deprecated_function).
%% Declare versioned functions to allow dynamic code loading,
%% depending on the Erlang version running. See 'code_version.erl' for details
-erlang_version_support([
{18, [
{seed, 1, seed_pre_18, seed_post_18},
{seed, 2, seed_pre_18, seed_post_18},
{uniform, 0, uniform_pre_18, uniform_post_18},
{uniform, 1, uniform_pre_18, uniform_post_18},
{uniform_s, 1, uniform_s_pre_18, uniform_s_post_18},
{uniform_s, 2, uniform_s_pre_18, uniform_s_post_18}
]}
]).
-export([
seed/1, seed_pre_18/1, seed_post_18/1,
seed/2, seed_pre_18/2, seed_post_18/2,
uniform/0, uniform_pre_18/0, uniform_post_18/0,
uniform/1, uniform_pre_18/1, uniform_post_18/1,
uniform_s/1, uniform_s_pre_18/1, uniform_s_post_18/1,
uniform_s/2, uniform_s_pre_18/2, uniform_s_post_18/2
]).
-define(IS_ALG(A), (A =:= exs64 orelse A =:= exsplus orelse A =:= exs1024)).
%% export_seed_s/1 can't be implemented with `random`.
%% export_seed_s/2. can't be implemented with `random`.
%% normal_s/1 can't be implemented with `random`.
%% normal_s/2. can't be implemented with `random`.
%% seed/1.
seed(AlgOrExpState) ->
code_version:update(?MODULE),
?MODULE:seed(AlgOrExpState).
seed_pre_18(Alg) when ?IS_ALG(Alg) -> random:seed();
seed_pre_18(ExpState) -> random:seed(ExpState).
seed_post_18(AlgOrExpState) -> rand:seed(AlgOrExpState).
%% seed/2.
seed(Alg, ExpState) ->
code_version:update(?MODULE),
?MODULE:seed(Alg, ExpState).
seed_pre_18(_Alg, ExpState) -> random:seed(ExpState).
seed_post_18(Alg, ExpState) -> rand:seed(Alg, ExpState).
%% seed_s/1 can't be implemented with `random`.
%% seed_s/2. can't be implemented with `random`.
%% uniform/0.
uniform() ->
code_version:update(?MODULE),
?MODULE:uniform().
ensure_random_seed() ->
case get(random_seed) of
undefined ->
random:seed(erlang:phash2([node()]),
time_compat:monotonic_time(),
time_compat:unique_integer());
_ -> ok
end.
uniform_pre_18() ->
ensure_random_seed(),
random:uniform().
uniform_post_18() -> rand:uniform().
%% uniform/1.
uniform(N) ->
code_version:update(?MODULE),
?MODULE:uniform(N).
uniform_pre_18(N) ->
ensure_random_seed(),
random:uniform(N).
uniform_post_18(N) -> rand:uniform(N).
%% uniform_s/1.
uniform_s(State) ->
code_version:update(?MODULE),
?MODULE:uniform_s(State).
uniform_s_pre_18(State) -> random:uniform_s(State).
uniform_s_post_18(State) -> rand:uniform_s(State).
%% uniform_s/2.
uniform_s(N, State) ->
code_version:update(?MODULE),
?MODULE:uniform_s(N, State).
uniform_s_pre_18(N, State) -> random:uniform_s(N, State).
uniform_s_post_18(N, State) -> rand:uniform_s(N, State).