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3.7.16
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3.7.16-rc.2
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3.7.16-rc.1
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3.7.16-beta.1
3.7.15
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3.0.2
0.0.0-rc.1
Modules shared by rabbitmq-server and rabbitmq-erlang-client
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Files
src/ets_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) 2007-2017 Pivotal Software, Inc. All rights reserved.
%%
-module(ets_compat).
%% Those functions are exported for internal use only, not for public
%% consumption.
-export([update_counter/4,
update_counter_pre_18/4,
update_counter_post_18/4]).
-export([update_element/3,
update_element_pre_18/3,
update_element_post_18/3]).
-erlang_version_support([
{18, [
{update_counter, 4,
update_counter_pre_18,
update_counter_post_18},
{update_element, 3,
update_element_pre_18,
update_element_post_18}
]}
]).
%% ets:update_counter(Tab, Key, Incr, Default) appeared in Erlang 18.x.
%% We need a wrapper for Erlang R16B03 and Erlang 17.x.
update_counter(Tab, Key, Incr, Default) ->
code_version:update(?MODULE),
?MODULE:update_counter(Tab, Key, Incr, Default).
update_counter_pre_18(Tab, Key, Incr, Default) ->
%% The wrapper tries to update the counter first. If it's missing
%% (and a `badarg` is raised), it inserts the default value and
%% tries to update the counter one more time.
try
ets:update_counter(Tab, Key, Incr)
catch
_:badarg ->
try
%% There is no atomicity here, so between the
%% call to `ets:insert_new/2` and the call to
%% `ets:update_counter/3`, the the counters have
%% a temporary value (which is not possible with
%% `ets:update_counter/4). Furthermore, there is a
%% chance for the counter to be removed between those
%% two calls as well.
ets:insert_new(Tab, Default),
ets:update_counter(Tab, Key, Incr)
catch
_:badarg ->
%% We can't tell with just `badarg` what the real
%% cause is. We have no way to decide if we should
%% try to insert/update the counter again, so let's
%% do nothing.
0
end
end.
update_counter_post_18(Tab, Key, Incr, Default) ->
ets:update_counter(Tab, Key, Incr, Default).
%% ets:update_element(Tab, Key, ElementSpec) appeared in Erlang 18.x.
%% We need a wrapper for Erlang R16B03 and Erlang 17.x.
update_element(Tab, Key, ElementSpec) ->
code_version:update(?MODULE),
?MODULE:update_element(Tab, Key, ElementSpec).
update_element_pre_18(Tab, Key, {Pos, Value}) ->
case ets:lookup(Tab, Key) of
[] ->
ok;
[Tuple] ->
ets:insert(Tab, setelement(Pos, Tuple, Value))
end.
update_element_post_18(Tab, Key, ElementSpec) ->
ets:update_element(Tab, Key, ElementSpec).