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%% This Source Code Form is subject to the terms of the Mozilla Public
%% License, v. 2.0. If a copy of the MPL was not distributed with this
%% file, You can obtain one at https://mozilla.org/MPL/2.0/.
%%
%% Copyright (c) 2007-2020 VMware, Inc. or its affiliates. All rights reserved.
%%
-module(rabbit_mqtt_retained_msg_store_dets).
-behaviour(rabbit_mqtt_retained_msg_store).
-include("rabbit_mqtt.hrl").
-export([new/2, recover/2, insert/3, lookup/2, delete/2, terminate/1]).
-record(store_state, {
%% DETS table name
table
}).
new(Dir, VHost) ->
Tid = open_table(Dir, VHost),
#store_state{table = Tid}.
recover(Dir, VHost) ->
case open_table(Dir, VHost) of
{error, _} -> {error, uninitialized};
{ok, Tid} -> {ok, #store_state{table = Tid}}
end.
insert(Topic, Msg, #store_state{table = T}) ->
ok = dets:insert(T, #retained_message{topic = Topic, mqtt_msg = Msg}).
lookup(Topic, #store_state{table = T}) ->
case dets:lookup(T, Topic) of
[] -> not_found;
[Entry] -> Entry
end.
delete(Topic, #store_state{table = T}) ->
ok = dets:delete(T, Topic).
terminate(#store_state{table = T}) ->
ok = dets:close(T).
open_table(Dir, VHost) ->
dets:open_file(rabbit_mqtt_retained_msg_store:table_name_for(VHost),
table_options(rabbit_mqtt_util:path_for(Dir, VHost, ".dets"))).
table_options(Path) ->
[{type, set}, {keypos, #retained_message.topic},
{file, Path}, {ram_file, true}, {repair, true},
{auto_save, rabbit_misc:get_env(rabbit_mqtt,
retained_message_store_dets_sync_interval, 2000)}].
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