97 lines
3.7 KiB
Erlang
97 lines
3.7 KiB
Erlang
%%%-----------------------------------------------------------------------------
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%%% @Copyright (C) 2012-2015, Feng Lee <feng@emqtt.io>
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%%%
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%%% Permission is hereby granted, free of charge, to any person obtaining a copy
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%%% of this software and associated documentation files (the "Software"), to deal
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%%% in the Software without restriction, including without limitation the rights
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%%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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%%% copies of the Software, and to permit persons to whom the Software is
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%%% furnished to do so, subject to the following conditions:
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%%%
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%%% The above copyright notice and this permission notice shall be included in all
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%%% copies or substantial portions of the Software.
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%%%
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%%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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%%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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%%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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%%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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%%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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%%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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%%% SOFTWARE.
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%%%-----------------------------------------------------------------------------
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%%% @doc
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%%% emqttd simple queue.
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%%%
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%%% @end
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%%%-----------------------------------------------------------------------------
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%% TODO: this module should be removed...
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-module(emqttd_queue).
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-include("emqttd_packet.hrl").
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-export([new/1, new/2, in/3, all/1, clear/1]).
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-define(DEFAULT_MAX_LEN, 1000).
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-record(mqtt_queue_wrapper, {queue = queue:new(),
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max_len = ?DEFAULT_MAX_LEN,
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store_qos0 = false}).
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-type mqtt_queue() :: #mqtt_queue_wrapper{}.
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%%------------------------------------------------------------------------------
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%% @doc
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%% New Queue.
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%%
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%% @end
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%%------------------------------------------------------------------------------
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-spec new(non_neg_integer()) -> mqtt_queue().
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new(MaxLen) -> #mqtt_queue_wrapper{max_len = MaxLen}.
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new(MaxLen, StoreQos0) -> #mqtt_queue_wrapper{max_len = MaxLen, store_qos0 = StoreQos0}.
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%%------------------------------------------------------------------------------
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%% @doc
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%% Queue one message.
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%%
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%% @end
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%%------------------------------------------------------------------------------
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-spec in(binary(), mqtt_message(), mqtt_queue()) -> mqtt_queue().
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in(ClientId, Message = #mqtt_message{qos = Qos},
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Wrapper = #mqtt_queue_wrapper{queue = Queue, max_len = MaxLen}) ->
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case queue:len(Queue) < MaxLen of
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true ->
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Wrapper#mqtt_queue_wrapper{queue = queue:in(Message, Queue)};
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false -> % full
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if
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Qos =:= ?QOS_0 ->
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lager:warning("Queue ~s drop qos0 message: ~p", [ClientId, Message]),
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Wrapper;
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true ->
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{{value, Msg}, Queue1} = queue:drop(Queue),
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lager:warning("Queue ~s drop message: ~p", [ClientId, Msg]),
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Wrapper#mqtt_queue_wrapper{queue = Queue1}
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end
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end.
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%%------------------------------------------------------------------------------
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%% @doc
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%% Get all messages in queue.
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%%
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%% @end
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%%------------------------------------------------------------------------------
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-spec all(mqtt_queue()) -> list().
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all(#mqtt_queue_wrapper { queue = Queue }) -> queue:to_list(Queue).
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%%------------------------------------------------------------------------------
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%% @doc
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%% Clear queue.
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%%
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%% @end
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%%------------------------------------------------------------------------------
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-spec clear(mqtt_queue()) -> mqtt_queue().
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clear(Queue) -> Queue#mqtt_queue_wrapper{queue = queue:new()}.
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