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* src/mod_offline.erl: Started implementation of mod_offline
quota. For now, it require change in code. Will be turn into a config file parameter soon. (EJAB-314). * src/p1_mnesia.erl: Added memory efficient record count in Mnesia. SVN Revision: 859
This commit is contained in:
Mickaël Rémond
parent
c72cb51c73
commit
9d03ea3f98
@ -1,3 +1,11 @@
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2007-08-07 Mickael Remond <mickael.remond@process-one.net>
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* src/mod_offline.erl: Started implementation of mod_offline
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quota. For now, it require change in code. Will be turn into a
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config file parameter soon. (EJAB-314).
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* src/p1_mnesia.erl: Added memory efficient record count in
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Mnesia.
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2007-08-03 Mickael Remond <mickael.remond@process-one.net>
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* src/mod_announce.erl: Added support to all the announce features
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@ -1,13 +1,13 @@
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%%%----------------------------------------------------------------------
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%%% File : mod_offline.erl
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%%% Author : Alexey Shchepin <alexey@sevcom.net>
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%%% Purpose :
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%%% Created : 5 Jan 2003 by Alexey Shchepin <alexey@sevcom.net>
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%%% Author : Alexey Shchepin <alexey@process-one.net>
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%%% Purpose : Store and manage offline messages in Mnesia database.
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%%% Created : 5 Jan 2003 by Alexey Shchepin <alexey@process-one.net>
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%%% Id : $Id$
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%%%----------------------------------------------------------------------
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-module(mod_offline).
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-author('alexey@sevcom.net').
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-author('alexey@process-one.net').
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-behaviour(gen_mod).
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@ -29,6 +29,10 @@
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-define(PROCNAME, ejabberd_offline).
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-define(OFFLINE_TABLE_LOCK_THRESHOLD, 1000).
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%% TODO: Move this part as a module config file parameter:
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%% Can be an integer > 0 or infinity:
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-define(MAX_OFFLINE_MSGS, infinity).
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start(Host, _Opts) ->
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mnesia:create_table(offline_msg,
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[{disc_only_copies, [node()]},
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@ -51,19 +55,28 @@ init() ->
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loop() ->
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receive
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#offline_msg{} = Msg ->
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Msgs = receive_all([Msg]),
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#offline_msg{us=US} = Msg ->
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Msgs = receive_all(US, [Msg]),
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Len = length(Msgs),
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F = fun() ->
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Count = Len + p1_mnesia:count_records(
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offline_msg,
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#offline_msg{us=US, _='_'}),
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if
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Len >= ?OFFLINE_TABLE_LOCK_THRESHOLD ->
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mnesia:write_lock_table(offline_msg);
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Count > ?MAX_OFFLINE_MSGS ->
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%% TODO: Warn that messages have been discarded
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ok;
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true ->
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ok
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end,
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lists:foreach(fun(M) ->
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mnesia:write(M)
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end, Msgs)
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if
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Len >= ?OFFLINE_TABLE_LOCK_THRESHOLD ->
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mnesia:write_lock_table(offline_msg);
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true ->
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ok
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end,
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lists:foreach(fun(M) ->
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mnesia:write(M)
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end, Msgs)
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end
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end,
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mnesia:transaction(F),
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loop();
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@ -71,10 +84,10 @@ loop() ->
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loop()
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end.
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receive_all(Msgs) ->
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receive_all(US, Msgs) ->
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receive
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#offline_msg{} = Msg ->
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receive_all([Msg | Msgs])
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#offline_msg{us=US} = Msg ->
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receive_all(US, [Msg | Msgs])
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after 0 ->
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Msgs
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end.
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@ -387,4 +400,3 @@ update_table() ->
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?INFO_MSG("Recreating offline_msg table", []),
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mnesia:transform_table(offline_msg, ignore, Fields)
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end.
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45
src/p1_mnesia.erl
Normal file
45
src/p1_mnesia.erl
Normal file
@ -0,0 +1,45 @@
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%% ``The contents of this file are subject to the Erlang Public License,
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%% Version 1.1, (the "License"); you may not use this file except in
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%% compliance with the License. You should have received a copy of the
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%% Erlang Public License along with this software. If not, it can be
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%% retrieved via the world wide web at http://www.erlang.org/.
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%%
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%% Software distributed under the License is distributed on an "AS IS"
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%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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%% the License for the specific language governing rights and limitations
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%% under the License.
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%%
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%% The Initial Developer of the Original Code is Process-one.
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%% Portions created by Process-one are Copyright 2007, Process-one
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%% All Rights Reserved.''
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%%
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%% $Id$
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%%
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-module(p1_mnesia).
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-author('mickael.remond@process-one.net').
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-export([count_records/2]).
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%% Return the number of records matching a given match expression.
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%% This function is intended to be used inside a Mnesia transaction.
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%% The count has been written to use the fewest possible memory by
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%% getting the record by small increment and by using continuation.
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-define(BATCHSIZE, 100).
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count_records(Tab, MatchExpression) ->
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%% the result contains the atom a for each match: We do not need
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%% actual values as we only count the data.
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case mnesia:select(Tab, [{MatchExpression, [], [a]}], ?BATCHSIZE, read) of
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{Result,Cont} ->
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Count = length(Result),
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count_records_cont(Cont, Count);
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'$end_of_table' ->
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0
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end.
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count_records_cont(Cont, Count) ->
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case mnesia:select(Cont) of
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{Result,Cont} ->
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NewCount = Count + length(Result),
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count_records_cont(Cont, NewCount);
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'$end_of_table' ->
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Count
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end.
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