1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
%% 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) 2007-2014 GoPivotal, Inc. All rights reserved.
%%
-module(rabbit_msg_store_ets_index).
-include("rabbit_msg_store.hrl").
-behaviour(rabbit_msg_store_index).
-export([new/1, recover/1,
lookup/2, insert/2, update/2, update_fields/3, delete/2,
delete_object/2, delete_by_file/2, terminate/1]).
-define(MSG_LOC_NAME, rabbit_msg_store_ets_index).
-define(FILENAME, "msg_store_index.ets").
-record(state, { table, dir }).
new(Dir) ->
file:delete(filename:join(Dir, ?FILENAME)),
Tid = ets:new(?MSG_LOC_NAME, [set, public, {keypos, #msg_location.msg_id}]),
#state { table = Tid, dir = Dir }.
recover(Dir) ->
Path = filename:join(Dir, ?FILENAME),
case ets:file2tab(Path) of
{ok, Tid} -> file:delete(Path),
{ok, #state { table = Tid, dir = Dir }};
Error -> Error
end.
lookup(Key, State) ->
case ets:lookup(State #state.table, Key) of
[] -> not_found;
[Entry] -> Entry
end.
insert(Obj, State) ->
true = ets:insert_new(State #state.table, Obj),
ok.
update(Obj, State) ->
true = ets:insert(State #state.table, Obj),
ok.
update_fields(Key, Updates, State) ->
true = ets:update_element(State #state.table, Key, Updates),
ok.
delete(Key, State) ->
true = ets:delete(State #state.table, Key),
ok.
delete_object(Obj, State) ->
true = ets:delete_object(State #state.table, Obj),
ok.
delete_by_file(File, State) ->
MatchHead = #msg_location { file = File, _ = '_' },
ets:select_delete(State #state.table, [{MatchHead, [], [true]}]),
ok.
terminate(#state { table = MsgLocations, dir = Dir }) ->
ok = ets:tab2file(MsgLocations, filename:join(Dir, ?FILENAME),
[{extended_info, [object_count]}]),
ets:delete(MsgLocations).
|
