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
|
%% 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) 2007-2021 VMware, Inc. or its affiliates. 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, clean_up_temporary_reference_count_entries_without_file/1, 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.
clean_up_temporary_reference_count_entries_without_file(State) ->
MatchHead = #msg_location { file = undefined, _ = '_' },
ets:select_delete(State #state.table, [{MatchHead, [], [true]}]),
ok.
terminate(#state { table = MsgLocations, dir = Dir }) ->
case ets:tab2file(MsgLocations, filename:join(Dir, ?FILENAME),
[{extended_info, [object_count]}]) of
ok -> ok;
{error, Err} ->
rabbit_log:error("Unable to save message store index"
" for directory ~p.~nError: ~p~n",
[Dir, Err])
end,
ets:delete(MsgLocations).
|
