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
80
81
82
83
84
85
86
|
% Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
%
% Unless required by applicable law or agreed to in writing, software
% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
% License for the specific language governing permissions and limitations under
% the License.
-module(couch_views_batch).
-export([
start/1,
success/2,
failure/1
]).
-include_lib("couch_mrview/include/couch_mrview.hrl").
-type update_stats() :: #{
docs_read => non_neg_integer(),
tx_size => non_neg_integer(),
total_kvs => non_neg_integer()
}.
-export_type([update_stats/0]).
-callback start(
Mrst::#mrst{},
State::term()
) -> {NewState::term(), BatchSize::pos_integer()}.
-callback success(
Mrst::#mrst{},
UpdateStats::update_stats(),
State::term()
) -> NewState::term().
-callback failure(Mrst::#mrst{}, State::term()) -> NewState::term().
-define(DEFAULT_MOD, "couch_views_batch_impl").
-spec start(#mrst{}) -> pos_integer().
start(#mrst{} = Mrst) ->
{Mod, State} = case load_state() of
{M, S} ->
{M, S};
undefined ->
ModStr = config:get("couch_views", "batch_module", ?DEFAULT_MOD),
ModAtom = list_to_existing_atom(ModStr),
{ModAtom, undefined}
end,
{NewState, BatchSize} = Mod:start(Mrst, State),
save_state(Mod, NewState),
BatchSize.
-spec success(#mrst{}, UpdateStats::update_stats()) -> ok.
success(#mrst{} = Mrst, UpdateStats) ->
{Mod, State} = load_state(),
NewState = Mod:success(Mrst, UpdateStats, State),
save_state(Mod, NewState),
ok.
-spec failure(#mrst{}) -> ok.
failure(#mrst{} = Mrst) ->
{Mod, State} = load_state(),
NewState = Mod:failure(Mrst, State),
save_state(Mod, NewState),
ok.
load_state() ->
get(?MODULE).
save_state(Mod, State) ->
put(?MODULE, {Mod, State}).
|
