Packages
ra
2.0.13
3.1.9
3.1.8
3.1.7
3.1.6
3.1.5
3.1.4
3.1.3
3.1.2
3.1.1
3.1.0
3.0.2
3.0.1
3.0.0
3.0.0-beta.1
2.17.3
2.17.2
2.17.1
2.17.0
2.16.13
2.16.12
2.16.11
2.16.10
2.16.9
2.16.8
2.16.7
2.16.6
2.16.5
2.16.4
2.16.3
2.16.2
2.16.1
2.16.0
2.16.0-pre.12
2.16.0-pre.11
2.16.0-pre.10
2.16.0-pre.9
2.16.0-pre.8
2.16.0-pre.7
2.16.0-pre.6
2.16.0-pre.5
2.16.0-pre.4
2.16.0-pre.3
2.16.0-pre.2
2.16.0-pre.1
2.15.4
2.15.3
2.15.2
2.15.1
2.15.0
2.14.0
2.13.6
2.13.5
2.13.4
2.13.3
2.13.2
2.13.1
2.13.0
2.13.0-pre.1
2.12.0
2.11.0
2.11.0-pre.1
2.10.2-pre.2
2.10.2-pre.1
2.10.1
2.10.0
2.10.0-pre.3
2.10.0-pre.2
2.10.0-pre.1
2.9.10-pre.1
2.9.1
2.9.1-pre.2
2.9.1-pre.1
2.9.0
2.8.0
retired
2.7.3
2.7.2
2.7.1
2.7.0
2.7.0-pre.3
2.7.0-pre.2
2.7.0-pre.1
2.6.3
2.6.2
2.6.1
2.6.0-pre.1
2.5.1
2.5.1-pre.1
2.5.0
2.4.9
2.4.8
2.4.7
2.4.6
2.4.5
2.4.4
2.4.3
2.4.2
retired
2.4.1
2.4.0
2.3.0
2.2.0
2.1.0
2.0.13
2.0.12
2.0.11
2.0.10
2.0.9
2.0.8
2.0.7
2.0.6
2.0.5
2.0.4
2.0.3
2.0.2
2.0.1
2.0.0
1.1.9
1.1.8
1.1.7
1.1.6
1.1.5
1.1.4
1.1.3
1.1.2
1.1.1
1.1.0
1.0.8
1.0.7
1.0.6
1.0.5
1.0.4
1.0.3
1.0.2
1.0.1
1.0.0
0.9.6
0.9.5
0.9.4
0.9.2
0.3.3
retired
0.3.2
retired
0.3.1
retired
Raft library
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Files
src/ra_counters.erl
%% 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) 2017-2022 VMware, Inc. or its affiliates. All rights reserved.
%%
-module(ra_counters).
-export([
init/0,
new/2,
fetch/1,
overview/0,
overview/1,
delete/1
]).
-type name() :: term().
-spec init() -> ok.
init() ->
_ = ets:new(?MODULE, [set, named_table, public]),
ok.
-spec new(name(), [atom()]) -> counters:counters_ref().
new(Name, Fields)
when is_list(Fields) ->
Size = length(Fields),
CRef = counters:new(Size, []),
ok = register_counter(Name, CRef, Fields),
CRef.
-spec fetch(name()) -> undefined | counters:counters_ref().
fetch(Name) ->
case ets:lookup(?MODULE, Name) of
[{Name, Ref, _}] ->
Ref;
_ ->
undefined
end.
-spec delete(term()) -> ok.
delete(Name) ->
true = ets:delete(?MODULE, Name),
ok.
-spec overview() -> #{name() => #{atom() => non_neg_integer()}}.
overview() ->
ets:foldl(
fun({Name, Ref, Fields}, Acc) ->
Size = length(Fields),
Values = [counters:get(Ref, I) || I <- lists:seq(1, Size)],
Counters = maps:from_list(lists:zip(Fields, Values)),
Acc#{Name => Counters}
end, #{}, ?MODULE).
-spec overview(name()) -> #{atom() => non_neg_integer()}.
overview(Name) ->
case ets:lookup(?MODULE, Name) of
[{Name, Ref, Fields}] ->
Size = length(Fields),
Values = [counters:get(Ref, I) || I <- lists:seq(1, Size)],
maps:from_list(lists:zip(Fields, Values));
_ ->
undefined
end.
%% internal
register_counter(Name, Ref, Size) ->
true = ets:insert(?MODULE, {Name, Ref, Size}),
ok.