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%% 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) 2007-2020 VMware, Inc. or its affiliates. All rights reserved.
%%
-module(file_handle_cache_stats).
%% stats about read / write operations that go through the fhc.
-export([init/0, update/3, update/2, update/1, get/0]).
-define(TABLE, ?MODULE).
-define(COUNT,
[io_reopen, mnesia_ram_tx, mnesia_disk_tx,
msg_store_read, msg_store_write,
queue_index_journal_write, queue_index_write, queue_index_read]).
-define(COUNT_TIME, [io_sync, io_seek, io_file_handle_open_attempt]).
-define(COUNT_TIME_BYTES, [io_read, io_write]).
init() ->
_ = ets:new(?TABLE, [public, named_table]),
[ets:insert(?TABLE, {{Op, Counter}, 0}) || Op <- ?COUNT_TIME_BYTES,
Counter <- [count, bytes, time]],
[ets:insert(?TABLE, {{Op, Counter}, 0}) || Op <- ?COUNT_TIME,
Counter <- [count, time]],
[ets:insert(?TABLE, {{Op, Counter}, 0}) || Op <- ?COUNT,
Counter <- [count]].
update(Op, Bytes, Thunk) ->
{Time, Res} = timer_tc(Thunk),
_ = ets:update_counter(?TABLE, {Op, count}, 1),
_ = ets:update_counter(?TABLE, {Op, bytes}, Bytes),
_ = ets:update_counter(?TABLE, {Op, time}, Time),
Res.
update(Op, Thunk) ->
{Time, Res} = timer_tc(Thunk),
_ = ets:update_counter(?TABLE, {Op, count}, 1),
_ = ets:update_counter(?TABLE, {Op, time}, Time),
Res.
update(Op) ->
ets:update_counter(?TABLE, {Op, count}, 1),
ok.
get() ->
lists:sort(ets:tab2list(?TABLE)).
timer_tc(Thunk) ->
T1 = erlang:monotonic_time(),
Res = Thunk(),
T2 = erlang:monotonic_time(),
Diff = erlang:convert_time_unit(T2 - T1, native, micro_seconds),
{Diff, Res}.
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