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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(rabbit_fhc_helpers).
-export([clear_read_cache/0]).
-include("amqqueue.hrl").
clear_read_cache() ->
case application:get_env(rabbit, fhc_read_buffering) of
{ok, true} ->
file_handle_cache:clear_read_cache(),
clear_vhost_read_cache(rabbit_vhost:list_names());
_ -> %% undefined or {ok, false}
ok
end.
clear_vhost_read_cache([]) ->
ok;
clear_vhost_read_cache([VHost | Rest]) ->
clear_queue_read_cache(rabbit_amqqueue:list(VHost)),
clear_vhost_read_cache(Rest).
clear_queue_read_cache([]) ->
ok;
clear_queue_read_cache([Q | Rest]) when ?is_amqqueue(Q) ->
MPid = amqqueue:get_pid(Q),
SPids = amqqueue:get_slave_pids(Q),
%% Limit the action to the current node.
Pids = [P || P <- [MPid | SPids], node(P) =:= node()],
%% This function is executed in the context of the backing queue
%% process because the read buffer is stored in the process
%% dictionary.
Fun = fun(_, State) ->
_ = file_handle_cache:clear_process_read_cache(),
State
end,
[rabbit_amqqueue:run_backing_queue(Pid, rabbit_variable_queue, Fun)
|| Pid <- Pids],
clear_queue_read_cache(Rest).
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