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68 lines
2.2 KiB
68 lines
2.2 KiB
/* Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#include <sstream>
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//#define SYSD_DBUG 1
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namespace sysd {
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void notify_connect();
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void notify();
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template <typename T, typename... Ts>
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inline void notify(T t, Ts... ts);
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/**
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Class wrapping the "globals" as static members so that they can only
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be accessed from the friend-declared notify functions.
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*/
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class NotifyGlobals {
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static int socket;
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static std::stringstream fmt;
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NotifyGlobals() = delete;
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friend void notify_connect();
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friend void notify();
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template <typename T, typename... Ts>
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friend void notify(T t, Ts... ts);
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};
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/**
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Takes a variable number of arguments of different type and formats
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them on NotifyGlobals::fmt, and sends result to notification socket.
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@param t current argument to format
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@param ts remaining args parameter pack for recursive call
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*/
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template <typename T, typename... Ts>
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inline void notify(T t, Ts... ts) {
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#ifndef _WIN32
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#ifndef SYSD_DBUG
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if (NotifyGlobals::socket == -1) {
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return;
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}
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#endif /* not defined SYSD_DBUG */
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NotifyGlobals::fmt << t;
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notify(ts...);
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#endif /* not defined _WIN32 */
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}
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} // namespace sysd
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