libplumbing/logging.h

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//
// plumbing - C++ wrapper facades for Berkeley sockets
// Copyright (C) 2009 Peter Miller
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License, version 3, as published
// by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along
// with this program. If not, see <http://www.gnu.org/licenses/>.
//

#ifndef LIBPLUMBING_LOGGING_H
#define LIBPLUMBING_LOGGING_H

#include <cstdarg>

#include <libplumbing/format_printf.h>

namespace plumbing {

class logging
{
public:
    virtual ~logging();

protected:
    logging();

public:
    void warning(const char *fmt, ...)                      FORMAT_PRINTF(2, 3);

    void warning_v(const char *fmt, va_list ap)             FORMAT_PRINTF(2, 0);

    void fatal_error(const char *fmt, ...)         NORETURN FORMAT_PRINTF(2, 3);

    void fatal_error_v(const char *fmt, va_list ap)
                                                   NORETURN FORMAT_PRINTF(2, 0);
    static logging &get_singleton();

    static void register_stream(logging *ls);

    void message(const char *fmt, ...)                      FORMAT_PRINTF(2, 3);

    void message_v(const char *fmt, va_list ap)             FORMAT_PRINTF(2, 0);

protected:
    virtual void deliver_message_text(const char *txt) = 0;

    void exit()                                                        NORETURN;

private:
    static logging *singleton;

    logging(const logging &);

    logging &operator=(const logging &);

    // This is so that logging_tee can call deliver_message_text
    // directly, a minor efficiency consideration.
    friend class logging_tee;
};

inline logging &log() { return logging::get_singleton(); }

}

#endif // LIBPLUMBING_LOGGING_H
// vim: set ts=8 sw=4 et

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