Logger.cc

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/*

Copyright (C) 2011-2015 Michael Goffioul

This file is part of Octave.

Octave is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.

Octave 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 Octave; see the file COPYING.  If not, see
<http://www.gnu.org/licenses/>.

*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <QMutex>
#include <QMutexLocker>
#include <QProcessEnvironment>

#include <cstdio>

#include "Logger.h"

namespace QtHandles
{

Logger* Logger::s_instance = 0;
QMutex* Logger::s_mutex = 0;

Logger::Logger (void)
  : m_debugEnabled (false)
{
  QProcessEnvironment pe (QProcessEnvironment::systemEnvironment ());

  if (pe.value ("QTHANDLES_DEBUG", "0") != "0")
    m_debugEnabled = true;
}

Logger::~Logger (void)
{
}

Logger*
Logger::instance (void)
{
  if (! s_instance)
    {
      s_instance = new Logger ();
      s_mutex = new QMutex ();
    }

  return s_instance;
}

#define STATIC_LOGGER(fun) \
  void Logger::fun (const char* fmt, ...) \
  { \
    QMutexLocker lock (s_mutex); \
    va_list vl; \
    va_start (vl, fmt); \
    instance ()->fun ## V (fmt, vl); \
    va_end (vl); \
  }

STATIC_LOGGER (debug)

void
Logger::debugV (const char* fmt, va_list arg)
{
  if (m_debugEnabled)
    {
      vfprintf (stderr, fmt, arg);
      fprintf (stderr, "\n");
    }
}

}; // namespace QtHandles