trace_logger.hh

//
// This file is part of khmer, http://github.com/ged-lab/khmer/, and is
// Copyright (C) Michigan State University, 2009-2013. It is licensed under
// the three-clause BSD license; see doc/LICENSE.txt.
// Contact: khmer-project@idyll.org
//

#ifndef TRACE_LOGGER_HH
#define TRACE_LOGGER_HH

#include <cstdarg>
#include <cstdio>

#include "khmer.hh"


namespace khmer
{


struct TraceLogger {

    enum {
        TLVL_ALL	= 0,
        TLVL_DEBUG9, TLVL_DEBUG8, TLVL_DEBUG7, TLVL_DEBUG6, TLVL_DEBUG5,
        TLVL_DEBUG4, TLVL_DEBUG3, TLVL_DEBUG2, TLVL_DEBUG1, TLVL_DEBUG0,
        TLVL_INFO9, TLVL_INFO8, TLVL_INFO7, TLVL_INFO6, TLVL_INFO5,
        TLVL_INFO4, TLVL_INFO3, TLVL_INFO2, TLVL_INFO1, TLVL_INFO0,
        TLVL_WARNING	= 30,
        TLVL_ERROR	= 40,
        TLVL_CRITICAL	= 50,
        TLVL_NONE	= 255
    };
#ifdef WITH_INTERNAL_TRACING
    TraceLogger( uint8_t const level, FILE * stream_handle );
#endif
    TraceLogger(
        uint8_t const level, char const * const file_name_format, ...
    );
    ~TraceLogger( );

    inline void	    operator( )(
        uint8_t const level, char const * const format, ...
    ) const
#ifdef WITH_INTERNAL_TRACING
    {
        va_list varargs;

        if (_level <= level) {
            va_start( varargs, format );
            vfprintf( _stream_handle, format, varargs );
            va_end( varargs );
            fflush( _stream_handle );
        }

    }
#else	// WITH_INTERNAL_TRACING
    { }
#endif	// !WITH_INTERNAL_TRACING

private:
#ifdef WITH_INTERNAL_TRACING
    bool	    _shared_stream;
    uint8_t	    _level;
    FILE *	    _stream_handle;
#endif
};



} // namespace khmer


#endif // TRACE_LOGGER_HH

// vim: set ft=cpp sts=4 sw=4 tw=80: