Diagnostic.h

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//# Diagnostic.h: debugging diagnostic for dbus clents
//# Copyright (C) 2012
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 of the License, or (at your
//# option) any later version.
//#
//# This library 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 Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//#        Internet email: aips2-request@nrao.edu.
//#        Postal address: AIPS++ Project Office
//#                        National Radio Astronomy Observatory
//#                        520 Edgemont Road
//#                        Charlottesville, VA 22903-2475 USA
//#
//# $Id$

#ifndef CASA_DBUS_DIAGNOSTIC_H_
#define CASA_DBUS_DIAGNOSTIC_H_
#include <string>
#include <stdarg.h>

namespace casa {
        namespace dbus {

                class Diagnostic {
                        public:
                                friend class init_diagnostic_object_t;
                                void argv( int argc_, const char *argv_[] ) {
                                        kernel_t &k = lock_kernel( );
                                        if ( k.do_log( ) ) k.argv(argc_,argv_);
                                        release_kernel( );
                                }
                                void argv( int argc_, char *argv_[] ) {
                                        kernel_t &k = lock_kernel( );
                                        if ( k.do_log( ) ) k.argv(argc_,argv_);
                                        release_kernel( );
                                }
                                Diagnostic( ) { }
                                virtual ~Diagnostic( ) { }

                                void error(const char *fmt, ...) {
                                        kernel_t &k = lock_kernel( );
                                        if ( k.do_log( ) ) {
                                                va_list argp;
                                                va_start(argp, fmt);
                                                verror(k, fmt, argp);
                                                va_end(argp);
                                        }
                                }

                                void info(const char *fmt, ...) {
                                        kernel_t &k = lock_kernel( );
                                        if ( k.do_log( ) ) {
                                                va_list argp;
                                                va_start(argp, fmt);
                                                vinfo(k, fmt, argp);
                                                va_end(argp);
                                        }
                                }

                        private:

                                struct kernel_t {
                                        kernel_t( );
                                        kernel_t( FILE *f );
                                        bool do_log( ) const { return fptr != 0; }
                                        ~kernel_t( ) { if ( fptr ) fclose(fptr); }
                                        void argv( int argc_, const char *argv_[] );
                                        void argv( int argc_, char *argv_[] );
                                        FILE *fptr;
                                        pid_t pid;
                                        std::string name;  /**** any non-argv messages should include 'name' ****/
                                };

                                /* void verror(Diagnostic::kernel_t &, const char *fmt, va_list argp); */
                                /* void vinfo(Diagnostic::kernel_t &, const char *fmt, va_list argp); */
                                void verror(kernel_t &, const char *fmt, va_list argp);
                                void vinfo(kernel_t &, const char *fmt, va_list argp);

                                kernel_t &lock_kernel( );
                                void release_kernel( ) { }
                                void output_prologue( );
                                void output_epilogue( );
                };

                Diagnostic diagnostic;

                static class init_diagnostic_object_t {
                        public:
                                init_diagnostic_object_t( ) { if ( count++ == 0 ) diagnostic.output_prologue( ); }
                                ~init_diagnostic_object_t( ) { if ( --count == 0 ) { diagnostic.output_epilogue( ); } }
                        private:
                                static unsigned long count;
                } init_diagnostic_object_;
        }
}

#endif