dgMultifileLog.h

00001 // -*- c++ -*-
00002 //
00003 // $Id$
00004 //
00005 // This program is free software; you can redistribute it and/or modify
00006 // it under the terms of the GNU General Public License as published by
00007 // the Free Software Foundation; either version 2 of the License, or
00008 // (at your option) any later version.
00009 //
00010 // This program is distributed in the hope that it will be useful,
00011 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013 // GNU General Public License for more details.
00014 //
00015 // You should have received a copy of the GNU General Public License
00016 // along with this program; if not, write to the Free Software
00017 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00018 //
00019 // This file is part of Depression Glass library.
00020 //
00021 // Copyright (c) 2002. Dimitry Kloper <kloper@users.sf.net> . 
00022 //
00023 // dgMultifileLog.h -- multifile log funnel
00024 //
00025 
00026 #ifndef _dgMultifileLog_h_
00027 #define _dgMultifileLog_h_
00028 
00035 #include <iostream>
00036 #include <fstream>
00037 #include <string>
00038 
00039 #include "dgFunnel.h"
00040 
00041 namespace DGD {
00042 
00063 class multifile_log: public funnel {
00064    public:
00076       class Split_criteria {
00077          public:
00078             virtual bool operator () ( unsigned long volume,
00079                                        unsigned long line, 
00080                                        unsigned long column,
00081                                        unsigned long bytes ) const = 0;
00082       };
00083 
00088       class Dont_split: public Split_criteria {
00089          public:
00090             bool operator () (  unsigned long volume,
00091                                 unsigned long line, 
00092                                unsigned long column,
00093                                unsigned long bytes ) const { return false; };
00094       };
00095 
00101       class Split_by_size: public Split_criteria  {
00102          public:
00103             Split_by_size() : m_vol_size(1024*1024*5) {} // 5M per volume
00104             Split_by_size( unsigned long vol_size ) : m_vol_size(vol_size) {}
00105 
00106             bool operator () ( unsigned long volume,
00107                                unsigned long line, 
00108                                unsigned long column,
00109                                unsigned long bytes ) const { 
00110                return ( bytes >= volume * m_vol_size ); 
00111             }
00112          private:
00113             unsigned long m_vol_size;
00114       };
00115 
00121       class Split_by_lines: public Split_criteria  {
00122          public:
00123             Split_by_lines() : m_vol_size(60000) {} // ~5M per volume
00124             Split_by_lines( unsigned long vol_size ) : m_vol_size(vol_size) {}
00125             Split_by_lines( const Split_by_lines& peer ) : 
00126                m_vol_size( peer.m_vol_size ) {}
00127 
00128             bool operator () ( unsigned long volume,
00129                                unsigned long line, 
00130                                unsigned long column,
00131                                unsigned long bytes ) const { 
00132                return ( line >= volume * m_vol_size ); 
00133             }
00134          private:
00135             unsigned long m_vol_size;
00136       };
00137 
00138    public:
00139       static Dont_split dont_split;
00140       static Split_by_size split_by_size;
00141       static Split_by_lines split_by_lines;
00142             
00143    public:
00144       multifile_log( const char* name, 
00145                      Split_criteria* criteria = &split_by_size );
00146       ~multifile_log();
00147 
00148    private:
00149       void operator () ( unsigned long line, 
00150                          unsigned long column,
00151                          unsigned long bytes );
00152       std::string real_name() const;
00153       
00154    private:
00155       std::ofstream m_file;
00156       std::string   m_name;
00157       unsigned int  m_part_count;
00158       Split_criteria* m_split;
00159 };
00160 
00161 
00162 }; // end of namespace DGD
00163 
00164 #endif /* _dgMultifileLog_h_ */
00165 
00166 /* 
00167  * Local Variables:
00168  * compile-command: "make dgMultifileLog.obj"
00169  * End:
00170  */
00171 
00172