zypp/target/CommitLog.h

   1  /*---------------------------------------------------------------------\
   2 |                          ____ _   __ __ ___                          |
   3 |                         |__  / \ / / . \ . \                         |
   4 |                           / / \ V /|  _/  _/                         |
   5 |                          / /__ | | | | | |                           |
   6 |                         /_____||_| |_| |_|                           |
   7 |                                                                      |
   8 \---------------------------------------------------------------------*/
   9 /** \file zypp/target/CommitLog.h
  10  *
  11 */
  12 #ifndef ZYPP_TARGET_COMMITLOG_H
  13 #define ZYPP_TARGET_COMMITLOG_H
  14
  15 #include <iosfwd>
  16
  17 #include "zypp/Pathname.h"
  18
  19 namespace zypp {
  20   namespace target {
  21
  22     ///////////////////////////////////////////////////////////////////
  23     //
  24     //  CLASS NAME : CommitLog
  25     /**
  26      * Simple wrapper for progress log. Refcnt, filename and corresponding
  27      * ofstream are static members. Logfile constructor raises, destructor
  28      * lowers refcounter. On refcounter changing from 0->1, file is opened.
  29      * Changing from 1->0 the file is closed. Thus Logfile objects should be
  30      * local to those functions, writing the log, and must not be stored
  31      * permanently;
  32      *
  33      * Usage:
  34      *  some methothd ()
  35      *  {
  36      *    CommitLog progresslog;
  37      *    ...
  38      *    progresslog() << "some message" << endl;
  39      *    ...
  40      *  }
  41      **/
  42     class CommitLog {
  43       CommitLog( const CommitLog & );
  44       CommitLog & operator=( const CommitLog & );
  45     private:
  46       static std::ofstream _log;
  47       static unsigned _refcnt;
  48       static Pathname _fname;
  49
  50       static void openLog();
  51       static void closeLog();
  52       static void refUp();
  53       static void refDown();
  54     public:
  55       CommitLog() { refUp(); }
  56       ~CommitLog() { refDown(); }
  57       std::ostream & operator()( bool timestamp = false );
  58       static void setFname( const Pathname & fname_r );
  59       static const Pathname & fname();
  60     };
  61     ///////////////////////////////////////////////////////////////////
  62
  63   } // namespace target
  64 } // namespace zypp
  65
  66
  67 #endif // ZYPP_TARGET_COMMITLOG_H