text: /*
   *          Copyright Andrey Semashev 2007 - 2015.
   * Distributed under the Boost Software License, Version 1.0.
   *    (See accompanying file LICENSE_1_0.txt or copy at
   *          http://www.boost.org/LICENSE_1_0.txt)
   */
  /*!
   * \file   main.cpp
   * \author Andrey Semashev
   * \date   26.04.2008
   *
   * \brief  An example of logging into a rotating text file.
   *         See the library tutorial for expanded comments on this code.
   *         It may also be worthwhile reading the Wiki requirements page:
   *         http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?Boost.Logging
   */
  
  // #define BOOST_LOG_DYN_LINK 1
  
  #include <stdexcept>
  #include <string>
  #include <iostream>
  #include <boost/smart_ptr/shared_ptr.hpp>
  #include <boost/date_time/posix_time/posix_time.hpp>
  
  #include <boost/log/common.hpp>
  #include <boost/log/expressions.hpp>
  #include <boost/log/attributes.hpp>
  #include <boost/log/sources/logger.hpp>
  #include <boost/log/sinks/sync_frontend.hpp>
  #include <boost/log/sinks/text_file_backend.hpp>
  
  namespace logging = boost::log;
  namespace attrs = boost::log::attributes;
  namespace src = boost::log::sources;
  namespace sinks = boost::log::sinks;
  namespace expr = boost::log::expressions;
  namespace keywords = boost::log::keywords;
  
  using boost::shared_ptr;
  
  enum { LOG_RECORDS_TO_WRITE = 10000 };
  
  int main(int argc, char* argv[])
  {
      try
      {
          // Create a text file sink
          typedef sinks::synchronous_sink< sinks::text_file_backend > file_sink;
          shared_ptr< file_sink > sink(new file_sink(
              keywords::file_name = "%Y%m%d_%H%M%S_%5N.log",      // file name pattern
              keywords::rotation_size = 16384                     // rotation size, in characters
              ));
  
          // Set up where the rotated files will be stored
          sink->locked_backend()->set_file_collector(sinks::file::make_collector(
              keywords::target = "logs",                          // where to store rotated files
              keywords::max_size = 16 * 1024 * 1024,              // maximum total size of the stored files, in bytes
              keywords::min_free_space = 100 * 1024 * 1024,       // minimum free space on the drive, in bytes
              keywords::max_files = 512                           // maximum number of stored files
              ));
  
          // Upon restart, scan the target directory for files matching the file_name pattern
          sink->locked_backend()->scan_for_files();
  
          sink->set_formatter
          (
              expr::format("%1%: [%2%] - %3%")
                  % expr::attr< unsigned int >("RecordID")
                  % expr::attr< boost::posix_time::ptime >("TimeStamp")
                  % expr::smessage
          );
  
          // Add it to the core
          logging::core::get()->add_sink(sink);
  
          // Add some attributes too
          logging::core::get()->add_global_attribute("TimeStamp", attrs::local_clock());
          logging::core::get()->add_global_attribute("RecordID", attrs::counter< unsigned int >());
  
          // Do some logging
          src::logger lg;
          for (unsigned int i = 0; i < LOG_RECORDS_TO_WRITE; ++i)
          {
              BOOST_LOG(lg) << "Some log record";
          }
  
          return 0;
      }
      catch (std::exception& e)
      {
          std::cout << "FAILURE: " << e.what() << std::endl;
          return 1;
      }
  }
  