ceph/src/boost/libs/asio/example/cpp03/services/basic_logger.hpp

   1 //
   2 // basic_logger.hpp
   3 // ~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #ifndef SERVICES_BASIC_LOGGER_HPP
  12 #define SERVICES_BASIC_LOGGER_HPP
  13
  14 #include <boost/asio.hpp>
  15 #include <boost/noncopyable.hpp>
  16 #include <string>
  17
  18 namespace services {
  19
  20 /// Class to provide simple logging functionality. Use the services::logger
  21 /// typedef.
  22 template <typename Service>
  23 class basic_logger
  24   : private boost::noncopyable
  25 {
  26 public:
  27   /// The type of the service that will be used to provide timer operations.
  28   typedef Service service_type;
  29
  30   /// The native implementation type of the timer.
  31   typedef typename service_type::impl_type impl_type;
  32
  33   /// Constructor.
  34   /**
  35    * This constructor creates a logger.
  36    *
  37    * @param context The execution context used to locate the logger service.
  38    *
  39    * @param identifier An identifier for this logger.
  40    */
  41   explicit basic_logger(boost::asio::execution_context& context,
  42       const std::string& identifier)
  43     : service_(boost::asio::use_service<Service>(context)),
  44       impl_(service_.null())
  45   {
  46     service_.create(impl_, identifier);
  47   }
  48
  49   /// Destructor.
  50   ~basic_logger()
  51   {
  52     service_.destroy(impl_);
  53   }
  54
  55   /// Set the output file for all logger instances.
  56   void use_file(const std::string& file)
  57   {
  58     service_.use_file(impl_, file);
  59   }
  60
  61   /// Log a message.
  62   void log(const std::string& message)
  63   {
  64     service_.log(impl_, message);
  65   }
  66
  67 private:
  68   /// The backend service implementation.
  69   service_type& service_;
  70
  71   /// The underlying native implementation.
  72   impl_type impl_;
  73 };
  74
  75 } // namespace services
  76
  77 #endif // SERVICES_BASIC_LOGGER_HPP