asio/example/cpp03/services/basic_logger.hpp
2019-02-17 19:59:39 -10:00

84 lines
1.9 KiB
C++

//
// basic_logger.hpp
// ~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// 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)
//
#ifndef SERVICES_BASIC_LOGGER_HPP
#define SERVICES_BASIC_LOGGER_HPP
#include <boost/asio.hpp>
#include <boost/noncopyable.hpp>
#include <string>
namespace services {
/// Class to provide simple logging functionality. Use the services::logger
/// typedef.
template <typename Service>
class basic_logger
: private boost::noncopyable
{
public:
/// The type of the service that will be used to provide timer operations.
typedef Service service_type;
/// The native implementation type of the timer.
typedef typename service_type::impl_type impl_type;
/// Constructor.
/**
* This constructor creates a logger.
*
* @param context The execution context used to locate the logger service.
*
* @param identifier An identifier for this logger.
*/
explicit basic_logger(boost::asio::execution_context& context,
const std::string& identifier)
: service_(boost::asio::use_service<Service>(context)),
impl_(service_.null())
{
service_.create(impl_, identifier);
}
/// Destructor.
~basic_logger()
{
service_.destroy(impl_);
}
/// Get the io_context associated with the object.
boost::asio::io_context& get_io_context()
{
return service_.get_io_context();
}
/// Set the output file for all logger instances.
void use_file(const std::string& file)
{
service_.use_file(impl_, file);
}
/// Log a message.
void log(const std::string& message)
{
service_.log(impl_, message);
}
private:
/// The backend service implementation.
service_type& service_;
/// The underlying native implementation.
impl_type impl_;
};
} // namespace services
#endif // SERVICES_BASIC_LOGGER_HPP