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// The MIT License (MIT)
//
// Copyright (c) 2015-2017 Simon Ninon 
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

#pragma once

#include 
#include 
#include 
#include 

namespace cpp_redis {

//!
//!  logger_iface
//!  should be inherited by any class intended to be used for logging
//!
//!
class logger_iface {
public:
  //!
  //!  ctor
  //!
  //!
  logger_iface() = default;
  //!
  //!  dtor
  //!
  //!
  virtual ~logger_iface() = default;

  //!
  //!  copy ctor
  //!
  //!
  logger_iface(const logger_iface &) = default;
  //!
  //!  assignment operator
  //!
  //!
  logger_iface &operator=(const logger_iface &) = default;

public:
  //!
  //!  debug logging
  //!
  //!  @param msg message to be logged
  //!  @param file file from which the message is coming
  //!  @param line line in the file of the message
  //!
  //!
  virtual void debug(const string_t &msg, const string_t &file,
                     size_t line) = 0;

  //!
  //!  info logging
  //!
  //!  @param msg message to be logged
  //!  @param file file from which the message is coming
  //!  @param line line in the file of the message
  //!
  //!
  virtual void info(const string_t &msg, const string_t &file,
                    size_t line) = 0;

  //!
  //!  warn logging
  //!
  //!  @param msg message to be logged
  //!  @param file file from which the message is coming
  //!  @param line line in the file of the message
  //!
  //!
  virtual void warn(const string_t &msg, const string_t &file,
                    size_t line) = 0;

  //!
  //!  error logging
  //!
  //!  @param msg message to be logged
  //!  @param file file from which the message is coming
  //!  @param line line in the file of the message
  //!
  //!
  virtual void error(const string_t &msg, const string_t &file,
                     size_t line) = 0;
};

//!
//!  default logger class provided by the library
//!
//!
class logger : public logger_iface {
public:
  //!
  //!  log level
  //!
  //!
  enum class log_level { error = 0, warn = 1, info = 2, debug = 3 };

public:
  //!
  //!  ctor
  //!
  //!
  explicit logger(log_level level = log_level::info);
  //!
  //!  dtor
  //!
  //!
  ~logger() override = default;

  //!
  //!  copy ctor
  //!
  //!
  logger(const logger &) = default;
  //!
  //!  assignment operator
  //!
  //!
  logger &operator=(const logger &) = default;

public:
  //!
  //!  debug logging
  //!
  //!  @param msg message to be logged
  //!  @param file file from which the message is coming
  //!  @param line line in the file of the message
  //!
  //!
  void debug(const string_t &msg, const string_t &file,
             size_t line) override;

  //!
  //!  info logging
  //!
  //!  @param msg message to be logged
  //!  @param file file from which the message is coming
  //!  @param line line in the file of the message
  //!
  //!
  void info(const string_t &msg, const string_t &file,
            size_t line) override;

  //!
  //!  warn logging
  //!
  //!  @param msg message to be logged
  //!  @param file file from which the message is coming
  //!  @param line line in the file of the message
  //!
  //!
  void warn(const string_t &msg, const string_t &file,
            size_t line) override;

  //!
  //!  error logging
  //!
  //!  @param msg message to be logged
  //!  @param file file from which the message is coming
  //!  @param line line in the file of the message
  //!
  //!
  void error(const string_t &msg, const string_t &file,
             size_t line) override;

private:
  //!
  //!  current log level in use
  //!
  //!
  log_level m_level;

  //!
  //!  mutex used to serialize logs in multi-threaded environment
  //!
  //!
  std::mutex m_mutex;
};

//!
//!  variable containing the current logger
//!  by default, not set (no logs)
//!
//!
extern std::unique_ptr active_logger;

//!
//!  debug logging
//!  convenience function used internally to call the logger
//!
//!  @param msg message to be logged
//!  @param file file from which the message is coming
//!  @param line line in the file of the message
//!
//!
void debug(const string_t &msg, const string_t &file, size_t line);

//!
//!  info logging
//!  convenience function used internally to call the logger
//!
//!  @param msg message to be logged
//!  @param file file from which the message is coming
//!  @param line line in the file of the message
//!
//!
void info(const string_t &msg, const string_t &file, size_t line);

//!
//!  warn logging
//!  convenience function used internally to call the logger
//!
//!  @param msg message to be logged
//!  @param file file from which the message is coming
//!  @param line line in the file of the message
//!
//!
void warn(const string_t &msg, const string_t &file, size_t line);

//!
//!  error logging
//!  convenience function used internally to call the logger
//!
//!  @param msg message to be logged
//!  @param file file from which the message is coming
//!  @param line line in the file of the message
//!
//!
void error(const string_t &msg, const string_t &file, size_t line);

//!
//!  convenience macro to log with file and line information
//!
//!
#ifdef __CPP_REDIS_LOGGING_ENABLED
#define __CPP_REDIS_LOG(level, msg) cpp_redis::level(msg, __FILE__, __LINE__);
#else
#define __CPP_REDIS_LOG(level, msg)
#endif //!  __CPP_REDIS_LOGGING_ENABLED //!

} // namespace cpp_redis

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