added logging module and a sandbox project

include/matador/logger/log_domain.hpp

@@ -0,0 +1,118 @@
+#ifndef MATADOR_LOG_DOMAIN_HPP
+#define MATADOR_LOG_DOMAIN_HPP
+
+#include "matador/logger/log_level.hpp"
+#include "matador/logger/log_sink.hpp"
+
+#include <string>
+#include <list>
+#include <map>
+#include <mutex>
+
+namespace matador::logger {
+
+/**
+ * @brief Connection to a set of log sinks
+ *
+ * A log domain is the connection point between
+ * a set of log sinks and the logger objects
+ * in the user code.
+ *
+ * A domain consists of a unique name and a
+ * list of sinks
+ */
+class log_domain final
+{
+public:
+  /**
+   * The time format for each log line
+   */
+  static constexpr auto TIMESTAMP_FORMAT = "%Y-%m-%d %H:%M:%S.%f";
+
+  /**
+   * Creates a log_domain with the given name
+   * and the given log range
+   *
+   * @param name The name of the log domain
+   * @param log_range The log range of this domain
+   */
+  log_domain(std::string name, log_level_range log_range);
+
+  /**
+   * Returns the name of the domain
+   *
+   * @return The name of the domain
+   */
+  [[nodiscard]] std::string name() const;
+
+  /**
+   * Sets the max log level. The default
+   * max level is LVL_FATAL
+   *
+   * @param max_level max log level
+   */
+  void max_log_level(log_level max_level);
+
+  /**
+   * Returns the max log level
+   *
+   * @return The max log level
+   */
+  [[nodiscard]] log_level max_log_level() const;
+
+  /**
+   * Sets the min log level. Default
+   * min leven is LVL_INFO
+   *
+   * @param min_level min log level
+   */
+  void min_log_level(log_level min_level);
+
+  /**
+   * Returns the min log level
+   *
+   * @return The min log level
+   */
+  [[nodiscard]] log_level min_log_level() const;
+
+  /**
+   * Add a sink to the domain.
+   *
+   * The sink must be packed into a std::shared_ptr
+   * because it can be shared among other domains
+   *
+   * @param sink The sink to add
+   */
+  void add_sink(sink_ptr sink);
+
+  /**
+   * Logs the given message for the given source and log level
+   * to this log domain.
+   *
+   * @param lvl Log level
+   * @param source Source of the log message
+   * @param message Message to log
+   */
+  void log(log_level lvl, const std::string &source, const char *message);
+
+  /**
+   * Clears the list of log sinks
+   */
+  void clear();
+
+private:
+  void get_time_stamp(char* timestamp_buffer);
+
+private:
+  static std::map<log_level, std::string> level_strings;
+
+  std::string name_;
+  std::list<sink_ptr> sinks{};
+
+  log_level_range log_level_range_;
+
+  std::mutex mutex_;
+};
+
+}
+#endif //MATADOR_LOG_DOMAIN_HPP