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C++

// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)
#pragma once
// Loggers registry of unique name->logger pointer
// An attempt to create a logger with an already existing name will result with spdlog_ex exception.
// If user requests a non existing logger, nullptr will be returned
// This class is thread safe
#include <spdlog/common.h>
#include <spdlog/details/periodic_worker.h>
#include <chrono>
#include <functional>
#include <memory>
#include <string>
#include <unordered_map>
#include <mutex>
namespace spdlog {
class logger;
namespace details {
class thread_pool;
class SPDLOG_API registry
{
public:
using log_levels = std::unordered_map<std::string, level::level_enum>;
registry(const registry &) = delete;
registry &operator=(const registry &) = delete;
void register_logger(std::shared_ptr<logger> new_logger);
void initialize_logger(std::shared_ptr<logger> new_logger);
std::shared_ptr<logger> get(const std::string &logger_name);
std::shared_ptr<logger> default_logger();
// Return raw ptr to the default logger.
// To be used directly by the spdlog default api (e.g. spdlog::info)
// This make the default API faster, but cannot be used concurrently with set_default_logger().
// e.g do not call set_default_logger() from one thread while calling spdlog::info() from another.
logger *get_default_raw();
// set default logger.
// default logger is stored in default_logger_ (for faster retrieval) and in the loggers_ map.
void set_default_logger(std::shared_ptr<logger> new_default_logger);
void set_tp(std::shared_ptr<thread_pool> tp);
std::shared_ptr<thread_pool> get_tp();
// Set global formatter. Each sink in each logger will get a clone of this object
void set_formatter(std::unique_ptr<formatter> formatter);
void enable_backtrace(size_t n_messages);
void disable_backtrace();
void set_level(level::level_enum log_level);
void flush_on(level::level_enum log_level);
template<typename Rep, typename Period>
void flush_every(std::chrono::duration<Rep, Period> interval)
{
std::lock_guard<std::mutex> lock(flusher_mutex_);
auto clbk = [this]() { this->flush_all(); };
periodic_flusher_ = details::make_unique<periodic_worker>(clbk, interval);
}
void set_error_handler(err_handler handler);
void apply_all(const std::function<void(const std::shared_ptr<logger>)> &fun);
void flush_all();
void drop(const std::string &logger_name);
void drop_all();
// clean all resources and threads started by the registry
void shutdown();
std::recursive_mutex &tp_mutex();
void set_automatic_registration(bool automatic_registration);
// set levels for all existing/future loggers. global_level can be null if should not set.
void set_levels(log_levels levels, level::level_enum *global_level);
static registry &instance();
void apply_logger_env_levels(std::shared_ptr<logger> new_logger);
private:
registry();
~registry();
void throw_if_exists_(const std::string &logger_name);
void register_logger_(std::shared_ptr<logger> new_logger);
bool set_level_from_cfg_(logger *logger);
std::mutex logger_map_mutex_, flusher_mutex_;
std::recursive_mutex tp_mutex_;
std::unordered_map<std::string, std::shared_ptr<logger>> loggers_;
log_levels log_levels_;
std::unique_ptr<formatter> formatter_;
spdlog::level::level_enum global_log_level_ = level::info;
level::level_enum flush_level_ = level::off;
err_handler err_handler_;
std::shared_ptr<thread_pool> tp_;
std::unique_ptr<periodic_worker> periodic_flusher_;
std::shared_ptr<logger> default_logger_;
bool automatic_registration_ = true;
size_t backtrace_n_messages_ = 0;
};
} // namespace details
} // namespace spdlog
#ifdef SPDLOG_HEADER_ONLY
# include "registry-inl.h"
#endif