diff --git a/include/c11log/common.h b/include/c11log/common.h
index a33730f7..c34819c6 100644
--- a/include/c11log/common.h
+++ b/include/c11log/common.h
@@ -14,7 +14,6 @@ typedef enum
     WARNING,
     ERROR,
     CRITICAL,
-    FATAL,
     NONE = 99
 } level_enum;
 
diff --git a/include/c11log/details/line_logger.h b/include/c11log/details/line_logger.h
index ec3b3a21..64b4035e 100644
--- a/include/c11log/details/line_logger.h
+++ b/include/c11log/details/line_logger.h
@@ -46,7 +46,7 @@ public:
             _log_msg.logger_name = _callback_logger->name();
             _log_msg.time = log_clock::now();
             _log_msg.raw = _oss.str();
-            _callback_logger->_log_it(_log_msg);
+            _callback_logger->_log_msg(_log_msg);
         }
     }
 
diff --git a/include/c11log/factory.h b/include/c11log/factory.h
index a84e667e..dfca8bf3 100644
--- a/include/c11log/factory.h
+++ b/include/c11log/factory.h
@@ -1,60 +1,95 @@
 #pragma once
-
-#include <unordered_map>
-#include <string>
 #include <memory>
-#include <mutex>
-
+#include "logger.h"
+#include "sinks/file_sinks.h"
+#include "sinks/stdout_sinks.h"
 
+//
+// logger creation shotcuts
+//
 namespace c11log
 {
-namespace details
+namespace factory
 {
-class factory
+
+//
+// console loggers single/multi threaded
+//
+std::unique_ptr<logger> stdout_logger(const std::string& name = "")
 {
-public:
-    using logger_ptr = std::shared_ptr<c11log::logger>;
-    using logger_map = std::unordered_map<std::string, logger_ptr>;
-    std::shared_ptr<logger> create_logger(const std::string& name, logger::sinks_init_list, logger::formatter_ptr = nullptr);
-    logger_ptr get_logger(const std::string &name);
-    static factory& instance();
-
-private:
-    std::mutex _factory_mutex;
-    logger_map _factory;
-
-
-
-};
-}
+    auto sink = std::make_shared<sinks::stderr_sink_st>();
+    return std::unique_ptr<logger>(new logger(name, sink));
 }
 
-
-inline std::shared_ptr<c11log::logger> c11log::details::factory::create_logger(const std::string& name, logger::sinks_init_list sinks, logger::formatter_ptr formatter)
+std::unique_ptr<logger> stdout_logger_mt(const std::string& name = "")
 {
-    std::lock_guard<std::mutex> lock(_factory_mutex);
-    logger_ptr logger_p = std::make_shared<logger>(name, sinks, std::move(formatter));
-
-    _factory.insert(logger_map::value_type(name, logger_p));
-    return logger_p;
+    auto sink = std::make_shared<sinks::stderr_sink_mt>();
+    return std::unique_ptr<logger>(new logger(name, sink));
 }
 
-
-
-inline c11log::details::factory::logger_ptr c11log::details::factory::get_logger(const std::string &name)
+//
+// simple file logger single/multi threaded
+//
+std::unique_ptr<logger> simple_file_logger(const std::string& filename, const std::string& logger_name = "" )
 {
-    std::lock_guard<std::mutex> lock(_factory_mutex);
+    auto fsink = std::make_shared<sinks::simple_file_sink_st>(filename);
+    return std::unique_ptr<logger>(new c11log::logger(logger_name, fsink));
 
-    auto found = _factory.find(name);
-    if (found != _factory.end())
-        return found->second;
-    else
-        return logger_ptr(nullptr);
+}
+std::unique_ptr<logger> simple_file_logger_mt(const std::string& filename, const std::string& logger_name = "")
+{
+    auto fsink = std::make_shared<sinks::simple_file_sink_mt>(filename);
+    return std::unique_ptr<logger>(new c11log::logger(logger_name, fsink));
 }
 
-
-inline c11log::details::factory & c11log::details::factory::instance()
+//
+// daily file logger single/multi threaded
+//
+std::unique_ptr<logger> daily_file_logger(
+    const std::string &filename,
+    const std::string &extension,
+    const std::size_t flush_every,
+    const std::string& logger_name = "")
 {
-    static factory instance;
-    return instance;
+    auto fsink = std::make_shared<sinks::daily_file_sink_st>(filename, extension, flush_every);
+    return std::unique_ptr<logger>(new c11log::logger(logger_name, fsink));
 }
+
+std::unique_ptr<logger> daily_file_logger_mt(
+    const std::string &filename,
+    const std::string &extension,
+    const std::size_t flush_every,
+    const std::string& logger_name = "")
+{
+    auto fsink = std::make_shared<sinks::daily_file_sink_mt>(filename, extension, flush_every);
+    return std::unique_ptr<logger>(new c11log::logger(logger_name, fsink));
+}
+
+//
+// rotating file logger single/multi threaded
+//
+std::unique_ptr<logger> rotating_file_logger(
+    const std::string &filename,
+    const std::string &extension,
+    const std::size_t max_size,
+    const std::size_t max_files,
+    const std::size_t flush_every,
+    const std::string& logger_name = "")
+{
+    auto fsink = std::make_shared<sinks::rotating_file_sink_st>(filename, extension, max_size, max_files, flush_every);
+    return std::unique_ptr<logger>(new c11log::logger(logger_name, fsink));
+}
+
+std::unique_ptr<logger> rotating_file_logger_mt(
+    const std::string &filename,
+    const std::string &extension,
+    const std::size_t max_size,
+    const std::size_t max_files,
+    const std::size_t flush_every,
+    const std::string& logger_name = "")
+{
+    auto fsink = std::make_shared<sinks::rotating_file_sink_mt>(filename, extension, max_size, max_files, flush_every);
+    return std::unique_ptr<logger>(new c11log::logger(logger_name, fsink));
+}
+} // ns factory
+} // ns c11log
diff --git a/include/c11log/logger.h b/include/c11log/logger.h
index 288e82aa..40b0b333 100644
--- a/include/c11log/logger.h
+++ b/include/c11log/logger.h
@@ -32,10 +32,13 @@ public:
     using formatter_ptr = std::unique_ptr<formatters::formatter>;
 
     logger(const std::string& name, sinks_init_list, formatter_ptr = nullptr);
+    template<class It>
+    logger(const std::string& name, It begin, It end, formatter_ptr = nullptr);
     logger(const std::string& name, sink_ptr, formatter_ptr = nullptr);
+    ~logger() = default;
+
     logger(const logger&) = delete;
     logger& operator=(const logger&) = delete;
-    ~logger() = default;
 
     void level(level::level_enum);
     level::level_enum level() const;
@@ -43,21 +46,25 @@ public:
     const std::string& name() const;
     bool should_log(level::level_enum) const;
 
+    template <typename... Args> details::line_logger log(level::level_enum lvl, const Args&... args);
+
     template<typename T> details::line_logger trace(const T&);
     template<typename T> details::line_logger debug(const T&);
-    template<typename T> details::line_logger info(const T&);
+    template <typename... Args> details::line_logger info(const Args&... args);
+
     template<typename T> details::line_logger warn(const T&);
     template<typename T> details::line_logger error(const T&);
     template<typename T> details::line_logger critical(const T&);
-    template<typename T> details::line_logger fatal(const T&);
 
     details::line_logger trace();
     details::line_logger debug();
-    details::line_logger info();
     details::line_logger warn();
-    details::line_logger error();
+    details::line_logger& error();
     details::line_logger critical();
-    details::line_logger fatal();
+
+
+
+
 
 private:
     friend details::line_logger;
@@ -66,31 +73,35 @@ private:
     sinks_vector_t _sinks;
     std::atomic_int _level;
 
-    void _log_it(details::log_msg& msg);
+    void _variadic_log(details::line_logger& l);
+    template <typename First, typename... Rest>
+    void _variadic_log(details::line_logger&l, const First& first, const Rest&... rest);
+    void _log_msg(details::log_msg& msg);
+
+
 };
-
-
-//std::shared_ptr<c11log::logger> create_logger(const std::string& name, logger::sinks_init_list sinks, logger::formatter_ptr formatter = nullptr);
-//std::shared_ptr<logger> get_logger(const std::string& name);
-
 }
 
+//
+// trace & debug macros
+//
+#ifdef FFLOG_ENABLE_TRACE
+#define FFLOG_TRACE(logger, ...) logger->log(c11log::level::TRACE, __FILE__, " #", __LINE__,": " __VA_ARGS__)
+#else
+#define FFLOG_TRACE(logger, ...) {}
+#endif
+
+#ifdef FFLOG_ENABLE_DEBUG
+#define FFLOG_DEBUG(logger, ...) logger->log(c11log::level::DEBUG, __VA_ARGS__)
+#else
+#define FFLOG_DEBUG(logger, ...) {}
+#endif
+
 //
 // Logger implementation
 //
 
 #include "details/line_logger.h"
-#include "details/factory.h"
-
-/*
-inline std::shared_ptr<c11log::logger> c11log::create_logger(const std::string& name, logger::sinks_init_list sinks, logger::formatter_ptr formatter)
-{
-    return details::factory::instance().create_logger(name, sinks, std::move(formatter));
-}
-inline std::shared_ptr<c11log::logger> c11log::get_logger(const std::string& name)
-{
-    return details::factory::instance().get_logger(name);
-}*/
 
 
 inline c11log::logger::logger(const std::string& name, sinks_init_list sinks_list, formatter_ptr f) :
@@ -105,6 +116,15 @@ inline c11log::logger::logger(const std::string& name, sinks_init_list sinks_lis
 
 }
 
+template<class It>
+inline c11log::logger::logger(const std::string& name, It begin, It end, formatter_ptr f):
+    _name(name),
+    _formatter(std::move(f)),
+    _sinks(begin, end)
+{
+
+}
+
 
 inline c11log::logger::logger(const std::string& name, sink_ptr sink, formatter_ptr f) :
     logger(name, {sink}, std::move(f)) {}
@@ -121,19 +141,26 @@ inline c11log::details::line_logger c11log::logger::trace(const T& msg)
 template<typename T>
 inline c11log::details::line_logger c11log::logger::debug(const T& msg)
 {
-    details::line_logger l(this, level::DEBUG, should_log(level::DEBUG));
+    c11log::details::line_logger l(this, level::DEBUG, should_log(level::DEBUG));
     l.write(msg);
     return l;
 }
 
-template<typename T>
-inline c11log::details::line_logger c11log::logger::info(const T& msg)
-{
-    details::line_logger l(this, level::INFO, should_log(level::INFO));
-    l.write(msg);
+template <typename... Args>
+inline c11log::details::line_logger c11log::logger::log(level::level_enum lvl, const Args&... args) {
+    details::line_logger l(this, lvl, true);
+    _variadic_log(l, args...);
     return l;
 }
 
+template <typename... Args>
+inline c11log::details::line_logger c11log::logger::info(const Args&... args) {
+    details::line_logger l(this, level::INFO, should_log(level::INFO));
+    _variadic_log(l, args...);
+    return l;
+}
+
+
 template<typename T>
 inline c11log::details::line_logger c11log::logger::warn(const T& msg)
 {
@@ -150,13 +177,7 @@ inline c11log::details::line_logger c11log::logger::critical(const T& msg)
     return l;
 }
 
-template<typename T>
-inline c11log::details::line_logger c11log::logger::fatal(const T& msg)
-{
-    details::line_logger l(this, level::FATAL, should_log(level::FATAL));
-    l.write(msg);
-    return l;
-}
+
 
 
 inline c11log::details::line_logger c11log::logger::trace()
@@ -169,10 +190,6 @@ inline c11log::details::line_logger c11log::logger::debug()
     return details::line_logger(this, level::DEBUG, should_log(level::DEBUG));
 }
 
-inline c11log::details::line_logger c11log::logger::info()
-{
-    return details::line_logger(this, level::INFO, should_log(level::INFO));
-}
 
 inline c11log::details::line_logger c11log::logger::warn()
 {
@@ -184,11 +201,6 @@ inline c11log::details::line_logger c11log::logger::critical()
     return details::line_logger(this, level::CRITICAL, should_log(level::CRITICAL));
 }
 
-inline c11log::details::line_logger c11log::logger::fatal()
-{
-    return details::line_logger(this, level::FATAL, should_log(level::FATAL));
-}
-
 
 inline const std::string& c11log::logger::name() const
 {
@@ -210,7 +222,17 @@ inline bool c11log::logger::should_log(c11log::level::level_enum level) const
     return level >= _level.load();
 }
 
-inline void c11log::logger::_log_it(details::log_msg& msg)
+
+inline void c11log::logger::_variadic_log(c11log::details::line_logger& l) {}
+
+template <typename First, typename... Rest>
+void c11log::logger::_variadic_log(c11log::details::line_logger& l, const First& first, const Rest&... rest)
+{
+    l.write(first);
+    _variadic_log(l, rest...);
+}
+
+inline void c11log::logger::_log_msg(details::log_msg& msg)
 {
     _formatter->format(msg);
     for (auto &sink : _sinks)
diff --git a/include/c11log/sinks/stdout_sinks.h b/include/c11log/sinks/stdout_sinks.h
index cdb262cd..8ab13255 100644
--- a/include/c11log/sinks/stdout_sinks.h
+++ b/include/c11log/sinks/stdout_sinks.h
@@ -17,8 +17,9 @@ public:
     stdout_sink() : ostream_sink<Mutex>(std::cout) {}
 };
 
-typedef stdout_sink<std::mutex> stdout_sink_mt;
 typedef stdout_sink<details::null_mutex> stdout_sink_st;
+typedef stdout_sink<std::mutex> stdout_sink_mt;
+
 
 template <class Mutex>
 class stderr_sink : public ostream_sink<Mutex>