improve log module; get rid of global mutex object

Author: kolomenkin

Logger.cpp

@@ -6,13 +6,19 @@
 #include <string_view>
 
 
-std::mutex Logger::s_protect;
+Logger::LogLevel Logger::m_minLogLevel = Logger::LogLevel::Debug;
+
 
 
 void Logger::log(const std::string& message, const LogLevel logLevel)
 {
     using namespace std::literals;
 
+    if (logLevel < m_minLogLevel)
+    {
+        return;
+    }
+
     std::string_view strLogLevel = "UNKNOWN"sv;
     switch (logLevel)
     {
@@ -46,7 +52,8 @@ void Logger::log(const std::string& message, const LogLevel logLevel)
     gmtime_r(&tNow, &tmNow);
 #endif
 
-    std::lock_guard lock(s_protect);
+    static std::mutex protect;
+    std::lock_guard lock(protect);
 
     stream
         << std::put_time(&tmNow, "%Y-%m-%d %H:%M:%S") << '.' << std::setw(3) << std::setfill('0') << std::right << milliseconds

Logger.h

@@ -21,8 +21,18 @@ class Logger
 
     static void log(const std::string& message, const LogLevel logLevel);
 
+    static LogLevel GetLogLevel(const LogLevel level)
+    {
+        return m_minLogLevel;
+    }
+
+    static void SetLogLevel(const LogLevel level)
+    {
+        m_minLogLevel = level;
+    }
+
 protected:
-    static std::mutex s_protect;
+    static LogLevel m_minLogLevel;
 };
 
 class LogStream
@@ -89,5 +99,6 @@ class LogStream
 };
 
 
+#define LOG_DEBUG  LogStream(Logger::LogLevel::Debug)
 #define LOG_INFO  LogStream(Logger::LogLevel::Info)
 #define LOG_ERROR LogStream(Logger::LogLevel::Error)

main.cpp

@@ -12,6 +12,9 @@
 
 int main(const int argc, const char* const* const argv)
 {
+    const Logger::LogLevel logLevel = Logger::LogLevel::Debug;
+    Logger::SetLogLevel(logLevel);
+
     LOG_INFO << "main: begin" << std::endl;
     const std::string arg1 = argc > 1 ? argv[1] : "";