add StopWatch class

Utils/CMakeLists.txt

@@ -1,7 +1,7 @@
 # CMakeList.txt : CMake project for OdbDesignServer
 #
 
-add_library(Utils SHARED "utils_export.h"   "ExitCode.h" "ThreadSafeQueue.h" "WorkQueueLoopThread.h" "Logger.h" "Logger.cpp" "CommandLineArgs.h" "CommandLineArgs.cpp" "bin2ascii.h" "ArchiveExtractor.cpp" "ArchiveExtractor.h" "libarchive_extract.cpp" "libarchive_extract.h" "str_trim.cpp" "str_trim.h"  "IJsonable.h" "IJsonable.cpp" "CrowReturnable.h" "JsonCrowReturnable.h" "timestamp.h" "timestamp.cpp")
+add_library(Utils SHARED "utils_export.h"   "ExitCode.h" "ThreadSafeQueue.h" "WorkQueueLoopThread.h" "Logger.h" "Logger.cpp" "CommandLineArgs.h" "CommandLineArgs.cpp" "bin2ascii.h" "ArchiveExtractor.cpp" "ArchiveExtractor.h" "libarchive_extract.cpp" "libarchive_extract.h" "str_trim.cpp" "str_trim.h"  "IJsonable.h" "IJsonable.cpp" "CrowReturnable.h" "JsonCrowReturnable.h" "timestamp.h" "timestamp.cpp" "StopWatch.h" "StopWatch.cpp")
 
 # state that anybody linking to us needs to include the current source dir,
 # while we don't.

Utils/StopWatch.cpp

@@ -0,0 +1,53 @@
+#include "StopWatch.h"
+#include <sstream>
+#include <iomanip>
+
+using namespace std::chrono;
+
+namespace Utils
+{	
+	StopWatch::StopWatch(bool start)
+		: m_stopped(false)
+	{
+		if (start)
+		{
+			this->start();
+		}
+	}
+
+	void StopWatch::start()
+	{
+		m_stopped = false;
+		m_started = system_clock::now();
+	}
+
+	void StopWatch::stop()
+	{		
+		m_finished = system_clock::now();
+		m_stopped = true;
+	}	
+
+	long long StopWatch::getElapsedMilliseconds() const
+	{		
+		return duration_cast<milliseconds>(getElapsedDuration()).count();		
+	}
+
+	double StopWatch::getElapsedSeconds() const
+	{
+		return getElapsedMilliseconds() / MS_PER_SECOND;
+	}
+
+	std::string StopWatch::getElapsedSecondsString(const std::string& suffix) const
+	{
+		std::stringstream ss;
+		ss  << std::fixed << std::setprecision(3) << getElapsedSeconds() << suffix;
+		return ss.str();
+	}	
+
+	system_clock::duration StopWatch::getElapsedDuration() const
+	{		
+		// if stop() hasn't been called yet, use the current time
+		if (m_stopped) return m_finished - m_started;
+		else return system_clock::now() - m_started;
+	}
+}

Utils/StopWatch.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <chrono>
+#include "utils_export.h"
+
+namespace Utils
+{
+	class UTILS_EXPORT StopWatch
+	{
+public:
+		StopWatch(bool start);		
+
+		void start();
+		void stop();
+
+		long long getElapsedMilliseconds() const;
+		double getElapsedSeconds() const;		
+		std::string getElapsedSecondsString(const std::string& suffix) const;
+		std::chrono::system_clock::duration getElapsedDuration() const;
+
+		//template<class D>
+		//std::chrono::system_clock::duration getElapsedDuration() const;	
+		// 
+
+		constexpr inline static const double MS_PER_SECOND = 1000.0;
+
+	private:
+		std::chrono::system_clock::time_point m_started;
+		std::chrono::system_clock::time_point m_finished;
+
+		bool m_stopped;
+
+	};
+}