#ifndef RTT_HPP_
#define RTT_HPP_
/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
// Name        : Rtt
// Author      : Avi
// Revision    : $Revision$ 
//
// Copyright 2009-2020 ECMWF.
// This software is licensed under the terms of the Apache Licence version 2.0 
// which can be obtained at http://www.apache.org/licenses/LICENSE-2.0. 
// In applying this licence, ECMWF does not waive the privileges and immunities 
// granted to it by virtue of its status as an intergovernmental organisation 
// nor does it submit to any jurisdiction. 
//
// Description : Simple client based singleton for recording round trip times
//               of all client based command
/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
#include <string>
#include <fstream>

#include <boost/lambda/lambda.hpp>

namespace ecf {

class Rtt {
public:
   Rtt(const Rtt&) = delete;
   const Rtt& operator=(const Rtt&) = delete;

   static void create(const std::string& filename);
   static void destroy();
   static Rtt* instance() { return instance_;}

   void log(const std::string& message);

   /// Open the file, and create average times for all client invoker round trip times
   static std::string analyis(const std::string& filename);

   /// Used in output and parsing, when computing averages
   static const char* tag() { return "rtt:";}

private:
   ~Rtt();
   explicit Rtt(const std::string& filename);
   static Rtt* instance_;
   mutable std::ofstream file_;
};

void rtt(const std::string& message);

// allow user to do the following:
// RTT("this is " << path << " ok ");
//
// helper, see STRINGIZE() macro
template <typename Functor>
std::string stringize_rtt(Functor const & f) {
   std::ostringstream out;
   f(out);
   return out.str();
}
#define STRINGIZE_RTT(EXPRESSION)  (ecf::stringize_rtt(boost::lambda::_1 << EXPRESSION))
#define RTT(EXPRESSION) ecf::rtt(STRINGIZE_RTT(EXPRESSION))
}
#endif
