monolish_logger.hpp

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#pragma once
#include <chrono>
#include <fstream>
#include <iostream>
#include <omp.h>
#include <string>
#include <vector>
 
#define monolish_func __FUNCTION__
 
#if defined USE_MPI
#include <mpi.h>
#endif
 
namespace monolish {
class Logger {
private:
  Logger() = default;
 
  ~Logger() {
    if (pStream != &std::cout) {
      delete pStream;
    }
  };
 
  std::vector<std::string> calls;
  std::vector<std::chrono::system_clock::time_point> times;
  std::string filename;
  std::ostream *pStream;
 
public:
  size_t LogLevel = 0;
 
  Logger(const Logger &) = delete;
  Logger &operator=(const Logger &) = delete;
  Logger(Logger &&) = delete;
  Logger &operator=(Logger &&) = delete;
 
  static Logger &get_instance() {
    static Logger instance;
    return instance;
  }
 
  void set_log_level(size_t L) {
    if (3 < L) { // loglevel = {0, 1, 2, 3}
      throw std::runtime_error("error bad LogLevel");
    }
    LogLevel = L;
  }
 
  void set_log_filename(const std::string file) {
    filename = file;
 
    // file open
    pStream = new std::ofstream(filename);
    if (pStream->fail()) {
      delete pStream;
      pStream = &std::cout;
    }
  }
 
  // for solver (large func.)
  void solver_in(const std::string func_name);
  void solver_out();
 
  // for blas (small func.)
  void func_in(const std::string func_name);
  void func_out();
 
  // for utils (very small func.)
  void util_in(const std::string func_name);
  void util_out();
};
} // namespace monolish