Code modernization

Change-Id: Ia15bb9e988b08bc81c0709d95d7d17e6078a5385
diff --git a/src/logger.hpp b/src/logger.hpp
index 0ed35b3..71cfbc2 100644
--- a/src/logger.hpp
+++ b/src/logger.hpp
@@ -1,6 +1,6 @@
-/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
-/**
- * Copyright (C) 2014-2015  University of Arizona.
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2014-2019, Arizona Board of Regents.
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -33,21 +33,74 @@
 class Logger
 {
 public:
+  explicit
   Logger(const std::string& module)
     : m_module(module)
   {
   }
 
   void
-  shutdownLogger()
+  log(const std::string& logLine, bool printTime, bool printToConsole)
   {
-    if (m_logFile.is_open())
-      {
-        log("Terminating Logging Operations" , true, true);
-        m_logFile.close();
+    if (m_logLocation.length() > 0) {
+      if (printTime)
+        m_logFile << getTimestamp() << " - ";
+      m_logFile << logLine << std::endl;
+      m_logFile.flush();
+      if (printToConsole) {
+        if (printTime)
+          std::cout << getTimestamp() << " - ";
+        std::cout << logLine << std::endl;
       }
+    }
+    else {
+      if (printTime)
+        std::cout << getTimestamp() << " - ";
+      std::cout << logLine << std::endl;
+    }
   }
 
+  void
+  initializeLog(const std::string& instanceId)
+  {
+    m_logLocation = "";
+    const char* envVar = std::getenv("NDN_TRAFFIC_LOGFOLDER");
+    if (envVar != nullptr)
+      m_logLocation = envVar;
+
+    if (m_logLocation.empty()) {
+      std::cout << "Environment variable NDN_TRAFFIC_LOGFOLDER not set.\n"
+                << "Using default output for logging." << std::endl;
+      return;
+    }
+
+    if (boost::filesystem::exists(boost::filesystem::path(m_logLocation))) {
+      if (boost::filesystem::is_directory(boost::filesystem::path(m_logLocation))) {
+        std::string logFilename = m_logLocation + "/" + m_module + "_" + instanceId + ".log";
+        m_logFile.open(logFilename.data(), std::ofstream::out | std::ofstream::trunc);
+        if (m_logFile.is_open()) {
+          std::cout << "Log file initialized: " << logFilename << std::endl;
+        }
+        else {
+          std::cout << "ERROR: Unable to initialize a log file at: " << m_logLocation << std::endl
+                    << "Using default output for logging." << std::endl;
+          m_logLocation = "";
+        }
+      }
+      else {
+        std::cout << "NDN_TRAFFIC_LOGFOLDER should be a directory.\n"
+                  << "Using default output for logging." << std::endl;
+        m_logLocation = "";
+      }
+    }
+    else {
+      std::cout << "NDN_TRAFFIC_LOGFOLDER does not exist.\n"
+                << "Using default output for logging." << std::endl;
+      m_logLocation = "";
+    }
+  }
+
+private:
   static std::string
   getTimestamp()
   {
@@ -56,71 +109,6 @@
     return to_simple_string(now);
   }
 
-  void
-  log(const std::string& logLine, bool printTime, bool printToConsole)
-  {
-    if (m_logLocation.length() > 0)
-      {
-        if (printTime)
-          m_logFile << getTimestamp() << " - ";
-        m_logFile << logLine << std::endl;
-        m_logFile.flush();
-        if (printToConsole)
-          {
-            if (printTime)
-              std::cout << getTimestamp() << " - ";
-            std::cout << logLine << std::endl;
-          }
-      }
-    else
-      {
-        if (printTime)
-          std::cout << getTimestamp() << " - ";
-        std::cout << logLine << std::endl;
-      }
-  }
-
-  void
-  initializeLog(const std::string& instanceId)
-  {
-    const char* envVar = std::getenv("NDN_TRAFFIC_LOGFOLDER");
-    m_logLocation = "";
-    if (envVar != nullptr)
-      m_logLocation = envVar;
-
-    std::string logFilename;
-    if (boost::filesystem::exists(boost::filesystem::path(m_logLocation)))
-      {
-        if (boost::filesystem::is_directory(boost::filesystem::path(m_logLocation)))
-          {
-            logFilename = m_logLocation + "/" + m_module + "_" + instanceId + ".log";
-            m_logFile.open(logFilename.c_str(), std::ofstream::out | std::ofstream::trunc);
-            if (m_logFile.is_open())
-              std::cout << "Log File Initialized: " << logFilename << std::endl;
-            else
-              {
-                std::cout << "ERROR - Unable To Initialize A Log File At: "
-                          << m_logLocation << std::endl
-                          << "Using Default Output For Logging." << std::endl;
-                m_logLocation = "";
-              }
-          }
-        else
-          {
-            std::cout << "Environment Variable NDN_TRAFFIC_LOGFOLDER Should Be A Folder."
-                      << std::endl
-                      << "Using Default Output For Logging." << std::endl;
-            m_logLocation = "";
-          }
-      }
-    else
-      {
-        std::cout << "Environment Variable NDN_TRAFFIC_LOGFOLDER Not Set." << std::endl
-                  << "Using Default Output For Logging." << std::endl;
-        m_logLocation = "";
-      }
-  }
-
 private:
   std::string m_module;
   std::string m_logLocation;