diff --git a/src/util/logging.cpp b/src/util/logging.cpp
new file mode 100644
index 0000000..dd10c4d
--- /dev/null
+++ b/src/util/logging.cpp
@@ -0,0 +1,209 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2016 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ */
+
+#include "logging.hpp"
+#include "logger.hpp"
+
+#include <boost/log/expressions.hpp>
+#include <cstdlib>
+#include <fstream>
+
+namespace ndn {
+namespace util {
+
+static const LogLevel INITIAL_DEFAULT_LEVEL = LogLevel::NONE;
+
+Logging&
+Logging::get()
+{
+  // Initialization of block-scope variables with static storage duration is thread-safe.
+  // See ISO C++ standard [stmt.dcl]/4
+  static Logging instance;
+  return instance;
+}
+
+Logging::Logging()
+{
+  this->setDestinationImpl(shared_ptr<std::ostream>(&std::clog, bind([]{})));
+
+  const char* environ = std::getenv("NDN_CXX_LOG");
+  if (environ != nullptr) {
+    this->setLevelImpl(environ);
+  }
+}
+
+void
+Logging::addLoggerImpl(Logger& logger)
+{
+  std::lock_guard<std::mutex> lock(m_mutex);
+
+  const std::string& moduleName = logger.getModuleName();
+  m_loggers.insert({moduleName, &logger});
+
+  auto levelIt = m_enabledLevel.find(moduleName);
+  if (levelIt == m_enabledLevel.end()) {
+    levelIt = m_enabledLevel.find("*");
+  }
+  LogLevel level = levelIt == m_enabledLevel.end() ? INITIAL_DEFAULT_LEVEL : levelIt->second;
+  logger.setLevel(level);
+}
+
+#ifdef NDN_CXX_HAVE_TESTS
+bool
+Logging::removeLogger(Logger& logger)
+{
+  const std::string& moduleName = logger.getModuleName();
+  auto range = m_loggers.equal_range(moduleName);
+  for (auto i = range.first; i != range.second; ++i) {
+    if (i->second == &logger) {
+      m_loggers.erase(i);
+      return true;
+    }
+  }
+  return false;
+}
+#endif // NDN_CXX_HAVE_TESTS
+
+void
+Logging::setLevelImpl(const std::string& moduleName, LogLevel level)
+{
+  std::lock_guard<std::mutex> lock(m_mutex);
+
+  if (moduleName == "*") {
+    this->setDefaultLevel(level);
+    return;
+  }
+
+  m_enabledLevel[moduleName] = level;
+  auto range = m_loggers.equal_range(moduleName);
+  for (auto i = range.first; i != range.second; ++i) {
+    i->second->setLevel(level);
+  }
+}
+
+void
+Logging::setDefaultLevel(LogLevel level)
+{
+  m_enabledLevel.clear();
+  m_enabledLevel["*"] = level;
+
+  for (auto i = m_loggers.begin(); i != m_loggers.end(); ++i) {
+    i->second->setLevel(level);
+  }
+}
+
+void
+Logging::setLevelImpl(const std::string& config)
+{
+  std::stringstream ss(config);
+  std::string configModule;
+  while (std::getline(ss, configModule, ':')) {
+    size_t ind = configModule.find('=');
+    if (ind == std::string::npos) {
+      BOOST_THROW_EXCEPTION(std::invalid_argument("malformed logging config: '=' is missing"));
+    }
+
+    std::string moduleName = configModule.substr(0, ind);
+    LogLevel level = parseLogLevel(configModule.substr(ind+1));
+
+    this->setLevelImpl(moduleName, level);
+  }
+}
+
+#ifdef NDN_CXX_HAVE_TESTS
+std::string
+Logging::getLevels() const
+{
+  std::ostringstream os;
+
+  auto defaultLevelIt = m_enabledLevel.find("*");
+  if (defaultLevelIt != m_enabledLevel.end()) {
+    os << "*=" << defaultLevelIt->second << ':';
+  }
+
+  for (auto it = m_enabledLevel.begin(); it != m_enabledLevel.end(); ++it) {
+    if (it->first == "*") {
+      continue;
+    }
+    os << it->first << '=' << it->second << ':';
+  }
+
+  std::string s = os.str();
+  if (!s.empty()) {
+    s.pop_back(); // delete last ':'
+  }
+  return s;
+}
+#endif // NDN_CXX_HAVE_TESTS
+
+#ifdef NDN_CXX_HAVE_TESTS
+void
+Logging::resetLevels()
+{
+  this->setDefaultLevel(INITIAL_DEFAULT_LEVEL);
+  m_enabledLevel.clear();
+}
+#endif // NDN_CXX_HAVE_TESTS
+
+void
+Logging::setDestination(std::ostream& os)
+{
+  setDestination(shared_ptr<std::ostream>(&os, bind([]{})));
+}
+
+void
+Logging::setDestinationImpl(shared_ptr<std::ostream> os)
+{
+  std::lock_guard<std::mutex> lock(m_mutex);
+
+  m_destination = os;
+
+  auto backend = boost::make_shared<boost::log::sinks::text_ostream_backend>();
+  backend->auto_flush(true);
+  backend->add_stream(boost::shared_ptr<std::ostream>(os.get(), bind([]{})));
+
+  if (m_sink != nullptr) {
+    boost::log::core::get()->remove_sink(m_sink);
+    m_sink->flush();
+    m_sink.reset();
+  }
+
+  m_sink = boost::make_shared<Sink>(backend);
+  m_sink->set_formatter(boost::log::expressions::stream << boost::log::expressions::message);
+  boost::log::core::get()->add_sink(m_sink);
+}
+
+#ifdef NDN_CXX_HAVE_TESTS
+shared_ptr<std::ostream>
+Logging::getDestination()
+{
+  return m_destination;
+}
+#endif // NDN_CXX_HAVE_TESTS
+
+void
+Logging::flushImpl()
+{
+  m_sink->flush();
+}
+
+} // namespace util
+} // namespace ndn