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+/*
+ * Copyright (c) 2018, Ford Motor Company
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * Neither the name of the Ford Motor Company nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef SRC_COMPONENTS_APPLICATION_MANAGER_INCLUDE_APPLICATION_MANAGER_SYSTEM_TIME_SYSTEM_TIME_HANDLER_IMPL_H_
+#define SRC_COMPONENTS_APPLICATION_MANAGER_INCLUDE_APPLICATION_MANAGER_SYSTEM_TIME_SYSTEM_TIME_HANDLER_IMPL_H_
+
+#include <time.h>
+#include <vector>
+
+#include "utils/lock.h"
+#include "utils/macro.h"
+#include "utils/system_time_handler.h"
+#include "application_manager/application_manager_impl.h"
+#include "application_manager/event_engine/event_observer.h"
+
+namespace application_manager {
+
+/**
+ * @brief The SystemTimeHandlerImpl class.
+ * Responsible for the system time notification. It keeps the list
+ * of system time listeners, sends appropriate request to the system
+ * and notifies the listeners with new time right after response has appeared.
+ */
+class SystemTimeHandlerImpl : public utils::SystemTimeHandler,
+                              public event_engine::EventObserver {
+ public:
+  /**
+   * @brief SystemTimeHandlerImpl creates the instance of the class.
+   */
+  explicit SystemTimeHandlerImpl(ApplicationManager& application_manager);
+
+  /**
+   * @brief ~SystemTimeHandlerImpl
+   */
+  ~SystemTimeHandlerImpl();
+
+ private:
+  /**
+   * @brief on_event allows to process certain events from the system.
+   * Event which are handles within this methods  are: OnSystemTimeReady
+   * in order to send system time query and GetSystemTimeResponse in order
+   * to retrieve utc time and notify all the listeners with new time value.
+   */
+  void on_event(const application_manager::event_engine::Event& event) FINAL;
+
+  /**
+   * @brief DoSystemTimeQuery sends the appropriate request to the system
+   * and subscribes the class to the response. This is asynchronous request
+   * thus it won't block until the system respond and returns immediately.
+   */
+  void DoSystemTimeQuery() FINAL;
+
+  /**
+   * @brief DoSubscribe allows to subscribe certain listener for
+   * SystemTime. This certain implementation does not maintain
+   * listeners collection instead it save the pointer to listener.
+   * @note the class is not reponsible for the pointer's lifecycle.
+   * So consider to explicitly unsibsscribe from event when listener
+   * is going to be destroyed.
+   * @param listener the listener which will be notified
+   * in case of SystemTime appeared.
+   */
+  void DoSubscribe(utils::SystemTimeListener* listener) FINAL;
+
+  /**
+   * @brief DoUnsubscribe assigns the pointer to listener to NULL.
+   * This certain implementation ignores passed parameter.
+   * @param listener pointer to the object which should be
+   * unsubscribed from events.
+   */
+  void DoUnsubscribe(utils::SystemTimeListener* listener) FINAL;
+
+  /**
+   * @brief FetchSystemTime this method allows to obtain
+   * recently received utc time.
+   * @note it is up to user to check whether the returned
+   * argument is valid
+   * @return the time value returned by system.
+   */
+  time_t FetchSystemTime() FINAL;
+
+  /**
+   * @brief SendTimeRequest sends the request to the system
+   * and subscribes for response.
+   */
+  void SendTimeRequest();
+
+  /**
+   * @brief ProcessSystemTimeResponse allows to process GetSystemTimeResponse
+   * @param event contains response parameters aka "systemTime".
+   */
+  void ProcessSystemTimeResponse(
+      const application_manager::event_engine::Event& event);
+
+  /**
+   * @brief ProcessSystemTimeReadyNotification allows to process
+   * OnSystemTimeready notification
+   * from HMI. It unsubscribes from the mentioned notification and sends
+   * GetSystemTimeRequest to HMI in order to obtain system time
+   */
+  void ProcessSystemTimeReadyNotification();
+
+  /**
+   * @brief Checks if UTC time is ready to provided by HMI
+   * and can be requested by GetSystemTime request
+   * @return True if HMI is ready to provide UTC time
+   * otherwise False
+   */
+  bool utc_time_can_be_received() const FINAL;
+
+  mutable sync_primitives::Lock state_lock_;
+  // Variable means HMI readiness to provide system time by request
+  volatile bool utc_time_can_be_received_;
+
+  /**
+   * @brief Flag used to control that only GetSystemTime request at time could
+   * be sent to HMI
+   */
+  volatile bool awaiting_get_system_time_;
+
+  // Varible used to store result for GetSystemTime request
+  time_t last_time_;
+
+  sync_primitives::Lock system_time_listener_lock_;
+  utils::SystemTimeListener* system_time_listener_;
+  ApplicationManager& app_manager_;
+};
+
+}  // namespace application_manager
+
+#endif  // SRC_COMPONENTS_APPLICATION_MANAGER_INCLUDE_APPLICATION_MANAGER_SYSTEM_TIME_SYSTEM_TIME_HANDLER_IMPL_H_