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diff --git a/src/activity_manager.hpp b/src/activity_manager.hpp
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+/*
+ * Copyright (c) 2018 Panasonic Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef ACTIVITY_MANAGER_HPP
+#define ACTIVITY_MANAGER_HPP
+
+#include <bitset>
+
+extern "C"
+{
+#include <afb/afb-binding.h>
+}
+
+namespace lcm
+{
+
+#define LCM_EVENT_STATUS_CHANGED "statusChanged"
+#define LCM_API_GET_ACTIVITY_STATUS "getActivityStatus"
+#define LCM_API    "api"
+#define LCM_TARGET "target"
+#define LCM_STATE  "state"
+
+enum activity_status
+{
+  NOTEXISTS,
+
+  CREATED,  // after ON_CREATE
+  DESTROYED,// after ON_DESTROY
+
+  STARTED,  // after ON_START, ON_RESTART
+  STOPPED,  // after ON_STOP
+
+  FOREGROUND,  // after ON_FOREGROUND
+  BACKGROUND,  // after ON_BACKGROUND
+
+  NUM_STATUS,
+};
+
+#define ACTIVITY_FILTER_ALL_SET "111111"  // For demo, always notify all states
+
+struct _observer_context {
+  afb_event_t event;  // onStatusChanged
+  std::bitset<NUM_STATUS> filter; // not supported yet
+};
+
+using observer = struct _observer_context;
+
+// map of <"id:appid", "context of observer">
+using observers = std::map<std::string, observer>;
+
+class ActivityManager
+{
+ public:
+  explicit ActivityManager();
+  ~ActivityManager() = default;
+
+  void api_register_activity_observer (afb_req_t req);
+  void api_unregister_activity_observer (afb_req_t req);
+  wm::result<json_object *> api_get_activity_status(const char *appid);
+
+ public:
+  void emit_activity_status_changed(const char* appid, const char* state);
+
+  // map of <"id:target", "registered observers">
+  std::map<std::string, observers> map_observers;
+  // map of <"id:target", "current_state">
+  std::map<std::string, int> states;
+
+  const char *states_s[NUM_STATUS];
+};
+
+} // namespace lcm
+#endif /* ACTIVITY_MANAGER_HPP */