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diff --git a/src/include/download-provider-event.h b/src/include/download-provider-event.h
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+++ b/src/include/download-provider-event.h
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+/*
+ * Copyright 2012  Samsung Electronics Co., Ltd
+ *
+ * Licensed under the Flora License, Version 1.0 (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.tizenopensource.org/license
+ *
+ * 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.
+ */
+
+/**
+ * @file 	download-provider-event.h
+ * @author	Jungki Kwak (jungki.kwak@samsung.com)
+ * @brief	Download event class
+ */
+#ifndef DOWNLOAD_PROVIDER_EVENT_H
+#define DOWNLOAD_PROVIDER_EVENT_H
+
+#include <vector>
+/* For debug */
+#include <string>
+
+using namespace std;
+
+class Observer;
+class Subject
+{
+public:
+	Subject(){}
+	~Subject(){}
+
+	void attach(Observer *);
+	void detach(Observer *);
+	void notify(void);
+
+private:
+	vector<Observer*> _observers;
+};
+
+typedef void (*updateFunction)(void *data);
+
+class Observer
+{
+public:
+	/* For debug */
+	Observer(updateFunction uf, void *data, const char *name);
+	//Observer(updateFunction uf, void *data);
+	~Observer(){}
+
+	void update(Subject *s);
+	void set(updateFunction uf, void *data);
+	void clear(void);
+	void *getUserData(void) { return m_userData; }
+	/* For debug */
+	string name(void) { return observerName; }
+
+private:
+	void call(void);
+
+	updateFunction m_updateFunction;
+	void *m_userData;
+	/* For debug */
+	string observerName;
+};
+
+#endif /* DOWNLOAD_PROVIDER_EVENT_H */