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diff --git a/src/event/EventSystem.h b/src/event/EventSystem.h
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+/****************************************************************************
+**
+** Copyright (C) 2016 NVIDIA Corporation.
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt 3D Studio.
+**
+** $QT_BEGIN_LICENSE:GPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 or (at your option) any later version
+** approved by the KDE Free Qt Foundation. The licenses are as published by
+** the Free Software Foundation and appearing in the file LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef MESSAGE_SYSTEM_H
+#define MESSAGE_SYSTEM_H
+#include <cstdlib>
+#include "EventSystemC.h"
+
+namespace qt3ds {
+namespace evt {
+
+    typedef Qt3DSEventSystemStr TEventStr;
+
+    // Factory from the provider's perspective.
+    class IEventFactory
+    {
+    protected:
+        virtual ~IEventFactory() {}
+    public:
+        virtual Qt3DSEventSystemEvent &CreateEvent(int numData) = 0;
+        // Guaranteed to be at least 4K - sizeof(Qt3DSEventSystemEvent)
+        virtual size_t GetMaxNumEventData() = 0;
+        // Guaranteed to be at least 4K
+        virtual size_t GetMaxStrLength() = 0;
+
+        virtual Qt3DSEventSystemRegisteredStr RegisterStr(TEventStr inSrc) = 0;
+        // Null terminates if strlen(inSrc) > getMaxStrLength
+        virtual TEventStr AllocateStr(TEventStr inSrc) = 0;
+        // Returns null if inLength > getMaxStrLength
+        virtual TEventStr AllocateStr(int inLength) = 0;
+    };
+
+    class IEventProvider
+    {
+    protected:
+        virtual ~IEventProvider() {}
+    public:
+        // Return the next N events, placed into the event buffer.
+        virtual size_t GetNextEvents(IEventFactory &inFactory, Qt3DSEventSystemEvent **outBuffer,
+                                     size_t bufLen) = 0;
+        virtual void Release() = 0;
+    };
+}
+}
+
+#endif