--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/natfw/natfwturnplugin/inc/cturnasynccallback.h	Tue Feb 02 01:04:58 2010 +0200
@@ -0,0 +1,156 @@
+/*
+* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:    
+*
+*/
+
+
+
+
+#ifndef C_TURNASYNCCALLBACK_H
+#define C_TURNASYNCCALLBACK_H
+
+// INCLUDES
+#include <e32base.h>
+#include "tturnplugincallbackinfo.h"
+
+// FORWARD DECLARATIONS
+class MNATFWPluginObserver;
+
+
+// CLASS DECLARATION
+/**
+ * CTurnAsyncCallback is an active object used to guarantee that when the
+ * function calls to the MNATFWPluginObserver are made, the upper layer
+ * can delete any TURN Plug-in related object it owns.
+ */
+class CTurnAsyncCallback : public CActive
+    {
+
+    friend class UT_CNATFWTurnConnectionHandler;
+
+public: // Constructor and destructor
+
+    /**
+     * Two-phased constructor.
+     * @param aTurnPlugin The TURN Plug-in instance
+     * @param aObserver Observer implementing the callback functions
+     */
+    static CTurnAsyncCallback* NewL(
+        const CNATFWPluginApi& aTurnPlugin,
+        MNATFWPluginObserver& aObserver );
+
+    /**
+     * Frees the resources of CTurnAsyncCallback. Any issued callback
+     * request that have not yet been executed, are discarded.
+     *
+     * @since   S60 3.2
+     */
+    ~CTurnAsyncCallback();
+
+public: // New functions
+
+    /**
+     * Orders a specified callback function to be called, and provides all
+     * necessary parameters.
+     *
+     * @since   S60 3.2
+     * @param   aFunction Identifies the function of MNATFWPluginObserver
+     *          to use
+     * @param   aStreamId   Stream ID
+     * @param   aErrorCode  Error reason
+     * @param   aEventData  Event data
+     */
+    void MakeCallbackL( TTurnPluginCallbackInfo::TFunction aFunction,
+                        TUint aStreamId,
+                        TInt aErrorCode,
+                        TAny* aEventData );
+
+    /**
+     * Removes all pending callbacks, which have the specified stream ID
+     * as a parameter.
+     *
+     * @since   S60 3.2
+     * @param   aStreamId   Stream ID
+     */
+    void CancelCallback( TUint aStreamId );
+
+protected: // From CActive
+
+    /**
+     * from CActive
+     */
+    void DoCancel();
+
+    /**
+     * from CActive
+     */
+    void RunL();
+
+    /**
+     * from CActive
+     */
+    TInt RunError( TInt aError );
+
+private: // Constructors
+
+    CTurnAsyncCallback();
+
+    CTurnAsyncCallback( const CNATFWPluginApi& aTurnPlugin,
+        MNATFWPluginObserver& aObserver );
+
+    CTurnAsyncCallback( const CTurnAsyncCallback& aAsyncCallback );
+
+private: // New functions, for internal use
+
+    /**
+     * Starts waiting for MakeCallbackL events.
+     *
+     * @since   S60 3.2
+     */
+    void WaitForRequestsL();
+
+    /**
+     * Wakes system up.
+     *
+     * @since   S60 3.2
+     */
+    void Wakeup();
+
+    /**
+     * Calls the oldest callback entry, if any.
+     *
+     * @since   S60 3.2
+     */
+    void ExecuteFirstCallback();
+
+private: // Data
+
+    /**
+     * TURN Plug-in instance
+     */
+    const CNATFWPluginApi& iTurnPlugin;
+
+    /**
+     * Implements the callback functions
+     */
+    MNATFWPluginObserver& iObserver;
+
+    /**
+     * Callback requests that have not yet been executed
+     */
+    TSglQue<TTurnPluginCallbackInfo> iPendingCallbacks;
+    };
+
+#endif // C_TURNASYNCCALLBACK_H