/*

* 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:    Executes client specified callbacks

*

*/

#ifndef C_CNCMCALLBACKEXECUTER_H

#define C_CNCMCALLBACKEXECUTER_H

#include <e32base.h>

#include "ncmconnectionmultiplexer.hrh"

/**

 *  Encapsulates callback function.

 *

 *  @lib icecandidatehandler.lib

 *  @since S60 v3.2

 */

class TNcmCallBack

    {

public:

    TNcmCallBack( void ( *aFunction )( CBase& aObjectRef, TUint aStreamId,

        TUint aConnectionId, TMultiplexerConnectionNotifyType aType,

        TInt aErrorCode ),

        CBase& aObjectRef, TUint aStreamId, TUint aConnectionId,

        TMultiplexerConnectionNotifyType aType, TInt aErrorCode )

        :

        iFunction( aFunction ),

        iObjectRef( aObjectRef ),

        iStreamId( aStreamId ),

        iConnectionId( aConnectionId ),

        iType( aType ),

        iErrorCode( aErrorCode )

        { };

    /**

     * Calls encapsulated callback function with client specified parameters.

     *

     * @since   S60 v3.2

     * return   void

     */

    void CallBack() const

        { 

        if ( iFunction )

            {

            (*iFunction)( iObjectRef, iStreamId, iConnectionId, iType,

                    iErrorCode );

            }

        }

private:

    TNcmCallBack();

public:

    /**

     * A pointer to the callback function.

     */

    void ( *iFunction )( CBase& aObjectRef, TUint aStreamId,

        TUint aConnectionId, TMultiplexerConnectionNotifyType aType,

        TInt aErrorCode );

    /**

     * A pointer that is passed to the callback function when

     * the function is called.

     */

    CBase& iObjectRef;

    /**

     * A stream ID that is passed to the callback function when

     * the function is called.

     */

    TUint iStreamId;

    /**

     * A connection ID that is passed to the callback function when

     * the function is called.

     */

    TUint iConnectionId;

    /**

     * A connection notify type that is passed to the callback function when

     * the function is called.

     */    

    TMultiplexerConnectionNotifyType iType;

    /**

     * A error code that is passed to the callback function when

     * the function is called.     

     */    

    TInt iErrorCode;        

    };

/**

 *  Executes client specified callbacks.

 *

 *  @lib connectionmux.lib

 *  @since S60 v3.2

 */

NONSHARABLE_CLASS( CNcmCallBackExecuter ) : public CActive

    {

public:

    /**

     * Two-phased constructor.

     */

    static CNcmCallBackExecuter* NewL();

    /**

     * Two-phased constructor.

     */

    static CNcmCallBackExecuter* NewLC();

    /**

     * Destructor.

     */

    virtual ~CNcmCallBackExecuter();

    /**

     * Adds specified callback to the queue. Starts executing callbacks

     * if queue was empty.

     *

     * @since   S60 v3.2

     * @param   aCallBack       The callback to add to the queue

     * return   void

     */

    void AddCallBackL( const TNcmCallBack& aCallBack );

protected:

    void RunL();

    void DoCancel();

private:

    CNcmCallBackExecuter();

    void ConstructL();

    void ExecuteFirstCallback();

    void WaitForRequestsL();

    void Wakeup();

private: // data

    /**

     * Callback queue.

     */

    RArray<TNcmCallBack> iCallBacks;

    };

#endif // C_CNCMCALLBACKEXECUTER_H