// Copyright (c) 2007-2010 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:

// Base class for trace core handlers.

//

#ifndef __TRACECOREHANDLER_H__

#define __TRACECOREHANDLER_H__

// Include files

#include <kernel/kernel.h>

// Forward declarations

class DTraceCoreSettings;

class DTraceCoreWriter;

/**

 * Base class for trace core handlers. A handler receives trace data and delegates it to writer

 */

NONSHARABLE_CLASS( DTraceCoreHandler ) : public DBase

    {

public:

    /**

     * Constructor

     */

    DTraceCoreHandler();

    /**

     * Destructor

     */

    ~DTraceCoreHandler();

    /**

     * Registers this handler to trace core.

     */

    TInt Register();

    /**

     * Called before SetWriter with interrupts enabled

     *

     * @param aWriter The new writer

     */

    virtual void PrepareSetWriter( DTraceCoreWriter* aWriter );

    /**

     * Sets the active writer. This is called with interrupts disabled

     *

     * @param aWriter The new writer

     */

    virtual void SetWriter( DTraceCoreWriter* aWriter );

	/**

     * Sets the settings (saver). Called by trace core

     *

     * @param aSettings The new settings

     */

    virtual void SetSettings( DTraceCoreSettings* aSettings );

private:

    /**

     * Unregisters this handler from trace core. Called from destructor

     */

    void Unregister();

protected:

    /**

     * Writer interface

     */

 	DTraceCoreWriter* iWriter;

 	/**

     * Settings interface

     */

 	DTraceCoreSettings* iSettings;

};

#endif

// End of File