/*

* Copyright (c) 2006-2007 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:  Monitors for signal change in RComm local media side

*

*/

#ifndef C_CDUNSIGNALWAITER_H

#define C_CDUNSIGNALWAITER_H

#include "DunChanMan.h"

/**

 *  Class to monitor for signal change in RComm local media side

 *  This class is needed to avoid unnecessary resource allocation of Dataport

 *  side when number of supported Dataport ports for DUN is less than the

 *  number of local media side plugins that use RComm

 *

 *  @lib dunutils.lib

 *  @since S60 v3.2

 */

NONSHARABLE_CLASS( CDunSignalWaiter ) : public CActive

    {

public:

    /**

     * Two-phased constructor.

     * @param aChannelCallback Callback to call when notification via

     *                         MDunChannelAllocator to be made

     * @return Instance of self

     */

	static CDunSignalWaiter* NewL( MDunChannelAllocator* aChannelCallback );

    /**

    * Destructor.

    */

    virtual ~CDunSignalWaiter();

    /**

     * Resets data to initial values

     *

     * @since S60 3.2

     * @return None

     */

    void ResetData();

    /**

     * Adds callback for RunL error controlling

     * The callback will be called when error is detected in asynchronous

     * operation

     *

     * @since S60 3.2

     * @param aCallback Callback to call when line status changes

     * @return Symbian error code on error, KErrNone otherwise

     */

    TInt AddCallback( MDunConnMon* aCallback );

    /**

     * Sets media to use for this endpoint

     *

     * @since S60 3.2

     * @param aComm RComm pointer to use as the endpoint

     * @return Symbian error code on error, KErrNone otherwise

     */

    TInt SetMedia( RComm* aComm );

    /**

    * Issues request to start waiting for new data in RComm

    *

    * @since S60 3.2

    * @return Symbian error code on error, KErrNone otherwise

    */

    TInt IssueRequest();

    /**

     * Stops monitoring for new data

     *

     * @since S60 3.2

     * @return Symbian error code on error, KErrNone otherwise

     */

    TInt Stop();

private:

    CDunSignalWaiter( MDunChannelAllocator* aChannelCallback );

    void ConstructL();

    /**

     * Initializes this class

     *

     * @since S60 3.2

     * @return None

     */

    void Initialize();

// from base class CActive

    /**

     * From CActive.

     * Gets called when new data in RComm object

     *

     * @since S60 3.2

     * @return None

     */

    void RunL();

    /**

     * From CActive.

     * Gets called on cancel

     *

     * @since S60 3.2

     * @return None

     */

    void DoCancel();

private:  // data

    /**

     * Callback(s) to call when notification(s) via MDunConnMon to be made

     * Normally contains only one callback

     */

    RPointerArray<MDunConnMon> iCallbacks;

    /**

     * Callback to call when notification via MDunChannelAllocator to be made

     * Not own.

     */

    MDunChannelAllocator* iChannelCallback;

    /**

     * Current state of data monitoring: active or inactive

     */

    TDunState iSignalWaiterState;

    /**

     * Signals set when RComm::NotifySignalChange() request completes

     */

    TUint iSignals;

    /**

     * RComm object of local media side

     * Not own.

     */

    RComm* iComm;

    };

#endif  // C_CDUNSIGNALWAITER_H