1 /*

     2 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:  The base class for listening to events in Publish & Subscribe or in

    15 * 				Central Repository

    16 *

    17 */

    18 

    19 

    20 

    21 #ifndef CPROENGOBSERVERBASE_H

    22 #define CPROENGOBSERVERBASE_H

    23 

    24 // INCLUDES

    25 #include <e32base.h>

    26 

    27 // CLASS DECLARATION

    28 

    29 /**

    30 * The base class for listening to events in Publish & Subscribe or in

    31 * Central Repository. This is a helper class for CProEngNotifyHandlerImpl.

    32 *

    33 *  @lib ProfileEngine.lib

    34 *  @since 3.1

    35 */

    36 NONSHARABLE_CLASS( CProEngObserverBase ) : public CActive

    37     {

    38     protected:  // constructor and destructor

    39 

    40         CProEngObserverBase( TUint32 aKey );

    41 

    42         virtual ~CProEngObserverBase() {};

    43 

    44     public: // New functions:

    45 

    46         /**

    47          * Absract method to request notifications from the source determined

    48          * by the subclass. This must be called once after the real observer

    49          * class is constructed. After that this is called by RunL() of this

    50          * class.

    51          * @return KErrNone if succeed, otherwise a system-wide error code.

    52          */

    53         virtual TInt RequestNotification() = 0;

    54 

    55         /**

    56          * Abstract method to send notification to the observer.

    57          */

    58         virtual void NotifyObserverL() = 0;

    59 

    60         /**

    61          * Abstract method to send notification about the given error to the

    62          * observer.

    63          * @param aError the error code to be delivered to the observer.

    64          */

    65         virtual void NotifyError( TInt aError ) = 0;

    66 

    67     private: // Functions from base classes

    68 

    69         /**

    70          * From CActive.

    71          */

    72         void RunL();

    73 

    74     protected: // Data:

    75 

    76         // The key to observe

    77         TUint32 iKey;

    78 

    79     };

    80 

    81 #endif      //  CPROENGOBSERVERBASE_H

    82 

    83 // End of File

    84