codhandler/roapapp/inc/RequestCompleteCallback.h
author Kiiskinen Klaus (Nokia-D-MSW/Tampere) <klaus.kiiskinen@nokia.com>
Mon, 30 Mar 2009 12:54:55 +0300
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/*
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* Copyright (c) 2004 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description: 
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*      Declaration of class CRequestCompleteCallback.h   
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*      
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*
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*/
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#ifndef REQUEST_COMPLETE_CALLBACK_H
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#define REQUEST_COMPLETE_CALLBACK_H
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// INCLUDES
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#include <e32base.h>
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// CLASS DECLARATION
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/**
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* Active object to transfer a request completion to a callback.
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* NOTE: This object handles only completion, but not cancellation. It does not
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* make ('own') the request, therefore it cannot possibly cancel.
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* Users of this object must make sure that the request is already completed
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* or cancelled before this object is cancelled/deleted. DoCancel() of this
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* object panics (to avoid the hang).
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*/
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class CRequestCompleteCallback: public CActive
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    {
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    public:     // Constructors and destructor
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        /**
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        * Constructor.
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        */      
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        CRequestCompleteCallback();
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        /**
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        * Destructor.
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        */      
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        virtual ~CRequestCompleteCallback();
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    public:     // new methods
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        /**
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        * Start waiting for completion. A request (on iStatus of this object)
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        * must be outstanding.
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        * @param aCallback Callback to call when request completes.
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        * Note that the callback is called only once per CallbackOnCompletion()
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        * invocation (like in CAsyncOneShot etc.), and repeated callbacks are
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        * not supported. Therefore, the callback function must return EFalse.
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        */
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        void CallbackOnCompletion( const TCallBack& aCallback );
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    public:     // from CActive
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        /**
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        * Cancel protocol implementation: panic
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        * This object cannot cancel the request.
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        */
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        void DoCancel();
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        /**
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        * Request completed: call the callback.
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        */
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        void RunL();
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    private:    // data
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        TCallBack iCallback;    ///< The callback.
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    };
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#endif /* def REQUEST_COMPLETE_CALLBACK_H */