genericservices/activebackupclient/inc/abachandler.h
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/**
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* Copyright (c) 2004-2009 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 "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 CActiveBackupCallbackHandler
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* 
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*
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*/
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/**
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 @file
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*/
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#ifndef __ACTIVEBACKUPCALLBACKHANDLER_H__
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#define __ACTIVEBACKUPCALLBACKHANDLER_H__
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#include <e32base.h>
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#include <connect/abclient.h>
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#include <connect/abclientserver.h>
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namespace conn
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	{ 
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	class MActiveBackupDataClient;
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	class RABClientSession;
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	class CActiveBackupCallbackHandler : public CActive
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		/**
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		CActiveBackupCallbackHandler is used to handle the asynchronous calls back from the
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		active backup server. IPC only allows client initiated message transfer and hence the 
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		Active Backup Callback Handler must prime the server with an initial message and use 
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		the async response to "send" a message to the client side.
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		@internal component
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		*/
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		{
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	public:
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		/** 
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		Empty virtual destructor to avoid memory leaks
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		*/
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		virtual ~CActiveBackupCallbackHandler();
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		static CActiveBackupCallbackHandler* NewL(MActiveBackupDataClient* aABDC, 
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			RABClientSession& aClientSession);
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		/**
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		RunL will synchronously call the callback implementation passed in to this object
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		*/
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		void RunL();
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		/**
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		*/
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		void DoCancel();
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		/**
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		RunError implementation should send the leave code to the ABServer for propagation back 
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		to the SBEngine client. This enables any leaves from the callbacks to be returned to the 
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		PC for display/handling by the user
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		@return any unhandled error code
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		*/
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		TInt RunError(TInt aError);
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		void ConstructL();
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		void StartListeningForServerMessagesL();
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	private:
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		CActiveBackupCallbackHandler(MActiveBackupDataClient* aABDC, RABClientSession& aClientSession);
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		void PrimeServerForCallbackL();
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		void PrimeServerForCallbackWithResponseL(TInt aResponse);
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		void PrimeServerForCallbackWithResponseL(TDesC8& aResponse);
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		TPtr8 CreateFixedBufferL();
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	private:
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		/** Callback mixin implementation provided by the active backup client */
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		MActiveBackupDataClient* iActiveBackupDataClient;
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		/** The client session to call methods on */
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		RABClientSession& iClientSession;
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		/** This modifiable package buf is set by the Server to define which callback should 
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		be called on the client */
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		TPckgBuf<TABCallbackCommands> iCallbackCommand;
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		/** Modifiable package buf containing the first of a maximum of two arguments for the callback */
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		TPckgBuf<TInt> iCallbackArg1;
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		/** Modifiable package buf containing the second of a maximum of two arguments for the callback */
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		TPckgBuf<TInt> iCallbackArg2;
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		/** Buffer for holding transferred data from server */
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		HBufC8* iTransferBuffer;
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		};
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	} // end namespace
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#endif // __ACTIVEBACKUPCALLBACKHANDLER_H__
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