// Copyright (c) 2002-2009 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:

//

#ifndef __LOGSERVCACHECONFIG_H__

#define __LOGSERVCACHECONFIG_H__

#include <logcli.h>

// Classes referenced

class MLogServDatabaseTransactionInterface;

/**

Caches a copy of the LogEng configuration data (a TLogConfig instance).

Provides public methods for retrieving/updating the configuration data.

if the configuration data is updated in a transaction, the changes will be committed/rolled back

when the transaction is committed/rolled back.  

Note: the LogEng configuration is kept in a database table with name "Config".

@see TLogConfig

@see MLogServDatabaseTransactionInterface

@internalComponent

*/

class CLogServCacheConfig : public CBase

	{

public:

	static CLogServCacheConfig* NewL(MLogServDatabaseTransactionInterface& aDatabase);

	~CLogServCacheConfig();

	const TLogConfig& Config() const;

	void UpdateL(const TLogConfig& aConfig);

#ifdef _DEBUG    

	inline TBool InTransaction() const;

#endif   

	void Commit();

	inline void Rollback();

private:

	CLogServCacheConfig(MLogServDatabaseTransactionInterface& aDatabase);

	void ConstructL();

	void ReadL();

private:

	MLogServDatabaseTransactionInterface& iDatabase;

	TLogConfig  iConfig;//The last good configuration value. Essentially, the current configuration

	TLogConfig  iRequestedConfiguration;//The requested configuration

	TBool       iInTransaction;//Indicates whether the configuration cache is currently within an update transaction

	};

#ifdef _DEBUG    

/**

Indicates whether a configuration transaction has begun

*/

inline TBool CLogServCacheConfig::InTransaction() const

    {

    return iInTransaction;

    }

#endif//_DEBUG

/**

Roll back a configuration transaction

*/

inline void CLogServCacheConfig::Rollback()

    {

    // Nothing really to do here other than discard the transaction status

    // (ready to start over again).

    iInTransaction = EFalse;

    }

#endif