// Copyright (c) 2004-2009 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:

//

/**

 @file

 @internalTechnology

*/

#ifndef __NETSUBSCRIBE_H_

#define __NETSUBSCRIBE_H_

#include <e32base.h>

#include <e32std.h>

#include <elements/metadata.h>

namespace NetSubscribe

{

/**

 * Maximum length(in bytes) of TEvent data part supported by NetSubscribe. 

 * The length is returned by SMetaData::Length()

 *

 * @see SMetaData

 */

const TInt KMaxLength = 128;

const TInt KTransportUid = 0x102055AA;

enum ETransportTypes

	{

	/**

	 * Publish/Subscribe Transport type

	 */

	EPublishSubscribe

	//Another transport types should follow here

	};

class TEventClientData;

struct SSignalId;

class TEventBase;

class XSignal;

class CNetSubscribe : public CBase

/**

 * Client side of the signal subscription library. The class abstracts the mechanism the signals are

 * registered, trapped and the way event data are marhalled/demarshalled.

 * Derived class manages specific signal source & transport layer

 * Allows for multiple signal to be registered.

 *

 * @see XSignal

 *	@internalTechnology

 */

	{

	friend class TEvent;

public:

	IMPORT_C static CNetSubscribe* NewL( const Meta::STypeId& aTransportId );

	IMPORT_C ~CNetSubscribe();

protected:

	explicit CNetSubscribe();

	virtual void RegisterNewSignalL(TEventClientData& aData, const SSignalId& aSignalId ) = 0;

	void RegisterSignalL(TEventClientData& aData, const SSignalId& aSignalId );

	void DeRegisterSignal(TEventBase* aEvent);

protected:		

	RPointerArray<XSignal> iSignals;

	};

} // namespace NetSubscribe

#endif // __NETSUBSCRIBE_H_