// Copyright (c) 2001-2009 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 _ACLDATAQCONTROLLER_H

#define _ACLDATAQCONTROLLER_H

#include <e32base.h>

#include <bttypes.h>

class CAclDataQ;

struct TDataQConnectionInfo;

class CACLDataItem;

class CLinkMgrProtocol;

class CLinkMuxer;

class CHCIFacade;

/**

	Controller of the ACL data Q and of the pending packet list.

	This object holds in effect the model of how the HC operates its data 

	pool, knows when ACL data are ready to be send-off for transmission and 

	accounts for the ones pending transmission of the air interface.

*/

NONSHARABLE_CLASS(CACLDataQController) : public CBase

	{

public:

	static CACLDataQController* NewL(CLinkMgrProtocol& aProtocol,

		CLinkMuxer& aMuxer,

		TUint16 aBufSize,

		TUint16 aFrameOverhead,

		TUint aNumBufs);

	~CACLDataQController();

public:

	void InitialDataCredits(TUint16 aCredits);

	void AddItem(CACLDataItem& aACLFrame);

	TBool IssueNextACLDataFragment();

	void GetBufferInfo(TUint16& aBufSize, TUint& aNumBufs);

	void GetDataQRecords(TUint& aQFillLevel, TUint16& aCredits);

	CACLDataItem* GetFreeItem();

	TInt SetFlushInProgress(THCIConnHandle aConnH);

	void FlushComplete(TInt aErr, THCIConnHandle aConnH);

	void FlushOccurred(THCIConnHandle aConnH); // TODO: not actually called by HCI facade

	TInt ACLLogicalLinkUp(THCIConnHandle aConnH, TBool aIsParked);

	void ACLLogicalLinkDown(THCIConnHandle aConnH);

	void SetParked(THCIConnHandle aConnH, TBool aParked);

	void CompletedPackets(THCIConnHandle aConnH, TUint16 aNo);

private:

	CACLDataQController(CHCIFacade& aHCIFacade, CLinkMuxer& aMuxer);

	void ConstructL(CLinkMgrProtocol& aProtocol, TUint16 aBufSize, TUint16 aFrameOverhead, TUint aNumBufs);

	TInt FindConnection(THCIConnHandle aConnH);

	TBool AnotherPacketAllowed(TDataQConnectionInfo& aRecord);

	TBool SendItem(CACLDataItem& aItem);

	static TBool LinkMatch(const TDataQConnectionInfo& aA, const TDataQConnectionInfo& aB);

	THCIConnHandle HighestPriority();

private: // owned

	CAclDataQ*	iDataQ;

	// from HC, how many ACL packets we can send at any one time (varies 

	// according to how many are pending NumberOfCompletedPackets)

	TUint16		iDataCredits;

	RArray<TDataQConnectionInfo> iAclConns;

	// This is the index into iAclConns of the connection which last sent an 

	// item. This is used when finding the next link to allow to send, to 

	// implement fairer sharing of the link (otherwise connections near the 

	// start of the array get precedence over connections near the end).

	TUint iIndexOfLastSendingConn;

	TUint16     iNumControllerBufs;

private: // unowned

	CLinkMuxer&	iLinkMuxer;

	CHCIFacade& iHCIFacade;

	};

struct TDataQConnectionInfo

	{

public:

	THCIConnHandle	iConnH;

	// Number of packets that have been put on the queue but not yet sent over 

	// the air.

	TUint16			iPacketsQueued;

	// Number of packets on the air but not yet reported sent. 

	// (0-iPacketsPending) is the connection's priority when working out which 

	// connection to send from next.

	TUint16			iPacketsPending;

	TBool			iParked;

	TBool			iFlushInProgress;

	};

#endif // _ACLDATAQCONTROLLER_H