networkprotocolmodules/suplcontrolplaneprotocols/common/suplpositioningprotbase/inc/suplpositioningprotocolfsm.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Wed, 31 Mar 2010 23:44:31 +0300
branchRCL_3
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// Copyright (c) 2008-2009 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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// This file defines the base class and observer to allow a SUPL protocol
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// to send/receive messages to/from positioning protocol state machines.
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// 
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//
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/**
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 @file
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 @internalTechnology
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*/
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#ifndef CSUPLPOSITIONINGPROTOCOLFSM_H
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#define CSUPLPOSITIONINGPROTOCOLFSM_H
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#include <e32base.h>
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#include <lbs/lbslocdatasourcegpsbase.h>
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#include <lbs/lbsassistancedatabuilderset.h>
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#include <lbspositioninfo.h>
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#include <lbs/lbsloccommon.h>
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#include "lbstimer.h"
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#include <lbs/lbsnetcommon.h>
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#include <lbs/lbsnetprotocolbase.h>
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#include "suplpos.h"
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class CStateHandlerBase;
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/** Positioning Protocol observer mixin definition.
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	This defines an interface to be implemented by an observer of the Positioning Protocol.
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	The SUPL state machines implement this.
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*/
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class MSuplPositioningProtocolFsmObserver
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	{
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public:
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	/** Pass assistance data to the observer.
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	@return
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	*/
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	virtual void ProcessAssistanceData(const TLbsAsistanceDataGroup& aGroupMask, TInt aReason)= 0;
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	/** Send a positioning request to the observer.
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	*/
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	virtual void ProcessPositioningRequest(const TLbsNetPosRequestQuality& aQuality,
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										   const TLbsNetPosRequestMethod& aPosMethod) = 0;
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	/** Request from the observer that a SUPL POS is sent to the SLP with the provided payload
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	*/						
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	virtual void PositioningPayloadToNetwork(const CSuplPosPayload* aPositioningPayload) = 0;
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	/** Inform the observer that there has been an error in the positioning protocol. Expected
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	action is termination of the SUPL session via SUPL END.
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	*/
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	virtual void PositioningProtocolError(const TInt& aError) = 0;
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	/** Inform observer that the Positioning session has finished **/
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	virtual void PositioningSessionEnded() = 0;
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	};
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//-----------------------------------------------------------------------------
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// Positioning Protocol State Machine Base Class
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//-----------------------------------------------------------------------------
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/** Base class definition for positioning protocol state machines.
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This class provides support for common features of all state machines
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of positioning protocols associated to SUPL.
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A significant aspect incorporated in this base class is the active object
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mechanism for performing state transitions. This feature is used to provide
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state machines with the ability to perform autonomous and asynchronous actions
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e.g. to receive a indication of positioning protocol messages arriving from the
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network and to perform interactions with SUPL state machines.
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The base class includes various attributes that describe protocol activity,
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together with access methods used to retrieve the value of these attributes.
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*/
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class CSuplPositioningProtocolFsm : public CActive
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	{
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public:
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	/** State machine protocol state.
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	This defines the general protocol state for state machines.
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	*/
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	enum TPositioningProtocolState
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		{
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		/** Not valid */
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		EStateNull,
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		/** Ready to use, but not currently active. */
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		EStateReady,
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		/** Actively performing a protocol procedure.*/
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		EStateActive,
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		/** In the process of cancelling. */
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		EStateCancelling
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		};
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	/** State machine cancel source.
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	This defines the source of a cancellation.
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	*/
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	enum TCancelSource
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		{
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		/** Not cancelling */
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		ECancelNone,
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		/** The SUPL FSM cancelled the procedure */
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		ESuplFsmCancel,
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		/** A network error occurred */
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		ECancelNetworkError,
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		/** A network timeout occurred */
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		ECancelNetworkTimeout,
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		/** State machine is closing down (destruction)*/
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		ECancelClosing
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		};
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public:
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	virtual ~CSuplPositioningProtocolFsm();
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	// CActive derived methods
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	void RunL() = 0;
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	void DoCancel() = 0;
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	// Methods that must be overriden in derived classes
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	virtual void ProcessPositioningMessage(CSuplPosPayload* aMessage) = 0;
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	virtual void CancelMachine(const TCancelSource& aCancelSource, TInt aReason) = 0;
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	virtual void AssistanceDataRequest(const TLbsAssistanceDataGroup& aMask) = 0;
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	virtual void LocationResp(TInt aReason, const TPositionInfoBase& aPosInfo) = 0;
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	virtual bool IsAssistDataRequestAllowed() = 0; 
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protected:
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	CSuplPositioningProtocolFsm(MSuplPositioningProtocolFsmObserver& aObserver);
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protected:
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	/** Reference to State machine observer
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	*/
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	MSuplPositioningProtocolFsmObserver& iObserver;
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	};
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#endif // CSUPLPOSITIONINGPROTOCOLFSM_H