bluetooth/btstack/avctp/avctpmuxerstates.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 15 Jan 2010 08:13:17 +0200
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// Copyright (c) 2005-2009 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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// Defines classes to implement each state a Avctp Muxer can
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// be in.
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// 
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//
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/**
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 @file
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 @internalComponent
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*/
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#ifndef AVCTPTRANSPORTSTATES_H
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#define AVCTPTRANSPORTSTATES_H
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#include <e32base.h>
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#include <bluetoothav.h>
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// when rationalising logging, will not need this to get FLOG_ACTIVE MACRO in this header
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#include <comms-infras/commsdebugutility.h>
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#include "avctputils.h"
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// Forward definitions
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class TAvctpMuxerState;
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class RMBufChain;
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/**
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The state factory for AVCTP muxer states
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  @internalComponent
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*/
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NONSHARABLE_CLASS(CAvctpMuxerStateFactory) : public CBase
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	{
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friend class CAvctpProtocol; // So only the protocol can new up a state factory
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public:
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	/** Index of the Muxer states */
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	enum TAvctpMuxerStates
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		{
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		/** No link, prior to establishing the link*/
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		EClosed = 0,
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		/** Waiting for the lower protocol link */
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		ELinkPending = 1,
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		/** The lower protocol link has been established */
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		EOpen = 2,
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		/** The second lower protocol link is opening */
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		ESecondLinkPending = 3,
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		/** Both lower protocol links have been established */
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		EFullyOpen = 4,
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		/** Provides convenient way of numbering the states */
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		EMaxStates = 5,
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		};
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	TAvctpMuxerState& GetState(const TAvctpMuxerStates aState) const;
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	TInt StateIndex(const TAvctpMuxerState* aState) const;
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	~CAvctpMuxerStateFactory();
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private:
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	static CAvctpMuxerStateFactory* NewL();
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	CAvctpMuxerStateFactory();
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private:
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	/** The lightweight Muxer states */
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	TFixedArray<TAvctpMuxerState*, EMaxStates> iStates;
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	};
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// Forward Declarations
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class CAvctpTransport;
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class TBTDevAddr;
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class MSubConnectionControlClient;
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/**
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The base class for all the state classes in the AVCTP muxer state
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pattern.  These classes act as the state classes in the pattern,
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with the Muxer being the context. This class provides the default 
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implementation for the states.
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All states are flyweight classes managed by a State factory, so
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this class also has a pointer to the global factory singleton.
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There are four categories of events represented as pure virtual
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functions.  These are:
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1.	"Artificial" state events
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2.	Events coming in from the muxer's control clients.
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3.	Events coming in from the CAvctpSaps.
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4.	Events coming from below, via the L2CAP SAP.
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We don't panic on any events coming from below since these could be the
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result of defective remote behaviour and we don't want to give them a 
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means of bringing down our device. 
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Events coming from above we do panic if they are incorrect since any
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errors that reach this point are the result of programming errors.
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This is because CAvctpSap, CAvctpSapLinksMgr shield the muxer from
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direct interaction with other components / clients.
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For debugging purposes, a state name is implemented in derived classes 
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to allow state changes to be logged.
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This class defines basic default behaviour for all the events that
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a state responds to.
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Derived classes implement the events that they care about.
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@internalComponent
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*/
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NONSHARABLE_CLASS(TAvctpMuxerState)
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	{
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protected:
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	TAvctpMuxerState(CAvctpMuxerStateFactory& aFactory);
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public:
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	// "Artificial" state events
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	virtual void Enter(CAvctpTransport& aTransport) const;
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	virtual void Exit(CAvctpTransport& aTransport) const;
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	virtual TBool IsIdle(CAvctpTransport& aTransport) const;
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	virtual void IdleTimerExpired(CAvctpTransport& aTransport) const;
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	virtual TInt Start(CAvctpTransport& aTransport, const TBTDevAddr& aAddr, TUint16 aClientId) const;
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	virtual TInt StartIncoming(CAvctpTransport& aTransport, const TBTDevAddr& aAddr, CServProviderBase* aL2CAPConSAP) const;
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	virtual TInt AddSecondChannel(CAvctpTransport& aTransport, CServProviderBase& aSAP) const;
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	virtual void RemoveSecondChannel(CAvctpTransport& aTransport) const;
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	virtual TInt SecondChannelRemoved(CAvctpTransport& aTransport) const;
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	virtual TInt CancelConnectRequest(CAvctpTransport& aTransport, TUint16 aClientId) const;
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	// Events coming in on the user plane.
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	virtual void Shutdown(CAvctpTransport& aTransport, TInt aError) const;
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	// Events coming from below, via the L2CAP SAP.  These are
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	// essentially state transitions caused by the remote end.
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	virtual void Disconnect(CAvctpTransport& aTransport) const;
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	virtual void ConnectComplete(CAvctpTransport& aTransport) const;
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	virtual void Error(CAvctpTransport& aTransport, TInt aError,TUint aOperationMask, TInt aChannel) const;
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	virtual TInt NewData(CAvctpTransport& aTransport, TUint aMtu, TInt aChannel) const;
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	virtual void CanSend(CAvctpTransport& aTransport, TInt aChannel) const;
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#ifdef __FLOG_ACTIVE
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	TBuf<48> iName;
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#endif //__FLOG_ACTIVE
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protected:
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	// State change utility function
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	void ChangeState(CAvctpTransport& aTransport, CAvctpMuxerStateFactory::TAvctpMuxerStates aNewState) const;
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	void PanicInState(SymbianAvctp::TPanic aPanic) const;
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	void ShutDownSecondarySap(CAvctpTransport& aTransport, TBool aNotifyClient) const;
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private:
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    // Forbid copying
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	TAvctpMuxerState(const TAvctpMuxerState&);
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	const TAvctpMuxerState& operator=(const TAvctpMuxerState&) const;
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private:
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	/** The state factory, used to change states */
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	CAvctpMuxerStateFactory& iFactory;
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	};
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/**
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The closed state.
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This is the state that newly created saps start in, and the state
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they end in after a communication has closed down or a connection
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failed.
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Basically this is a quiescent state from which the Muxer can go to
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different futures though currently it commits suicide :] Note that
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though the delete attempts to be asynchronous, it's not guaranteed
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so it's best not to do anything with the muxer after changing state
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to closed.
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  @internalComponent
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*/
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NONSHARABLE_CLASS(TAvctpStateClosed) : public TAvctpMuxerState
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	{
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public:
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	TAvctpStateClosed(CAvctpMuxerStateFactory& aFactory);
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	// "Artificial" state events
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	virtual void Enter(CAvctpTransport& aTransport) const;
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	virtual void Exit(CAvctpTransport& aTransport) const;
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	virtual void IdleTimerExpired(CAvctpTransport& aTransport) const;
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	virtual TInt Start(CAvctpTransport& aTransport, const TBTDevAddr& aAddr, TUint16 aClientId) const;
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	// Events coming in on the control plane.
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	virtual TInt StartIncoming(CAvctpTransport& aTransport, const TBTDevAddr& aAddr, CServProviderBase* aL2CAPConSAP) const;
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	};
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/**
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The link pending state.
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Waiting for the L2CAP link to be created.
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  @internalComponent
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*/
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NONSHARABLE_CLASS(TAvctpStateLinkPending) : public TAvctpMuxerState
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 	{
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public:
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	TAvctpStateLinkPending(CAvctpMuxerStateFactory& aFactory);	
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	// "Artificial" state events
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	virtual void Enter(CAvctpTransport& aTransport) const;
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	virtual TBool IsIdle(CAvctpTransport& aTransport) const;
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	// Events coming in on the control plane.
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	virtual TInt CancelConnectRequest(CAvctpTransport& aTransport, TUint16 aClientId) const;
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	// Events coming from below, via the L2CAP SAP.  These are
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	// essentially state transitions caused by the remote end.
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	virtual void ConnectComplete(CAvctpTransport& aTransport) const;
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	virtual void Error(CAvctpTransport& aTransport, TInt aError,TUint aOperationMask, TInt aChannel) const;
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	};
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/**
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The open state.
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We have an open L2CAP link with the remote device
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  @internalComponent
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*/
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NONSHARABLE_CLASS(TAvctpStateOpen) : public TAvctpMuxerState
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	{
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public:
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	TAvctpStateOpen(CAvctpMuxerStateFactory& aFactory);
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	// "Artificial" state events
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	virtual void Enter(CAvctpTransport& aTransport) const;
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	virtual void Exit(CAvctpTransport& aTransport) const;
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	virtual TInt Start(CAvctpTransport& aTransport, const TBTDevAddr& aAddr, TUint16 aClientId) const;
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	virtual TInt AddSecondChannel(CAvctpTransport& aTransport, CServProviderBase& aSAP) const;
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	// Events coming in on the user plane.
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	virtual void Shutdown(CAvctpTransport& aTransport, TInt aError) const;
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	// Events coming from below, via the L2CAP SAP.  These are
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	// essentially state transitions caused by the remote end.
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	virtual void Disconnect(CAvctpTransport& aTransport) const;
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	virtual void Error(CAvctpTransport& aTransport, TInt aError,TUint aOperationMask, TInt aChannel) const;
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	virtual TInt NewData(CAvctpTransport& aTransport, TUint aMtu, TInt aChannel) const;
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	virtual void CanSend(CAvctpTransport& aTransport, TInt aChannel) const;
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	};
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/**
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The Second channel pending state.
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  @internalComponent
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*/
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NONSHARABLE_CLASS(TAvctpStateSecondChannelPending) : public TAvctpStateOpen
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	{
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public:
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	TAvctpStateSecondChannelPending(CAvctpMuxerStateFactory& aFactory);
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	virtual void Enter(CAvctpTransport& aTransport) const;
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	virtual void Exit(CAvctpTransport& aTransport) const;
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	virtual TInt Start(CAvctpTransport& aTransport, const TBTDevAddr& aAddr, TUint16 aClientId) const;
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	// Events coming in on the user plane.
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	virtual void Shutdown(CAvctpTransport& aTransport, TInt aError) const;
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	// Events coming from below, via the L2CAP SAP.  These are
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	// essentially state transitions caused by the remote end.
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	virtual void Disconnect(CAvctpTransport& aTransport) const;
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	virtual void Error(CAvctpTransport& aTransport, TInt aError,TUint aOperationMask, TInt aChannel) const;
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	virtual TInt NewData(CAvctpTransport& aTransport, TUint aMtu, TInt aChannel) const;
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	virtual void CanSend(CAvctpTransport& aTransport, TInt aChannel) const;
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	virtual void ConnectComplete(CAvctpTransport& aTransport) const;
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	virtual void RemoveSecondChannel(CAvctpTransport& aTransport) const;
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	};
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/**
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The fully open state.
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We have an open L2CAP link with the remote device
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  @internalComponent
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*/
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NONSHARABLE_CLASS(TAvctpStateFullyOpen) : public TAvctpStateOpen
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	{
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public:
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	TAvctpStateFullyOpen(CAvctpMuxerStateFactory& aFactory);
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	// "Artificial" state events
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	virtual void Enter(CAvctpTransport& aTransport) const;
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	virtual void Exit(CAvctpTransport& aTransport) const;
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	virtual TInt Start(CAvctpTransport& aTransport, const TBTDevAddr& aAddr, TUint16 aClientId) const;
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	virtual void RemoveSecondChannel(CAvctpTransport& aTransport) const;
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	virtual TInt SecondChannelRemoved(CAvctpTransport& aTransport) const;
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	// Events coming in on the user plane.
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	virtual void Shutdown(CAvctpTransport& aTransport, TInt aError) const;
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	// Events coming from below, via the L2CAP SAP.  These are
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	// essentially state transitions caused by the remote end.
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	virtual void Disconnect(CAvctpTransport& aTransport) const;
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	virtual void Error(CAvctpTransport& aTransport, TInt aError,TUint aOperationMask, TInt aChannel) const;
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	virtual TInt NewData(CAvctpTransport& aTransport, TUint aMtu, TInt aChannel) const;
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	virtual void CanSend(CAvctpTransport& aTransport, TInt aChannel) const;
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	};
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#ifdef __FLOG_ACTIVE
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#define STATENAME(x)  iName=_L(x)
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#else
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#define STATENAME(x)
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#endif
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#endif // AVCTPTRANSPORTSTATES_H 
29b1cd4cb562 Revision: 200951_001
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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