realtimenetprots/sipfw/SIP/ConnectionMgr/src/TStateActiveResolving.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:03:15 +0200
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// Copyright (c) 2004-2009 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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// Name        : TStateActiveResolving.cpp
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// Part of     : ConnectionMgr
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// Implementation
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// Version     : SIP/4.0
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//
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#include "TStateActiveResolving.h"
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#include "msipconnectioncontext.h"
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#include "SipLogs.h"
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// ----------------------------------------------------------------------------
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// TStateActiveResolving::Enter
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// ----------------------------------------------------------------------------
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//
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void TStateActiveResolving::Enter( TInt /*aError*/ )
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	{
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	__SIP_LOG( "TStateActiveResolving::Enter" )
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	iTimerValue = KInitialResolvingTimer;
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	iCumulativeTimerValue = KInitialResolvingTimer;
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	TInt err( KErrNone );
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    // Pass KErrNone for StartMonitoringL at this stage
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    // since error is needed only for context availability
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    // monitoring which is at this point unnecessary
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	if ( !iContext.DoTransportResourcesExist() )
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	    {
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	    TRAP( err,
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    		{
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    		iContext.CreateTransportResourcesL();
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    		iContext.StartMonitoringL( KErrNone );
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    		} );
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    	if ( err )
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    		{
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    		EnterState( MStateModel::EUnavailable, err );
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    		return;
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    		}
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	    }
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	if ( HasAddress() )
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		{
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		// Address has to exist, otherwise resolving hasn't been done at this
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		// point and we cannot enter to resolved state
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		EnterActiveResolvedState();
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		}
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	else
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		{		
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		TRAP( err, iTimerId = iTimer.StartL( this, KInitialResolvingTimer ) );
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		if( err )
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			{
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			EnterState( MStateModel::EUnavailable, err );
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			}
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		}
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	}
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// ----------------------------------------------------------------------------
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// TStateActiveResolving::Exit
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// ----------------------------------------------------------------------------
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//
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void TStateActiveResolving::Exit()
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	{
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	iTimer.Stop( iTimerId );
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	}
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// ----------------------------------------------------------------------------
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// TStateActiveResolving::NetworkStateChanged
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// ----------------------------------------------------------------------------
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//
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void TStateActiveResolving::NetworkStateChanged(
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    MSIPNetworkObserver::TNetworkState aState,
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    TInt aError )
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	{
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	  __SIP_INT_LOG2( "TStateActiveResolving::NetworkStateChanged", aState, aError )
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	if( aError)
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		{
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		if (iContext.ConnectionType()==MSIPConnectionContext::ELanBearer)
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		{
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		EnterState( MStateModel::EInactiveMonitoring, aError ); // For Any Error on WLAN, Enable Recovery Timers.
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		}
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		else
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		{
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		EnterState( MStateModel::EUnavailable, aError ); //For other bearers No recovery possible.
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		}
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		return;
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		}
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	if( aState == MSIPNetworkObserver::ENetworkSuspended )
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		{
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		EnterState( MStateModel::ESuspended );
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		}
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	else if( aState == MSIPNetworkObserver::ENetworkInactive )
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		{
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		EnterState( MStateModel::EInactiveMonitoring );
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		}
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	else if( aState == MSIPNetworkObserver::EConnectionLost )
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		{
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		EnterState( MStateModel::EInactiveConnecting );
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		}		
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	else
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		{
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		// do nothing, "else" required by PC-Lint..
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		}
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	}
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// ----------------------------------------------------------------------------
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// TStateActiveResolving::TimerExpiredL
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// ----------------------------------------------------------------------------
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//
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void TStateActiveResolving::TimerExpiredL( TTimerId /*aTimerId*/,
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								 		   TAny* /*aTimerParam*/ )
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	{
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    if( HasAddress() )
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        {
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        EnterActiveResolvedState();
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        }
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    else
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	    {
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		iTimerId = iTimer.StartL( this, CalculateTimerValue() );
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		}
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	}
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// ----------------------------------------------------------------------------
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// TStateActiveResolving::HasAddress
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// ----------------------------------------------------------------------------
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//
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TBool TStateActiveResolving::HasAddress()
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	{
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	TInetAddr address;
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	iContext.ResolveLocalAddress( address );
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	return ( !address.IsWildAddr() );
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	}
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// ----------------------------------------------------------------------------
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// TStateActiveResolving::CalculateTimerValue
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// ----------------------------------------------------------------------------
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//
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TUint TStateActiveResolving::CalculateTimerValue()
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    {
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    if ( iCumulativeTimerValue >= KStartDoublingTimerValue )
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        {
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        if ( iTimerValue < KMaximumResolvingTimer )
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            {
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            iTimerValue *= 2;
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            }
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        }
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    iCumulativeTimerValue += iTimerValue;    
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    return iTimerValue;
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    }
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// ----------------------------------------------------------------------------
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// TStateActiveResolving::EnterActiveResolvedState
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// ----------------------------------------------------------------------------
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//
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void TStateActiveResolving::EnterActiveResolvedState()
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    {
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    TRAPD( err, iContext.CreateDefaultTransportsL() )
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    if ( err )
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        {
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        EnterState( MStateModel::EUnavailable, err );
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        }
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    else
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        {
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        EnterState( MStateModel::EActiveResolved );
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        }
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    }