bluetooth/btstack/linkmgr/pairingscache.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 11 May 2010 17:15:36 +0300
branchRCL_3
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parent 0 29b1cd4cb562
permissions -rw-r--r--
Revision: 201017 Kit: 201019
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// Copyright (c) 2007-2009 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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//
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#include "pairingscache.h"
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#include "linkutil.h"
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/*static*/ CBTPairingsCache* CBTPairingsCache::NewL(MBTPairingsCacheObserver& aObserver, RBTRegServ& aRegServ)
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	{
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	CBTPairingsCache* self = new(ELeave) CBTPairingsCache(aObserver);
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	CleanupStack::PushL(self);
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	self->ConstructL(aRegServ);
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	CleanupStack::Pop(self);
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	return self;
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	}
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CBTPairingsCache::CBTPairingsCache(MBTPairingsCacheObserver& aObserver)
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	: iObserver(aObserver)
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	{
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	}
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void CBTPairingsCache::ConstructL(RBTRegServ& aRegServ)
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	{
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	iBTPairedBDAddrGetter = CBTPairedBDAddrGetter::NewL(*this, aRegServ);
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	DoUpdateCache();
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	}
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CBTPairingsCache::~CBTPairingsCache()
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	{
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	delete iBTPairedBDAddrGetter;
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	iPairedBDAddrs.Close();
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	}
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void CBTPairingsCache::UpdateCache()
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	{
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	// First we must cancel any outstanding request, as this will be called
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	// when the registry has been modified an an external (API) user, and
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	// so an in progress 'get' may have a stale view.
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	iBTPairedBDAddrGetter->Cancel();
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	DoUpdateCache();
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	}
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void CBTPairingsCache::DoUpdateCache()
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	{
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    RemoveAllPairedDevices(); // Clear out the cache as it may be stale.
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	iCacheState = EUpdateOutstanding;
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	iBTPairedBDAddrGetter->Retrieve();
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	}
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CBTPairingsCache::TPairingState CBTPairingsCache::IsPaired(const TBTDevAddr& aBDAddr)
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	{
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	// We initially assume that there is no pairing to the remote device.
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    CBTPairingsCache::TPairingState ret = ENotPaired;
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    // We determine whether they are in our pairing cache or not.
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    TBool inPairingCache = InPairingCache(aBDAddr);
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	// Now we do some additional work based on the state of the cache.
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	switch(iCacheState)
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		{
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	case EUpdateOutstanding:
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		// If an update has been requested then we make them
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		// wait for the answer.
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		ret = EDeferred;
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		break;
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	case EUpdateFailed:
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		// If we failed last time we should try again, and tell
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		// them to wait for the answer.
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		DoUpdateCache();
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		ret = EDeferred;
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		break;
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	case EValid:
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		// If the cache is valid then either we are paired or
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		// we aren't, the answer to which is based on whether they
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		// are in the cache or not.
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		break;
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	default:
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		Panic(EBTPairingsCacheBadState);
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		break;
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		}
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	// If we were already in the cache then that means there must be a pairing.
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	if(inPairingCache)
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		{
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		ret = EPaired;
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		}
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	// If we are deferring the decision about whether paired or not, then we 
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	// need to remember that we should inform the observer when we have 
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	// completed our attempt at getting an answer.
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	if(ret == EDeferred)
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		{
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		iDeferredDecision = ETrue;
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		}
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	return ret;
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	}
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TBool CBTPairingsCache::InPairingCache(const TBTDevAddr& aBDAddr)
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	{
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	return (PairedDeviceIndex(aBDAddr) >= 0) ? ETrue : EFalse;
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	}
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   114
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/**
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Wrapper for TBTDevAddr's == operation.
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This is needed by the TIdentityRelation parameter in RArray's Find method.
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*/
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/*static*/ TBool CBTPairingsCache::AreBDAddrsEqual(const TBTDevAddr& aA, const TBTDevAddr& aB)
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	{
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	return aA == aB;
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	}
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   123
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/**
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Returns either the index of the remote device address in the
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paired device address list if the specified address is
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included therein or KErrNotFound if not
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*/
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TInt CBTPairingsCache::PairedDeviceIndex(const TBTDevAddr& aBDAddr)
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	{
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	TIdentityRelation<TBTDevAddr> rel(AreBDAddrsEqual);
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	return iPairedBDAddrs.Find(aBDAddr, rel);
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	}
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TInt CBTPairingsCache::AddPairedDevice(const TBTDevAddr& aAddr)
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	{
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    __ASSERT_DEBUG(aAddr!=0, Panic(EBTConnectionBadDeviceAddress));
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	TInt err = KErrNone;
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	if(!InPairingCache(aAddr))
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		{
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		err = iPairedBDAddrs.Append(aAddr);
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		}
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	return err;
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	}
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void CBTPairingsCache::RemoveAllPairedDevices()
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	{
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	for(TInt i=iPairedBDAddrs.Count()-1; i>=0; i--)
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		{
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		iPairedBDAddrs.Remove(i);
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		}
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	}
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void CBTPairingsCache::InformObserver(TInt aError)
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	{
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    // Ensure that we inform the observer only if they have been deferred.
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	if(iDeferredDecision)
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		{
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		iDeferredDecision = EFalse;
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		iObserver.MbpcoDeferredDecisionResolved(aError);
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		}
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	}
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/*virtual*/ void CBTPairingsCache::MbpdnAddPairedDevices(const RBTDeviceArray& aAddrs)
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	{
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	__ASSERT_DEBUG(iCacheState == EUpdateOutstanding, Panic(EBTPairingsCacheBadState));
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	// check that the cache is still empty
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	__ASSERT_DEBUG(iPairedBDAddrs.Count() == 0, Panic(EBTPairingsCacheNotEmpty));
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	TInt err = KErrNone;
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	TInt count = aAddrs.Count();
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	for (TInt i=0; i<count; i++)
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		{
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		err = AddPairedDevice(aAddrs[i]->BDAddr());
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		if(err != KErrNone)
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			{
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			break;
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			}
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		}
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	// We handle add failures ourselves.
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	iCacheState = (err == KErrNone) ? EValid : EUpdateFailed;
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	// We inform the observer, even if there was an error because it is
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	// possible that we managed to get the address they were after.
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	InformObserver(err);
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	}
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/*virtual*/ void CBTPairingsCache::MbpdnErrorInGettingPairedDevices(TInt aError)
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	{
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	__ASSERT_DEBUG(iCacheState == EUpdateOutstanding, Panic(EBTPairingsCacheBadState));
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	// Current cache should be ok - we should have cleared it before a getter is
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	// started.  This simply sets the flag to indicate that the current (empty) cache 
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	// is either complete if aErr is KErrNotFound (or KErrNone) or incomplete
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	// if aErr is anything else. In the latter case if the cache is needed in future 
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	// another getter should be kicked off.
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	TInt err = (aError != KErrNone && aError != KErrNotFound) ? aError : KErrNone;
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	if(err != KErrNone)
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		{
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		iCacheState = EUpdateFailed;
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		}
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	else
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		{
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		iCacheState = EValid;
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		}
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   209
	
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	// Ensure that if we have been queried about the pairings and deferred the
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	// client, they must be informed.
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	InformObserver(err);
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	}
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parents:
diff changeset
   214