diff -r 000000000000 -r dfb7c4ff071f commsfwsupport/commselements/serverden/src/sd_mintercept.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/commsfwsupport/commselements/serverden/src/sd_mintercept.cpp	Thu Dec 17 09:22:25 2009 +0200
@@ -0,0 +1,963 @@
+// Copyright (c) 2008-2009 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:
+// messageintercept.cpp
+// 
+//
+
+/**
+ @file
+*/
+
+#include "sd_mintercept.h"
+#include <elements/sd_log.h>
+#include <elements/metatype.h>
+#include <e32debug.h>
+#include <elements/interfacetable.h>
+
+
+#ifdef _DEBUG
+// Panic category for "absolutely impossible!" vanilla ASSERT()-type panics from this module
+// (if it could happen through user error then you should give it an explicit, documented, category + code)
+_LIT(KSpecAssert_ElemSvrDenMIntC, "ElemSvrDenMIntC");
+#endif
+
+using namespace Messages;
+using namespace Meta;
+using namespace NetInterfaces;
+using namespace Elements;
+using namespace Den;
+
+_LIT(KMessageInterceptPanic, "message intercept panic");
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+_LIT(KInitalisationTimePanic, "Panic during initialisation of message intercept");
+#endif //#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+
+// Constants
+//----------
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+const TUint KMaxExpectedRegisteredNodes = 32;
+const TUint KMaxExpectedPatterns = 32;
+#endif //#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+// Helper function for comparing two TMessageId
+//---------------------------------------------
+TInt CompareTMessageId(const TNodeSignal::TMessageId& aMsg1, const TNodeSignal::TMessageId& aMsg2)
+	{
+    // return 0 is the objects are equal
+    // return negative value if first is less than second
+    // return positive if first is greater than second
+	if (aMsg1.Realm()==aMsg2.Realm())
+    	{
+    	return aMsg1.MessageId() - aMsg2.MessageId();
+    	}
+    return aMsg1.Realm() - aMsg2.Realm();
+	}
+#endif //#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+
+// AFallibleTestControl (control interface)
+//-----------------------------------------
+void AFallibleTestControl::InitL(const RArray<TNodeSignal::TMessageId>& aArray)
+	{
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	//copying the memory, not the array as its lifetime is temporary
+	iFallibleMessages.Reset();
+	TLinearOrder<TNodeSignal::TMessageId> order(CompareTMessageId);
+	for (TInt i=0; i<aArray.Count(); i++)
+		{
+		const TNodeSignal::TMessageId& msg = aArray[i];
+		// not allowing duplicate, leave with KErrAlreadyExists if so
+		iFallibleMessages.InsertInOrderL(msg, order);
+		}
+#else
+	// Fixing unused local variable warnings.
+	(void)aArray;
+
+	User::Leave(KErrNotSupported);
+#endif //#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	};
+
+// CMessageInterceptRegister
+//--------------------------
+CMessageInterceptRegister::CMessageInterceptRegister()
+:	TIfStaticFetcherNearestInHierarchy(this),
+	iPatternList(),
+	iRegisteredNodeTable(),
+	iState(EResetState)
+	{}
+
+CMessageInterceptRegister* CMessageInterceptRegister::SetGlobal(CMessageInterceptRegister* aContext)
+	{
+	CMessageInterceptRegister* previous = reinterpret_cast<CMessageInterceptRegister*>(Dll::Tls());
+	__ASSERT_DEBUG(!previous || !aContext, User::Panic(KSpecAssert_ElemSvrDenMIntC, 1));
+	Dll::SetTls(aContext);
+	return previous;
+	}
+
+//Only to be used by CCommonWorkerThread
+CMessageInterceptRegister& CMessageInterceptRegister::GetGlobal()
+	{
+	CMessageInterceptRegister* context = reinterpret_cast<CMessageInterceptRegister*>(Dll::Tls());
+	__ASSERT_DEBUG(context, User::Panic(KSpecAssert_ElemSvrDenMIntC, 2));
+	return *context;
+	}
+
+TInt CMessageInterceptRegister::MatchIncomingEvent(const TEventSummaryTriple& aEvent, TAction& aAction)
+	{
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	// Fetch the current expression (from the current pattern) that we are waiting on next
+	const TEventExpression& expression = iPatternList.CurrentPattern().CurrentExpression();
+
+	// First need to look up sender and receiver in the node register
+	// as both need to have been registered to make anything of the incoming event
+	TNodeSpecifier senderNode;
+	TNodeSpecifier receiverNode;
+
+	TInt errorTx = FetchRegisteredNodeInfo(aEvent.SenderId(), senderNode);
+	TInt errorRx = FetchRegisteredNodeInfo(aEvent.ReceiverId(), receiverNode);
+
+	TInt matchResult;
+
+	if(errorTx == KErrNone && errorRx == KErrNone)
+		{
+		// Create full event info (incoming event info + provider info fetched from node register)
+		TEventInfo fullEventInfo(senderNode, aEvent.Message(), receiverNode);
+
+		// Compare against current expression we are matching against and return any action if a match
+		matchResult = CompareEventWithExpression(fullEventInfo, expression);
+
+		// If we matched then advance the list of expressions
+		if(matchResult == KErrNone)
+			{
+			iPatternList.CurrentPattern().Expressions().Advance();
+
+			// Advance the pattern itself if necessary
+			if(iPatternList.CurrentPattern().IsComplete())
+				{
+				aAction = iPatternList.CurrentPattern().Action();
+				iPatternList.Advance();
+				return KErrNone;
+				}
+			else
+				return KErrNotFound;
+			}
+		else
+			return KErrNotFound;
+		}
+	else
+		{
+		return KErrNotFound;
+		}
+#else
+	// Fixing unused local variable warnings.
+	(void)aEvent;
+	(void)aAction;
+
+	return KErrNotSupported;
+#endif //#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	}
+
+
+TInt CMessageInterceptRegister::CompareEventWithExpression(
+	const TEventInfo& aEvent,
+	const TEventExpression& aExpression)
+	{
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	// Compare MESSAGE type first (quickest test and more often than not only a single test needed)
+	TBool msgMatch = aExpression.MessageExpression().Compare(aEvent.Message());
+
+	// If we are already not matched then no use continuing
+	if(!msgMatch)
+		{
+		return KErrNotFound;
+		}
+	else
+		{
+		// Now compare the SENDER properties against what we are expecting
+		TBool senderMatch = aExpression.SenderExpression().Compare(aEvent.Sender());
+
+		// If we aren't matched then no use continuing
+		if(!senderMatch)
+			{
+			return KErrNotFound;
+			}
+		else
+			{
+			// Firstly do we need to update tag in the node register
+			if(aExpression.SenderExpression().SetTagOnMatch())
+				{
+				iRegisteredNodeTable.SetNodeTag(aEvent.Sender().Id(), aExpression.SenderExpression().TagToSet());
+				}
+
+			// Now compare the RECEIVER
+			TBool receiverMatch = aExpression.ReceiverExpression().Compare(aEvent.Receiver());
+
+			// If we aren't matched then no use continuing
+			if(!receiverMatch)
+				{
+				return KErrNotFound;
+				}
+			else
+				{
+				// Firstly do we need to update tag in the node register
+				if(aExpression.ReceiverExpression().SetTagOnMatch())
+					{
+					iRegisteredNodeTable.SetNodeTag(aEvent.Receiver().Id(), aExpression.ReceiverExpression().TagToSet());
+					}
+
+				// ### COMPLETE MATCH ###
+				// We have every element so a full match
+				return KErrNone;
+				}
+			}
+		}
+#else
+	// Fixing unused local variable warnings.
+	(void)aEvent;
+	(void)aExpression;
+
+	return KErrNotSupported;
+#endif //#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	}
+
+CMessageInterceptRegister* CMessageInterceptRegister::NewL()
+	{
+	CMessageInterceptRegister* self = new(ELeave) CMessageInterceptRegister();
+	CleanupStack::PushL(self);
+	self->ConstructL();
+	CleanupStack::Pop();
+	return self;
+	}
+
+void CMessageInterceptRegister::ConstructL()
+	{
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	// Create the worker lock used to synchronise access to the message intercept register
+	// We absolutely need it so out of here if we can't create it
+	TInt error = iSynchronisedUseLock.CreateLocal();
+	User::LeaveIfError(error);
+
+	// Resize the node register as we need it
+	iRegisteredNodeTable.ReserveL(KMaxExpectedRegisteredNodes);
+
+	// Need to make sure we reserve space for at least as many patterns to register
+	// Don't want to be allocating memory during operation
+	iPatternList.ReserveL(KMaxExpectedPatterns);
+	iPatternList.SetOwner(this);
+#else
+	User::Leave(KErrNotSupported);
+#endif //#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	}
+
+/** Look up a previously registered node */
+TInt CMessageInterceptRegister::FetchRegisteredNodeInfo(const TNodeId& aNodeId, TNodeSpecifier& aNode)
+	{
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	TInt index = iRegisteredNodeTable.FindNode(aNodeId);
+	if (index < 0)
+		{
+		return index;
+		}
+	else
+		{
+		aNode = iRegisteredNodeTable[index];
+		return KErrNone;
+		}
+#else
+	// Fixing unused local variable warnings.
+	(void)aNodeId;
+	(void)aNode;
+
+	return KErrNotSupported;
+#endif //#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	}
+
+// Destructor
+CMessageInterceptRegister::~CMessageInterceptRegister()
+	{
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	iRegisteredNodeTable.Reset();
+	iPatternList.ResetAndDestroy();
+	iSynchronisedUseLock.Close();
+	iFallibleMessages.Close();
+#endif//#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	}
+
+void CMessageInterceptRegister::ResetStatusVariables()
+	{
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	iState = EResetState;
+#endif //#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	}
+
+void CMessageInterceptRegister::SetComplete(TAny* aFrom)
+	{
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	(void)(aFrom != NULL); //keep compiler happy
+	__ASSERT_DEBUG(static_cast<TAny*>(aFrom) == static_cast<TAny*>(&iPatternList), User::Panic(KSpecAssert_ElemSvrDenMIntC, 3));
+	iState = EPassedState;
+	COMMONLOG((TWorkerThreadPublicInfo::EMainThread, KECommonServerTag, _L8("Register set complete:")));
+#else
+	// Fixing unused local variable warnings.
+	(void)aFrom;
+#endif //#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	}
+
+#ifdef _DEBUG
+void CMessageInterceptRegister::PrintAllFallibleMessages()
+	{
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	for (TInt i = 0; i < iFallibleMessages.Count(); i++)
+		{
+		RDebug::Print( _L("Fallible Message: %d, Id = %d, Realm = %d\n"), i+1, iFallibleMessages[i].MessageId(),
+						iFallibleMessages[i].Realm());
+		}
+#endif //#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	}
+#endif // _DEBUG
+
+void CMessageInterceptRegister::RelinguishAccessOperation(TAny* aPtr)
+	{
+	CMessageInterceptRegister *obj = reinterpret_cast<CMessageInterceptRegister*> (aPtr);
+	__ASSERT_DEBUG(obj, User::Panic(KSpecAssert_ElemSvrDenMIntC, 4));
+	obj->RelinquishAccess();
+	}
+
+// EXPORTED
+
+EXPORT_C NetInterfaces::TInterfaceControl& CMessageInterceptRegister::GetInterfaceControl()
+	{
+	CMessageInterceptRegister* context = reinterpret_cast<CMessageInterceptRegister*>(Dll::Tls());
+	__ASSERT_DEBUG(context, User::Panic(KSpecAssert_ElemSvrDenMIntC, 5));
+	return *context;
+	}
+
+// Enable the register
+EXPORT_C TInt CMessageInterceptRegister::Enable()
+	{
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	// ### SYNCHRONISE ACCESS ###
+	WaitForAccess();
+
+	// Must reset before re-enabling if already been completed
+	__ASSERT_DEBUG(iState == EResetState, User::Panic(KSpecAssert_ElemSvrDenMIntC, 6));
+	iState = ERunningState;
+	COMMONLOG((TWorkerThreadPublicInfo::EMainThread, KECommonServerTag, _L8("Enabled:")));
+	iMode = EPatternMatch;
+
+	// ### SYNCHRONISE ACCESS ###
+	RelinquishAccess();
+
+	return KErrNone;
+#else
+	return KErrNotSupported;
+#endif // __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	}
+
+// MPatternMatchControl (control interface)
+//-----------------------------------------
+
+// Reset the message intercept register (but retain the register of nodes, including any tags applied)
+EXPORT_C TInt CMessageInterceptRegister::SoftReset()
+	{
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	// ### SYNCHRONISE ACCESS ###
+	WaitForAccess();
+
+	// Disable the register (stop it intercepting if it is currently)
+	Disable();
+
+	// Clear the pattern table
+	ResetStatusVariables();
+	iPatternList.ResetForReuse(ETrue);
+	COMMONLOG((TWorkerThreadPublicInfo::EMainThread, KECommonServerTag, _L8("Soft reset:")));
+
+	// ### SYNCHRONISE ACCESS ###
+	RelinquishAccess();
+
+	return KErrNone;
+#else
+	return KErrNotSupported;
+#endif // __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	}
+
+// Reset the whole register (patterns and node instances)
+EXPORT_C TInt CMessageInterceptRegister::HardReset()
+	{
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	// ### SYNCHRONISE ACCESS ###
+	WaitForAccess();
+
+	// Disable the register
+	Disable();
+
+	// Clear both registers
+	ResetStatusVariables();
+	iPatternList.ResetForReuse(ETrue);
+	iRegisteredNodeTable.Reset();
+	COMMONLOG((TWorkerThreadPublicInfo::EMainThread, KECommonServerTag, _L8("Hard reset:")));
+
+	// ### SYNCHRONISE ACCESS ###
+	RelinquishAccess();
+
+	return KErrNone;
+#else
+	return KErrNotSupported;
+#endif // __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	}
+
+// Allow the client to query the completion of the message pattern matching
+EXPORT_C TInt CMessageInterceptRegister::QueryComplete()
+	{
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	// ### SYNCHRONISE ACCESS ###
+	WaitForAccess();
+
+	TInt state = static_cast<TInt>(iState);
+	//COMMONLOG(_L8("Query complete: status:%d"), state);
+
+	// ### SYNCHRONISE ACCESS ###
+	RelinquishAccess();
+
+	return state;
+#else
+	return KErrNotSupported;
+#endif // __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	}
+
+EXPORT_C TInt CMessageInterceptRegister::AppendPattern(const CPattern* aPatternToAppend)
+	{
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	// ### SYNCHRONISE ACCESS ###
+	WaitForAccess();
+
+	// Take ownership by appending to our list of patterns
+	TRAPD(error, iPatternList.AppendL(aPatternToAppend));
+	//COMMONLOG(_L8("Append pattern: err:%d"), error);
+
+	// ### SYNCHRONISE ACCESS ###
+	RelinquishAccess();
+
+	return error;
+#else
+	// Fixing unused local variable warnings.
+	(void)aPatternToAppend;
+
+	return KErrNotSupported;
+#endif // __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	}
+
+// Append a new pattern to the pattern matching schedule
+EXPORT_C TInt CMessageInterceptRegister::AppendExpression(const TEventExpression& aExpression)
+	{
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	TInt error = KErrNone;
+
+	// ### SYNCHRONISE ACCESS ###
+	WaitForAccess();
+
+	// Do we need a new temporary holding list
+	if(!iExpressionHoldingList)
+		{
+		iExpressionHoldingList = new RExpressionList();
+		if(!iExpressionHoldingList)
+			{
+			User::Panic(KInitalisationTimePanic, KErrNoMemory);
+			}
+
+		TRAPD(error, iExpressionHoldingList->ReserveDefaultSpaceL());
+		if(error != KErrNone)
+			{
+			User::Panic(KInitalisationTimePanic, error);
+			}
+		}
+
+	// Append our expression to the list
+	error = iExpressionHoldingList->Append(aExpression);
+	if(error != KErrNone)
+		{
+		User::Panic(KInitalisationTimePanic, error);
+		}
+
+	//COMMONLOG(_L8("Append expression: err:%d"), error);
+
+	// ### SYNCHRONISE ACCESS ###
+	RelinquishAccess();
+
+	return KErrNone;
+#else
+	// Fixing unused local variable warnings.
+	(void)aExpression;
+
+	return KErrNotSupported;
+#endif // __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	}
+
+EXPORT_C TInt CMessageInterceptRegister::AppendAction(const TAction& aAction)
+	{
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	// ### SYNCHRONISE ACCESS ###
+	WaitForAccess();
+
+	// Must have a list of expressions that we are terminating with this action
+	__ASSERT_DEBUG(iExpressionHoldingList, User::Panic(KSpecAssert_ElemSvrDenMIntC, 7));
+	__ASSERT_DEBUG(iExpressionHoldingList->Count() > 0, User::Panic(KSpecAssert_ElemSvrDenMIntC, 8));
+	TInt error;
+	CPattern* newPattern = NULL;
+	TRAP(error, newPattern = CPattern::NewL(*iExpressionHoldingList, aAction));
+	if(error == KErrNone)
+		{
+		TRAP(error, iPatternList.AppendL(newPattern));
+		}
+
+	//COMMONLOG(_L8("Appended action:0x%x ErrorCode:0x%x err:%d"), aAction.Action(), aAction.Error(), error);
+
+	// Refresh the holding store for new expressions
+	delete iExpressionHoldingList;
+	iExpressionHoldingList = NULL;
+
+	// ### SYNCHRONISE ACCESS ###
+	RelinquishAccess();
+
+	return error;
+#else
+	// Fixing unused local variable warnings.
+	(void)aAction;
+
+	return KErrNotSupported;
+#endif // __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	}
+
+// Enable the register using the counter
+EXPORT_C TInt CMessageInterceptRegister::Enable(const TInt aMsgCount)
+	{
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	// ### SYNCHRONISE ACCESS ###
+	WaitForAccess();
+
+	Disable();
+	ResetStatusVariables();
+
+	// Must reset before re-enabling if already been completed
+	__ASSERT_DEBUG(iState == EResetState, User::Panic(KSpecAssert_ElemSvrDenMIntC, 9));
+	iState = ERunningState;
+	iCount = aMsgCount;
+	iErrInjectedFlag = EFalse;
+
+	COMMONLOG((TWorkerThreadPublicInfo::EMainThread, KECommonServerTag, _L8("Enabled with counter:")));
+
+	iMode = EFallibleTest;
+
+	// ### SYNCHRONISE ACCESS ###
+	RelinquishAccess();
+
+	return KErrNone;
+#else
+	// Fixing unused local variable warnings.
+	(void)aMsgCount;
+
+	return KErrNotSupported;
+#endif //__ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	}
+
+// Check
+EXPORT_C TBool CMessageInterceptRegister::CheckFinished()
+	{
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	TBool Result = EFalse;
+
+	// ### SYNCHRONISE ACCESS ###
+	WaitForAccess();
+
+	if (iCount > 0)
+		{
+		Result = ETrue;
+		}
+
+	// ### SYNCHRONISE ACCESS ###
+	RelinquishAccess();
+
+	return Result;
+#else
+	return EFalse;
+#endif //__ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	}
+
+// MNodeIntercept (interface for nodes in to the register during opertion)
+//------------------------------------------------------------------------
+
+// Register a newly constructed node
+EXPORT_C TInt CMessageInterceptRegister::RegisterNewNode(const TNodeSpecifier& aNodeToRegister)
+	{
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	TInt error = KErrNone;
+
+	// Cheaply return if not running
+	if(!IsRunning())
+		return KErrNone;
+
+	// ### SYNCHRONISE ACCESS ###
+	WaitForAccess();
+
+	// Yes we need to check again as we were not under the protection of the register's mutex
+	// when we decided not to cheaply return above
+	if(IsRunning())
+		{
+		// Something wrong if we already exist in the table
+		__ASSERT_DEBUG(iRegisteredNodeTable.FindNode(aNodeToRegister.Id()) < 0, User::Panic(KSpecAssert_ElemSvrDenMIntC, 10));
+		error = iRegisteredNodeTable.InsertNode(aNodeToRegister);
+
+		//COMMONLOG(_L8("Registered node: 0x%x err:%d"), aNodeToRegister.Id().Ptr(), error);
+		}
+
+	// ### SYNCHRONISE ACCESS ###
+	RelinquishAccess();
+
+	return error;
+#else
+	// Fixing unused local variable warnings.
+	(void)aNodeToRegister;
+
+	return KErrNotSupported;
+#endif //__ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	}
+
+// Perform message interception on an incoming message
+EXPORT_C void CMessageInterceptRegister::QueryMessageInterceptL(const TEventSummaryTriple& aIncomingEvent)
+	{
+#ifdef __ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+	TAction resultingAction;
+
+	// Cheaply return if not running
+	if(!IsRunning())
+		return;
+
+	switch (iMode)
+		{
+		case EFallibleTest:
+			{
+			// Perform message interception on an incoming message for testing all fallible messages
+
+			// ### SYNCHRONISE ACCESS ###
+			WaitForAccess();
+			CleanupStack::PushL(TCleanupItem(RelinguishAccessOperation, this));
+
+			if (iErrInjectedFlag)
+				{
+				CleanupStack::PopAndDestroy();  // RelinquishAccess() is called
+				return; // Ignore error propagation messages
+				}
+
+			// Ignore messages already tested
+			if (iCount > 0)
+				{
+				--iCount;
+				}
+
+			if (iCount == 0)
+				{
+				TLinearOrder<TNodeSignal::TMessageId> order(CompareTMessageId);
+				if (iFallibleMessages.FindInOrder(aIncomingEvent.Message().MessageId(), order) != KErrNotFound)
+					{
+					iErrInjectedFlag = ETrue;
+
+					// TBC Error configured by client
+					User::Leave(KErrNoMemory);
+					}
+				else
+					{
+					// set back the counter which is used by CheckFinished
+					// this tells that the last msg is not a fallible one
+					iCount = 1;
+					}
+				}
+			CleanupStack::Pop(); // simply pop the TCleanupItem
+			// ### SYNCHRONISE ACCESS ###
+			RelinquishAccess();
+			}
+		break;
+
+		case EPatternMatch:
+			{
+			TInt error = KErrNotFound;
+
+			// ### SYNCHRONISE ACCESS ###
+			WaitForAccess();
+
+				// We must be running at least
+			// Yes we need to check again as we were not under the protection of the register's mutex
+			// when we decided not to cheaply return above
+			if(IsRunning())
+				{
+				// Query if the new event matches the event we are waiting for
+				// Need to peek inside the sender as NodePtr will fail as sender not necessarily in it own thread
+				//COMMONLOG(_L8("Event: tx:0x%x msg:%d rx:0x%x err:%d"), aIncomingEvent.SenderId().Ptr(), aIncomingEvent.Message().MessageId().MessageId(), aIncomingEvent.ReceiverId().Ptr(), error);
+				error = MatchIncomingEvent(aIncomingEvent, resultingAction);
+				}
+
+			// ### SYNCHRONISE ACCESS ###
+			RelinquishAccess();
+
+			// If have found Cause action specified by querying the register or return as expected
+			if(error == KErrNone)
+				{
+				//COMMONLOG(_L8("Executing action:0x%x ErrorCode:0x%x"), resultingAction.Action(), resultingAction.Error());
+				resultingAction.ExecuteActionL();
+				}
+			}
+		break;
+
+		default:
+			__ASSERT_DEBUG(0, User::Panic(KSpecAssert_ElemSvrDenMIntC, 11));
+			break;
+	}
+#else
+	// Fixing unused local variable warnings.
+	(void)aIncomingEvent;
+
+	User::Leave(KErrNotSupported);
+#endif //__ELEMENTS_MESSAGE_INTERCEPT_ACTIVE
+}
+
+
+// RExpressionList
+//----------------
+void RExpressionList::Advance()
+	{
+	// Can't advance an empty list
+	__ASSERT_DEBUG(Count(), User::Panic(KSpecAssert_ElemSvrDenMIntC, 12));
+	__ASSERT_DEBUG(iCurrentIndex < Count(), User::Panic(KSpecAssert_ElemSvrDenMIntC, 13));
+
+	COMMONLOG((TWorkerThreadPublicInfo::EMainThread, KECommonServerTag, _L8("Expression list advanced:")));
+
+	if((++iCurrentIndex) == Count())
+		{
+		__ASSERT_DEBUG(iOwner, User::Panic(KSpecAssert_ElemSvrDenMIntC, 14));
+		iOwner->SetComplete(this);
+		}
+	}
+
+void CPattern::SetComplete(TAny* aFrom)
+	{
+	(void)(aFrom != NULL); //keep compiler happy
+	__ASSERT_DEBUG(static_cast<TAny*>(aFrom) == static_cast<TAny*>(&iExpressions), User::Panic(KSpecAssert_ElemSvrDenMIntC, 15));
+	iIsComplete = ETrue;
+	COMMONLOG((TWorkerThreadPublicInfo::EMainThread, KECommonServerTag, _L8("Pattern set complete:")));
+	}
+
+
+const TEventExpression& RExpressionList::CurrentExpression() const
+	{
+	// Get the current expression
+	__ASSERT_DEBUG(iCurrentIndex < Count(), User::Panic(KSpecAssert_ElemSvrDenMIntC, 16));
+	return this->operator[](iCurrentIndex);
+	}
+
+// TMsgExpression
+//---------------
+TBool TMsgExpression::Compare(const TNodeSignal& aMessage) const
+	{
+	// We consider the messages to be the same if they have the same type id
+	// ie. they are the same type of message and we don't consider any parameters
+	return (aMessage.MessageId().MessageId() == iMessageId) && (aMessage.MessageId().Realm() == iRealm);
+	}
+
+// RPatternList
+//-------------
+CPattern& RPatternList::CurrentPattern()
+	{
+	// Get the current pattern
+	__ASSERT_DEBUG(iCurrentIndex < Count(), User::Panic(KSpecAssert_ElemSvrDenMIntC, 17));
+	return *(this->operator[](iCurrentIndex));
+	}
+
+void RPatternList::Advance()
+	{
+	// Advance the list of expressions which will notify the parent register if necessary
+	// Shouldn't be trying to advance an empty list
+	__ASSERT_DEBUG(Count(), User::Panic(KSpecAssert_ElemSvrDenMIntC, 18));
+	__ASSERT_DEBUG(iCurrentIndex < Count(), User::Panic(KSpecAssert_ElemSvrDenMIntC, 19));
+
+	COMMONLOG((TWorkerThreadPublicInfo::EMainThread, KECommonServerTag, _L8("Pattern list advanced:")));
+
+	if((++iCurrentIndex) == Count())
+		{
+		__ASSERT_DEBUG(iOwner, User::Panic(KSpecAssert_ElemSvrDenMIntC, 20));
+		iOwner->SetComplete(this);
+		}
+	}
+
+void RPatternList::ResetForReuse(TBool aSameOwner)
+	{
+	ResetAndDestroy();
+	iCurrentIndex = 0;
+	if(!aSameOwner)
+		{
+		iOwner = NULL;
+		}
+	}
+
+// CPattern
+//---------
+EXPORT_C CPattern* CPattern::NewL(const RExpressionList& aExpressionList, const TAction& aAction)
+	{
+	CPattern* self = new(ELeave) CPattern(aExpressionList, aAction);
+	CleanupStack::PushL(self);
+	self->ConstructL();
+	CleanupStack::Pop();
+	return self;
+	}
+
+void CPattern::ConstructL()
+	{
+	}
+
+CPattern::~CPattern()
+	{
+	iExpressions.Reset();
+	}
+
+const TEventExpression& CPattern::CurrentExpression() const
+	{
+	return iExpressions.CurrentExpression();
+	}
+
+TInt CPattern::AppendExpression(TEventExpression& aExpression)
+	{
+	return iExpressions.Append(aExpression);
+	}
+
+void CPattern::InitAction(const TAction& aAction)
+	{
+	// Simply assign the new action and mark ourselves as now terminated
+	__ASSERT_DEBUG(!iIsTerminated, User::Panic(KSpecAssert_ElemSvrDenMIntC, 21));
+	SetAction(aAction);
+	iIsTerminated = ETrue;
+	}
+
+TBool CPattern::IsTerminated() const
+	{
+	return iIsTerminated;
+	}
+
+void CPattern::SetAction(const TAction& aAction)
+	{
+	iAction = aAction;
+	}
+
+// RRegisteredNodeList
+//--------------------
+TInt RRegisteredNodeList::SetNodeTag(const TNodeId& aNodeId, TNodeTag aTag)
+	{
+	// Lookup the tag in the
+	TInt index = FindInUnsignedKeyOrder(aNodeId);
+
+	// We are in some sort of trouble if we couldn't find the
+	if(index < 0)
+		return index;
+	else
+		{
+		// Set the tag - can't already be tagged
+		__ASSERT_DEBUG(operator[](index).Tag().Length() == 0, User::Panic(KSpecAssert_ElemSvrDenMIntC, 22));
+		operator[](index).SetTag(aTag);
+		}
+
+	return KErrNone;
+	}
+
+TInt RRegisteredNodeList::Compare(const TNodeSpecifier& aLHS, const TNodeSpecifier& aRHS)
+	{
+	// How about just being ultra sure that nothing has changed in the world of TCookie
+	__ASSERT_DEBUG(aLHS.Id().Size() == 12, User::Panic(KSpecAssert_ElemSvrDenMIntC, 23));
+
+	// Simply compare the cookies
+	const TUint* LHS = (reinterpret_cast<const TUint*>(&(aLHS.Id())));
+	const TUint* RHS = (reinterpret_cast<const TUint*>(&(aRHS.Id())));
+
+	if(LHS[0] < RHS[0])
+		{
+		return -1;
+		}
+	else if(LHS[0] > RHS[0])
+		{
+		return 1;
+		}
+	else if(LHS[1] > RHS[1])
+		{
+		return 1;
+		}
+	return 0;
+	}
+
+
+// TNodeExpression
+//----------------
+TBool TNodeExpression::Compare(const TNodeSpecifier& aNode) const
+	{
+	TBool areEqual(EFalse);
+
+	switch (iMatchType)
+		{
+		case EMatchByInstance:
+			{
+			// Compare only on the basis of earier applied identity (descriptor tag)
+			areEqual = (iMatchTag == aNode.Tag());
+			}
+		break;
+
+		case EMatchByUid:
+			{
+			// Compare only on the basis of UID
+			areEqual = (iUid == aNode.Uid());
+			}
+		break;
+
+		default:
+			__ASSERT_DEBUG(0, User::Panic(KSpecAssert_ElemSvrDenMIntC, 24));
+			break;
+		}
+
+	return areEqual;
+	}
+
+// TAction
+//--------
+TInt TAction::ExecuteActionL()
+	{
+	// Simply execute the action specified
+	switch(iAction)
+		{
+		case ENoAction:
+			return KErrNone;
+			//break;
+
+		case ELeaveAction:
+			User::Leave(iError);
+			break;
+
+		case EPanicAction:
+			User::Panic(KMessageInterceptPanic, iError);
+			break;
+
+		default:
+			return KErrArgument;
+			//break;
+		}
+
+	// For what its worth
+	return KErrNone;
+	}
+
+
+