datacommsserver/esockserver/MobilityCoreProviders/src/mobilitycpractivities.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 25 May 2010 14:00:39 +0300
branchRCL_3
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parent 28 9ddb1d67ebaf
permissions -rw-r--r--
Revision: 201021 Kit: 2010121
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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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// mobilityactivities.cpp
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// Mobility Connection Provider activity definitions.
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//
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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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#include <comms-infras/mobilitycpr.h>
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#include "mobilitycpractivities.h"
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#include <comms-infras/mobilitycprstates.h>
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#include <comms-infras/ss_coreprstates.h>
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#include <comms-infras/ss_nodemessages.h>
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#include <comms-infras/corecpractivities.h>
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#include <elements/nm_messages_errorrecovery.h>
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#ifdef _DEBUG
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// Panic category for "absolutely impossible!" vanilla ASSERT()-type panics from this module
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// (if it could happen through user error then you should give it an explicit, documented, category + code)
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_LIT(KSpecAssert_ESockMbCrCPRAct, "ESockMbCrCPRAct");
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#endif
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using namespace ESock;
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using namespace Messages;
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using namespace MeshMachine;
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using namespace NetStateMachine;
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using namespace MobilityCprActivities;
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using namespace MobilityCprStates;
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using namespace CorePanics;
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//
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//Panics
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#ifdef _DEBUG
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_LIT (KCoreMobileCprPanic,"CoreMobileCprPanic");
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#endif
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namespace CprMobilityActivity
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{
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/**
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	Activity responsible for interacting with the ESock client mobility extension
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	API and with the MCPR for the acceptance or rejection of requests to migrate
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	bearer.
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*/
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DECLARE_DEFINE_CUSTOM_NODEACTIVITY(ECFActivityCprMobility, MobilityCprMobility, TCFMobilityProvider::TStartMobility, CMobilityActivity::NewL)
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	FIRST_NODEACTIVITY_ENTRY(MobilityCprStates::TAwaitingStartMobility, MeshMachine::TNoTag)
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	// Attempt to start mobility activity on the meta plane
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	NODEACTIVITY_ENTRY(KNoTag, MobilityCprStates::TSendStartMobility, MobilityCprStates::TAwaitingMobilityStartedOrError, MeshMachine::TNoTagOrErrorTag)
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	// Success - complete the IPC client
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	THROUGH_NODEACTIVITY_ENTRY(KNoTag, CMobilityActivity::TCompleteMobilityClient, TTag<CMobilityActivity::KWaitForMobility>)
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	//<BEGIN> MAIN LOOP ****************
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	//Awaiting mobility triggers, which can either be:
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	//(1) TMigrationNotification (PreferredCarrierAvailable) coming from the control provider (presumably as a response to changing availability)
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	//(2) TMigrationRejected (NewCarrierRejected) coming from the control client (who's presumably not content with the currently offered carrier).
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	//(3) TError coming from the control provider in response to the previous rejection. The client rejected the current bearer, but there are no more bearers to offer.
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	NODEACTIVITY_ENTRY(CMobilityActivity::KWaitForMobility, MeshMachine::TDoNothing, MobilityCprStates::TAwaitingNewCarrierOrErrorOrRelayAndConsumeCurrentCarrierRejected, CMobilityActivity::TStartHandshakeOrErrorTagBlockedByClientNotReady)
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		// Notify the ESock client that a preferred carrier is available and await the client to respond
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		// The response may be:
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		// (1) TCFMobilityProvider::TMigrationRequested - proceed with the migration - the tuple will jump (with KNoTag) to await for the control provider to supply the new bearer.
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 		// (2) TCFMobilityProvider::TMigrationRejected - abort the migration - the tuple will jump (with KWaitForMobility | EBackaward) back to awaiting for the preferred bearer.
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 		// Note that TAwaitAndRelayMigrationRequestedOrMigrationRejected does the job of forwarding both messages to the control provider.
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		NODEACTIVITY_ENTRY(CMobilityActivity::KStartHandshake, CMobilityActivity::TNotifyClientPreferredCarrierAvailable, MobilityCprStates::TAwaitAndRelayMigrationRequestedOrMigrationRejected, CMobilityActivity::TNoTagOrWaitForMobilityBackwards)
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		//We've just told the control provider (see above: TAwaitAndRelayMigrationRequested...) that the offered carrier has been accepted - the client is requesting migration.
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		//The control provider may respond threefold:
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		//(1) TMigrationComplete - Proceed with the migration - the tuple will jump (with KNoTag) to starting of the bearer;
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		//(2) TMigrationNotification - offer another bearer (if the current one became out of date) - the tuple will jump back to the processing of the new bearer
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		//(3) TError - abort mobility if the current bearer is out of date and there are no more bearers to offer - the tuple will jump to the KErrorTag tuple who will decide what kind of error it is.
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		NODEACTIVITY_ENTRY(KNoTag, MeshMachine::TDoNothing, MobilityCprStates::TAwaitingMigrationCompleteOrNewCarrierOrError, MobilityCprStates::TNoTagOrStartHandshakeBackwardsOrError)
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		THROUGH_NODEACTIVITY_ENTRY(KErrorTag, CMobilityActivity::TCompleteMobilityClient, MeshMachine::TTag<CMobilityActivity::KWaitForMobility|EBackward>)
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		// Start the new connection
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		NODEACTIVITY_ENTRY(KNoTag, CoreNetStates::TStartServiceProvider, MobilityCprStates::TAwaitingStartedOrError, CMobilityActivity::TNoTagOrErrorTagBlockedByClientNotReady)
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		NODEACTIVITY_ENTRY(KErrorTag, TSendErrorRecoveryReq, MeshMachine::TAwaitingErrorRecoveryResponseOrError, CMobilityActivity::TNoTagBackwardsOrRecoverableErrorOrErrorBlockedByClientNotReady)
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        //If the bearer fails to start, the can be another bearer available, so we need to notify the control provider in case it can offer one.
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		//This node does that by rejecting the current bearer.
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		THROUGH_NODEACTIVITY_ENTRY(CoreStates::KRecoverableErrorTag, MobilityCprStates::TSendMigrationRejected, TTag<CMobilityActivity::KWaitForMobility|EBackward>)
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		THROUGH_NODEACTIVITY_ENTRY(KErrorTag, CMobilityActivity::TCompleteMobilityClient, MeshMachine::TTag<CMobilityActivity::KWaitForMobility|EBackward>)
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		NODEACTIVITY_ENTRY(KNoTag, CMobilityActivity::TNotifyClientNewCarrierActive, MobilityCprStates::TAwaitAndRelayMigrationAcceptedOrMigrationRejected, MeshMachine::TTag<CMobilityActivity::KWaitForMobility|EBackward>)
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		//<END> MAIN LOOP **************
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NODEACTIVITY_END()
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} // namespace CprMobilityActivity
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namespace MobilityCprActivities
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{
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DEFINE_EXPORT_ACTIVITY_MAP(mobilityCprActivities)
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	ACTIVITY_MAP_ENTRY(CprMobilityActivity, MobilityCprMobility)
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ACTIVITY_MAP_END_BASE(CprActivities, coreCprActivities)
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}
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//
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// CMobilityActivity
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CMobilityActivity::CMobilityActivity(const MeshMachine::TNodeActivity& aActivitySig, MeshMachine::AMMNodeBase& aNode)
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:	MeshMachine::CNodeRetryActivity(aActivitySig, aNode)
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	{
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	__ASSERT_DEBUG(static_cast<CMobilityConnectionProvider&>(iNode).iMobilityActivity == NULL, User::Panic(KCoreMobileCprPanic, KPanicActivity));
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	}
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CMobilityActivity::~CMobilityActivity()
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	{
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	//This pointer becomes invalid now, clear if still set.
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	static_cast<CMobilityConnectionProvider&>(iNode).iMobilityActivity = NULL;
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	CCommsApiExtResponder::Complete(iResponder, Error() ? Error() : KErrAbort); //Safe if NULL
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	SetError(KErrNone);
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	}
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MeshMachine::CNodeActivityBase* CMobilityActivity::NewL(const MeshMachine::TNodeActivity& aActivitySig, MeshMachine::AMMNodeBase& aNode)
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	{
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	CMobilityActivity* self = new(ELeave) CMobilityActivity(aActivitySig, aNode);
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	return self;
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	}
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void CMobilityActivity::SetResponder(ESock::CCommsApiExtResponder& aResponder)
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	{
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	__ASSERT_DEBUG(iResponder==NULL, User::Panic(KSpecAssert_ESockMbCrCPRAct, 7));
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	__ASSERT_DEBUG(&aResponder, User::Panic(KSpecAssert_ESockMbCrCPRAct, 8));
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	iResponder = &aResponder;
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	//CMobilityActivity::TMobilityClientNotReadyMutex may have CMobilityActivity await for
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	//iResponder to pop up and if it is waiting, we need to signal it.
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	TNodeNullContext context(iNode, this);
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	Signal(context);
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	}
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TBool CMobilityActivity::TMobilityClientNotReadyMutex::IsBlocked(MeshMachine::TNodeContextBase& aContext)
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	{
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	__ASSERT_DEBUG(aContext.iNodeActivity, User::Panic(KCoreMobileCprPanic, KPanicNoActivity));
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	CMobilityActivity& activity = static_cast<CMobilityActivity&>(*aContext.iNodeActivity);
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	return activity.iResponder? EFalse : ETrue;
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	}
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//Cpr::CMobilityActivity has no originators
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void CMobilityActivity::StartL(TNodeContextBase& aContext, const Messages::XNodePeerId& aOriginator, const TStateTriple& aFirst)
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	{
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	//This activity does not support multiple clients. Any subsequent client should be completed with KErrNotSupported
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	//from CMobilityConnectionProvider::OpenExtensionInterface().
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	__ASSERT_DEBUG(iOriginators.Count()==0, User::Panic(KSpecAssert_ESockMbCrCPRAct, 1));
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	MeshMachine::CNodeRetryActivity::StartL(aContext, aOriginator, aFirst);
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	TCFMobilityProvider::TStartMobility& msg = message_cast<TCFMobilityProvider::TStartMobility>(aContext.iMessage);
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	iResponder = static_cast<CCommsApiExtResponder*>(msg.iPtr);
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	iClientId = msg.iValue;
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	__ASSERT_DEBUG(msg.iValue != 0, User::Panic(KSpecAssert_ESockMbCrCPRAct, 2)); //Client id must be valid here.
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	//Set a pointer to the mobility activity in the node on which it's running
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	__ASSERT_DEBUG(static_cast<CMobilityConnectionProvider&>(iNode).iMobilityActivity == NULL, User::Panic(KSpecAssert_ESockMbCrCPRAct, 3));
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	static_cast<CMobilityConnectionProvider&>(iNode).iMobilityActivity = this;
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	}
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void CMobilityActivity::Cancel(TNodeContextBase& aContext)
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	{
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	RNodeInterface* cp = iNode.GetFirstClient<TDefaultClientMatchPolicy>(TClientType(TCFClientType::ECtrlProvider));
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	__ASSERT_DEBUG(cp, User::Panic(KSpecAssert_ESockMbCrCPRAct, 4)); //We are a Cpr, must exist.
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	//PostedTo() could be our service provider or possibly other peer
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	if (PostedToPeer() != cp)
0
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		{
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		cp->PostMessage(TNodeCtxId(ActivityId(), iNode.Id()),
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			TEBase::TCancel().CRef());
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		}
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	MeshMachine::CNodeRetryActivity::Cancel(aContext); //Send TCancel to iPostedTo
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	}
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DEFINE_SMELEMENT(CMobilityActivity::TNoTagBackwardsOrRecoverableErrorOrError, NetStateMachine::MStateFork, CMobilityActivity::TContext)
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TInt CMobilityActivity::TNoTagBackwardsOrRecoverableErrorOrError::TransitionTag()
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	{
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	if (iContext.iMessage.IsMessage<TEErrorRecovery::TErrorRecoveryResponse>())
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		{
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		TErrResponse& resp = message_cast<TEErrorRecovery::TErrorRecoveryResponse>(iContext.iMessage).iErrResponse;
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		if (resp.iAction == TErrResponse::ERetry)
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			{
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			iContext.Activity()->SetError(KErrNone);
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      		return KNoTag | NetStateMachine::EBackward;
0
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			}
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		else if  (resp.iAction == TErrResponse::EPropagate || resp.iError == KErrCancel)
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			{
2
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            if (resp.iError != KErrNone)
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                {
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                //The activity is already errored. The errored state needs to be reset first.
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                iContext.Activity()->SetError(KErrNone);
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                iContext.Activity()->SetError(resp.iError);
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                }
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0
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			return KErrorTag;
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			}
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		else if (resp.iAction == TErrResponse::EIgnore) // and or iError is KErrCancel
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			{
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			//TODO RZ: This looks inappropriate. EIgnore and EPropagate flags are not 
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			//really complimentary. They're simply invalid in soem scenarios.
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			//Here we use ignore to an activity that attempted error recovery,
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			//it technically cannot ignore the error. It will propagate it back
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			//to the MCPR (and not to the client) by rejecting the current bearer.
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			//It feels thought clearing the error doesn't belong here. It probably
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			//belongs to the error activity. 
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			iContext.Activity()->SetError(KErrNone);
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			return CoreStates::KRecoverableErrorTag;
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			}
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		}
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	return KNoTag;
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	}
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DEFINE_SMELEMENT(CMobilityActivity::TNoTagOrWaitForMobilityBackwards, NetStateMachine::MStateFork, CMobilityActivity::TContext)
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TInt CMobilityActivity::TNoTagOrWaitForMobilityBackwards::TransitionTag()
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	{
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	if(iContext.iMessage.IsMessage<TCFMobilityProvider::TMigrationRequested>())
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		{
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		return KNoTag;
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		}
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	else
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		{
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		__ASSERT_DEBUG(iContext.iMessage.IsMessage<TCFMobilityProvider::TMigrationRejected>(), User::Panic(KSpecAssert_ESockMbCrCPRAct, 6));
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		return CMobilityActivity::KWaitForMobility|EBackward;
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		}
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	}
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//Transitions
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DEFINE_SMELEMENT(CMobilityActivity::TCompleteMobilityClient, NetStateMachine::MStateTransition, CMobilityActivity::TContext)
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void CMobilityActivity::TCompleteMobilityClient::DoL()
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	{
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	__ASSERT_DEBUG(iContext.iNodeActivity, User::Panic(KCoreMobileCprPanic, KPanicNoActivity));
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	CMobilityActivity& activity = static_cast<CMobilityActivity&>(*iContext.iNodeActivity);
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	CCommsApiExtResponder::Complete(activity.iResponder, activity.Error());
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	//There is only one way to kill the mobility activity and it is by the client closing the API extension.
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	//This will be manifested with KErrCancel.
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	if (activity.Error() == KErrCancel)
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	    {
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	    activity.SetIdle();
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	    }
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	activity.SetError(KErrNone); //The error has been handled
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	activity.ClearPostedTo();
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	}
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DEFINE_SMELEMENT(CMobilityActivity::TNotifyClientPreferredCarrierAvailable, NetStateMachine::MStateTransition, CMobilityActivity::TContext)
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void CMobilityActivity::TNotifyClientPreferredCarrierAvailable::DoL()
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	{
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	__ASSERT_DEBUG(iContext.iNodeActivity, User::Panic(KCoreMobileCprPanic, KPanicNoActivity));
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	CMobilityActivity& activity = static_cast<CMobilityActivity&>(*iContext.iNodeActivity);
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	TCFMobilityControlClient::TMigrationNotification& msg = message_cast<TCFMobilityControlClient::TMigrationNotification>(iContext.iMessage);
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	activity.iCurrentAp = msg.iValue1;
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	activity.iPreferredAp = msg.iValue2;
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	activity.iIsUpgrade = msg.iValue3;
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	CCommsMobilitySrvResp* responder = static_cast<CCommsMobilitySrvResp*>(activity.iResponder);
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	activity.iResponder = NULL;
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	CCommsMobilitySrvResp::PreferredCarrierAvailable(responder, TAccessPointInfo(activity.iCurrentAp), TAccessPointInfo(activity.iPreferredAp), activity.iIsUpgrade, EFalse);
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	activity.ClearPostedTo();
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	}
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DEFINE_SMELEMENT(CMobilityActivity::TNotifyClientNewCarrierActive, NetStateMachine::MStateTransition, CMobilityActivity::TContext)
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void CMobilityActivity::TNotifyClientNewCarrierActive::DoL()
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	{
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	__ASSERT_DEBUG(iContext.iNodeActivity, User::Panic(KCoreMobileCprPanic, KPanicNoActivity));
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	CMobilityActivity& activity = static_cast<CMobilityActivity&>(*iContext.iNodeActivity);
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	CCommsMobilitySrvResp* responder = static_cast<CCommsMobilitySrvResp*>(activity.iResponder);
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	activity.iResponder = NULL;
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	CCommsMobilitySrvResp::NewCarrierActive(responder, TAccessPointInfo(activity.iPreferredAp), EFalse);
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	activity.ClearPostedTo();
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	}
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