inc/CPEngNWSessionSlotNotifier2.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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/*
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* Copyright (c) 2004 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:  Notifier API to listen NWSessionSlot changes.
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*
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*/
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#ifndef __CPENGNWSESSIONSLOTNOTIFIER2_H
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#define __CPENGNWSESSIONSLOTNOTIFIER2_H
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//  INCLUDES
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#include <E32Base.h>
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#include <PEngPresenceEngineConsts2.h>
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// FORWARD DECLARATIONS
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class MPEngNWSessionSlotObserver2;
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class CPEngNWSessionSlotNotifier2Imp;
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class CPEngNWSessionSlotID2;
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// CLASS DECLARATION
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/**
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 * Notifier to receive notifications from
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 * NWSessionSlot events and state changes.
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 *
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 * Notifies from:
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 *  - creation / removal of NWSessionSlots
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 *  - individual NWSessionSlots events
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 *
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 * For full list of notified events,
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 * see TPEngNWSessionSlotEvent enumeration.
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 *
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 * @lib PEngManager2.lib
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 * @since 3.0
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 */
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class CPEngNWSessionSlotNotifier2 : public CBase
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    {
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        //-----------------------------------------------------------------------
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    public: /* Construction */
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        /**
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         * Instantiates NWSessionSlotNotifier object.
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         *
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         * Instantiates NWSessionSlotNotifier object and connects it to
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         * PresenceEngine subsystem. If needed PresenceEngine servers
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         * aren't yet running, starts those before returning.
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         *
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         * @param aPriority The priority for
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         * CPEngNWSessionSlotNotifier2 client side active objects.
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         * These active objects are used asynhronously deliver
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         * events to observers.
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         *
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         * @return New CPEngNWSessionSlotNotifier2 instance.
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         */
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        IMPORT_C static CPEngNWSessionSlotNotifier2* NewL(
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            TInt aPriority = CActive::EPriorityStandard );
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        IMPORT_C static CPEngNWSessionSlotNotifier2* NewLC(
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            TInt aPriority = CActive::EPriorityStandard );
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        /**
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         * Destructor.
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         * Virtual by CBase.
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         *
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         * Destruction
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         *  - stops automaticly event notification
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         *  - unregisters observers
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         */
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        ~CPEngNWSessionSlotNotifier2();
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    private:
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        CPEngNWSessionSlotNotifier2();
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        //-----------------------------------------------------------------------
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    public: /* NWSessionSlot notifications */
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        /**
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         * Starts delivering NWSessionSlot notifications.
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         *
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         * Reports either notifications from all NWSessionSlot
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         * events or only those events which match given criterias.
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         *
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         * Possible criterias are:
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         *  - NWSessionSlotID:
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         *    Reports only those events which NWSessionSlotID
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         *    matches given criteria. Match pattern can be
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         *    full NWSessionSlotID or wild one.
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         *
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         *  - SlotEvent:
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         *    Reports only those events which are requested.
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         *
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         * @param aMatchPattern The NWSessionSlotID match pattern to use.
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         * @param aEvents The events to deliver
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         * @return Result:
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         *  - KErrNone if succesfully started
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         *  - KErrArgument if empty criterias provided
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         *  - KErrInUse if notifier already started
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         *  - Else one of system wide error codes
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         */
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        IMPORT_C TInt Start();
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        IMPORT_C TInt Start( const CPEngNWSessionSlotID2& aMatchPattern );
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        IMPORT_C TInt Start( const TArray<TPEngNWSessionSlotEvent>& aEvents );
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        /**
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         * Stops listening sessions slot changes.
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         */
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        IMPORT_C void Stop();
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        /**
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         * Checks is the slot notifier started or not.
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         *
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         * @return ETrue if the slot notifier is already started.
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         *         EFalse if the slot notifier isn't started.
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         */
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        IMPORT_C TBool IsActive() const;
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        //-----------------------------------------------------------------------
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    public: /* NWSessionSlot notifications */
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        /**
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         * Notifies synchronously registered observers
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         * from NWSessionSlot states.
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         *
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         * State notifications are delivered synchronously from all
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         * NWSessionSlots which NWSessionSlotID matches given criteria.
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         * Match string can be full NWSessionSlotID or wild one.
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         * If no matching NWSessionSlot found, returns KErrNotFound.
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         *
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         * Only NWSessionSlot state information is delivered.
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         * Dynamic event and data parts are delivered as empty.
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         *
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         * @param aMatchPattern The NWSessionSlotID match pattern to use.
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         * @return Result:
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         *  - KErrNone if succesfully notified observers
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         *  - KErrNotFound if no matching NWSessionSlot found
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         *  - Else one of system wide error codes
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         */
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        IMPORT_C TInt PushNWSessionSlotStateToObservers(
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            const CPEngNWSessionSlotID2& aMatchPattern );
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        /**
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         * Gets NWSessionSlots state.
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         *
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         * @since 3.0
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         * @param aNWSessionSlotID The session slot ID to identify the
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         * session slot.
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         * @param aState Last state reported from NWSessionSlot.
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         * @return  Result:
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         *  - KErrNone if state succesfully get.
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         *  - Else one of system wide error codes.
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         */
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        IMPORT_C TInt GetNWSessionSlotState(
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            const CPEngNWSessionSlotID2& aNWSessionSlotID,
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            TPEngNWSessionSlotState& aState ) const;
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        //-----------------------------------------------------------------------
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    public: /* NWSessionSlot event observers */
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        /**
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         * Registers event observer to be notified from slot changes.
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         *
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         * Registered event observers are notified from
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         * NWSessionSlot events as requested with StartL().
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         *
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         * @param aObserver The observer to be notified.
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         * @return KErrNone is observer added succesfully.
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         *         Else one of the system wide error codes.
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         */
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        IMPORT_C TInt AddObserver(
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            MPEngNWSessionSlotObserver2& aObserver );
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        /**
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         * Unregisters session slot event observer.
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         *
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         * @param aObserver The observer to remove.
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         * @return KErrNone is observer removed succesfully.
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         *         KErrNotFound if the observer wasn't registered.
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         */
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        IMPORT_C TInt RemoveObserver(
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            MPEngNWSessionSlotObserver2& aObserver );
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        //-----------------------------------------------------------------------
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    private: /* Data */
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        //OWN: Implementation
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        CPEngNWSessionSlotNotifier2Imp*     iImp;
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    };
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#endif //__CPENGNWSESSIONSLOTNOTIFIER2_H
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//End of file
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