securitydialogs/lockapp/src/lockapppubsubobserver.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 26 Jan 2010 15:20:08 +0200
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/*
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* Copyright (c) 2007 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:  Publish & Subscribe key observer
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 *
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*/
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#include "lockapppubsubobserver.h"
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#include "lockapputils.h"
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// ---------------------------------------------------------------------------
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// Two-phased constructor.
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// ---------------------------------------------------------------------------
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CLockAppPubSubObserver* CLockAppPubSubObserver::NewL(MLockAppObserverInterface* aObserver,
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        TUid aPubSubUid, TUint32 aKeyId )
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    {
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    CLockAppPubSubObserver* self = new (ELeave) CLockAppPubSubObserver(aObserver, aPubSubUid, aKeyId);
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    CleanupStack::PushL( self );
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    self->ConstructL( );
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    CleanupStack::Pop( self );
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    return self;
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    }
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// ---------------------------------------------------------------------------
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// C++ default constructor
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// ---------------------------------------------------------------------------
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CLockAppPubSubObserver::CLockAppPubSubObserver(MLockAppObserverInterface* aObserver,
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        TUid aPubSubUid, TUint32 aKeyId ) :
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    CActive( 0 ),
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    iObserver( aObserver ),
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    iPubSubUid( aPubSubUid ),
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    iKeyId( aKeyId ),
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    iValue( NULL )
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    {
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    }
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// ---------------------------------------------------------------------------
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// Destructor
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// ---------------------------------------------------------------------------
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CLockAppPubSubObserver::~CLockAppPubSubObserver( )
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    {
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    Cancel( );
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    iProperty.Close( );
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    }
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// ---------------------------------------------------------------------------
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// Symbian OS default constructor
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// ---------------------------------------------------------------------------
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void CLockAppPubSubObserver::ConstructL( )
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    {
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    // Add this active object to the scheduler.
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    CActiveScheduler::Add( this );
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    TInt err = iProperty.Attach( iPubSubUid, iKeyId );
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    ERROR_2(err, "CLockAppPubSubObserver::ConstructL - Property(%d,%d) attach", iPubSubUid, iKeyId);
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    User::LeaveIfError( err );
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    Start( );
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    }
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// ---------------------------------------------------------------------------
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// Starts listening
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// ---------------------------------------------------------------------------
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TInt CLockAppPubSubObserver::Start( )
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    {
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    if ( !IsActive( ) )
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        {
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        iStatus = KRequestPending;
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        iProperty.Subscribe( iStatus );
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        SetActive( );
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        return KErrNone;
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        }
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    else
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        {
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        return KErrInUse;
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        }
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    }
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// ---------------------------------------------------------------------------
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// Stops listening
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// ---------------------------------------------------------------------------
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void CLockAppPubSubObserver::Stop( )
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    {
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    if ( IsActive( ) )
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        {
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        Cancel( );
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        iProperty.Cancel( );
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        }
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    }
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// ---------------------------------------------------------------------------
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// Gets value of the key from P&S.
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// ---------------------------------------------------------------------------
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TInt CLockAppPubSubObserver::GetKeyValue(TInt& aValue )
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    {
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    RDebug::Printf( "%s %s (%u) 1=%x", __FILE__, __PRETTY_FUNCTION__, __LINE__, 1 );
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    return iProperty.Get( aValue );
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    }
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// ---------------------------------------------------------------------------
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// Sets a value for the key in P&S.
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// ---------------------------------------------------------------------------
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TInt CLockAppPubSubObserver::SetKeyValue(TInt aValue )
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    {
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    RDebug::Printf( "%s %s (%u) aValue=%x", __FILE__, __PRETTY_FUNCTION__, __LINE__, aValue );
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    return iProperty.Set( aValue );
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    }
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// ---------------------------------------------------------------------------
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// CLockAppPubSubObserver::RunL()
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// ---------------------------------------------------------------------------
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void CLockAppPubSubObserver::RunL( )
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    {
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    TInt value( NULL);
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    iProperty.Get( value );
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    if ( iValue != value )
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        {
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        // on value change
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        iValue = value;
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        if ( iObserver )
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            {
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            iObserver->HandlePubSubNotify( iPubSubUid, iKeyId, iValue );
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            }
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        }
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    // re-subscribe to events
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    Start( );
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    }
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// ---------------------------------------------------------------------------
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// Cancels event listening
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// ---------------------------------------------------------------------------
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void CLockAppPubSubObserver::DoCancel( )
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    {
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    iProperty.Cancel( );
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    }
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// End of file