sensorservices/sensorserver/src/server/sensrvchannelchangequeue.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 00:53:00 +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:  Channel change notifications queue implementation
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*
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*/
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#include "sensrvdefines.h"
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#include "sensrvtrace.h"
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#include "sensrvchannelchangequeue.h"
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// ---------------------------------------------------------------------------
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// 2-phase constructor
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// ---------------------------------------------------------------------------
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//
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CSensrvChannelChangeQueue* CSensrvChannelChangeQueue::NewL()
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    {
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    COMPONENT_TRACE( ( _L( "Sensor Server - CSensrvChannelChangeQueue::NewL()" ) ) );
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    CSensrvChannelChangeQueue* self = new( ELeave ) CSensrvChannelChangeQueue();
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    CleanupStack::PushL(self);
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    self->ConstructL();
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    CleanupStack::Pop(self); 
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    COMPONENT_TRACE( ( _L( "Sensor Server - CSensrvChannelChangeQueue::NewL - return 0x%x" ), self ) );
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    return self;
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    }
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// ---------------------------------------------------------------------------
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// C++ constructor
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// ---------------------------------------------------------------------------
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//
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CSensrvChannelChangeQueue::CSensrvChannelChangeQueue()
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    : iChangesList(_FOFF(TChannelChangeNotification,iLink)),
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      iChangesListIter(iChangesList)
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    {
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    COMPONENT_TRACE( ( _L( "Sensor Server - CSensrvChannelChangeQueue::CSensrvChannelChangeQueue()" ) ) );
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    // Nothing to do
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    COMPONENT_TRACE( ( _L( "Sensor Server - CSensrvChannelChangeQueue::CSensrvChannelChangeQueue - return" ) ) );
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    }
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// ---------------------------------------------------------------------------
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// 2nd phase of construction
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// ---------------------------------------------------------------------------
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//
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void CSensrvChannelChangeQueue::ConstructL()
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    {
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    COMPONENT_TRACE( ( _L( "Sensor Server - CSensrvChannelChangeQueue::ConstructL()" ) ) );
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    // Nothing to do
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    COMPONENT_TRACE( ( _L( "Sensor Server - CSensrvChannelChangeQueue::ConstructL - return" ) ) );
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    }
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// ---------------------------------------------------------------------------
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// Destructor
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// ---------------------------------------------------------------------------
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//
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CSensrvChannelChangeQueue::~CSensrvChannelChangeQueue()
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    {
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    COMPONENT_TRACE( ( _L( "Sensor Server - CSensrvChannelChangeQueue::~CSensrvChannelChangeQueue()" ) ) );
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    RemoveAll();
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    COMPONENT_TRACE( ( _L( "Sensor Server - CSensrvChannelChangeQueue::~CSensrvChannelChangeQueue - return" ) ) );
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    }
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// ---------------------------------------------------------------------------
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// Adds property to the end of the queue
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// ---------------------------------------------------------------------------
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//
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TInt CSensrvChannelChangeQueue::Append( const TSensrvChannelInfo& aChannelInfo,
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                                        TSensrvChannelChangeType aChangeType )
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    {
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    COMPONENT_TRACE( ( _L( "Sensor Server - CSensrvChannelChangeQueue::Append(Channel ID:%d)" ), aChannelInfo.iChannelId ) );
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    TInt err(KErrNone);
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    // Allocate linkable transaction pointer in same heap as queue
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    TChannelChangeNotification* newPtr = new TChannelChangeNotification();
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    if (newPtr)
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        {
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        newPtr->iChannelInfo = aChannelInfo;
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        newPtr->iChangeType = aChangeType;
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        iChangesList.AddLast(*newPtr);                
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        }
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    else
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        {
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        ERROR_TRACE( ( _L( "Sensor Server - CCSensrvChannelChangeQueue::Append - ERROR: No memory to add item" ) ) );
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        err = KErrNoMemory;
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        }
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    COMPONENT_TRACE( ( _L( "Sensor Server - CSensrvChannelChangeQueue::Append - return %d" ), err ) );
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    return err;
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    }
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// ---------------------------------------------------------------------------
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// Gets the first property
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// ---------------------------------------------------------------------------
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//
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CSensrvChannelChangeQueue::TChannelChangeNotification* CSensrvChannelChangeQueue::First()
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    {
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    COMPONENT_TRACE( ( _L( "Sensor Server - CSensrvChannelChangeQueue::First()" ) ) );
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    TChannelChangeNotification* ptr = NULL;
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    if (!iChangesList.IsEmpty())
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        {
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        ptr = iChangesList.First();
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        }
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    COMPONENT_TRACE( ( _L( "Sensor Server - CSensrvChannelChangeQueue::First - return %d" ), ptr ) );
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    return ptr;
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    }
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// ---------------------------------------------------------------------------
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// Remove the first property
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// ---------------------------------------------------------------------------
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//
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void CSensrvChannelChangeQueue::RemoveFirst()
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    {
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    COMPONENT_TRACE( ( _L( "Sensor Server - CSensrvChannelChangeQueue::RemoveFirst()" ) ) );
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    TChannelChangeNotification* ptr = NULL;
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    if (!iChangesList.IsEmpty())
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        {
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        ptr = iChangesList.First();
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        iChangesList.Remove(*ptr);
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        delete ptr;
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        }
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    COMPONENT_TRACE( ( _L( "Sensor Server - CSensrvChannelChangeQueue::RemoveFirst - return" ) ) );
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    }
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// ---------------------------------------------------------------------------
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// Remove all properties from queue
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// ---------------------------------------------------------------------------
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//
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void CSensrvChannelChangeQueue::RemoveAll()
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    {
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    COMPONENT_TRACE( ( _L( "Sensor Server - CSensrvChannelChangeQueue::RemoveAll()" ) ) );
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    if (!iChangesList.IsEmpty())
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        {
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        TChannelChangeNotification* ptr = NULL;
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        iChangesListIter.SetToFirst(); 
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        while ((ptr = iChangesListIter++) != NULL)
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            {        
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            iChangesList.Remove(*ptr);
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            delete ptr;
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            };
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        }
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    iChangesList.Reset();
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    }
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   180