author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 12 Mar 2010 15:42:44 +0200 | |
branch | RCL_3 |
changeset 11 | 71da52165949 |
parent 0 | 4e91876724a2 |
child 13 | bcb43dc84c44 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008-2009 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: Garbage collector |
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* |
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*/ |
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#include "glxgarbagecollector.h" |
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#include <glxassert.h> |
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#include <glxtracer.h> |
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#include <glxlog.h> |
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#include "glxcache.h" |
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#include "glxerrormanager.h" |
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#include "glxmedia.h" |
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#include "glxmedialist.h" |
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#include "mglxmediauser.h" |
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#include "glxthumbnailutility.h" |
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|
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/** |
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* Interval for the periodic timer, in microseconds |
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*/ |
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const TInt KPeriodicInterval = 500000; |
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/** |
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* Start Delay for the periodic timer, in microseconds |
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*/ |
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const TInt KPeriodicStartDelay = 300000; // It is Changed to 300Micro Second ; To be able to give Others a Chance to Run before it starts |
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/** |
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* Max number of items to scan per periodic callback |
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* @todo Find optimal value for this |
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*/ |
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const TInt KMaxScannedMediaCountPerPeriodicCallback = 15; // Changed from 30; Still there is Scope for Nominal Value Or Dynamic Value |
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|
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/** |
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* Max number of attributes that an item may have in use |
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*/ |
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const TInt KMaxAttributesInUse = 50; |
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// ----------------------------------------------------------------------------- |
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// NewL |
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// ----------------------------------------------------------------------------- |
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// |
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CGlxGarbageCollector* CGlxGarbageCollector::NewL( |
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const RPointerArray<CGlxCache>& aCaches ) |
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{ |
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TRACER( "CGlxGarbageCollector::NewL" ); |
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CGlxGarbageCollector* self = new( ELeave ) CGlxGarbageCollector( aCaches ); |
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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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// Constructor |
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// ----------------------------------------------------------------------------- |
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// |
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CGlxGarbageCollector::CGlxGarbageCollector( |
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const RPointerArray<CGlxCache>& aCaches ) |
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: iCaches( aCaches ) |
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{ |
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TRACER("CGlxGarbageCollector::Default Constructor"); |
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} |
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// ----------------------------------------------------------------------------- |
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// ConstructL |
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// ----------------------------------------------------------------------------- |
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// |
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void CGlxGarbageCollector::ConstructL() |
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{ |
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TRACER("CGlxGarbageCollector::ConstructL"); |
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|
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// Create callback loop in the lowest priority, so that the garbage |
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// collection does not slow down the application |
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iPeriodic = CPeriodic::NewL( CActive::EPriorityIdle ); |
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iAttributesInUse.ReserveL(KMaxAttributesInUse); |
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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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CGlxGarbageCollector::~CGlxGarbageCollector() |
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{ |
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TRACER("CGlxGarbageCollector::Destructor"); |
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delete iPeriodic; |
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iAttributesInUse.Close(); |
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} |
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104 |
|
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// ----------------------------------------------------------------------------- |
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// CleanupL |
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// ----------------------------------------------------------------------------- |
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// |
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void CGlxGarbageCollector::CleanupL() |
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{ |
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TRACER("CGlxGarbageCollector::CleanupL"); |
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112 |
|
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if ( !iPeriodic->IsActive() ) |
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114 |
{ |
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iPeriodic->Start( KPeriodicStartDelay, KPeriodicInterval, TCallBack( &PeriodicCallbackL, static_cast<TAny*>( this ) ) ); |
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} |
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else |
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118 |
{ |
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// a full cleanup round is required to make the cache fully clean, |
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// if cleanup is currently ongoing. we don't know whether the cache |
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// was modified before or after the current (cache or media) index being |
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// cleaned up. |
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iRequiresFullCleanupRound = ETrue; |
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} |
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} |
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126 |
|
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// ----------------------------------------------------------------------------- |
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// CancelCleanup |
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// ----------------------------------------------------------------------------- |
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130 |
// |
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void CGlxGarbageCollector::CancelCleanup() |
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132 |
{ |
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TRACER("CGlxGarbageCollector::CancelCleanup"); |
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134 |
|
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if (iPeriodic->IsActive()) |
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136 |
{ |
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iPeriodic->Cancel(); |
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// Consideration of Restarting the timer is there; |
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} |
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140 |
} |
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141 |
|
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142 |
// ----------------------------------------------------------------------------- |
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// Callback from periodic timer |
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// ----------------------------------------------------------------------------- |
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145 |
// |
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TInt CGlxGarbageCollector::PeriodicCallbackL( TAny* aPtr ) |
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147 |
{ |
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TRACER("CGlxGarbageCollector::PeriodicCallback"); |
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149 |
|
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GLX_ASSERT_DEBUG( aPtr != NULL, Panic( EGlxPanicLogicError ), |
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"Received null pointer for garbage collector" ); |
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152 |
|
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// get "this" pointer |
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static_cast< CGlxGarbageCollector* >( aPtr )->PeriodicCallbackL(); |
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155 |
|
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// return value ignored for periodic timers |
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return 0; |
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} |
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159 |
|
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// ----------------------------------------------------------------------------- |
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// Flush Count Pages |
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// ----------------------------------------------------------------------------- |
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// |
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void CGlxGarbageCollector::FlushPagesL(TInt aCount) |
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165 |
{ |
11
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TRACER("CGlxGarbageCollector::FlushPagesL"); |
0
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TBool reachedEnd = CleanupCaches(aCount); |
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168 |
|
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if ( reachedEnd ) |
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170 |
{ |
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// reset to the start of the caches |
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iScanningPosition.iCurrentCacheIndex = 0; |
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iScanningPosition.iNextMediaIndexToCleanup = 0; |
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174 |
|
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// next time the full round reaches end, the caches will be fully clean |
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// (unless client calls Cleanup() ) |
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iRequiresFullCleanupRound = EFalse; |
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} |
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} |
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// ----------------------------------------------------------------------------- |
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// Callback from periodic timer |
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// inlined in cpp only => inlines for arm |
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// ----------------------------------------------------------------------------- |
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// |
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inline void CGlxGarbageCollector::PeriodicCallbackL() |
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{ |
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TRACER("CGlxGarbageCollector::PeriodicCallbackL"); |
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188 |
|
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TBool reachedEnd = CleanupCaches(); |
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190 |
|
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// determine whether idle callback should be cancelled (note that check |
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// needs to be done before resetting iRequiresFullCleanupRound below) |
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// do not cancel if reached the end, but cache is dirty |
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if ( reachedEnd && !iRequiresFullCleanupRound ) |
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195 |
{ |
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iPeriodic->Cancel(); |
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197 |
} |
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198 |
|
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// if scanned to the end of caches, set up for the next cleanup round |
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if ( reachedEnd ) |
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201 |
{ |
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// reset to the start of the caches |
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iScanningPosition.iCurrentCacheIndex = 0; |
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iScanningPosition.iNextMediaIndexToCleanup = 0; |
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205 |
|
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// next time the full round reaches end, the caches will be fully clean |
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// (unless client calls Cleanup() ) |
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208 |
iRequiresFullCleanupRound = EFalse; |
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} |
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} |
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211 |
|
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// ----------------------------------------------------------------------------- |
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// Clean up all caches |
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// ----------------------------------------------------------------------------- |
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// |
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TBool CGlxGarbageCollector::CleanupCaches(TInt aCount) |
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217 |
{ |
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TRACER( "CGlxGarbageCollector::CleanupCaches" ); |
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219 |
|
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TInt remainingScanCount = 0; |
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221 |
|
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// set the maximum number of items to scan during this call |
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// Count is Needed for Flushing Direct |
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remainingScanCount = aCount*KMaxScannedMediaCountPerPeriodicCallback; |
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225 |
|
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// Iterate through all cache until scanned enough items (remainingScanCount) |
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// (unlikely to have many caches, so ok to call RPointerArray::Count() on |
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// each iteration) |
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while ( iScanningPosition.iCurrentCacheIndex < iCaches.Count() ) |
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230 |
{ |
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// clean up current cache |
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remainingScanCount = CleanupCache( |
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*iCaches[iScanningPosition.iCurrentCacheIndex], remainingScanCount ); |
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234 |
|
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// exit the loop if reached full scan count, since the above loop might |
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// have reached the end of the cache. (so don't increment the current |
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// cache index) |
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if ( 0 == remainingScanCount ) |
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239 |
{ |
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break; |
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} |
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242 |
|
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// set indexes to the beginning of the next cache |
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iScanningPosition.iCurrentCacheIndex++; |
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iScanningPosition.iNextMediaIndexToCleanup = 0; |
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} |
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247 |
|
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// determine if there is anything more to clean up |
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TBool reachedEndOfAllCaches = |
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( iScanningPosition.iCurrentCacheIndex == iCaches.Count() ); |
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return reachedEndOfAllCaches; |
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} |
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253 |
|
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// ----------------------------------------------------------------------------- |
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// Clean up cache that is currently under cleanup |
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// return number of items yet to scan during this idle callback |
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// ----------------------------------------------------------------------------- |
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// |
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TInt CGlxGarbageCollector::CleanupCache( CGlxCache& aCache, |
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TInt aRemainingScanCount ) |
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261 |
{ |
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TRACER( "CGlxGarbageCollector::CleanupCache" ); |
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263 |
|
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// set the maximum number of items to scan during this call |
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TInt remainingScanCount = aRemainingScanCount; |
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266 |
|
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// don't store cache.Count() locally, as the count changes during the loop |
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while ( iScanningPosition.iNextMediaIndexToCleanup < aCache.Count() && |
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remainingScanCount > 0 && ( aCache.IdSpaceId() != KGlxIdSpaceIdRoot ) ) |
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270 |
{ |
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CGlxMedia& media = aCache.Media( iScanningPosition.iNextMediaIndexToCleanup ); |
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272 |
|
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if ( media.UserCount() > 0 ) |
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274 |
{ |
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// the media object still has users. Check if any attributes |
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// it has can be deleted. |
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TRAPD( err, CleanupMediaL( aCache, media ) ); |
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|
278 |
|
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// skip the media object if cleanup failed. This allows cleanup to |
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// continue also when has no free memory. Skip also if there |
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// are still attributes in use. |
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if ( ( media.Count() == 0 && !err ) || ( err > 0 ) ) |
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|
283 |
{ |
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// the media object has no more attributes. It can be deleted. |
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// don't increment iNextMediaIndexToCleanup since the index |
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// of the next item will be decreased by one due to removal |
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aCache.Delete( iScanningPosition.iNextMediaIndexToCleanup ); |
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GLX_LOG_INFO1( "CGlxGarbageCollector - Deleted Media Id=%d since no attributes left", media.Id().Value()); |
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289 |
} |
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else if( err < 0 ) |
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291 |
{ |
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// scan next item |
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iScanningPosition.iNextMediaIndexToCleanup++; |
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294 |
} |
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295 |
else |
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296 |
{ |
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297 |
// scan next item |
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298 |
iScanningPosition.iNextMediaIndexToCleanup++; |
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299 |
} |
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300 |
} |
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301 |
else |
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|
302 |
{ |
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303 |
// the media object has no more users in present cache. It may be deleted |
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304 |
if( !MediaInUse( media ) ) |
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305 |
{ |
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306 |
// Bug Fix @ EDDG-7V3CJA:: Recheck other caches for UserCount |
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|
307 |
aCache.Delete( iScanningPosition.iNextMediaIndexToCleanup ); |
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|
308 |
GLX_LOG_INFO1( "CGlxGarbageCollector - Deleted Media Id=%d since no users left", media.Id().Value()); |
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309 |
} |
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310 |
} |
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311 |
remainingScanCount--; |
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} |
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313 |
|
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return remainingScanCount; |
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} |
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316 |
|
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// ----------------------------------------------------------------------------- |
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// Perform cleanup on provided media object |
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// ----------------------------------------------------------------------------- |
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320 |
// |
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void CGlxGarbageCollector::CleanupMediaL( CGlxCache& aCache, CGlxMedia& aMedia ) |
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322 |
{ |
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TRACER("CGlxGarbageCollector::CleanupMediaL"); |
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324 |
|
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// check which attributes can be deleted. |
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iAttributesInUse.Reset(); |
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327 |
|
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GetAttributesInUseL( aMedia, iAttributesInUse ); |
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if ( iAttributesInUse.Count() == 0 ) |
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330 |
{ |
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User::Leave(1); |
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332 |
} |
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GlxErrorManager::ClearExpiredAndUnusedErrorsL( aMedia, iAttributesInUse ); |
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334 |
|
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// add the error attribute to the list of attributes that are in use, so |
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// that it won't be deleted by the loop below. |
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// (if there are no errors left, GlxErrorManager::ClearExpiredAndNotInUseErrorsL |
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// would have deleted the error attribute from aMedia, so checking for it |
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// does no harm) |
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iAttributesInUse.AppendL( GlxErrorManager::ErrorAttribute() ); |
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341 |
|
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// delete all attributes that are not being used |
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DeleteOtherAttributes( aCache, aMedia, iAttributesInUse ); |
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344 |
} |
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345 |
|
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346 |
// ----------------------------------------------------------------------------- |
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347 |
// GetAttributesInUseL |
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348 |
// ----------------------------------------------------------------------------- |
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349 |
// |
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void CGlxGarbageCollector::GetAttributesInUseL( const CGlxMedia& aMedia, |
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RArray<TMPXAttribute>& aAttributes ) const |
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352 |
{ |
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TRACER("CGlxGarbageCollector::GetAttributesInUseL"); |
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354 |
|
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// get needed attributes from each user of the media object |
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// ( unlikely to have many users, so calling CGlxMedia::UserCount and |
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// CGlxMedia::Id within the loop ) |
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for ( TInt userIndex = 0; userIndex < aMedia.UserCount(); userIndex++ ) |
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359 |
{ |
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aMedia.User( userIndex ).GetRequiredAttributesL( aMedia.IndexInUser( userIndex ), |
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361 |
aAttributes ); |
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362 |
} |
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363 |
} |
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364 |
|
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365 |
// ----------------------------------------------------------------------------- |
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// Delete all attributes from a media object except those specified |
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367 |
// ----------------------------------------------------------------------------- |
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368 |
// |
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369 |
void CGlxGarbageCollector::DeleteOtherAttributes( CGlxCache& aCache, CGlxMedia& aMedia, |
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const RArray<TMPXAttribute>& aAttributesToKeep ) const |
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371 |
{ |
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TRACER("CGlxGarbageCollector::DeleteOtherAttributes"); |
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373 |
|
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// loop backwards so can delete attributes during the loop |
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for ( TInt attrIndex = aMedia.Count() - 1; attrIndex >= 0; attrIndex-- ) |
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376 |
{ |
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// delete the attribute if it is not in use |
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const TMPXAttribute& attrib = aMedia.Attribute(attrIndex); |
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379 |
if ( KErrNotFound == aAttributesToKeep.Find( attrib, TMPXAttribute::Match ) ) |
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|
380 |
{ |
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381 |
GLX_LOG_INFO( "CGlxGarbageCollector::DeleteOtherAttributes() - Deleted attribute" ); |
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|
382 |
aMedia.DeleteAttribute( attrIndex ); |
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|
383 |
if (GlxThumbnailUtility::IsFullThumbnail(attrib)) |
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|
384 |
{ |
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385 |
GLX_DEBUG2("CGlxGarbageCollector::DeleteOtherAttributes(*** TN ***) aMediaId(%d)", |
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|
386 |
aMedia.Id().Value()); |
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|
387 |
aCache.CleanupMedia(aMedia.Id()); |
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|
388 |
} |
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|
389 |
} |
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|
390 |
} |
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|
391 |
} |
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|
392 |
|
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|
393 |
// ----------------------------------------------------------------------------- |
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|
394 |
// Check for User Count for media to be deleted in the remaining caches |
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|
395 |
// ----------------------------------------------------------------------------- |
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|
396 |
// |
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|
397 |
TBool CGlxGarbageCollector::MediaInUse(const CGlxMedia& aMedia) const |
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|
398 |
{ |
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|
399 |
// Bug Fix @ EDDG-7V3CJA :: If media has non zero user count in any of the caches |
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|
400 |
// then deletion of texture is to be avoided. |
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|
401 |
for(TInt cacheCount = 0; cacheCount < iCaches.Count(); cacheCount++ ) |
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|
402 |
{ |
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|
403 |
if ( ( iCaches[cacheCount]->Media( aMedia.Id() ) ) |
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|
404 |
&& ( iCaches[cacheCount]->IdSpaceId() != KGlxIdSpaceIdRoot ) ) |
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|
405 |
{ |
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|
406 |
if ( ( iCaches[cacheCount]->Media(aMedia.Id() ) )->UserCount() > 0 ) |
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|
407 |
{ |
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|
408 |
return ETrue; |
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|
409 |
} |
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|
410 |
} |
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|
411 |
} |
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|
412 |
return EFalse; |
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|
413 |
} |