author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 10:12:17 +0200 | |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2002 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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* Fixed-size cache of TPbkContactEntry instances |
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* |
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*/ |
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|
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|
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// INCLUDE FILES |
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#include "CPbkEntryCache.h" |
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#include "CPbkContactEngine.h" |
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#include "CPbkContactItem.h" |
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#include <MPbkContactNameFormat.h> |
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|
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// MACROS |
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#ifdef _DEBUG |
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#define DEBUG_INC(var) ++(var) |
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#else |
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#define DEBUG_INC(var) |
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#endif |
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/// Unnamed namespace for local definitions |
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namespace { |
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// LOCAL CONSTANTS AND MACROS |
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#ifdef _DEBUG |
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enum TPanicCode |
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{ |
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EPanicPostCond_Constructor = 1, |
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EPanicPreCond_ConstructL, |
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EPanicPostCond_ConstructL, |
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EPanicPostCond_GetEntryL, |
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EPanicPostCond_PreLoadL, |
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EPanicPostCond_Find, |
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EPanicInvariant1, |
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EPanicInvariant2, |
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EPanicInvariant3, |
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EPanicInvariant4 |
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}; |
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void Panic(TInt aReason) |
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{ |
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_LIT(KPanicText, "CPbkEntryCache"); |
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User::Panic(KPanicText, aReason); |
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} |
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#endif // _DEBUG |
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} // namespace |
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// ==================== MEMBER FUNCTIONS ==================== |
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inline CPbkEntryCache::CPbkEntryCache |
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(CPbkContactEngine& aEngine) : |
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iEntryQueue(_FOFF(TEntry,iLink)), |
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iEngine(aEngine) |
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// Other members are reset by CBase::operator new |
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{ |
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iEntryLoader = this; |
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__ASSERT_DEBUG(!iEntries && iEntryLoader, |
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Panic(EPanicPostCond_Constructor)); |
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} |
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inline void CPbkEntryCache::ConstructL |
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(TInt aCapacity) |
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{ |
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__ASSERT_DEBUG(aCapacity > 0, Panic(EPanicPreCond_ConstructL)); |
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__ASSERT_DEBUG(!iEntries, Panic(EPanicPreCond_ConstructL)); |
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// Allocate one array block with all the cache entries |
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iEntries = new(ELeave) TEntry[aCapacity]; |
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iCapacity = aCapacity; |
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// Enqueue entries |
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TEntry* const end = iEntries + iCapacity; |
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for (TEntry* entry=iEntries; entry!=end; ++entry) |
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{ |
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iEntryQueue.AddLast(*entry); |
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} |
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__ASSERT_DEBUG(iEntries, Panic(EPanicPostCond_ConstructL)); |
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__ASSERT_DEBUG(iCapacity == aCapacity, Panic(EPanicPostCond_ConstructL)); |
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__TEST_INVARIANT; |
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} |
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EXPORT_C CPbkEntryCache* CPbkEntryCache::NewL |
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(CPbkContactEngine& aEngine, |
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TInt aCapacity) |
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{ |
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CPbkEntryCache* self = new(ELeave) CPbkEntryCache(aEngine); |
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CleanupStack::PushL(self); |
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self->ConstructL(aCapacity); |
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CleanupStack::Pop(self); |
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return self; |
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} |
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107 |
|
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CPbkEntryCache::~CPbkEntryCache() |
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109 |
{ |
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__TEST_INVARIANT; |
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for (TInt i = iCapacity-1; i >= 0; --i) |
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112 |
{ |
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iEntries[i].iEntry.Destroy(); |
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} |
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delete [] iEntries; |
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} |
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117 |
|
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EXPORT_C TInt CPbkEntryCache::Capacity() const |
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{ |
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__TEST_INVARIANT; |
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return iCapacity; |
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} |
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123 |
|
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EXPORT_C const TPbkContactEntry& CPbkEntryCache::GetEntryL |
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(TContactItemId aId) |
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126 |
{ |
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__TEST_INVARIANT; |
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128 |
|
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TPbkContactEntry* entry = Find(aId); |
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if (!entry) |
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131 |
{ |
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TEntry* victim = iEntryQueue.Last(); |
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entry = &victim->iEntry; |
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iEntryLoader->LoadEntryL(*entry, iEngine, aId); |
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Touch(*victim); |
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DEBUG_INC(iPerfStats.iMissCount); |
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} |
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138 |
else |
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139 |
{ |
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DEBUG_INC(iPerfStats.iHitCount); |
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141 |
} |
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142 |
|
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143 |
__TEST_INVARIANT; |
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__ASSERT_DEBUG(entry == DebugFind(aId), Panic(EPanicPostCond_GetEntryL)); |
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return (*entry); |
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146 |
} |
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147 |
|
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EXPORT_C void CPbkEntryCache::PreloadL |
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(TContactItemId aId) |
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150 |
{ |
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__TEST_INVARIANT; |
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152 |
|
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if (!Find(aId)) |
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154 |
{ |
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TEntry* victim = iEntryQueue.Last(); |
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iEntryLoader->LoadEntryL(victim->iEntry, iEngine, aId); |
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Touch(*victim); |
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DEBUG_INC(iPerfStats.iMissCount); |
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} |
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160 |
else |
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161 |
{ |
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DEBUG_INC(iPerfStats.iHitCount); |
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163 |
} |
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164 |
|
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__ASSERT_DEBUG(DebugFind(aId), Panic(EPanicPostCond_PreLoadL)); |
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__TEST_INVARIANT; |
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} |
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168 |
|
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EXPORT_C void CPbkEntryCache::Unload |
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(TContactItemId aId) |
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171 |
{ |
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__TEST_INVARIANT; |
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173 |
|
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TEntry* entry = FindEntry(aId); |
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if (entry) |
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176 |
{ |
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entry->iEntry.Reset(); |
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// Move entry to the end of the queue |
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entry->iLink.Deque(); |
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iEntryQueue.AddLast(*entry); |
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} |
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} |
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183 |
|
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EXPORT_C void CPbkEntryCache::Flush() |
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185 |
{ |
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TEntry* const end = iEntries + iCapacity; |
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for (TEntry* entry = iEntries; entry != end; ++entry) |
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188 |
{ |
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entry->iEntry.Reset(); |
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} |
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191 |
} |
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192 |
|
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193 |
void CPbkEntryCache::LoadEntryL |
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(TPbkContactEntry& aEntry, |
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CPbkContactEngine& aEngine, |
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TContactItemId aContactId) |
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197 |
{ |
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CPbkContactItem* contact = aEngine.ReadMinimalContactLC(aContactId); |
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199 |
|
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200 |
// Reserve space for name |
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MPbkContactNameFormat& nameFormatter = aEngine.ContactNameFormat(); |
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const TInt titleLength = nameFormatter.ContactListTitleLength(*contact); |
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aEntry.ReserveNameMaxLengthL(titleLength); |
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204 |
|
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// Get the contact icon id |
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const TPbkIconId iconId = contact->ContactIconIdL(); |
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207 |
|
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// All resources have been pre-allocated -> assign data |
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aEntry.SetContactItemId(aContactId); |
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if (titleLength > 0) |
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{ |
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TPtr namePtr = aEntry.NameBuf(); |
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nameFormatter.GetContactListTitle(*contact,namePtr); |
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} |
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else |
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{ |
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aEntry.ResetName(); |
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} |
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aEntry.SetIconId(iconId); |
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|
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// Cleanup |
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CleanupStack::PopAndDestroy(contact); |
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} |
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224 |
|
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/** |
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* Returns a cache entry if present, NULL otherwise. |
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*/ |
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TPbkContactEntry* CPbkEntryCache::Find |
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(TContactItemId aId) |
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{ |
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__TEST_INVARIANT; |
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232 |
|
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TPbkContactEntry* entry = NULL; |
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TEntry* queueEntry = FindEntry(aId); |
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if (queueEntry) |
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{ |
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// Entry found |
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Touch(*queueEntry); |
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entry = &(queueEntry->iEntry); |
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} |
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241 |
|
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__ASSERT_DEBUG(!entry || |
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(entry->ContactId()==aId && (&(iEntryQueue.First()->iEntry) == entry)), |
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Panic(EPanicPostCond_Find)); |
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__TEST_INVARIANT; |
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return entry; |
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} |
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248 |
|
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/** |
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* Call when an entry is accessed (="touched"). Increases the entry's priority |
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* for keeping it in this cache. |
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*/ |
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void CPbkEntryCache::Touch(TEntry& aEntry) |
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{ |
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aEntry.iLink.Deque(); |
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iEntryQueue.AddFirst(aEntry); |
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} |
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|
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CPbkEntryCache::TEntry* CPbkEntryCache::FindEntry |
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(TContactItemId aId) const |
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{ |
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// Search the cache brute-force. Searching in usage order using |
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// iEntryQueue is probably slower in modern cached processors due to |
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// nonlocality of access. |
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TEntry* const end = iEntries + iCapacity; |
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for (TEntry* entry = iEntries; entry != end; ++entry) |
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{ |
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if (entry->iEntry.ContactId() == aId) |
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269 |
{ |
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return entry; |
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} |
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} |
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return NULL; |
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} |
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275 |
|
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#ifdef _DEBUG |
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277 |
|
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const TPbkContactEntry* CPbkEntryCache::DebugFind |
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(TContactItemId aId) const |
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{ |
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const TPbkContactEntry* entry = NULL; |
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const TEntry* queueEntry = FindEntry(aId); |
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if (queueEntry) |
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{ |
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entry = &(queueEntry->iEntry); |
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} |
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return entry; |
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} |
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289 |
|
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void CPbkEntryCache::__DbgTestInvariant() const |
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{ |
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if (!iEntries) |
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293 |
{ |
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// Partial construction |
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return; |
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} |
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|
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__ASSERT_ALWAYS(iCapacity > 0, Panic(EPanicInvariant1)); |
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299 |
|
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TInt count = 0; |
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TDblQueIter<TEntry> iter(CONST_CAST(CPbkEntryCache*,this)->iEntryQueue); |
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const TEntry* queueEntry; |
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while (TInt(queueEntry = iter++)) |
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{ |
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++count; |
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// Each entry should be in iEntries array |
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__ASSERT_ALWAYS(queueEntry >= iEntries && |
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queueEntry < iEntries+iCapacity, |
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Panic(EPanicInvariant2)); |
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} |
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311 |
|
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// All the entries should be in the queue |
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__ASSERT_ALWAYS(count == iCapacity, Panic(EPanicInvariant3)); |
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314 |
|
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// There should not be duplicate non-null entries |
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for (TInt i=0; i < iCapacity; ++i) |
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{ |
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const TContactItemId cid = iEntries[i].iEntry.ContactId(); |
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if (cid != KNullContactId) |
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{ |
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for (TInt j=i+1; j < iCapacity; ++j) |
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{ |
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__ASSERT_ALWAYS(iEntries[j].iEntry.ContactId() != cid, |
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Panic(EPanicInvariant4)); |
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} |
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} |
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} |
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} |
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#endif // _DEBUG |
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|
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// End of File |