--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/phonebookui/Phonebook/inc/CPbkEntryCache.h	Tue Feb 02 10:12:17 2010 +0200
@@ -0,0 +1,144 @@
+/*
+* Copyright (c) 2002 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description: 
+*     Fixed-size cache of TPbkContactEntry instances
+*
+*/
+
+
+#ifndef __CPbkEntryCache_H__
+#define __CPbkEntryCache_H__
+
+//  INCLUDES
+#include    <TPbkContactEntry.h>
+#include    <MPbkContactEntryLoader.h>
+
+// CLASS DECLARATION
+
+/**
+ * @internal Only Phonebook internal use supported!
+ *
+ * Fixed-size cache of TPbkContactEntry instances.
+ */
+class CPbkEntryCache : 
+        public CBase, public MPbkContactEntryLoader
+    {
+    public:
+        /**
+         * Creates a new instance of this class.
+		 * @param aEngine reference to phonebook engine
+         * @param aCapacity cache capacity
+         */
+        IMPORT_C static CPbkEntryCache* NewL(CPbkContactEngine& aEngine,
+			TInt aCapacity);
+
+        /**
+         * Destructor.
+         */
+        ~CPbkEntryCache();
+
+        /**
+         * Returns this cache's capacity.
+         */
+        IMPORT_C TInt Capacity() const;
+
+        /**
+         * Retrieves an entry aId from this cache or loads the 
+         * entry from the DB if not currently present in the cache.
+         *
+         * @exception KErrNotFound  if contact aId is not found in this cache
+         *                          or in contact DB.
+         */
+        IMPORT_C const TPbkContactEntry& GetEntryL(TContactItemId aId);
+
+        /**
+         * Preloads entry aId into this cache if not already present.
+         */
+        IMPORT_C void PreloadL(TContactItemId aId);
+
+        /**
+         * Unloads an entry aId from this cache.
+         */
+        IMPORT_C void Unload(TContactItemId aId);
+
+        /**
+         * Flushes the cache completely.
+         */
+        IMPORT_C void Flush();
+
+        /**
+         * Sets the entry loader from aContactEntryLoader.
+         */
+        inline void SetEntryLoader(MPbkContactEntryLoader&
+			aContactEntryLoader);
+
+    public:  // Debug-only
+        #ifdef _DEBUG
+        /// Debug-only performance statistics for CPbkEntryCache
+        struct TPerfStats
+            {
+            /// Own: hit count (debug only)
+            TInt iHitCount;
+            /// Own: miss count (debug only)
+            TInt iMissCount;
+            } iPerfStats;
+        #endif
+
+    private:  // from MPbkContactEntryLoader
+        void LoadEntryL
+            (TPbkContactEntry& aEntry, 
+            CPbkContactEngine& aEngine, 
+            TContactItemId aContactId);
+
+    private:  // Implementation
+        struct TEntry
+            {
+            TDblQueLink iLink;
+            TPbkContactEntry iEntry;
+            };
+        CPbkEntryCache(CPbkContactEngine& aEngine);
+        void ConstructL(TInt aCapacity);
+        TPbkContactEntry* Find(TContactItemId aId);
+        void Touch(TEntry& aEntry);
+        TEntry* FindEntry(TContactItemId aId) const;
+        const TPbkContactEntry* DebugFind(TContactItemId aId) const;
+        void __DbgTestInvariant() const;
+
+    private:  // Data
+        /// Own: double queue of entries
+        mutable TDblQue<TEntry> iEntryQueue;
+        /// Own: memory block for all the cache entries.
+        TEntry* iEntries;
+        /// Own: Capacity.
+        TInt iCapacity;
+        /// Ref: Phonebook engine.
+        CPbkContactEngine& iEngine;
+        /// Ref: Contact entry loader
+        MPbkContactEntryLoader* iEntryLoader;
+
+    private:  // friend declarations
+        /// For testing only
+        friend class CPbkEntryCache_TestAccess;
+    };
+
+
+inline void CPbkEntryCache::SetEntryLoader
+        (MPbkContactEntryLoader& aContactEntryLoader)
+    {
+    iEntryLoader = &aContactEntryLoader;
+    }
+
+#endif // __CPbkEntryCache_H__
+            
+// End of File