diff -r 000000000000 -r ba25891c3a9e appinstaller/AppMngr2/inc/appmngr2infoarray.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/appinstaller/AppMngr2/inc/appmngr2infoarray.h	Thu Dec 17 08:51:10 2009 +0200
@@ -0,0 +1,94 @@
+/*
+* Copyright (c) 2008 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:   Base class for AppInfo and PackageInfo arrays
+*
+*/
+
+
+#ifndef C_APPMNGR2INFOARRAY_H
+#define C_APPMNGR2INFOARRAY_H
+
+#include <e32base.h>                    // CBase
+#include <appmngr2infobase.h>           // CAppMngr2InfoBase
+#include "appmngr2infoarrayobserver.h"  // MAppMngr2InfoArrayObserver
+
+
+/**
+ * CAppMngr2InfoArray contains list of installation files or installed apps.
+ * CAppMngr2Model uses these arrays to hold data received from scanning
+ * installation directories or application registeries. Application UI uses
+ * these arrays (via CAppMngr2Model) to get info about displayed items.
+ * Functions At() and Count() are used for this purpose. Changes in array
+ * content are notified using interface MAppMngr2InfoArrayObserver, and
+ * makes the Application UI to refresh displayed lists.
+ *
+ * A "cache" buffer is used to maintain old data while new data is collected. 
+ * For example, new installation files found in scanning are stored in iArray,
+ * and old content is used from iCache while the scanning is on-going and more
+ * items are added to iArray. When the scanning completes, new content in
+ * iArray is taken in use (old content in iCache is discarded) and UI is
+ * notified about the change.
+ * 
+ * Notifications can be disabled temporarily, which means that cache is
+ * locked in use temporarily. When notifications are disabled, new content
+ * may be received to iArray as usual, but no notifications are sent to
+ * observer until notifications are enabled again. CAppMngr2Model disables
+ * the notifications while a plugin specific command is running, as it needs
+ * to call CommandComplete() when the running command completes. Plugin
+ * specific commands (like delete or uninstall) may launch new scanning that
+ * change the array content. CAppMngr2Model maintains pointer iActiveItem
+ * to the item that is running the plugin specific command, and this item
+ * is actually stored in iArray or iCache. If array content could change
+ * while the command is run, iActiveItem might not be valid any more after
+ * the command is complete and calling iActiveItem->CommandComplete()
+ * might raise a KERN-EXEC panic. 
+ */
+
+class CAppMngr2InfoArray : public CBase
+    {
+public:     // constructor and destructor
+    CAppMngr2InfoArray( MAppMngr2InfoArrayObserver& aObserver );
+    ~CAppMngr2InfoArray();
+
+public:     // new functions
+    CAppMngr2InfoBase* At( TInt aIndex ) const;
+    TInt Count() const;
+    void IncrementCacheUseL();
+    void IncrementCacheUseStartingNewRoundL();
+    void DecrementCacheUse();
+    void DisableRefreshNotificationsL();
+    void EnableRefreshNotificationsL();
+    void AddItemInOrderL( CAppMngr2InfoBase* aInfo );
+    void ImmediateDelete( CAppMngr2InfoBase* aInfo );
+
+private:    // new functions
+    void MoveItemsToCacheMaintainingOrderL();
+    void MoveCachedItemsToArrayInOrderL();
+    void NotifyObserver();
+    TBool IsCacheUsed() const;
+
+protected:  // data
+    MAppMngr2InfoArrayObserver& iObserver;
+    RPointerArray<CAppMngr2InfoBase> iArray;
+    RPointerArray<CAppMngr2InfoBase> iCache;
+    TLinearOrder<CAppMngr2InfoBase> iAlphabeticalOrder;
+    TBool iForceCacheUse;
+    TBool iForceCacheUseWhenAddingComplete;
+    TBool iQuickRefreshes;
+    TBool iArrayChangedObserverNeedsNotification;
+    TInt iUseCache;
+    };
+
+#endif  // C_APPMNGR2INFOARRAY_H
+