diff -r 6dfc5f825351 -r 50bf9db68373 harvester/server/inc/harvesterdiskspaceobserver.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/harvester/server/inc/harvesterdiskspaceobserver.h	Fri Apr 16 15:23:55 2010 +0300
@@ -0,0 +1,152 @@
+/*
+* Copyright (c) 2009 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:  Low disk space observer for harvester server
+*
+*/
+
+
+#ifndef MDSHARVESTERDISKSPACEOBSERVERAO_H
+#define MDSHARVESTERDISKSPACEOBSERVERAO_H
+
+// INCLUDE FILES
+#include <e32base.h>
+#include <f32file.h>
+
+/**
+* MMdSHarvesterDiskSpaceObserver
+* Observer interface for a disk space notifier.
+*/
+class MMdSHarvesterDiskSpaceObserver
+    {
+    public :
+        enum TDiskSpaceDirection
+            {
+            /** Disk space is larger than threshold level */
+            EMore,
+
+            /** Disk space is smaller than threshold level */
+            ELess
+            };
+
+        /**
+         * Called to notify the observer that disk space has crossed the specified threshold value.
+         *
+         * @param aCrossDirection threshold cross direction
+         */
+        virtual void HandleDiskSpaceNotificationL(TDiskSpaceDirection aDiskSpaceDirection) = 0;
+    };
+
+/**
+* CMSDiskSpaceNotifierAO.
+* A disk space notifier class
+*/
+class CMdSHarvesterDiskspaceObserverAO : public CActive
+    {
+    public:
+        enum TDiskSpaceNotifierState
+            {
+            ENormal,
+            EIterate
+            };
+
+    public : // Constructors and destructors
+        /**
+         * Constructs a disk space notifier implementation.
+         *
+         * @param aThreshold minimum free disk space threshold level in bytes
+         * @param aFilename filename which defines monitored drive's number
+         * @return  metadata server implementation
+         */
+        static CMdSHarvesterDiskspaceObserverAO* NewL(
+            MMdSHarvesterDiskSpaceObserver& aObserver, 
+            TInt64 aThreshold, const TDesC& aFilename);
+
+        /**
+         * Constructs a disk space notifier implementation and leaves it
+         * in the cleanup stack.
+         *
+         * @param aThreshold minimum free disk space threshold level in bytes
+         * @param aFilename filename which defines monitored drive's number
+         * @return  metadata server implementation
+         */
+        static CMdSHarvesterDiskspaceObserverAO* NewLC(        
+            MMdSHarvesterDiskSpaceObserver& aObserver, 
+            TInt64 aThreshold, const TDesC& aFilename);
+
+        /**
+        * Destructor.
+        */
+        virtual ~CMdSHarvesterDiskspaceObserverAO();
+
+    protected: // Functions from base classes
+        /**
+         * From CActive
+         * Callback function.
+         * Invoked to handle responses from the server.
+         */
+        void RunL();
+
+        /**
+         * From CActive
+         * Handles errors that occur during notifying the observer.
+         */
+        TInt RunError(TInt aError);
+
+        /**
+         * From CActive
+         * Cancels any outstanding operation.
+         */
+        void DoCancel();
+
+    private: // Constructors and destructors
+
+        /**
+         * constructor
+         */
+        CMdSHarvesterDiskspaceObserverAO(
+            MMdSHarvesterDiskSpaceObserver& aObserver,
+            TInt64 aThreshold, TDriveNumber aDrive);
+
+        /**
+         * 2nd phase constructor
+         * @param aThreshold minimum free disk space threshold level in bytes
+         * @param aDrive monitored drive's number
+         */
+        void ConstructL();
+
+    private: // New methods
+
+        void StartNotifier();
+
+        static TDriveNumber GetDriveNumberL( const TDesC& aFilename );
+
+    private: // Data
+
+        MMdSHarvesterDiskSpaceObserver& iObserver;
+        
+        RFs iFileServerSession;
+        
+        const TInt64 iThreshold;
+        
+        const TDriveNumber iDrive;
+        
+        TDiskSpaceNotifierState iState;
+        
+        TInt iIterationCount;
+    };
+
+#endif // MDSHARVESTERDISKSPACEOBSERVERAO_H
+
+// End of File
+