--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/emailservices/emailstore/base_plugin/src/nestedao.cpp	Mon May 03 12:23:15 2010 +0300
@@ -0,0 +1,123 @@
+/*
+* Copyright (c) 2010 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:  Implementation of a nested active object used to handle deletion
+*                of large number of messages by breaking them into smaller chunks
+*
+*/
+
+//  Include Files
+//
+
+
+#include "NestedAO.h"
+#include "baseplugindelayedops.h"
+#include "baseplugindelayedopsprivate.h"
+
+//Class CNestedAO
+
+// --------------------------------------------------------------------------
+//  CNestedAO::NewL
+// ------------ 
+CNestedAO* CNestedAO::NewL( MDeletionHandler& aDeletionHandler )
+    {
+    CNestedAO* self = new(ELeave) CNestedAO( aDeletionHandler );
+    CleanupStack::PushL( self );
+    self->ConstructL();
+    CleanupStack::Pop( self );
+    return self;
+    }
+// --------------------------------------------------------------------------
+//  CNestedAO::CNestedAO
+// ------------ 
+CNestedAO::CNestedAO( MDeletionHandler& aDeletionHandler ) 
+ : CTimer( EPriorityIdle ), iDeletionHandler( aDeletionHandler ), iRc( KErrNone )
+    {
+    }
+// --------------------------------------------------------------------------
+//  CNestedAO::ConstructL()
+// ------------ 
+void CNestedAO::ConstructL()
+    {
+    CTimer::ConstructL();
+    iNestedWait = new( ELeave ) CActiveSchedulerWait();
+    CActiveScheduler::Add( this );
+    }
+// --------------------------------------------------------------------------
+//  CNestedAO::~CNestedAO
+// ------------ 
+CNestedAO::~CNestedAO()
+    {
+    Cancel();
+    delete iNestedWait;
+    }
+// --------------------------------------------------------------------------
+// CNestedAO::DeleteMessagesAsync
+// Used to delete messages asynchronously 
+// Deleting a small number of messages at a time
+// ------------
+void CNestedAO::DeleteMessagesAsync()
+    {
+    iDeletionIndex = 0;
+    After( KWaitIntervalInMicroSecs );  //to invoke RunL after 100 microseconds
+    iNestedWait->Start(); 
+    }
+// --------------------------------------------------------------------------
+//  CNestedAO::DoCancel
+// ------------ 
+void CNestedAO::DoCancel()
+    {
+    iRc = KErrCancel;
+    Stop();
+    }
+// --------------------------------------------------------------------------
+//  CNestedAO::RunL
+// ------------    
+void CNestedAO::RunL()
+    {
+    iRc = iStatus.Int();
+    if ( iStatus.Int() == KErrNone )
+        {
+        TBool done = iDeletionHandler.DeleteMessagesInChunksL( iDeletionIndex );
+        if( !done )
+        	{
+        	//Increment deletionidex
+        	iDeletionIndex+=KSizeOfChunk;
+        	After( KWaitIntervalInMicroSecs ); 
+        	}
+        else
+        	{
+        	Stop();
+        	}
+		}
+    else
+        {
+        Stop();
+        }
+    }
+
+// --------------------------------------------------------------------------
+// CNestedAO::Stop
+// Stops the scheduler from running
+// Called after all messages are processed
+// or in error condition
+// ------------    
+void CNestedAO::Stop()
+    {
+    if( iNestedWait->IsStarted() )
+        {
+        // Stop the nested active scheduler (flow-of-control will pick up immediately following the
+        // call to iWait.Start().
+        iNestedWait->AsyncStop();
+        } // end if
+    }