--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/emailservices/emailstore/base_plugin/src/NestedAO.cpp	Tue Apr 27 16:20:14 2010 +0300
@@ -0,0 +1,124 @@
+/*
+* ==============================================================================
+*  Name        : NestedAO.cpp
+*  Part of     : Base Plugin
+*  Description : Implementation of a nested active object used to handle deletion
+*                of large number of messages by breaking them into smaller chunks
+*  Version     : 
+*
+*  Copyright (c) 2005 - 2010 Nokia Corporation.
+*  This material, including documentation and any related
+*  computer programs, is protected by copyright controlled by
+*  Nokia Corporation. All rights are reserved. Copying,
+*  including reproducing, storing, adapting or translating, any
+*  or all of this material requires the prior written consent of
+*  Nokia Corporation. This material also contains confidential
+*  information which may not be disclosed to others without the
+*  prior written consent of Nokia Corporation.
+* ==============================================================================
+*/
+//  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
+    }