--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/phonebookengines/contactsmodel/cntsrv/inc/CActiveLoop.h	Tue Feb 02 10:12:17 2010 +0200
@@ -0,0 +1,63 @@
+/**
+* Copyright (c) 2005-2009 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:
+*
+*/
+
+
+
+#ifndef CACTIVELOOP_H
+#define CACTIVELOOP_H
+
+#include <e32base.h>
+
+class MActiveLoopCallBack 
+	{
+public:
+	virtual TBool DoStepL() = 0;
+	virtual void  DoError(TInt aError) = 0;
+	};
+
+
+/**
+CActiveLoop class should be used in the server for all long-running operations.
+Since the server is single threaded any long running operation will effectively
+block the server for all other clients. In order to avoid it, the long running
+operations should be done with incremental steps. Each step should be called
+from the active object and controll should be passed to the active scheduler
+afterwards. 
+CActiveLoop is based on CTimer in order to give the Server active object
+priority on the loop operations. It is particularly necessary for Cancel of
+asynchronous operation use case, where ServiceL must be called between the
+steps of an incremental operation.
+*/
+class CActiveLoop : public CTimer
+	{
+public:
+	void 	Register(MActiveLoopCallBack & aCallBack, TBool aUseTimer = EFalse);
+	void 	RunL();
+	static 	CActiveLoop* NewL();
+	void 	DoCancel();
+		   ~CActiveLoop();
+	TInt 	RunError(TInt aError);	  
+	
+private:
+	CActiveLoop();
+	
+private:	
+	MActiveLoopCallBack* iCallBack;
+	}; 
+
+
+#endif