--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/imservices/instantmessagingcache/imcacheclient/inc/cimcacheaccesseventhandler.h	Wed Nov 03 09:32:20 2010 +0530
@@ -0,0 +1,138 @@
+/*
+* 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:  cache message change observer
+*
+*/
+
+
+#ifndef __CIMCACHEACCESSEVENTHANDLER_H__
+#define __CIMCACHEACCESSEVENTHANDLER_H__
+
+#include <e32std.h>
+#include <e32base.h>
+#include <s32mem.h>
+
+#include <imcachedefs.h>
+
+class MIMCacheClient;
+class MIMCacheEventHandler;
+
+/**
+ * a class to listen to server cache message change
+ */
+NONSHARABLE_CLASS( CIMCacheAccessEventHandler ): public CActive
+    {
+	public:
+		/**
+		* Two-phased constructor.
+		* @param aRegistrar ,client refence
+		* @param aHandler a handler to send data to ui client
+		*/
+		static CIMCacheAccessEventHandler* NewL( MIMCacheClient& aRegistrar ,
+										   MIMCacheEventHandler& aHandler );
+		/**
+		*  ~CIMCacheAccessEventHandler.
+		*/
+    	virtual ~CIMCacheAccessEventHandler();
+
+    public: // From CActive
+
+		/**
+		*  RunL
+		*/
+        void RunL();  
+        
+        /**
+		*  DoCancel
+		*/
+		void DoCancel();
+		
+		 /**
+          *  RunError
+          */
+        TInt RunError( TInt /* aError */);
+		        
+		
+		
+		
+			
+	public : // new functions
+			/**
+			*  UnRegisterObserver from server
+			*/
+			void UnRegisterObserver();
+	private:
+	
+		/**
+		* default CIMCacheAccessEventHandler
+		* @param aRegistrar ,client refence
+		* @param aHandler a handler to send data to ui client
+		*/
+		CIMCacheAccessEventHandler( MIMCacheClient& aRegistrar, 
+							  MIMCacheEventHandler& aHandler);
+		/**
+		*  default ConstructL
+		*/
+    	void ConstructL();
+    	
+   		
+        /**
+         * Gets called when data update is available.
+         * Client can then decide wether to use the old one
+         * @param aBuffer structure of SIMCacheMessageData type
+         */
+    	void GetBufferChatDataL();
+    	
+
+        /**
+         * Gets called when data update is available.
+         * extract the chat data and send to client
+         * @param aChatDataBuffer ,buffer containing number of chat data
+         * @param aMore, indicate that there is still pending packets
+         */
+    	void InternalizeChatDataL( TPtr8 aChatDataBuffer , TBool& aMore );
+    	
+
+        /**
+        * Gets called when data update is available.
+        * get data buffer from server
+        * @param aEventType, type of data
+        */  
+        void GetBufferedChatItemL( TIMCacheEventType aEventType );
+        
+        /**
+        * read the stream and write into buffer
+        * @param aEventType, type of data
+        * @param aChatItemBuffer structure of SIMCacheContactData type
+        */
+            
+        void InternalizeChatItemL( TIMCacheEventType aEventType, 
+                                   TPtr8 aChatItemBuffer );
+   
+	private: // data
+	
+		// doesn't own: registrar
+		MIMCacheClient& iRegistrar;
+		// owned , need to observer to server or not
+		TBool iContinueObserving ;
+		// client side observer event 
+		MIMCacheEventHandler& iAccessHandler;
+		
+    };
+
+#endif      //  __CIMCACHEACCESSEVENTHANDLER_H__
+
+
+//  END OF FILE
+