diff -r 000000000000 -r bde4ae8d615e os/persistentdata/traceservices/tracefw/ulogger/inc/uloggerplugin.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/os/persistentdata/traceservices/tracefw/ulogger/inc/uloggerplugin.h	Fri Jun 15 03:10:57 2012 +0200
@@ -0,0 +1,96 @@
+// Copyright (c) 2007-2009 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:
+// ULogger plug-in base class
+// 
+//
+
+/**
+ @file
+ @publishedPartner
+ @prototype
+*/
+
+#ifndef ULOGGERPLUGIN_H
+#define ULOGGERPLUGIN_H
+
+#include <e32base.h>
+#include <ecom/implementationinformation.h>
+#include <ecom/ecomresolverparams.h>
+#include <ecom/ecom.h>
+
+namespace Ulogger
+{
+//! Base class for all ULogger plug-ins.
+/*!
+ULogger is extensible through a plug-in framework that uses ECom for plug-in
+discovery. Deriving from this class means that all the ECom-specific logic is
+already provided for the plug-in implementer, out-of-the-box, leaving the
+plug-in code to deal with the domain-specific logic that the plug-in is supposed
+to implement only.
+
+Among the plug-in types that are currently supported are output plug-ins (see
+class ULogger::MOutputPlugin in uloggeroutputplugin.h) and input plug-ins (see
+class ULogger::MInputPlugin in uloggerinputplugin.h).
+
+Plug-ins must derive from this class in order to be compatible with ULogger.
+*/
+class CPlugin : public CBase
+	{
+public:
+	/**
+	Enum to signify plug-in interface types. Used by each specific plug-in
+	interface (M-class) to identify itself as being of a particular type.
+	*/
+	enum TPluginInterface
+	{
+	EOutput,//!< output plug-in interface type
+	EInput  //!< input plug-in interface type
+	};
+
+public:
+	/**
+	Creates a CPlugin instance of the specified type and returns a pointer to
+	it. The type is specified as the name of the ECom plug-in DLL (without the
+	dll	extension).
+
+	@param aCue a descriptor containing the name of the plug-in to be created
+	@return A pointer to the newly created CPlugin object.
+	*/
+	static CPlugin* NewL(const TDesC8& aCue);
+
+	/**
+	Virtual destructor.
+	*/
+	virtual ~CPlugin();
+
+	/**
+	Return pointer to requested interface. 
+	If plug-in implements multiple interfaces, it should return pointer to
+	proper interface trough this method.
+
+	@param aInterfaceId Number of requested interface.
+	@return Pointer to requested interface or NULL if requested interface is not
+	        supported.
+	*/
+	virtual TAny* GetInterfaceL(TPluginInterface aInterfaceId) = 0;
+
+private:
+	TUid iDtor_ID_Key;		 
+	};
+
+} //end of namespace
+
+#include "uloggerplugin.inl" // Our own base implementations for ECOM
+
+#endif /* ULOGGERPLUGIN_H */