diff -r a151135b0cf9 -r aa2539c91954 tracesrv/tracecore/btrace_handler/inc/TraceCoreActivationBase.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tracesrv/tracecore/btrace_handler/inc/TraceCoreActivationBase.h	Fri Oct 08 14:56:39 2010 +0300
@@ -0,0 +1,121 @@
+// Copyright (c) 2007-2010 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:
+// Base class for activation classes
+//
+
+#ifndef __TRACECOREACTIVATIONBASE_H__
+#define __TRACECOREACTIVATIONBASE_H__
+
+
+// Include files
+#include "TraceCoreSubscriber.h"
+#include "TraceCoreActivation.h"
+
+//forward declarations
+class DMutex;
+
+/**
+ * Base class for activation objects. This extends the subscriber base class to receive activation updates
+ */
+NONSHARABLE_CLASS( DTraceCoreActivationBase ) : public DTraceCoreSubscriber, public MTraceCoreActivation
+    {
+public:
+
+    /**
+     * Constructor
+     */
+    DTraceCoreActivationBase();
+    
+    /**
+     * Destructor
+     */
+    virtual ~DTraceCoreActivationBase();
+    
+    /**
+     * Registers an activation notification interface
+     * 
+     * @param aNotification the notification interface
+     */
+    TInt RegisterActivationNotification( MTraceCoreActivationNotification& aNotification );
+    
+protected:
+
+    /**
+     * Subscribes to message ID and registers to activation interface list
+     * 
+     * @param aMessageID the message id to be subscribed
+     */         
+    TInt Init( TUint32 aMessageId );
+
+    /**
+     * Subscribes to message ID and registers to activation interface list
+     * 
+     * @param aMessageID the message id to be subscribed
+     */
+    TInt SubscribeMessage( TUint32 aMessageId, TMessageHeaderFormat aMsgFormat );
+
+    /**
+     * Sends notification to TraceCore internal activation notification interfaces
+     * 
+     * @param aFromSettings ETrue if activation was due to settings read, EFalse if from some other source
+     * @param aComponentId Component ID of the activation
+     */
+    void NotifyInternalActivation( TBool aFromSettings, TUint32 aComponentId );
+    
+    /**
+     * Send response
+     * 
+     * @param aMessage Response message
+     */
+    void SendResponse( TTraceMessage &aMessage );
+    
+    /**
+     * Prevent read-check to internal structures (fast lock).
+     */
+    inline TInt ReadLock();
+    
+    /**
+     * Restore read-access to internal structures.
+     */
+    inline void ReadUnlock(TInt aIrqLevel);
+    
+    
+protected: //data
+    
+    /**
+     * Lock used in 'critical path' where performance is very important.
+     * It is used in those routines where structures are checked and not modified.
+     */
+#if defined(__SMP__)
+    TSpinLock   iActivationReadLock;
+#endif
+    
+    /**
+     * Used to store Irq level between spin lock/unlock operation.
+     */
+    TInt iIrqLevel;
+    
+private:
+
+    /**
+     * Array of activation notification interfaces
+     */
+    RPointerArray< MTraceCoreActivationNotification > iActivationNotification;
+    };
+
+
+#include "TraceCoreActivationBase.inl"
+
+
+#endif /* __TRACECOREACTIVATIONBASE_H__ */