--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/internetradio2.0/songhistoryinc/irsonghistoryengpubsub.h	Mon Apr 19 14:01:53 2010 +0300
@@ -0,0 +1,112 @@
+/*
+* Copyright (c) 2006-2007 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:  Active class notifying metada and channel name changes to SongHistoryDb engine
+*
+*/
+
+#ifndef CIRSONGHISTORYENGPUBSUB_H
+#define CIRSONGHISTORYENGPUBSUB_H
+
+#define KMAXLENGTH 250
+#include <e32base.h>
+#include <e32property.h>
+
+class MIRSongHistoryEngPubSubNotifyHandler;
+
+
+
+/**
+* Listens to one specified Publish & Subscribe key, notifying the observer whenever that key is changed.
+*/
+NONSHARABLE_CLASS(CIRSongHistoryEngPubSub) : public CActive
+    {
+    public:
+
+        /**
+        * Static constructor.
+        * @param    aObserver   The observer to be notified of the changes in the listened key.
+        * @param    aCategory   The category of the key.
+        * @param    aKey        The key to listen to.
+        */
+    static CIRSongHistoryEngPubSub* NewL( MIRSongHistoryEngPubSubNotifyHandler&
+    		aPubSubObserver, const TUid& aCategory, TUint aKey ,
+    		const RProperty::TType aPropertyType  );
+        /**
+        * Static constructor.
+        * @param    aObserver   The observer to be notified of the changes in the listened key.
+        * @param    aCategory   The category of the key.
+        * @param    aKey        The key to listen to.
+        */
+    static CIRSongHistoryEngPubSub* NewLC( MIRSongHistoryEngPubSubNotifyHandler&
+    		aPubSubObserver, const TUid& aCategory, TUint aKey ,
+    		const RProperty::TType aPropertyType  );
+        /**
+        * Destructor.
+        */
+        ~CIRSongHistoryEngPubSub();
+
+
+    protected: // From CActive
+
+        /**
+    *void RunL()
+    *The function is called by the active scheduler
+    *when a request completion event occurs,
+        */
+        void RunL();
+
+        /**
+    *void DoCancel()
+    *Invoked when the active object is cancelled.
+        */
+        void DoCancel();
+
+    private:
+
+        /**
+        * Constructor.
+        * @param    aObserver   The observer to be notified of the changes in the listened key.
+        * @param    aCategory   The category of the key.
+        * @param    aKey        The key to listen to.
+        */
+    CIRSongHistoryEngPubSub( MIRSongHistoryEngPubSubNotifyHandler& aPubSubObserver,
+    	const TUid& aCategory, TUint aKey, const RProperty::TType aPropertyType );
+
+        /**
+        * Second-phase constructor.
+        */
+        void ConstructL();
+
+    protected:
+
+        /** Handle to the property. */
+        RProperty iProperty;
+        RProperty::TType iPropertyType;
+
+        /** The observer to be notified of the changes in the listened key. */
+        MIRSongHistoryEngPubSubNotifyHandler& iPubSubObserver;
+
+        /** The category of the key to listen to. */
+        TUid iCategory;
+
+        /** The key to listen to. */
+        TUint iKey;
+
+        /** The cached value of the key. */
+        mutable TBuf8<KMAXLENGTH> iText;
+
+
+    };
+
+#endif//IR_SONGHISTORYENGPUBSUB