--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browserplugins/browsersysteminfoplugin/inc/SystemInfoObserver.h	Mon Mar 30 12:49:49 2009 +0300
@@ -0,0 +1,133 @@
+/*
+* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of the License "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 SYSTEMOBSERVER_H
+#define SYSTEMOBSERVER_H
+
+// INCLUDES
+#include <e32base.h>
+#include <npscript.h>
+
+// FORWARD DECLARATIONS
+
+// CONSTANTS
+
+// State enum and member variable
+
+// CLASS DECLARATIONS
+
+/**
+ * MSystemInfoObserverClient is an interface to whatever data is being
+ * observed (RProperty, int, string, etc).
+ * @lib npSystemInfoPlugin.lib
+ * @since S60 v3.2
+ */
+class MSystemInfoObserverClient
+    {
+public:
+    virtual void SubscribeL( TInt aId, TRequestStatus& aStatus ) = 0;
+    virtual void UpdateL( TInt aId ) = 0;
+    virtual void Cancel( TInt aId ) = 0;
+    virtual void Close( TInt aId ) = 0;
+/*
+ * Outline of use for a publish and subscribe variable
+ * #include <e32property.h>
+ * #include <hwrmpowerstatesdkpskeys.h>
+ * RProperty iProperty;
+ * iProperty.Attach( KPSUidHWRMPowerState, KHWRMBatteryLevel );
+ * SubscribeL => iProperty.Subscribe( status );
+ * UpdateL => iProperty.Get( value );
+ * Cancel => iProperty.Cancel();
+ * Close => iProperty.Close();
+ * The ID parameter is there so that a class can contain
+ * multiple observers and differentiate them in these methods by ID.
+ * You can also use it for state in a state machine.
+ */
+    };
+
+/**
+*  CSystemInfoObserver.
+*  Active class for monitoring variables.
+*  @lib npSystemInfoPlugin.lib
+*  @since S60 v3.2
+*/
+NONSHARABLE_CLASS(CSystemInfoObserver) : public CActive
+    {
+public:
+    /**
+     * Two-phased constructor.
+     */
+    static CSystemInfoObserver* NewL( MSystemInfoObserverClient* aClient, TInt aId );
+
+    /**
+     * Destructor.
+     */
+    virtual ~CSystemInfoObserver();
+
+private:
+    /**
+     * C++ default constructor.
+     */
+    CSystemInfoObserver( MSystemInfoObserverClient* aClient, TInt aId );
+
+    /**
+     * By default Symbian 2nd phase constructor is private.
+     * @param none
+     * @return void
+     */
+    void ConstructL();
+
+public:
+    /**
+     * Request observed status change notification
+     * @since 3.2
+     * @param none
+     * @return void
+     */
+    void RequestNotificationL();
+
+protected:    // CActive
+    /**
+     * Implements cancellation of an outstanding request.
+     * @param none
+     * @return void
+     */
+    void DoCancel();
+
+    /**
+     * Handles an active object’s request completion event.
+     * @param none
+     * @return void
+     */
+    void RunL();
+
+    /**
+     * Handles an active object’s error
+     * @param error
+     * @return void
+     */
+    TInt RunError(TInt aError);
+
+private:
+    MSystemInfoObserverClient* iClient;
+    TInt iId;
+    };
+
+#endif      // SYSTEMOBSERVER_H
+
+// End of File