diff -r 000000000000 -r 818e61de6cd1 crashanalysercmd/PerfToolsSharedLibraries/Engine/SymbianStackLib/Algorithms/StackAlgorithm.cs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crashanalysercmd/PerfToolsSharedLibraries/Engine/SymbianStackLib/Algorithms/StackAlgorithm.cs	Thu Feb 11 15:50:58 2010 +0200
@@ -0,0 +1,134 @@
+/*
+* Copyright (c) 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:
+*
+*/
+using System;
+using SymbianDebugLib.Engine;
+using SymbianStackLib.Data.Output;
+using SymbianStackLib.Data.Source;
+using SymbianStackLib.Engine;
+using SymbianStackLib.Interfaces;
+using SymbianUtils;
+
+namespace SymbianStackLib.Algorithms
+{
+    public abstract class StackAlgorithm : AsyncReaderBase
+    {
+        #region Constructors
+        protected StackAlgorithm( IStackAlgorithmManager aManager, IStackAlgorithmObserver aObserver )
+            : base( aManager )
+        {
+            iManager = aManager;
+            iAlgorithmObserver = aObserver;
+        }
+        #endregion
+
+        #region API
+        public abstract string Name { get; }
+        public abstract int Priority { get; }
+        
+        public virtual bool IsAvailable()
+        {
+            // We must have symbols
+            bool ret = DebugEngineView.Symbols.IsReady;
+            //
+            base.Trace( "[StackAlgorithm] IsAvailable() - ret: {0}", ret );
+            return ret;
+        }
+
+        public virtual void BuildStack( TSynchronicity aSynchronicity )
+        {
+            base.StartRead( aSynchronicity );
+        }
+        #endregion
+
+        #region Properties
+        protected IStackAlgorithmManager Manager
+        {
+            get { return iManager; }
+        }
+
+        protected IStackAlgorithmObserver StackObserver
+        {
+            get { return iAlgorithmObserver; }
+        }
+
+        protected StackEngine Engine
+        {
+            get { return Manager.Engine; }
+        }
+
+        protected DbgEngineView DebugEngineView
+        {
+            get { return iManager.DebugEngineView; }
+        }
+
+        protected StackSourceData SourceData
+        {
+            get { return Engine.DataSource; }
+        }
+
+        protected StackOutputData OutputData
+        {
+            get { return Engine.DataOutput; }
+        }
+        #endregion
+
+        #region From AsyncReaderBase
+        protected override void HandleReadException( Exception aException )
+        {
+            iAlgorithmObserver.StackBuildingException( this, aException );
+        }
+
+        protected override void NotifyEvent( AsyncReaderBase.TEvent aEvent )
+        {
+            switch ( aEvent )
+            {
+            case TEvent.EReadingStarted:
+                iAlgorithmObserver.StackBuildingStarted( this );
+                break;
+            case TEvent.EReadingProgress:
+                {
+                    int progress = base.Progress;
+                    if ( progress != iLastProgress )
+                    {
+                        iAlgorithmObserver.StackBuldingProgress( this, base.Progress );
+                        iLastProgress = progress;
+                    }
+                    break;
+                }
+            case TEvent.EReadingComplete:
+                iAlgorithmObserver.StackBuildingComplete( this );
+                break;
+            }
+            //
+            base.NotifyEvent( aEvent );
+        }
+        #endregion
+
+        #region From System.Object
+        public override string ToString()
+        {
+            return Name;
+        }
+        #endregion
+
+        #region Data members
+        private readonly IStackAlgorithmManager iManager;
+        private readonly IStackAlgorithmObserver iAlgorithmObserver;
+        private int iLastProgress = 0;
+        #endregion
+    }
+}