Obtics

Closed Issue: ConcurrentHashtable : Custom Comparer Madness! [5603]

rdhatch — Thu, 16 May 2013 04:55:52 GMT

Hi Thomas -

I would really appreciate a fix for this. We've put several days into this issue.

Background:
--------------------------
We are using Obtics with LLBLGen Pro, one of the strongest ORMs for .NET (also from the Netherlands). All our Calculations are performed server-side in real-time (not on the client as with Silverlight). Thus - ConcurrentHashtable is EXTREMELY important so users are isolated from eachother's Calculations on the server.

Problem:
--------------------------
Obtics is not always using the ObticsEqualityComparerAttribute to do comparisons. Our breakpoints in our custom Comparer are firing, so we know we are hooked in correctly. However, Obtics is still calling .Equals or .GetHashCode on the objects themselves - instead of our Comparer. This is causing major problems.

Unwanted Side Effects, either:
1.) With Custom Comparer: Only calculations in the first screen work, no calculations in any successive screens or dialogs will function.
2.) Without Custom Comparer: All Calculations for an Entity are shared across all user sessions!! If User #1 views Entity A1, and another User #2 views Entity A2... User #1's calculations are displayed on User #2's screen.

LLBLGen Pro
--------------------------
.Equals() method is based solely on PrimaryKeys.
.GetHashCode() method is based solely on all matching field values.

Using the methods above, cloning an Entity will result in the clone & original being "equal". Also, fetching the same entity twice from the DB... both instances are considered "equal" in the LLBLGen world. Thus, Obtics will not listen to a cloned entity or a re-fetched entity - because Obtics thinks it is already listening to it, when really it's only listening to the first entity.

This is severely limiting & does not allow for multiple instances of an Entity to be calculated independently on separate screens.

We are using deep cloning extensively for child screens / dialog windows where Calculations must be made. Thus - the main screen's Calculations must be kept /completely/ separate from the child screen's Calculations. For our cloned entities to Calculate independently of the original entities, we need to enforce ReferenceEquals() comparison in Obtics. Anything less will result in disastrous cross-screen & cross-session calculations. As you can imagine - horror stories for both our users and the development team.

After days of work, we have narrowed it down to a simple unit test, which I am more than happy to provide you with.

Also, We do not create any anonymous types in our Expressions, as you have mentioned in other posts. We have read up on:
* http://obtics.codeplex.com/wikipage?title=Well-behaved&ProjectName=obtics
* http://obtics.codeplex.com/WorkItem/View.aspx?WorkItemId=5208

In Summary, We simply need Obtics to */always/* use the custom IEqualityComparer.

Please help, Thomas! You are greatly appreciated here - we hold Obtics in high regard. Look forward to hearing from you.

Thank you very much. Sincerely,

Ryan D. Hatch

Custom Comparer - Used to keep each object instance separate, so calculations are able to fire separately on two cloned entities:
---
public class RyansObticsEntityComparer : IEqualityComparer<CommonEntityBase>
{
public bool Equals(CommonEntityBase x, CommonEntityBase y)
{
// Require Same Instance
return ReferenceEquals(x, y);
}

public int GetHashCode(CommonEntityBase obj)
{
// Return Unique Instance Guid
byte[] guidBytes = obj.UniqueInstanceID.ToByteArray();
return BitConverter.ToInt32(guidBytes, 0);
}
}

[Obtics.ObticsEqualityComparer(typeof(RyansObticsEntityComparer))]
public class CommonEntityBase
{ ...

New Post: Alternative

happynomad — Fri, 01 Feb 2013 00:29:36 GMT

This project looks great -- I wish I found it sooner. In fact, I already implemented an alternative which I blogged about today: http://happynomad121.blogspot.com/2013/01/data-binding-among-complex-expressions.html . I hope to get some feedback on my approach.

Source code checked in, #69631

Project Collection Service Accounts — Mon, 01 Oct 2012 21:13:48 GMT

Upgrade: New Version of LabDefaultTemplate.xaml. To upgrade your build definitions, please visit the following link: http://go.microsoft.com/fwlink/?LinkId=254563

Source code checked in, #69630

Project Collection Service Accounts — Mon, 01 Oct 2012 21:07:03 GMT

Checked in by server upgrade

New Post: Why is this collection keeps getting recreated everytime?

stylusdotnet — Tue, 10 Jul 2012 14:32:30 GMT

For other programmers who are having problems with this kind of exception, I ended up having this code.

        private void CreateQueries()
        {
            var query = ExpressionObserver.Execute(() => (from o in _orders
                                                          where o.State != OrderStateEnum.Canceled
                                                          group o by o.Isin
                                                              into g
                                                              let name = _referenceData.GetInstrumentName(g.Key)
                                                              orderby name ascending
                                                              select GetComplexRowViewModel(
                                                                                            g.First()
                                                                                            ,
                                                                                            (from p in _quotes
                                                                                             where
                                                                                                 p.Isin == g.Key &&
                                                                                                 p.Exchange == _referenceData.GetPrimaryExchangeId(g.Key) &&
                                                                                                 p.Provider == ProviderEnum.Bloomberg
                                                                                             select GetSimpleRowViewModel(p))
                                                                                             ,
                                                                                             (from q in _quotes
                                                                                              where
                                                                                                  q.Isin == g.Key &&
                                                                                                  q.Provider == ProviderEnum.Tradebase &&
                                                                                                  g.Select(s => s.Exchange).Contains(q.Exchange)
                                                                                              select GetSimpleRowViewModel(q))
                                                                                              ,
                                                                                              (from o in _orders
                                                                                               where o.Isin == g.Key
                                                                                               && o.State != OrderStateEnum.Canceled
                                                                                               group o by new { o.LimitPrice, o.OrderSide } into x
                                                                                               select GetCompressedRowViewModel
                                                                                               (
                                                                                                   x.Key.OrderSide == OrderSideEnum.Sell ? (decimal?)x.Key.LimitPrice : (decimal?)null,
                                                                                                   x.Key.OrderSide == OrderSideEnum.Sell ? x.Select(s => s.Quantity).Aggregate((c, n) => c + n) : 0,
                                                                                                   x.Key.OrderSide == OrderSideEnum.Buy ? (decimal?)x.Key.LimitPrice : (decimal?)null,
                                                                                                   x.Key.OrderSide == OrderSideEnum.Buy ? x.Select(s => s.Quantity).Aggregate((c, n) => c + n) : 0,
                                                                                                   string.Join(", ", x.Select(s => s.Exchange)),
                                                                                                   x.First().Isin.ToString(),
                                                                                                   x.Key.OrderSide == OrderSideEnum.Buy ? x.Count() : 0,
                                                                                                   x.Key.OrderSide == OrderSideEnum.Sell ? x.Count() : 0,
                                                                                                   x.Key.OrderSide == OrderSideEnum.Sell ? RowSide.Sell : RowSide.Buy
                                                                                               ))
                                                                   ,
                                                                   (from o in _orders
                                                                    where o.Isin == g.Key
                                                                    && o.State != OrderStateEnum.Canceled
                                                                    select GetUncompressedRowViewModel(o))
                                                                  
                                                                                             ))).Cascade();
            GridData = query;
        }


        // Obtics 
        private ConcurrentDictionary<string, ComplexRowViewModel> _complexRowViewModels = new ConcurrentDictionary<string, ComplexRowViewModel>();
        private ComplexRowViewModel GetComplexRowViewModel(OrderStatusViewModel model, IEnumerable<SimpleRowViewModel> primaryExchanges, IEnumerable<SimpleRowViewModel> groupped
            , IEnumerable<CompressedRowViewModel> compressed, IEnumerable<UncompressedRowViewModel> uncompressed)
        {
            if (model == null)
                return _complexRowViewModels.GetOrAdd("", s2 => new ComplexRowViewModel());

            return _complexRowViewModels.GetOrAdd(model.Isin,
                                                  s2 =>
                                                  new ComplexRowViewModel(_referenceData) { UnderlyingOrder = model, PrimaryExchange = primaryExchanges.First(), Groupped = groupped, Compressed = compressed, Uncompressed = uncompressed });
        }

        private ConcurrentDictionary<string, SimpleRowViewModel> _simpleRowViewModels = new ConcurrentDictionary<string, SimpleRowViewModel>();
        private SimpleRowViewModel GetSimpleRowViewModel(QuoteTickViewModel model)
        {
            if (model == null)
                return _simpleRowViewModels.GetOrAdd("", s2 => new SimpleRowViewModel());

            return _simpleRowViewModels.GetOrAdd(model.Isin + model.Exchange,
                                                                s2 =>
                                                                new SimpleRowViewModel() { UnderlyingQuote = model });
        }

        private ConcurrentDictionary<string, UncompressedRowViewModel> _uncompressedRowViewModels = new ConcurrentDictionary<string, UncompressedRowViewModel>();
        private UncompressedRowViewModel GetUncompressedRowViewModel(OrderStatusViewModel model)
        {
            if (model == null)
                return _uncompressedRowViewModels.GetOrAdd("", s2 => new UncompressedRowViewModel());

            return _uncompressedRowViewModels.GetOrAdd(model.InternalId,
                                                                s2 =>
                                                                new UncompressedRowViewModel() { UnderlyingOrder = model });
        }

        private ConcurrentDictionary<string, CompressedRowViewModel> _compressedRowViewModels = new ConcurrentDictionary<string, CompressedRowViewModel>();
        private CompressedRowViewModel GetCompressedRowViewModel(decimal? Ask, int AskSize, decimal? Bid, int BidSize, string Exchange, string Isin, int OrderBuyCount, int OrderSellCount, RowSide RowSide)
        {

            return new CompressedRowViewModel()
                       {
                           Ask = Ask,
                           AskSize = AskSize,
                           Bid = Bid,
                           BidSize = BidSize,
                           Exchange = Exchange,
                           Isin = Isin,
                           OrderBuyCount = OrderBuyCount,
                           OrderSellCount = OrderSellCount,
                           RowSide = RowSide
                       };
        }

So basically we what we can say is, Obtics is not entirely compatible with lambda and linq.

If you want to shape your viewmodels into another format or use surrogate classes or having aggregation with creating new classes on the fly, Obtics is not for you.

Thanks anyway.

New Post: Why is this collection keeps getting recreated everytime?

throb — Tue, 10 Jul 2012 13:43:08 GMT

It is probably the same issue as mentioned in this thread: http://obtics.codeplex.com/discussions/360575

The engine does not maintain a list with conversions. It uses your lambda function to find a conversion it needs for adding AND removing. So your lambda needs to return an equal result (not necessairily referentially equal) when it gets called with equal parameters. So:

X x = value;

Func<X,Y> yourLambda = <stuff>;

Assert.IsTrue(EqualityComparer<Y>.Default.Equals(yourLambda(x),yourLambda(x)));

New Post: Why is this collection keeps getting recreated everytime?

stylusdotnet — Mon, 09 Jul 2012 20:34:02 GMT

As far as I understand, obtics engine is still searching for the order with active state but at that time the object already got the cancelled state. so if not an equal object returns i get an error.

but the solutions is to keep a list with every orderstate which kind of impossible

New Post: Why is this collection keeps getting recreated everytime?

stylusdotnet — Mon, 09 Jul 2012 14:15:02 GMT

I am testing it for 3 days now. I've bumped my head to my desk several times because of this :) please help, I'm uploading my class which creates these queries.

http://www.4shared.com/file/ce_V8PPh/MarketData.html

Everything works fine until an OrderStatus gets a "Cancelled" state. I think it is because I filter the cancelled orders on top of the query. But how is this relevant I don't know. Anyway, the exception is:

InvalidOperationException, Added item does not appear at given index '0'.

But this totally makes no sense since the item is already there.

I'd be really glad if anyone can help me.

New Post: Why is this collection keeps getting recreated everytime?

stylusdotnet — Fri, 06 Jul 2012 13:40:46 GMT

Allright I've somehow fixed that problem but now I got a new one :)

Added item does not appear at given index '1'.

It is a typical threading problem but I really dont know what can I do about it.

'Pulse.UI.vshost.exe' (Managed (v4.0.30319)): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\Accessibility\v4.0_4.0.0.0__b03f5f7f11d50a3a\Accessibility.dll'A first chance exception of type 'System.InvalidOperationException' occurred in PresentationFramework.dllSystem.Transactions Critical: 0 : <TraceRecord xmlns="http://schemas.microsoft.com/2004/10/E2ETraceEvent/TraceRecord" Severity="Critical"><TraceIdentifier>http://msdn.microsoft.com/TraceCodes/System/ActivityTracing/2004/07/Reliability/Exception/Unhandled</TraceIdentifier><Description>Unhandled exception</Description><AppDomain>Pulse.UI.vshost.exe</AppDomain><Exception><ExceptionType>System.InvalidOperationException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</ExceptionType><Message>Added item does not appear at given index '1'.</Message><StackTrace> at MS.Internal.Data.EnumerableCollectionView.ProcessCollectionChanged(NotifyCollectionChangedEventArgs args) at System.Windows.Data.CollectionView.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args) at Obtics.NCToNCC.NotifyChanged(Object sender, INCEventArgs changeArgs) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(Object rawMessage) at Obtics.Collections.Transformations.NotifyVpcTransformation`2.Notifier.NotifyChanged(Object sender, INCEventArgs changeArgs) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObjectToVP`2.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObjectToVP`2.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObjectToVP`2.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.Collections.Transformations.TranslucentTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(Object rawMessage) at Obtics.Collections.Transformations.UnorderedCascadeTransformation`2.BufferNodeCC.NotifyChanged(Object sender, INCEventArgs changeArgs) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.Collections.Transformations.TranslucentTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(Object rawMessage) at Obtics.Collections.Transformations.UnorderedNotifyVpcTransformation`2.Notifier.NotifyChanged(Object sender, INCEventArgs changeArgs) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObjectToVP`2.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObjectToVP`2.Release(INCEventArgs message) at Obtics.Values.Transformations.PropertyTransformation`2.Buffer_PropertyChanged(Object sender, EventArgs args) at Obtics.Values.Transformations.PropertyTransformation`2.npc_PropertyChanged(Object sender, PropertyChangedEventArgs e) at System.ComponentModel.PropertyChangedEventHandler.Invoke(Object sender, PropertyChangedEventArgs e) at GalaSoft.MvvmLight.ViewModelBase.RaisePropertyChanged(String propertyName) in D:\GalaSoft\mydotnet\GalaSoft MVVM Light Toolkit\Source\V3\GalaSoft.MvvmLight\GalaSoft.MvvmLight (NET35)\ViewModelBase.cs:line 234 at Pulse.UI.ViewModels.OrderStatusViewModel.set_State(OrderStateEnum value) in C:\Serkan\Pulse Project\Pulse.UI\ViewModels\OrderStatusViewModel.cs:line 236 at Pulse.UI.ViewModels.OrderStatusViewModel.set_Status(OrderStatus value) in C:\Serkan\Pulse Project\Pulse.UI\ViewModels\OrderStatusViewModel.cs:line 80 at Pulse.UI.Common.MarketData.&lt;MessageHandler&gt;b__a(OrderStatusViewModel vm, OrderStatus m) in C:\Serkan\Pulse Project\Pulse.UI\Common\MarketData.cs:line 219 at Pulse.UI.Common.MarketData.&lt;&gt;c__DisplayClass20`2.&lt;CollectionKeeper&gt;b__1f() in C:\Serkan\Pulse Project\Pulse.UI\Common\MarketData.cs:line 333 at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler) at System.Windows.Threading.DispatcherOperation.InvokeImpl() at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state) at System.Threading.ExecutionContext.runTryCode(Object userData) at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Windows.Threading.DispatcherOperation.Invoke() at System.Windows.Threading.Dispatcher.ProcessQueue() at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean&amp; handled) at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean&amp; handled) at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler) at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG&amp; msg) at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame) at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame) at System.Windows.Application.RunDispatcher(Object ignore) at System.Windows.Application.RunInternal(Window window) at System.Windows.Application.Run(Window window) at System.Windows.Application.Run() at Pulse.UI.App.Main() in C:\Serkan\Pulse Project\Pulse.UI\obj\x86\Release\App.g.cs:line 0 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart()</StackTrace><ExceptionString>System.InvalidOperationException: Added item does not appear at given index '1'. at MS.Internal.Data.EnumerableCollectionView.ProcessCollectionChanged(NotifyCollectionChangedEventArgs args) at System.Windows.Data.CollectionView.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args) at Obtics.NCToNCC.NotifyChanged(Object sender, INCEventArgs changeArgs) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(Object rawMessage) at Obtics.Collections.Transformations.NotifyVpcTransformation`2.Notifier.NotifyChanged(Object sender, INCEventArgs changeArgs) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObjectToVP`2.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObjectToVP`2.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObjectToVP`2.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.Collections.Transformations.TranslucentTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(Object rawMessage) at Obtics.Collections.Transformations.UnorderedCascadeTransformation`2.BufferNodeCC.NotifyChanged(Object sender, INCEventArgs changeArgs) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.Collections.Transformations.TranslucentTransformationBase`3.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.Collections.Transformations.OpaqueTransformationBase`3.Release(INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(Object rawMessage) at Obtics.Collections.Transformations.UnorderedNotifyVpcTransformation`2.Notifier.NotifyChanged(Object sender, INCEventArgs changeArgs) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObjectToVP`2.Release(INCEventArgs message) at Obtics.NCSourcedObject`1.NotifyChanged(Object sender, INCEventArgs args) at Obtics.NotifyChangedReceiverTable.SendMessage(Object sender, INCEventArgs message) at Obtics.NCObservableObjectBase`1.Release(INCEventArgs message) at Obtics.NCSourcedObjectToVP`2.Release(INCEventArgs message) at Obtics.Values.Transformations.PropertyTransformation`2.Buffer_PropertyChanged(Object sender, EventArgs args) at Obtics.Values.Transformations.PropertyTransformation`2.npc_PropertyChanged(Object sender, PropertyChangedEventArgs e) at System.ComponentModel.PropertyChangedEventHandler.Invoke(Object sender, PropertyChangedEventArgs e) at GalaSoft.MvvmLight.ViewModelBase.RaisePropertyChanged(String propertyName) in D:\GalaSoft\mydotnet\GalaSoft MVVM Light Toolkit\Source\V3\GalaSoft.MvvmLight\GalaSoft.MvvmLight (NET35)\ViewModelBase.cs:line 234 at Pulse.UI.ViewModels.OrderStatusViewModel.set_State(OrderStateEnum value) in C:\Serkan\Pulse Project\Pulse.UI\ViewModels\OrderStatusViewModel.cs:line 236 at Pulse.UI.ViewModels.OrderStatusViewModel.set_Status(OrderStatus value) in C:\Serkan\Pulse Project\Pulse.UI\ViewModels\OrderStatusViewModel.cs:line 80 at Pulse.UI.Common.MarketData.&lt;MessageHandler&gt;b__a(OrderStatusViewModel vm, OrderStatus m) in C:\Serkan\Pulse Project\Pulse.UI\Common\MarketData.cs:line 219 at Pulse.UI.Common.MarketData.&lt;&gt;c__DisplayClass20`2.&lt;CollectionKeeper&gt;b__1f() in C:\Serkan\Pulse Project\Pulse.UI\Common\MarketData.cs:line 333 at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler) at System.Windows.Threading.DispatcherOperation.InvokeImpl() at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state) at System.Threading.ExecutionContext.runTryCode(Object userData) at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Windows.Threading.DispatcherOperation.Invoke() at System.Windows.Threading.Dispatcher.ProcessQueue() at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean&amp; handled) at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean&amp; handled) at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler) at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG&amp; msg) at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame) at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame) at System.Windows.Application.RunDispatcher(Object ignore) at System.Windows.Application.RunInternal(Window window) at System.Windows.Application.Run(Window window) at System.Windows.Application.Run() at Pulse.UI.App.Main() in C:\Serkan\Pulse Project\Pulse.UI\obj\x86\Release\App.g.cs:line 0 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart()</ExceptionString><DataItems><Data></Data></DataItems></Exception></TraceRecord>

New Post: Why is this collection keeps getting recreated everytime?

throb — Fri, 06 Jul 2012 08:46:52 GMT

I don't know which property is changing to cause the entire collection to update but what strikes me is that you seem to use an outer join between your grouped _orders and _quotes where you actually want to use an inner join.

With an outer join every group will need to be regarded when a relevant property of any _quote changes, as opposed to an inner join where only the associated groups will be checked.

Regs,

Thomas.

New Post: Why is this collection keeps getting recreated everytime?

stylusdotnet — Thu, 05 Jul 2012 13:37:29 GMT

        private void CreateQueries()
        {
            GridData =
                ExpressionObserver.Execute(() =>
                                               from o in _orders
                                               where o.State != OrderStateEnum.Canceled
                                               group o by o.Isin
                                               into g
                                               let germanSymbol = _referenceData.GetGermanSymbol(g.Key)
                                               let primarySymbol = _referenceData.GetPrimaryExchangeSymbol(g.Key)
                                               let name = _referenceData.GetInstrumentName(g.Key)
                                               orderby name ascending
                                               let primaryExchange = _referenceData.GetPrimaryExchangeId(g.Key)
                                               from q in _quotes
                                                   .Where(w => w.Isin == g.Key &&
                                                               w.Exchange == primaryExchange &&
                                                               w.Provider == ProviderEnum.Bloomberg).DefaultIfEmpty(
                                                                   new QuoteTickViewModel())
                                               select new ComplexRowViewModel()
                                                          {
                                                              Isin = g.Key,
                                                              Name = name,
                                                              GermanSymbol = germanSymbol,
                                                              PrimarySymbol = primarySymbol,
                                                              PrimaryExchange = new SimpleRowViewModel()
                                                                                    {
                                                                                        Ask = (decimal) q.Ask,
                                                                                        AskSize = q.AskSize,
                                                                                        Bid = (decimal) q.Bid,
                                                                                        BidSize = q.BidSize,
                                                                                        Exchange = q.Exchange,
                                                                                        Isin = q.Isin,
                                                                                        Last = (decimal) q.Last,
                                                                                        LastSize = q.LastSize,
                                                                                        LastTime = q.Time
                                                                                    },
                                                              Groupped =
                                                                  from qx in
                                                                      _quotes.Where(
                                                                          w =>
                                                                          w.Isin == g.Key &&
                                                                          w.Provider == ProviderEnum.Tradebase &&
                                                                          w.Exchange != primaryExchange)
                                                                  select new SimpleRowViewModel()
                                                                             {
                                                                                 Ask = (decimal) qx.Ask,
                                                                                 AskSize = qx.AskSize,
                                                                                 Bid = (decimal) qx.Bid,
                                                                                 BidSize = qx.BidSize,
                                                                                 Exchange = qx.Exchange,
                                                                                 Isin = qx.Isin,
                                                                                 Last = (decimal) qx.Last,
                                                                                 LastSize = qx.LastSize,
                                                                                 LastTime = qx.Time
                                                                             }
                                                          }
                        ).Cascade();
        }

As you see I got this query in my application. Top collection is orders which is almost static, but the nested Groupped collection is keeps getting updated. But insted of just updating the related properties, whole list getting recreated every update.

I was wondering if there is a solution for this ?

New Post: InvalidOperationException when removing items

steff79 — Tue, 26 Jun 2012 18:10:14 GMT

Many thanks, that did it.

New Post: InvalidOperationException when removing items

Throb — Mon, 25 Jun 2012 23:17:51 GMT

Hi,

Problem is that Select(modelItems, s => CreateViewModel(s)) uses the lambda expression both for adding and removing items. So; CreateViewModel(s) gets called when an item is added and when an item is removed. Now; if CreateViewModel(s) does not return an equal object every time it gets called with the same s then it means that a different object will be removed than was originaly added -> error.

You should create a method GetViewModel(s) instead of CreateViewModel(s), like:

TvdP.Collections.WeakValueDictionary<string,ItemViewModel> _registry = new TvdP.Collections.WeakValueDictionary<string,ItemViewModel>()

private static ItemViewModel GetViewModel(string s)
        {
            //this MUST be called in the UI thread because I access some thread-affine objects in my real application.
            return _registry.GetOrAdd(s, s2 => new ItemViewModel {Text = s2});
        }

New Post: InvalidOperationException when removing items

steff79 — Fri, 22 Jun 2012 09:16:03 GMT

Hi,

I have a scenario with a ListBox bound to a collection of ViewModels. This collection is actually a Obtics expression that binds further to a model. The model is changed by a background thread, so I use the WorkQueueOnDispatcherProvider to make sure the viewmodels are updated on the UI thread.

Adding items works perfectly fine, but removing them throws an InvalidOperationException in the ListBox (with strange message "Added item does not appear at given index").

I have no idea what I am doing wrong. Please help me.

I created a minimal example to reproduce the behaviour:

internal class MainViewModel
    {
        private readonly Model dummyModel;

        //for binding to a ListBox
        public IEnumerable<ItemViewModel> ItemCollection { get; private set; }

        public MainViewModel()
        {
            dummyModel = new Model {Items = new ObservableCollection<string>()};
            dummyModel.Items.Add("hello");
            dummyModel.Items.Add("world");

            IValueProvider<IEnumerable<string>> valueProvider =
                ExpressionObserver.Execute(() => Enumerable.Select(dummyModel.Items, s => s));

            //from what I figured out, I have to call Async() before I create the final ItemCollection expression so that
            //CreateViewModel() is called in the UI thread.
            IEnumerable<string> modelItems =
                valueProvider.Cascade().Async(new WorkQueueOnDispatcherProvider().GetWorkQueue());

            ItemCollection =
                ExpressionObserver.Execute(() => Enumerable.Select(modelItems, s => CreateViewModel(s))).Cascade();
        }

        private static ItemViewModel CreateViewModel(string s)
        {
            //this MUST be called in the UI thread because I access some thread-affine objects in my real application.
            return new ItemViewModel {Text = s};
        }

        public void StartOperation()
        {
            Task.Factory.StartNew(
                () =>
                {
                    Thread.Sleep(1000);
                    dummyModel.Items.RemoveAt(1);
                    //dummyModel.Items.Add("hello");
                });
        }
    }

    internal class ItemViewModel
    {
        public string Text { get; set; }
    }

    internal class Model
    {
        public ObservableCollection<string> Items { get; set; }
    }

And the necessary XAML part:

<Window.Resources>
        <ResourceDictionary>
            <WpfApplication1:MainViewModel x:Key="myMainViewModel">
            </WpfApplication1:MainViewModel>
        </ResourceDictionary>
    </Window.Resources>
    <StackPanel DataContext="{StaticResource ResourceKey=myMainViewModel}">
        <Button Click="Clicked">Start Remove</Button>
        <ListBox ItemsSource="{Binding Path=ItemCollection}"></ListBox>
    </StackPanel>

Source code checked in, #67974

Throb — Sun, 10 Jun 2012 22:16:28 GMT

ValueProvider methods now always return concrete objects. Obtics.BindingHelper.Concrete() method for IValueProviders in the BindingHelper library is now obsolete. WindowsBase dependencies moved to seperate library for non-silverlight build (ObticsWindowsBaseExtensions). Value transformations (not collection transformations) postpone public change notifications untill all internal work has finished. Include fixed ConcurrentHashtable library.

New Post: How do I join and aggregate two observable collections?

stylusdotnet — Wed, 14 Dec 2011 15:44:04 GMT

I'm sorry for the late answer.

My Project is not entirely unit-testable. But I can say that it's just an observablecollection for items with inotifypropertchanged interface.

There are some nullable properties in items, I wanted to check them but right now I don't have time for that, I needed quick solutions and workarounds :)

New Post: Strange behavior

throb — Thu, 08 Dec 2011 23:58:50 GMT

Hi Vincent,

Haven't found the time yet to find out what is going on.

I hope to have an answer for you soon,

Regs

Thomas.

New Post: Strange behavior

vbouzon — Wed, 07 Dec 2011 21:29:56 GMT

Hi Throb,

Have you an idea about my issue ?

Thanks

Vincent

New Post: How do I join and aggregate two observable collections?

throb — Tue, 06 Dec 2011 18:57:12 GMT

Good that you found a solution. 'join into' syntax should work though but there may always be a bug.

Could you create a unit test that isolates your problem?

Regs,

Thomas.

New Post: How do I join and aggregate two observable collections?

stylusdotnet — Tue, 06 Dec 2011 10:13:06 GMT

Sorry it was my Linq Expression. It should have been like this.

           var query = ExpressionObserver.Execute(() =>
                                                  from q in _quotes.Where(p => p.Provider == ProviderEnum.Bloomberg)
                                                  from qp in
                                                      _currencies.Where(
                                                          j => j.Isin == q.Isin && j.Exchange == q.Exchange && j.Provider == ProviderEnum.Tradebase)
                                                      .DefaultIfEmpty(new QuoteTickViewModel())
                                                  select
                                                      new
                                                          {
                                                              IsinB = q.Isin,
                                                              IsinT = qp.Isin,
                                                              ExchangeB = q.Exchange,
                                                              ExchangeT = qp.Exchange,
                                                              PriceB = q.Last,
                                                              PriceT = qp.Last,
                                                              ProviderB = q.Provider,
                                                              ProviderT = qp.Provider
                                                          }
               ).Cascade();

If I try it with a normal LINQ/SQL-Like syntax (join into) then it does not function.