1st Aura Project Layout

AuraTrader/AuraTrader.dpr

@@ -6,7 +6,9 @@ uses
   FMX.Forms,
   MainForm in 'MainForm.pas' {Form1},
   Myc.Trade.Core.DataPoint in '..\Src\Myc.Trade.Core.DataPoint.pas',
-  Myc.Trade.Ticker in '..\Src\Myc.Trade.Ticker.pas';
+  Myc.Trade.Ticker in '..\Src\Myc.Trade.Ticker.pas',
+  Myc.Aura.Module in '..\Src\Myc.Aura.Module.pas',
+  Myc.Aura.Parameter in '..\Src\Myc.Aura.Parameter.pas';
 
 {$R *.res}
 

AuraTrader/AuraTrader.dproj

@@ -135,6 +135,8 @@
         </DCCReference>
         <DCCReference Include="..\Src\Myc.Trade.Core.DataPoint.pas"/>
         <DCCReference Include="..\Src\Myc.Trade.Ticker.pas"/>
+        <DCCReference Include="..\Src\Myc.Aura.Module.pas"/>
+        <DCCReference Include="..\Src\Myc.Aura.Parameter.pas"/>
         <BuildConfiguration Include="Base">
             <Key>Base</Key>
         </BuildConfiguration>

AuraTrader/MainForm.fmx

@@ -11,85 +11,108 @@ object Form1: TForm1
   OnDestroy = FormDestroy
   DesignerMasterStyle = 0
   object Panel1: TPanel
-    Align = Top
+    Align = Client
     Size.Width = 796.00000000000000000
-    Size.Height = 529.00000000000000000
+    Size.Height = 616.00000000000000000
     Size.PlatformDefault = False
     TabOrder = 2
-    object RandomButton: TButton
-      Position.X = 697.00000000000000000
-      Position.Y = 38.00000000000000000
-      TabOrder = 0
-      Text = 'Random'
-      TextSettings.Trimming = None
-      OnClick = RandomButtonClick
-    end
-    object Path1: TPath
-      Anchors = [akLeft, akTop, akRight]
-      Position.X = 8.00000000000000000
-      Position.Y = 8.00000000000000000
-      Size.Width = 261.00000000000000000
-      Size.Height = 513.00000000000000000
+    object Layout: TFlowLayout
+      Align = Client
+      Size.Width = 627.00000000000000000
+      Size.Height = 616.00000000000000000
       Size.PlatformDefault = False
+      TabOrder = 1
+      Justify = Left
+      JustifyLastLine = Left
+      FlowDirection = LeftToRight
+      HorizontalGap = 2.00000000000000000
+      VerticalGap = 2.00000000000000000
+      OnResized = LayoutResized
     end
     object SymbolsComboBox: TComboBox
       Anchors = [akTop, akRight]
-      Position.X = 493.00000000000000000
-      Position.Y = 8.00000000000000000
-      Size.Width = 217.00000000000000000
+      Position.X = 608.00000000000000000
+      Position.Y = 16.00000000000000000
+      Size.Width = 177.00000000000000000
       Size.Height = 22.00000000000000000
       Size.PlatformDefault = False
+      TabOrder = 5
+    end
+    object RandomBox: TCheckBox
+      Anchors = [akTop, akRight]
+      Position.X = 609.00000000000000000
+      Position.Y = 46.00000000000000000
       TabOrder = 2
+      Text = 'Random'
     end
     object LoadButton: TButton
       Anchors = [akTop, akRight]
-      Position.X = 718.00000000000000000
-      Position.Y = 8.00000000000000000
+      Position.X = 641.00000000000000000
+      Position.Y = 86.00000000000000000
       Size.Width = 47.00000000000000000
       Size.Height = 22.00000000000000000
       Size.PlatformDefault = False
-      TabOrder = 3
+      TabOrder = 6
       Text = 'Load'
       TextSettings.Trimming = None
       OnClick = LoadButtonClick
     end
-    object FlowLayout: TFlowLayout
-      Position.X = 304.00000000000000000
-      Position.Y = 104.00000000000000000
-      Size.Width = 449.00000000000000000
-      Size.Height = 361.00000000000000000
-      Size.PlatformDefault = False
-      TabOrder = 5
-      Justify = Left
-      JustifyLastLine = Left
-      FlowDirection = LeftToRight
+    object RandomButton: TButton
+      Anchors = [akTop, akRight]
+      Position.X = 705.00000000000000000
+      Position.Y = 86.00000000000000000
+      TabOrder = 3
+      Text = 'Random'
+      TextSettings.Trimming = None
+      OnClick = RandomButtonClick
     end
     object ChartButton: TButton
-      Position.X = 712.00000000000000000
-      Position.Y = 72.00000000000000000
-      TabOrder = 6
+      Anchors = [akTop, akRight]
+      Position.X = 665.00000000000000000
+      Position.Y = 130.00000000000000000
+      TabOrder = 8
       Text = 'ChartButton'
       TextSettings.Trimming = None
       OnClick = ChartButtonClick
     end
     object StopButton: TButton
-      Position.X = 720.00000000000000000
-      Position.Y = 96.00000000000000000
-      TabOrder = 8
+      Anchors = [akTop, akRight]
+      Position.X = 665.00000000000000000
+      Position.Y = 160.00000000000000000
+      TabOrder = 10
       Text = 'StopButton'
       TextSettings.Trimming = None
       OnClick = StopButtonClick
     end
+    object TreeView1: TTreeView
+      Align = Left
+      Size.Width = 161.00000000000000000
+      Size.Height = 616.00000000000000000
+      Size.PlatformDefault = False
+      TabOrder = 0
+      Viewport.Width = 157.00000000000000000
+      Viewport.Height = 612.00000000000000000
+    end
+    object Splitter1: TSplitter
+      Align = Left
+      Cursor = crHSplit
+      MinSize = 20.00000000000000000
+      Position.X = 161.00000000000000000
+      Size.Width = 8.00000000000000000
+      Size.Height = 616.00000000000000000
+      Size.PlatformDefault = False
+    end
   end
   object LogMemo: TMemo
     Touch.InteractiveGestures = [Pan, LongTap, DoubleTap]
     DataDetectorTypes = []
-    Align = Client
+    Align = Bottom
+    Position.Y = 616.00000000000000000
     Size.Width = 796.00000000000000000
-    Size.Height = 311.00000000000000000
+    Size.Height = 224.00000000000000000
     Size.PlatformDefault = False
     TabOrder = 1
     Viewport.Width = 792.00000000000000000
-    Viewport.Height = 307.00000000000000000
+    Viewport.Height = 220.00000000000000000
   end
 end

AuraTrader/MainForm.pas

@@ -34,25 +34,30 @@ uses
     Myc.Signals.FMX,
     Myc.TaskManager,
     FMX.ListBox,
-    FMX.Layouts;
+    FMX.Layouts,
+    FMX.MultiView,
+    FMX.TreeView;
 
 type
     TForm1 = class(TForm)
         LogMemo: TMemo;
         Panel1: TPanel;
-        RandomButton: TButton;
-        Path1: TPath;
+        Layout: TFlowLayout;
         SymbolsComboBox: TComboBox;
+        RandomBox: TCheckBox;
         LoadButton: TButton;
-        FlowLayout: TFlowLayout;
+        RandomButton: TButton;
         ChartButton: TButton;
         StopButton: TButton;
+        TreeView1: TTreeView;
+        Splitter1: TSplitter;
         procedure RandomButtonClick(Sender: TObject);
         procedure FormCreate(Sender: TObject);
         procedure FormDestroy(Sender: TObject);
         procedure LoadButtonClick(Sender: TObject);
         procedure ChartButtonClick(Sender: TObject);
         procedure StopButtonClick(Sender: TObject);
+        procedure LayoutResized(Sender: TObject);
     private
         const
             cnt = 20;
@@ -70,6 +75,8 @@ type
         FRandom: TList<TRndItem>;
         FTerminate: TEvent;
         FLoadDone: TState;
+        function SelectedSymbol: String;
+        function SelectedStream: IDataStream<TAskBidItem>;
     public
     { Public declarations }
     published
@@ -102,7 +109,7 @@ begin
 
     FSymbols := FServer.EnumerateSymbols;
 
-    SymbolsComboBox.AddIdleHandler(
+    SymbolsComboBox.ProcessSignal(
         FSymbols.Done.Signal,
         procedure
         begin
@@ -130,10 +137,14 @@ begin
     FSymbols.WaitFor;
     FTerminate.Notify;
     TaskManager.WaitFor(FLoadDone);
-    Application.OnIdle := nil;
     FRandom.Free;
 end;
 
+procedure TForm1.LayoutResized(Sender: TObject);
+begin
+    LogMemo.Lines.Add('resize');
+end;
+
 procedure TForm1.LoadButtonClick(Sender: TObject);
 begin
     if SymbolsComboBox.ItemIndex < 0 then
@@ -142,7 +153,11 @@ begin
     var Stream := FServer.CreateStream(FSymbols.WaitFor[SymbolsComboBox.ItemIndex]);
     var Data := TDataStreamProvider.Create<TAskBidItem>(30000, 10000, Stream);
 
-    Path1.AddIdleHandler(
+    var path := TPath.Create(Self);
+    path.Parent := Layout;
+    path.Align := TAlignLayout.None;
+
+    path.ProcessSignal(
         Data.Changed,
         procedure
         begin
@@ -150,14 +165,14 @@ begin
 
             if Prices.Count > 0 then
             begin
-                Path1.BeginUpdate;
+                path.BeginUpdate;
                 try
-                    Path1.Data.Clear;
-                    Path1.Data.MoveTo(PointF(Path1.Width - 1, Prices[0].Data.Ask));
+                    path.Data.Clear;
+                    path.Data.MoveTo(PointF(path.Width - 1, Prices[0].Data.Ask));
                     for var i := 1 to Prices.Count - 1 do
-                        Path1.Data.LineTo(PointF(Path1.Width - i - 1, Prices[i].Data.Ask));
+                        path.Data.LineTo(PointF(path.Width - i - 1, Prices[i].Data.Ask));
                 finally
-                    Path1.EndUpdate;
+                    path.EndUpdate;
                 end;
             end;
         end
@@ -168,12 +183,11 @@ procedure TForm1.RandomButtonClick(Sender: TObject);
 begin
     var rnd: TRndItem;
 
-    var ass := FSymbols.WaitFor;
-    rnd.Stream := FServer.CreateStream(ass[Random(Length(FSymbols.WaitFor))]);
+    rnd.Stream := FServer.CreateStream(FSymbols.WaitFor[Random(Length(FSymbols.WaitFor))]);
     rnd.Data := TDataStreamProvider.Create<TAskBidItem>(3000, 1000, rnd.Stream);
 
     rnd.Labl := TLabel.Create(Self);
-    rnd.Labl.Parent := FlowLayout;
+    rnd.Labl.Parent := Layout;
     rnd.Labl.Align := TAlignLayout.None;
     rnd.Labl.WordWrap := false;
     rnd.Labl.Width := 300;
@@ -185,7 +199,7 @@ begin
         begin
             FRandom[idx]
                 .Labl
-                .AddIdleHandler(
+                .ProcessSignal(
                     FRandom[idx].Data.Changed,
                     procedure
                     begin
@@ -209,15 +223,14 @@ end;
 
 procedure TForm1.ChartButtonClick(Sender: TObject);
 begin
-    if SymbolsComboBox.ItemIndex < 0 then
+    var Symbol := SelectedSymbol;
+    if Symbol = '' then
         exit;
 
-    var Symbol := FSymbols.WaitFor[SymbolsComboBox.ItemIndex];
+    var currPathData := TWriteable<IObjectRef<TPathData>>.CreateWriteable.Protect;
+    var currLog := TWriteable<String>.CreateWriteable.Protect;
 
-    var currPathData := TMutable<IObjectRef<TPathData>>.CreateWriteable.Protect;
-    var currLog := TMutable<String>.CreateWriteable.Protect;
-
-    const width = 3000;
+    const width = 300;
 
     var done :=
         TaskManager.RunTask(
@@ -255,18 +268,36 @@ begin
 
     FLoadDone := TState.All([FLoadDone, done]);
 
-    LogMemo.AddIdleHandler(currLog.Changed, procedure begin LogMemo.Lines.Add(Symbol + ': ' + currLog.Value); end);
+    var path := TPath.Create(Self);
+    path.Parent := Layout;
+    path.Align := TAlignLayout.None;
 
-    Path1.AddIdleHandler(
+    path.ProcessSignal(
         currPathData.Changed,
-        procedure
+        procedure(out IsDone: Boolean)
         begin
             if currPathData.Value <> nil then
-            begin
-                Path1.Data.Assign(currPathData.Value.Obj);
-            end;
+                path.Data.Assign(currPathData.Value.Obj);
+            IsDone := done.IsSet;
         end
     );
 end;
 
+function TForm1.SelectedStream: IDataStream<TAskBidItem>;
+begin
+    var sym := SelectedSymbol;
+    if sym = '' then
+        exit(nil);
+    Result := FServer.CreateStream(sym);
+end;
+
+function TForm1.SelectedSymbol: String;
+begin
+    Result := '';
+    if RandomBox.IsChecked then
+        Result := FSymbols.WaitFor[Random(Length(FSymbols.WaitFor))]
+    else if SymbolsComboBox.ItemIndex >= 0 then
+        Result := FSymbols.WaitFor[SymbolsComboBox.ItemIndex];
+end;
+
 end.

Src/Myc.Aura.Module.pas

@@ -0,0 +1,412 @@
+(*
+---
+## Aura Module API Documentation
+
+This unit defines the core interfaces and records for the Aura system, designed for robust algorithmic trading strategy development,
+backtesting, and optimization. It encapsulates key concepts for defining strategies, executing backtests, performing walk-forward
+optimizations, and conducting statistical robustness analysis via Monte Carlo simulations.
+
+---
+
+### Core Interfaces and Records
+
+#### `IAuraObject`
+Base interface for all Aura objects, providing a common `Name` property for identification.
+  * `Name`: A writeable string representing the object's name.
+
+#### `TAuraArray<T: IAuraObject>`
+A record providing a mutable, observable array-like collection for `IAuraObject` instances. It wraps a `TWriteable<TArray<T>>` and offers basic array manipulation methods.
+  * `Items`: A writeable array of `IAuraObject` instances.
+  * `Insert(Idx: Integer; const Item: T)`: Inserts an item at a specified index.
+  * `Delete(Idx: Integer)`: Deletes an item at a specified index.
+  * `IndexOf(const Item: T)`: Returns the index of a given item.
+
+#### `IAuraLiveObject`
+Extends `IAuraObject` for entities that are dynamically produced and actively executing operations, providing logging capabilities and a running status.
+  * `Log`: A `TStrings` object for logging events and status messages.
+  * `IsRunning`: Indicates whether the object is currently active.
+
+#### `IAuraNode`
+Extends `IAuraObject` for objects that can be part of a hierarchical structure and can be serialized.
+  * `Caption`: A human-readable representation of the object's name.
+  * `Serialize(const Write: TJsonWriter)`: Serializes the object's state to a JSON writer.
+
+#### `IAuraChilds<T: IAuraNode>`
+A generic interface for `IAuraNode`s that can have child nodes, enabling hierarchical organization within the Aura system.
+  * `Items`: A `TAuraArray` containing the child nodes.
+
+#### `TAuraParameterDef`
+Defines the metadata for a single strategy parameter, including its name, type, and default value.
+  * `Name`: The name of the parameter.
+  * `ParamType`: The data type of the parameter (e.g., integer, float, string, UTC time).
+  * `DefaultValue`: The default value for the parameter, stored as a `TAuraParameterValue`.
+
+#### `TAuraParameterRecordDef`
+Represents a collection of `TAuraParameterDef` records, defining all parameters for a specific strategy. This is an alias for `TArray<TAuraParameterDef>`.
+
+#### `IAuraBot`
+An interface representing an instance that executes a trading strategy with given parameters over a specified time period.
+  * `PnL`: A mutable data series representing the Profit and Loss (PnL) curve of the bot's execution.
+
+#### `IAuraStrategy`
+Defines a trading strategy, providing methods to create `IAuraBot` instances and specifying its parameter structure.
+  * `CreateBot(const Parameters: TArray<TAuraParameterValue>; StartTime, EndTime: TDateTime)`: Creates and returns an `IAuraBot` instance configured with the given parameters and time range.
+  * `ParameterRecordDef`: Defines the set of parameters expected by this strategy.
+
+#### `TAuraTradePerformance`
+A record encapsulating key performance metrics from a backtest or optimization run.
+  * `PnL`: Total Profit and Loss.
+  * `SharpeRatio`: Risk-adjusted return.
+  * `MaxDrawdown`: Maximum peak-to-trough decline.
+  * `ProfitFactor`: Ratio of gross profits to gross losses.
+  * `CalmarRatio`: Annualized return divided by the maximum drawdown.
+  * `WinRate`: Percentage of winning trades.
+
+#### `TAuraMonteCarloResult`
+Stores the results of a Monte Carlo simulation, providing a probabilistic distribution of `TAuraTradePerformance` outcomes.
+  * `Percentile`: An array of `TAuraTradePerformance` records, sorted by PnL and distributed into 10% percentiles, allowing for statistical risk assessment.
+
+#### `IAuraTradeResult`
+Represents the comprehensive outcome of a trade simulation (e.g., from a backtest or optimization), including performance metrics, trade details, and the ability to perform Monte Carlo analysis.
+  * `Performance`: The `TAuraTradePerformance` metrics for this result.
+  * `Trades`: A `TDataSeries<Double>` representing the PnLs of individual trades, serving as the basis for Monte Carlo simulation.
+  * `CalcMonteCarloSimulation(Steps: Integer)`: Asynchronously performs a Monte Carlo simulation on the `Trades` data, returning a `TFuture` that resolves to a `TAuraMonteCarloResult`.
+
+#### `TAuraTimeRange`
+A record defining a specific time window with a start and end date/time.
+  * `StartTime`: The start of the time range.
+  * `EndTime`: The end of the time range.
+
+#### `IAuraBacktest`
+An interface for executing a single backtest of a trading strategy.
+  * `BacktestResult`: A `TFuture` that resolves to the `IAuraTradeResult` of this backtest.
+  * `Bot`: The `IAuraBot` instance executing the backtest.
+  * `Parameters`: The specific parameters used for this backtest.
+  * `Strategy`: The `IAuraStrategy` being backtested.
+  * `TimeRange`: The historical time window over which the backtest is conducted.
+
+#### `IAuraParameterOptimization`
+Represents a single optimization slot (window) within a Walk-Forward Optimization process. It manages the execution of multiple in-sample backtests to find optimal parameters, followed by an out-of-sample test.
+  * `InSampleTests`: A mutable array of `IAuraBacktest` instances representing the backtests run during the in-sample optimization phase. New tests are added, and less optimal ones may be removed.
+  * `OutOfSampleTest`: A mutable `IAuraBacktest` representing the test run with the best-fit parameters from the in-sample optimization on the subsequent out-of-sample data.
+
+#### `IAuraWalkForwardOptimizer`
+Orchestrates the entire Walk-Forward Optimization (WFO) process, coordinating multiple `IAuraParameterOptimization` slots sequentially to test strategy adaptability across various market phases.
+  * `OptimizationResult`: A `TFuture` that resolves to the aggregated `IAuraTradeResult` representing the combined performance of all out-of-sample tests.
+  * `Slot`: An array of `IAuraParameterOptimization` instances, each representing a distinct optimization window.
+
+#### `IAuraParameterNode`
+Represents a single configurable parameter for optimization algorithms, allowing its value to be set and observed.
+  * `Value`: A mutable `TAuraParameterValue` representing the parameter's current setting.
+
+#### `IAuraParameterList`
+An alias for `IAuraChilds<IAuraParameterNode>`, providing a structured way to manage collections of `IAuraParameterNode`s.
+
+#### `IAuraStudy`
+Base interface for all types of strategy analysis studies (e.g., single backtests, parameter optimizations, WFOs).
+  * `EventLog`: A `TStrings` object for logging events specific to the study.
+  * `Strategy`: The `IAuraStrategy` that is the subject of the study.
+
+#### `TAuraParameterRange`
+Defines the allowed range for a strategy parameter during optimization.
+  * `MinValue`: The minimum allowed value for the parameter, as a `TAuraParameterValue`.
+  * `MaxValue`: The maximum allowed value for the parameter, as a `TAuraParameterValue`.
+
+#### `IAuraBacktestStudy`
+A specialized `IAuraStudy` for setting up and initiating a single backtest.
+  * `TimeRange`: The `TAuraTimeRange` for the backtest.
+  * `Start`: Initiates and returns an `IAuraBacktest` instance.
+
+#### `IAuraParameterOptimizationStudy`
+A specialized `IAuraStudy` for configuring and initiating a parameter optimization process (e.g., using genetic algorithms) over a specific time range.
+  * `Parameters`: An `IAuraChilds` collection of `IAuraParameterNode`s defining the configuration parameters for the optimization algorithm itself (e.g., max generations, population size).
+  * `TimeRange`: The `TAuraTimeRange` for the optimization.
+  * `Start`: Initiates and returns an `IAuraParameterOptimization` instance.
+
+#### `IAuraWFOStudy`
+A specialized `IAuraStudy` for configuring and initiating a Walk-Forward Optimization process.
+  * `ParameterRange[Idx: Integer]`: A writeable `TAuraParameterRange` defining the search space for each strategy parameter during the optimization phases.
+  * `NumSlots`: A writeable integer indicating the number of time windows (slots) for the WFO.
+  * `Start`: Initiates and returns an `IAuraWalkForwardOptimizer` instance.
+
+#### `IAuraTradingMode`
+An enumeration defining different operational modes for a trading environment.
+  * `tmTesting`: Mode for historical backtesting.
+  * `tmSim`: Mode for simulated live trading (paper trading).
+  * `tmLive`: Mode for actual live trading.
+
+#### `IAuraWorkspace`
+Represents the scope of a complete testing and trading environment, containing various studies and managing the overall trading mode.
+  * `WalkForwardAnalysis`: An `IAuraChilds` collection of `IAuraWFOStudy` instances.
+  * `Backtests`: An `IAuraChilds` collection of `IAuraBacktestStudy` instances.
+  * `ParameterOptimizations`: An `IAuraChilds` collection of `IAuraParameterOptimizationStudy` instances.
+  * `TradingMode`: A writeable `IAuraTradingMode` indicating the current operational mode.
+
+#### `IAuraStrategyFactory`
+An interface for creating instances of `IAuraStrategy`. Used for managing available strategy types.
+  * `CreateStrategy`: Creates and returns a new `IAuraStrategy` instance.
+
+#### `IAuraApplication`
+The application-level singleton, serving as the root for serialization and providing access to all defined strategies and workspaces.
+  * `Strategies`: An `IAuraChilds` collection of `IAuraStrategyFactory` instances.
+  * `Workspaces`: An `IAuraChilds` collection of `IAuraWorkspace` instances.
+
+---
+*)
+
+unit Myc.Aura.Module;
+
+interface
+
+uses
+    System.JSON.Writers,
+    System.Classes,
+    Myc.Signals,
+    Myc.Futures,
+    Myc.Lazy,
+    Myc.Trade.DataPoint,
+    Myc.Aura.Parameter;
+
+type
+    // Base class of all Aura objects
+    IAuraObject = interface
+        function GetName: TWriteable<String>;
+        property Name: TWriteable<String> read GetName;
+    end;
+
+    TAuraArray<T: IAuraObject> = record
+    private
+        FArray: TWriteable<TArray<T>>;
+        function GetItems: TWriteable<TArray<T>>;
+    public
+        procedure Insert(Idx: Integer; const Item: T);
+        procedure Delete(Idx: Integer);
+        function IndexOf(const Item: T): Integer;
+        property Items: TWriteable<TArray<T>> read GetItems;
+    end;
+
+    // Base class for objects that are dynamically produced and are executing
+    IAuraLiveObject = interface(IAuraObject)
+        function GetLog: TStrings;
+        function IsRunning: Boolean;
+        property Log: TStrings read GetLog;
+    end;
+
+    IAuraNode = interface(IAuraObject)
+        function GetCaption: string;
+        // Serialize the whole project
+        procedure Serialize(const Write: TJsonWriter);
+        // Pretty print of Name
+        property Caption: string read GetCaption;
+    end;
+
+    IAuraChilds<T: IAuraNode> = interface(IAuraNode)
+        function GetItems: TAuraArray<T>;
+        // Nodes to add as childs in hierarchical representation
+        property Items: TAuraArray<T> read GetItems;
+    end;
+
+    TAuraParameterDef = record
+        Name: String;
+        ParamType: TAuraParameterType;
+        DefaultValue: TAuraParameterValue;
+    end;
+
+    TAuraParameterRecordDef = TArray<TAuraParameterDef>;
+
+    // A bot executes a strategy
+    IAuraBot = interface(IAuraLiveObject)
+        function GetPnL: TMutable<TDataSeries<Double>>;
+        // Zero-based PnL series
+        property PnL: TMutable<TDataSeries<Double>> read GetPnL;
+    end;
+
+    // A strategy creates a bot that executes that strategy with given parameters and within a given time slot.
+    IAuraStrategy = interface(IAuraObject)
+        function CreateBot(const Parameters: TArray<TAuraParameterValue>; StartTime, EndTime: TDateTime): IAuraBot;
+        function GetParameterRecordDef: TAuraParameterRecordDef;
+        // Defines the parameters of this strategy
+        property ParameterRecordDef: TAuraParameterRecordDef read GetParameterRecordDef;
+    end;
+
+    // The performance of a backtest or walk forward optimization
+    TAuraTradePerformance = record
+        PnL: Double;
+        SharpeRatio, MaxDrawdown, ProfitFactor, CalmarRatio, WinRate: Double;
+    end;
+
+    TAuraMonteCarloResult = record
+        // Performance sorted by PnL and distributed to percentiles of 10% each
+        Percentile: array[0..10] of TAuraTradePerformance;
+    end;
+
+    IAuraTradeResult = interface
+        function GetPerformance: TAuraTradePerformance;
+        function GetTrades: TDataSeries<Double>;
+        // Perform Monte Carlo Simulation and generate performance distribution
+        function CalcMonteCarloSimulation(Steps: Integer): TFuture<TAuraMonteCarloResult>;
+        // PnLs of each trade = Equity curve
+        property Trades: TDataSeries<Double> read GetTrades;
+        // The performance of this equity curve
+        property Performance: TAuraTradePerformance read GetPerformance;
+    end;
+
+    TAuraTimeRange = record
+        StartTime: TDateTime;
+        EndTime: TDateTime;
+    end;
+
+    // Backtesting
+    IAuraBacktest = interface(IAuraLiveObject)
+        function GetParameters: TArray<TAuraParameterValue>;
+        function GetStrategy: IAuraStrategy;
+        function GetBot: IAuraBot;
+        function GetBacktestResult: TFuture<IAuraTradeResult>;
+        function GetTimeRange: TAuraTimeRange;
+        // The bot executing the backtest (generated by Strategy.CreateBot with the given parameters).
+        property Bot: IAuraBot read GetBot;
+        // The backtest result
+        property BacktestResult: TFuture<IAuraTradeResult> read GetBacktestResult;
+        // The strategy parameters for this backtest
+        property Parameters: TArray<TAuraParameterValue> read GetParameters;
+        // The strategy to backtest
+        property Strategy: IAuraStrategy read GetStrategy;
+        // The tested time window
+        property TimeRange: TAuraTimeRange read GetTimeRange;
+    end;
+
+    // Generates parameter sets using genetic algorithms (or other techniques).
+    // Executes backtests and finds the best run by evaluating the backtest results.
+    IAuraParameterOptimization = interface(IAuraLiveObject)
+        function GetInSampleTests: TMutable<TArray<IAuraBacktest>>;
+        function GetOutOfSampleTest: TMutable<IAuraBacktest>;
+        // The running in-sample-tests. New tests will be added until the optimization stops.
+        property InSampleTests: TMutable<TArray<IAuraBacktest>> read GetInSampleTests;
+        // After in sample testing is finished, the out-of-sample-test with the best parameter set is executed.
+        property OutOfSampleTest: TMutable<IAuraBacktest> read GetOutOfSampleTest;
+    end;
+
+    // Walk-Forward-Optimizer
+    IAuraWalkForwardOptimizer = interface(IAuraLiveObject)
+        function GetOptimizationResult: TFuture<IAuraTradeResult>;
+        function GetSlot: TArray<IAuraParameterOptimization>;
+        // When optimization is ready, this will contain the result for the combined WFO slots
+        property OptimizationResult: TFuture<IAuraTradeResult> read GetOptimizationResult;
+        // The concurrently running optimization slots
+        property Slot: TArray<IAuraParameterOptimization> read GetSlot;
+    end;
+
+    // A Parameter Value
+    IAuraParameterNode = interface(IAuraNode)
+        function GetValue: TMutable<TAuraParameterValue>;
+        property Value: TMutable<TAuraParameterValue> read GetValue;
+    end;
+    IAuraParameterList = IAuraChilds<IAuraParameterNode>;
+
+    // A study on a strategy
+    IAuraStudy = interface(IAuraNode)
+        function GetEventLog: TStrings;
+        function GetStrategy: IAuraStrategy;
+        property EventLog: TStrings read GetEventLog;
+        // The Strategy to optimize
+        property Strategy: IAuraStrategy read GetStrategy;
+    end;
+
+    TAuraParameterRange = record
+        MinValue, MaxValue: TAuraParameterValue;
+    end;
+
+    // Study on a single backtest
+    IAuraBacktestStudy = interface(IAuraStudy)
+        function GetTimeRange: TAuraTimeRange;
+        function Start: IAuraBacktest;
+        property TimeRange: TAuraTimeRange read GetTimeRange;
+    end;
+
+    // Study parameter optimization
+    IAuraParameterOptimizationStudy = interface(IAuraStudy)
+        function GetParameters: IAuraChilds<IAuraParameterNode>;
+        function GetTimeRange: TAuraTimeRange;
+        function Start: IAuraParameterOptimization;
+        // Depending on the implementation this may be MaxGenerations, PopulationSize, Mutations, etc
+        property Parameters: IAuraChilds<IAuraParameterNode> read GetParameters;
+        property TimeRange: TAuraTimeRange read GetTimeRange;
+    end;
+
+    // Walk forward optimization
+    IAuraWFOStudy = interface(IAuraStudy)
+        function GetParameterRange(Idx: Integer): TWriteable<TAuraParameterRange>;
+        function GetNumSlots: TWriteable<Integer>;
+        // Starts WalkForwardOptimizer with the given number of NumSlots.
+        function Start: IAuraWalkForwardOptimizer;
+        // A list of parameter values to test, one for each parameter in the Strategy's parameter definition.
+        // This defines the parameter space for optimization algorithms.
+        property ParameterRange[Idx: Integer]: TWriteable<TAuraParameterRange> read GetParameterRange;
+        // Number of time slots (windows) to test.
+        property NumSlots: TWriteable<Integer> read GetNumSlots;
+    end;
+
+    IAuraTradingMode = (tmTesting, tmSim, tmLive);
+
+    // Repesents the scope of a workspace
+    IAuraWorkspace = interface(IAuraNode)
+        function GetWalkForwardAnalysis: IAuraChilds<IAuraWFOStudy>;
+        function GetBacktests: IAuraChilds<IAuraBacktestStudy>;
+        function GetParameterOptimizations: IAuraChilds<IAuraParameterOptimizationStudy>;
+        function GetTradingMode: TWriteable<IAuraTradingMode>;
+        property WalkForwardAnalysis: IAuraChilds<IAuraWFOStudy> read GetWalkForwardAnalysis;
+        property Backtests: IAuraChilds<IAuraBacktestStudy> read GetBacktests;
+        property ParameterOptimizations: IAuraChilds<IAuraParameterOptimizationStudy> read GetParameterOptimizations;
+        property TradingMode: TWriteable<IAuraTradingMode> read GetTradingMode;
+    end;
+
+    IAuraStrategyFactory = interface(IAuraNode)
+        function CreateStrategy: IAuraStrategy;
+    end;
+
+    // Application singleton, the root for serialization
+    IAuraApplication = interface(IAuraNode)
+        function GetStrategies: IAuraChilds<IAuraStrategyFactory>;
+        function GetWorkspaces: IAuraChilds<IAuraWorkspace>;
+        property Strategies: IAuraChilds<IAuraStrategyFactory> read GetStrategies;
+        property Workspaces: IAuraChilds<IAuraWorkspace> read GetWorkspaces;
+    end;
+
+implementation
+
+uses
+    System.Generics.Collections;
+
+procedure TAuraArray<T>.Delete(Idx: Integer);
+begin
+    if Idx < 0 then
+        exit;
+
+    var Arr: TArray<T>;
+    SetLength(Arr, Length(FArray.Value) - 1);
+    TArray.Copy<T>(FArray.Value, Arr, 0, 0, Idx - 1);
+    TArray.Copy<T>(FArray.Value, Arr, Idx + 1, Idx, High(Arr) - Idx);
+    FArray.Value := Arr;
+end;
+
+procedure TAuraArray<T>.Insert(Idx: Integer; const Item: T);
+begin
+    var Arr: TArray<T>;
+    SetLength(Arr, Length(FArray.Value) + 1);
+    TArray.Copy<T>(FArray.Value, Arr, 0, 0, Idx - 1);
+    Arr[Idx] := Item;
+    TArray.Copy<T>(FArray.Value, Arr, Idx, Idx + 1, High(Arr) - Idx);
+    FArray.Value := Arr;
+end;
+
+function TAuraArray<T>.GetItems: TWriteable<TArray<T>>;
+begin
+    Result := FArray;
+end;
+
+function TAuraArray<T>.IndexOf(const Item: T): Integer;
+begin
+    Result := TArray.IndexOf<T>(FArray.Value, Item);
+end;
+
+end.

Src/Myc.Aura.Parameter.pas

@@ -0,0 +1,151 @@
+unit Myc.Aura.Parameter;
+
+interface
+
+type
+    TAuraParameterType = (apNone, apInteger, apFloat, apString, apUTC);
+
+    TAuraParameterValue = record
+    private
+        FKind: TAuraParameterType;
+        FPtr: Pointer;
+        function GetAsInteger: Int64;
+        procedure SetAsInteger(const Value: Int64);
+        procedure SetKind(Kind: TAuraParameterType); inline;
+        procedure FreeValue;
+        function GetAsFloat: Double;
+        function GetAsString: string;
+        function GetAsUTC: TDateTime;
+        procedure SetAsFloat(const Value: Double);
+        procedure SetAsString(const Value: string);
+        procedure SetAsUTC(const Value: TDateTime);
+    public
+        class operator Initialize(out Dest: TAuraParameterValue);
+        class operator Finalize(var Dest: TAuraParameterValue);
+        class operator Assign(var Dest: TAuraParameterValue; const [ref] Src: TAuraParameterValue);
+        property AsInteger: Int64 read GetAsInteger write SetAsInteger;
+        property AsFloat: Double read GetAsFloat write SetAsFloat;
+        property AsString: string read GetAsString write SetAsString;
+        property AsUTC: TDateTime read GetAsUTC write SetAsUTC;
+    end;
+
+implementation
+
+{ TAuraParameterValue }
+
+function TAuraParameterValue.GetAsInteger: Int64;
+begin
+    SetKind(apInteger);
+    if FPtr = nil then
+        exit(0);
+    Result := Int64(FPtr^);
+end;
+
+procedure TAuraParameterValue.SetAsInteger(const Value: Int64);
+begin
+    SetKind(apInteger);
+    if FPtr = nil then
+        GetMem(FPtr, sizeof(Int64));
+    Int64(FPtr^) := Value;
+end;
+
+procedure TAuraParameterValue.SetKind(Kind: TAuraParameterType);
+begin
+    if FKind <> Kind then
+    begin
+        FreeValue;
+        FKind := Kind;
+        FPtr := nil;
+    end;
+end;
+
+class operator TAuraParameterValue.Assign(var Dest: TAuraParameterValue; const [ref] Src: TAuraParameterValue);
+begin
+    case Src.FKind of
+        apInteger: Dest.AsInteger := Src.AsInteger;
+        apFloat: Dest.AsInteger := Src.AsInteger;
+        apString: Dest.AsString := Src.AsString;
+        apUTC: Dest.AsUTC := Src.AsUTC;
+    end;
+end;
+
+class operator TAuraParameterValue.Finalize(var Dest: TAuraParameterValue);
+begin
+    if Dest.FPtr <> nil then
+        FreeMem(Dest.FPtr);
+end;
+
+class operator TAuraParameterValue.Initialize(out Dest: TAuraParameterValue);
+begin
+    Dest.FPtr := nil;
+    Dest.FKind := apInteger;
+end;
+
+procedure TAuraParameterValue.FreeValue;
+begin
+    if FPtr <> nil then
+    begin
+        case FKind of
+            apInteger, apFloat: FreeMem(FPtr);
+            apString:
+            begin
+                String(FPtr^) := '';
+                FreeMem(FPtr);
+            end;
+        end;
+        FPtr := nil;
+    end;
+end;
+
+function TAuraParameterValue.GetAsFloat: Double;
+begin
+    SetKind(apFloat);
+    if FPtr = nil then
+        exit(0);
+    Result := Double(FPtr^);
+end;
+
+function TAuraParameterValue.GetAsString: string;
+begin
+    SetKind(apString);
+    if FPtr = nil then
+        exit('');
+    Result := String(FPtr^);
+end;
+
+function TAuraParameterValue.GetAsUTC: TDateTime;
+begin
+    SetKind(apUTC);
+    if FPtr = nil then
+        exit(0);
+    Result := TDateTime(FPtr^);
+end;
+
+procedure TAuraParameterValue.SetAsFloat(const Value: Double);
+begin
+    SetKind(apFloat);
+    if FPtr = nil then
+        GetMem(FPtr, sizeof(Double));
+    Double(FPtr^) := Value;
+end;
+
+procedure TAuraParameterValue.SetAsString(const Value: string);
+begin
+    SetKind(apString);
+    if FPtr = nil then
+    begin
+        GetMem(FPtr, sizeof(String));
+        FillChar(FPtr^, sizeof(String), 0);
+    end;
+    String(FPtr^) := Value;
+end;
+
+procedure TAuraParameterValue.SetAsUTC(const Value: TDateTime);
+begin
+    SetKind(apUTC);
+    if FPtr = nil then
+        GetMem(FPtr, sizeof(TDateTime));
+    TDateTime(FPtr^) := Value;
+end;
+
+end.

Src/Myc.Core.Lazy.pas

@@ -13,7 +13,6 @@ type
     private
         function GetChanged: TSignal;
         function GetValue: T;
-        function GetWriter: TMutable<T>.IWriter;
     end;
 
     TMycMutableBase<T> = class(TInterfacedObject, TMutable<T>.IMutable)
@@ -21,7 +20,6 @@ type
         FChanged: TEvent;
         FChangeState: TSignal.TSubscription;
         function GetChanged: TSignal;
-        function GetWriter: TMutable<T>.IWriter;
     protected
         function GetValue: T; virtual; abstract;
     public
@@ -38,14 +36,13 @@ type
         constructor Create(const AChanged: TSignal; const AProc: TFunc<T>);
     end;
 
-    TMycWriteableMutable<T> = class(TInterfacedObject, TMutable<T>.IMutable, TMutable<T>.IWriter)
+    TMycWriteableMutable<T> = class(TInterfacedObject, TMutable<T>.IMutable, TWriteable<T>.IWriteable)
     private
         FValue: T;
         FChanged: TEvent;
     protected
         function GetChanged: TSignal;
         function GetValue: T;
-        function GetWriter: TMutable<T>.IWriter;
         function Exchange(const Value: T): T;
     public
         constructor Create(const AValue: T);
@@ -81,24 +78,26 @@ type
         constructor Create(const AChanged: TSignal.ISignal; const AProc: TFunc<T>);
     end;
 
-    TMycProtectedMutable<T> = class(TInterfacedObject, TMutable<T>.IMutable, TMutable<T>.IWriter)
+    TMycProtectedMutable<T> = class(TInterfacedObject, TMutable<T>.IMutable, TWriteable<T>.IWriteable)
     private
-        FMutable: TMutable<T>.IMutable;
+        FWriteable: TWriteable<T>.IWriteable;
         FLock: Integer;
     protected
         function Exchange(const Value: T): T;
         function GetChanged: TSignal;
         function GetValue: T;
-        function GetWriter: TMutable<T>.IWriter;
         procedure Lock; inline;
         procedure Release; inline;
     public
-        constructor Create(const AMutable: TMutable<T>.IMutable);
+        constructor Create(const AWriteable: TWriteable<T>.IWriteable);
         procedure SetValue(const Value: T);
     end;
 
 implementation
 
+uses
+    System.Generics.Defaults;
+
 { TMycNullMutable<T> }
 
 function TMycNullMutable<T>.GetChanged: TSignal;
@@ -111,11 +110,6 @@ begin
     Result := Default(T);
 end;
 
-function TMycNullMutable<T>.GetWriter: TMutable<T>.IWriter;
-begin
-    Result := nil;
-end;
-
 { TMycMutableBase<T> }
 
 constructor TMycMutableBase<T>.Create(const AChanged: TSignal);
@@ -136,11 +130,6 @@ begin
     Result := FChanged.Signal;
 end;
 
-function TMycMutableBase<T>.GetWriter: TMutable<T>.IWriter;
-begin
-    Result := nil;
-end;
-
 { TMycWriteableMutable<T> }
 
 constructor TMycWriteableMutable<T>.Create(const AValue: T);
@@ -166,15 +155,13 @@ begin
     Result := FValue;
 end;
 
-function TMycWriteableMutable<T>.GetWriter: TMutable<T>.IWriter;
-begin
-    Result := Self;
-end;
-
 procedure TMycWriteableMutable<T>.SetValue(const Value: T);
 begin
-    FValue := Value;
-    FChanged.Notify;
+    if not TEqualityComparer<T>.Default.Equals(FValue, Value) then
+    begin
+        FValue := Value;
+        FChanged.Notify;
+    end;
 end;
 
 { TMycNullLazy<T> }
@@ -248,18 +235,17 @@ end;
 
 { TMycProtectedMutable<T> }
 
-constructor TMycProtectedMutable<T>.Create(const AMutable: TMutable<T>.IMutable);
+constructor TMycProtectedMutable<T>.Create(const AWriteable: TWriteable<T>.IWriteable);
 begin
     inherited Create;
-    FMutable := AMutable;
+    FWriteable := AWriteable;
 end;
 
 function TMycProtectedMutable<T>.Exchange(const Value: T): T;
 begin
     Lock;
     try
-        Assert(FMutable.Writer <> nil);
-        Result := FMutable.Writer.Exchange(Value);
+        Result := FWriteable.Exchange(Value);
     finally
         Release;
     end;
@@ -267,26 +253,19 @@ end;
 
 function TMycProtectedMutable<T>.GetChanged: TSignal;
 begin
-    Result := FMutable.Changed;
+    Result := FWriteable.Changed;
 end;
 
 function TMycProtectedMutable<T>.GetValue: T;
 begin
     Lock;
     try
-        Result := FMutable.Value;
+        Result := FWriteable.Value;
     finally
         Release;
     end;
 end;
 
-function TMycProtectedMutable<T>.GetWriter: TMutable<T>.IWriter;
-begin
-    Result := nil;
-    if FMutable.Writer <> nil then
-        Result := Self;
-end;
-
 procedure TMycProtectedMutable<T>.Lock;
 begin
     while AtomicExchange(FLock, 1) = 1 do
@@ -302,8 +281,7 @@ procedure TMycProtectedMutable<T>.SetValue(const Value: T);
 begin
     Lock;
     try
-        Assert(FMutable.Writer <> nil);
-        FMutable.Writer.SetValue(Value);
+        FWriteable.SetValue(Value);
     finally
         Release;
     end;

Src/Myc.Lazy.pas

@@ -9,20 +9,13 @@ uses
 type
     TMutable<T> = record
         type
-            IWriter = interface
-                procedure SetValue(const Value: T);
-                function Exchange(const Value: T): T;
-            end;
-
             IMutable = interface
                 {$REGION 'property access'}
                 function GetChanged: TSignal;
                 function GetValue: T;
-                function GetWriter: IWriter;
                 {$ENDREGION}
                 property Changed: TSignal read GetChanged;
                 property Value: T read GetValue;
-                property Writer: IWriter read GetWriter;
             end;
 
     {$REGION 'private'}
@@ -34,9 +27,7 @@ type
     private
         FMutable: IMutable;
         function GetChanged: TSignal; inline;
-        function GetIsWriteable: Boolean;
         function GetValue: T; inline;
-        procedure SetValue(const Value: T);
     {$ENDREGION}
     public
         constructor Create(const AMutable: IMutable);
@@ -47,13 +38,36 @@ type
         class property Null: IMutable read FNull;
 
         class function Construct(const Changing: TSignal; const Proc: TFunc<T>): TMutable<T>; overload; static;
-        class function CreateWriteable: TMutable<T>; overload; static;
 
-        function Protect: TMutable<T>;
+        property Value: T read GetValue;
+        property Changed: TSignal read GetChanged;
+    end;
+
+    TWriteable<T> = record
+        type
+            IWriteable = interface(TMutable<T>.IMutable)
+                procedure SetValue(const Value: T);
+                function Exchange(const Value: T): T;
+            end;
+
+    {$REGION 'private'}
+    private
+        FWriteable: IWriteable;
+        function GetChanged: TSignal; inline;
+        function GetValue: T; inline;
+        procedure SetValue(const Value: T);
+    {$ENDREGION}
+    public
+        constructor Create(const AWriteable: IWriteable);
+        class operator Implicit(const A: IWriteable): TWriteable<T>; overload;
+        class operator Implicit(const A: TWriteable<T>): IWriteable; overload;
+
+        class function CreateWriteable: TWriteable<T>; overload; static;
+
+        function Protect: TWriteable<T>;
 
         property Value: T read GetValue write SetValue;
         property Changed: TSignal read GetChanged;
-        property IsWriteable: Boolean read GetIsWriteable;
     end;
 
     TLazy<T> = record
@@ -114,40 +128,16 @@ begin
     Result := TMycFuncMutable<T>.Create(Changing, Proc);
 end;
 
-class function TMutable<T>.CreateWriteable: TMutable<T>;
-begin
-    Result := TMycWriteableMutable<T>.Create(Default(T));
-end;
-
 function TMutable<T>.GetChanged: TSignal;
 begin
     Result := FMutable.Changed;
 end;
 
-function TMutable<T>.GetIsWriteable: Boolean;
-begin
-    Result := Assigned(FMutable.Writer);
-end;
-
 function TMutable<T>.GetValue: T;
 begin
     Result := FMutable.Value;
 end;
 
-function TMutable<T>.Protect: TMutable<T>;
-begin
-    if not (FMutable is TMycProtectedMutable<T>) then
-        Result := TMycProtectedMutable<T>.Create(FMutable)
-    else
-        Result := FMutable;
-end;
-
-procedure TMutable<T>.SetValue(const Value: T);
-begin
-    Assert(IsWriteable);
-    FMutable.Writer.SetValue(Value);
-end;
-
 class operator TMutable<T>.Implicit(const A: TMutable<T>): IMutable;
 begin
     Result := A.FMutable;
@@ -212,4 +202,50 @@ begin
     Dest.FLazy := FNull;
 end;
 
+{ TWriteable<T> }
+
+constructor TWriteable<T>.Create(const AWriteable: IWriteable);
+begin
+    FWriteable := AWriteable;
+    Assert(Assigned(FWriteable));
+end;
+
+class function TWriteable<T>.CreateWriteable: TWriteable<T>;
+begin
+    Result := TMycWriteableMutable<T>.Create(Default(T));
+end;
+
+function TWriteable<T>.GetChanged: TSignal;
+begin
+    Result := FWriteable.Changed;
+end;
+
+function TWriteable<T>.GetValue: T;
+begin
+    Result := FWriteable.Value;
+end;
+
+function TWriteable<T>.Protect: TWriteable<T>;
+begin
+    if not (FWriteable is TMycProtectedMutable<T>) then
+        Result := TMycProtectedMutable<T>.Create(FWriteable)
+    else
+        Result := FWriteable;
+end;
+
+procedure TWriteable<T>.SetValue(const Value: T);
+begin
+    FWriteable.SetValue(Value);
+end;
+
+class operator TWriteable<T>.Implicit(const A: IWriteable): TWriteable<T>;
+begin
+    Result.Create(A);
+end;
+
+class operator TWriteable<T>.Implicit(const A: TWriteable<T>): IWriteable;
+begin
+    Result := A.FWriteable;
+end;
+
 end.

Src/Myc.Signals.FMX.pas

@@ -5,72 +5,145 @@ interface
 uses
     System.Classes,
     System.SysUtils,
+    System.Generics.Collections,
+    System.Diagnostics,
     System.Messaging,
     Myc.Signals;
 
 type
-    TMsgProc = reference to procedure(const Sender: TObject; const M: TMessage);
-
-    TComponentValidation = class(TComponent)
-    private
-        FReceived: TFlag;
-        FProc: TMsgProc;
-        FSubscription: TMessageSubscriptionId;
-        FMsgClass: TClass;
-        procedure DoMsg(const Sender: TObject; const M: TMessage);
+    TSignalComponentHelper = class helper for TComponent
+        type
+            TMsgProc = reference to procedure(out IsDone: Boolean);
 
+            TSignalSubscription = class(TComponent, TSignal.ISubscriber)
+            private
+                FSignal: TSignal;
+                FSigSubscr: TSignal.TSubscription;
+                FProc: TMsgProc;
+                FNotified: Integer;
+                FIdleSubscrId: TMessageSubscriptionId;
+                class var
+                    FQueued: Integer;
+                    FCount: Integer;
+                    FItems: TList<TSignalSubscription>;
+                    FIdx: Integer;
+                class procedure HandleSignals(Timeout: Int64);
+                function Notify: Boolean;
+            public
+                constructor Create(AOwner: TComponent; const ASignal: TSignal; const AProc: TMsgProc); reintroduce;
+                destructor Destroy; override;
+            end;
     public
-        constructor Create(AOwner: TComponent; const AMsgClass: TClass; const ASignal: TSignal; const AProc: TMsgProc); reintroduce;
-        destructor Destroy; override;
-    end;
-
-    TComponentValidationHelper = class helper for TComponent
-        procedure AddMsgHandler(const MsgClass: TClass; const Signal: TSignal; const Proc: TMsgProc);
-        procedure AddIdleHandler(const Signal: TSignal; const Proc: TProc);
+        procedure ProcessSignal(const Signal: TSignal; const Proc: TMsgProc); overload;
+        procedure ProcessSignal(const Signal: TSignal; const Proc: TProc); overload;
     end;
 
 implementation
 
 uses
-{$IFDEF FRAMEWORK_FMX}
-    FMX.Types
-{$ELSE}
-    VCL.Types // to be checked
-{$IFEND}
-        ;
+    FMX.Types;
 
-{ TComponentValidation }
+{ TSignalComponentHelper.TSignalSubscription }
 
-constructor TComponentValidation.Create(AOwner: TComponent; const AMsgClass: TClass; const ASignal: TSignal; const AProc: TMsgProc);
+constructor TSignalComponentHelper.TSignalSubscription.Create(AOwner: TComponent; const ASignal: TSignal; const AProc: TMsgProc);
 begin
     inherited Create(AOwner);
-    FMsgClass := AMsgClass;
+    FSignal := ASignal;
     FProc := AProc;
-    FReceived := TFlag.CreateObserver(ASignal);
-    FSubscription := TMessageManager.DefaultManager.SubscribeToMessage(FMsgClass, DoMsg);
+    FIdx := 0;
+
+    if FItems = nil then
+    begin
+        FItems := TList<TSignalSubscription>.Create;
+        FIdleSubscrId :=
+            TMessageManager
+                .DefaultManager
+                .SubscribeToMessage(TIdleMessage, procedure(const Sender: TObject; const M: TMessage) begin HandleSignals(50); end);
+    end;
+    FItems.Add(Self);
+
+    FSigSubscr := FSignal.Subscribe(Self);
 end;
 
-destructor TComponentValidation.Destroy;
+destructor TSignalComponentHelper.TSignalSubscription.Destroy;
 begin
-    TMessageManager.DefaultManager.Unsubscribe(FMsgClass, FSubscription);
+    FSigSubscr.Unsubscribe;
+
+    FItems.Remove(Self);
+    if FItems.Count = 0 then
+    begin
+        TMessageManager.DefaultManager.Unsubscribe(TIdleMessage, FIdleSubscrId);
+        FreeAndNil(FItems);
+    end;
+
     inherited;
 end;
 
-procedure TComponentValidation.DoMsg(const Sender: TObject; const M: TMessage);
+class procedure TSignalComponentHelper.TSignalSubscription.HandleSignals(Timeout: Int64);
 begin
-    if FReceived.Reset then
-        FProc(Sender, M);
+    if AtomicExchange(FQueued, 0) = 0 then
+        exit;
+
+    var Stopwatch := TStopwatch.StartNew;
+
+    if (FIdx = 0) or (FIdx > FItems.Count) then
+        FIdx := FItems.Count;
+
+    while FIdx > 0 do
+    begin
+        dec(FIdx);
+        var sub := FItems[FIdx];
+
+        if AtomicExchange(sub.FNotified, 0) = 1 then
+        begin
+            var done := false;
+            try
+                sub.FProc(done);
+            finally
+                if done then
+                    sub.Free;
+            end;
+
+            if AtomicDecrement(FCount) = 1 then
+                break;
+        end;
+
+        if Stopwatch.ElapsedMilliseconds > Timeout then
+        begin
+            AtomicExchange(FQueued, 1);
+            break;
+        end;
+
+        if FIdx = 0 then
+            FIdx := FItems.Count;
+    end;
 end;
 
-procedure TComponentValidationHelper.AddIdleHandler(const Signal: TSignal; const Proc: TProc);
+function TSignalComponentHelper.TSignalSubscription.Notify: Boolean;
 begin
-    var capProc := Proc;
-    AddMsgHandler(TIdleMessage, Signal, procedure(const Sender: TObject; const M: TMessage) begin capProc(); end);
+    if AtomicExchange(FNotified, 1) = 0 then
+        AtomicIncrement(FCount);
+    AtomicExchange(FQueued, 1);
+
+    //    if AtomicExchange(FQueued, 1) = 0 then
+    //        TThread.Queue( nil,
+    //            procedure
+    //            begin
+    //                if AtomicExchange(FQueued, 0) = 1 then
+    //                    HandleSignals( 40 );
+    //            end);
+    Result := true;
 end;
 
-procedure TComponentValidationHelper.AddMsgHandler(const MsgClass: TClass; const Signal: TSignal; const Proc: TMsgProc);
+procedure TSignalComponentHelper.ProcessSignal(const Signal: TSignal; const Proc: TProc);
 begin
-    TComponentValidation.Create(Self, MsgClass, Signal, Proc);
+    var cProc: TProc := Proc;
+    TSignalSubscription.Create(Self, Signal, procedure(out IsDone: Boolean) begin cProc(); end);
+end;
+
+procedure TSignalComponentHelper.ProcessSignal(const Signal: TSignal; const Proc: TMsgProc);
+begin
+    TSignalSubscription.Create(Self, Signal, Proc);
 end;
 
 end.

Src/Myc.Trade.DataProvider.pas

@@ -18,7 +18,6 @@ type
         FLookback: Int64;
         function GetChanged: TSignal;
         function GetValue: TDataSeries<T>;
-        function GetWriter: TMutable<TDataSeries<T>>.IWriter;
     public
         constructor Create(ALookback, AMaxChunkSize: Int64; const AStream: IDataStream<T>);
         destructor Destroy; override;
@@ -63,11 +62,6 @@ begin
     Result := FDataSeries;
 end;
 
-function TDataStreamProvider<T>.GetWriter: TMutable<TDataSeries<T>>.IWriter;
-begin
-    Result := nil;
-end;
-
 { TDataStreamProvider }
 
 class function TDataStreamProvider.Create<T>(Lookback, MaxChunkSize: Int64; const Stream: IDataStream<T>): TMutable<TDataSeries<T>>;