Fix in DataFeed

AuraTrader/AuraTrader.dproj

@@ -4,7 +4,7 @@
         <ProjectVersion>20.3</ProjectVersion>
         <FrameworkType>FMX</FrameworkType>
         <Base>True</Base>
-        <Config Condition="'$(Config)'==''">Release</Config>
+        <Config Condition="'$(Config)'==''">Debug</Config>
         <Platform Condition="'$(Platform)'==''">Win64</Platform>
         <ProjectName Condition="'$(ProjectName)'==''">AuraTrader</ProjectName>
         <TargetedPlatforms>3</TargetedPlatforms>

Src/AST/Myc.Ast.Compiler.TypeChecker.pas

@@ -775,7 +775,7 @@ begin
 
     if allScalar then
     begin
-        def := TScalarRecordRegistry.Intern(scalarDefFields);
+        def := TScalarRecord.TRegistry.Intern(scalarDefFields);
         staticType := TTypes.CreateRecord(def);
         Result := TAst.RecordLiteral(Node.Identity, fieldList, def, nil, staticType);
     end

Src/Data/Myc.Data.Scalar.JSON.pas

@@ -63,7 +63,7 @@ begin
 
             fields[i] := TScalarRecordField.Create(fieldKey, TScalar.TKind(GetEnumValue(TypeInfo(TScalar.TKind), kindStr)));
         end;
-        Result := TScalarRecordRegistry.Intern(fields);
+        Result := TScalarRecord.TRegistry.Intern(fields);
     finally
         jsonValue.Free;
     end;

Src/Myc.Trade.DataFeed.pas

@@ -53,8 +53,8 @@ type
                 function GetIsValid: Boolean;
             public
                 constructor Create(const APath, ASymbol, AExtension: String; AYear, AMonth: Integer; const ABasename: String);
-                function GetBaseFileName: string;
                 function GetFullFileName: string;
+                property BaseFileName: string read FBasename;
                 property IsValid: Boolean read GetIsValid;
                 property Extension: String read FExtension;
                 property Path: String read FPath;
@@ -84,10 +84,14 @@ type
         // Loading Logic
         function DoLoad(const FileName: string; const Gate: TLatch): TFuture<TArray<TBatch>>;
         function LoadDataFile(const DataFile: TDataFile): TFuture<TArray<TBatch>>;
-        function GetNextFile(const Curr: TDataFile): TDataFile;
 
         // Processing Logic
-        function ProcessFile(FileInfo: TDataFile; const DataFile: TFuture<TArray<TBatch>>; const Terminated: TState): TState;
+        function ProcessFile(
+            const Files: TArray<TDataFile>;
+            Index: Integer;
+            const DataFile: TFuture<TArray<TBatch>>;
+            const Terminated: TState
+        ): TState;
 
         function ProcessChunks(const Batches: TArray<TBatch>; Terminated: TState): TState;
 
@@ -97,7 +101,6 @@ type
 
         // Helpers
         function ParseFileName(const FileName: string): TDataFile;
-        function FindFirstFile(const Symbol: string): TFuture<TDataFile>;
         procedure UpdateSymbols;
 
     private
@@ -213,14 +216,9 @@ begin
     FBasename := ABasename;
 end;
 
-function TScalarRecordFeed.TDataFile.GetBaseFileName: string;
-begin
-    Result := FBasename;
-end;
-
 function TScalarRecordFeed.TDataFile.GetFullFileName: string;
 begin
-    Result := TPath.Combine(FPath, GetBaseFileName + FExtension);
+    Result := TPath.Combine(FPath, FBasename + FExtension);
 end;
 
 function TScalarRecordFeed.TDataFile.GetIsValid: Boolean;
@@ -350,51 +348,6 @@ begin
         );
 end;
 
-function TScalarRecordFeed.FindFirstFile(const Symbol: string): TFuture<TDataFile>;
-begin
-    var symName := Symbol;
-    Result :=
-        FSymbols.Chain<TDataFile>(
-            function(const Symbols: TDictionary<String, TArray<TDataFile>>): TDataFile
-            var
-                symbolFiles: TArray<TDataFile>;
-            begin
-                if Symbols.TryGetValue(symName, symbolFiles) and (Length(symbolFiles) > 0) then
-                    Result := symbolFiles[0]
-                else
-                    Result := Default(TDataFile);
-            end
-        );
-end;
-
-function TScalarRecordFeed.GetNextFile(const Curr: TDataFile): TDataFile;
-var
-    allSymbolFiles: TArray<TDataFile>;
-    foundIndex: Integer;
-begin
-    Result := Default(TDataFile);
-    if not Curr.IsValid or not FSymbols.Done.IsSet then
-        exit;
-
-    if not FSymbols.Value.TryGetValue(Curr.Symbol, allSymbolFiles) then
-        exit;
-
-    foundIndex := -1;
-    for var i := 0 to High(allSymbolFiles) do
-    begin
-        if allSymbolFiles[i].GetBaseFileName() = Curr.GetBaseFileName() then
-        begin
-            foundIndex := i;
-            break;
-        end;
-    end;
-
-    if (foundIndex <> -1) and (foundIndex < High(allSymbolFiles)) then
-    begin
-        Result := allSymbolFiles[foundIndex + 1];
-    end;
-end;
-
 function TScalarRecordFeed.ParseFileName(const FileName: string): TDataFile;
 var
     path, fileNameNoPath, baseName, ext, symbol: string;
@@ -608,32 +561,64 @@ end;
 function TScalarRecordFeed.ProcessData(const Symbol: String; const Terminated: TState): TState;
 begin
     var cTerminated := Terminated;
+    var cSymbol := Symbol;
 
+    // We fetch the list once, then iterate by index.
     Result :=
-        FindFirstFile(Symbol)
-            .Chain(
-                function(const FirstInfo: TDataFile): TState
+        FSymbols.Chain(
+            function(const AllSymbols: TDictionary<String, TArray<TDataFile>>): TState
+            var
+                files: TArray<TDataFile>;
+            begin
+                if AllSymbols.TryGetValue(cSymbol, files) and (Length(files) > 0) then
                 begin
-                    Result := ProcessFile(FirstInfo, LoadDataFile(FirstInfo), cTerminated);
-                end);
+                    // Start with Index 0
+                    Result := ProcessFile(files, 0, LoadDataFile(files[0]), cTerminated);
+                end
+                else
+                begin
+                    Result := TState.Null;
+                end;
+            end
+        );
 end;
 
-function TScalarRecordFeed.ProcessFile(FileInfo: TDataFile; const DataFile: TFuture<TArray<TBatch>>; const Terminated: TState): TState;
+function TScalarRecordFeed.ProcessFile(
+    const Files: TArray<TDataFile>;
+    Index: Integer;
+    const DataFile: TFuture<TArray<TBatch>>;
+    const Terminated: TState
+): TState;
 begin
-    if not FileInfo.IsValid or Terminated.IsSet then
+    // Check bounds and termination
+    if (Index < 0) or (Index > High(Files)) or Terminated.IsSet then
         exit(DataFile.Done);
 
-    var nextInfo := GetNextFile(FileInfo);
-    var nextFuture := LoadDataFile(nextInfo);
+    var currentInfo := Files[Index];
+    if not currentInfo.IsValid then
+        exit(DataFile.Done);
+
+    // Prefetch logic: Prepare the next file immediately (if available)
+    var nextIndex := Index + 1;
+    var nextFuture: TFuture<TArray<TBatch>>;
+
+    if nextIndex <= High(Files) then
+        nextFuture := LoadDataFile(Files[nextIndex])
+    else
+        nextFuture := TFuture<TArray<TBatch>>.Construct(TArray<TBatch>(nil)); // End of stream
 
     var cTerminated := Terminated;
+
+    // Process current data, then recurse to next index
     Result :=
         DataFile.Chain(
             function(const Batches: TArray<TBatch>): TState
             begin
                 var done := ProcessChunks(Batches, Terminated);
 
-                Result := TaskManager.RunTask(done, function: TState begin Result := ProcessFile(nextInfo, nextFuture, cTerminated); end);
+                // Recurse with Index + 1
+                Result :=
+                    TaskManager.RunTask(done, function: TState begin Result := ProcessFile(Files, nextIndex, nextFuture, cTerminated); end);
             end
         );
 end;