Michael Schimmel
77 lines
2.0 KiB
ObjectPascal
77 lines
2.0 KiB
ObjectPascal
unit Myc.Futures;
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interface
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uses
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System.SysUtils,
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Myc.Signals, Myc.TaskManager;
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type
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// Represents the eventual result of an asynchronous operation.
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IMycFuture<T> = interface
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{$REGION 'property access'}
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function GetResult: T;
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function GetDone: IMycState;
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{$ENDREGION}
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// Provides access to the computed result.
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property Result: T read GetResult;
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// Provides access to the completion state.
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property Done: IMycState read GetDone;
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end;
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Future<T> = record
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strict private
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FFuture: IMycFuture<T>;
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class constructor CreateClass;
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class destructor DestroyClass;
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constructor Create(const AFuture: IMycFuture<T>);
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public
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class function Construct(const Proc: TFunc<T>): Future<T>; overload; static;
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class function Construct(const Gate: IMycState; const Proc: TFunc<T>): Future<T>; overload; static;
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function Chain<S>(const Proc: TFunc<T, S>): Future<S>;
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end;
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implementation
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uses
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Myc.Core.Futures, Myc.Core.Tasks;
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constructor Future<T>.Create(const AFuture: IMycFuture<T>);
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begin
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FFuture := AFuture;
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end;
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class constructor Future<T>.CreateClass;
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begin
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TMycTaskFactory.AquireTaskManager;
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end;
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class destructor Future<T>.DestroyClass;
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begin
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TMycTaskFactory.ReleaseTaskManager;
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end;
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function Future<T>.Chain<S>(const Proc: TFunc<T, S>): Future<S>;
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begin
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var Cap := FFuture;
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Result := Future<S>.Construct( FFuture.Done,
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function: S
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begin
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Result := Proc( Cap.Result );
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end );
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end;
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class function Future<T>.Construct(const Proc: TFunc<T>): Future<T>;
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begin
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Result.Create( TMycInitStateFuncFuture<T>.Create( TaskManager, nil, Proc ) );
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end;
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class function Future<T>.Construct(const Gate: IMycState; const Proc: TFunc<T>): Future<T>;
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begin
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Result.Create( TMycInitStateFuncFuture<T>.Create( TaskManager, Gate, Proc ) );
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end;
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end.
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