mirror of
https://github.com/danieleteti/delphimvcframework.git
synced 2024-11-15 15:55:54 +01:00
113 lines
2.9 KiB
ObjectPascal
113 lines
2.9 KiB
ObjectPascal
// ***************************************************************************
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//
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// Delphi MVC Framework
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//
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// Copyright (c) 2010-2022 Daniele Teti and the DMVCFramework Team
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//
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// https://github.com/danieleteti/delphimvcframework
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//
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// ***************************************************************************
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// *************************************************************************** }
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unit MVCFramework.AsyncTask;
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interface
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uses
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System.SysUtils,
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System.Threading;
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type
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TMVCAsyncBackgroundTask<T> = reference to function: T;
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TMVCAsyncSuccessCallback<T> = reference to procedure(const BackgroundTaskResult: T);
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TMVCAsyncErrorCallback = reference to procedure(const Expt: Exception);
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TMVCAsyncDefaultErrorCallback = reference to procedure(const Expt: Exception;
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const ExptAddress: Pointer);
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MVCAsync = class sealed
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public
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class function Run<T>(
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Task: TMVCAsyncBackgroundTask<T>;
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Success: TMVCAsyncSuccessCallback<T>;
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Error: TMVCAsyncErrorCallback = nil): ITask;
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end;
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var
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gDefaultTaskErrorHandler: TMVCAsyncDefaultErrorCallback = nil;
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implementation
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uses
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System.Classes;
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{ Async }
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class function MVCAsync.Run<T>(
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Task: TMVCAsyncBackgroundTask<T>;
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Success: TMVCAsyncSuccessCallback<T>;
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Error: TMVCAsyncErrorCallback): ITask;
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var
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LRes: T;
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begin
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Result := TTask.Run(
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procedure
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var
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Ex: Pointer;
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ExceptionAddress: Pointer;
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begin
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Ex := nil;
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try
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LRes := Task();
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if Assigned(Success) then
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begin
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TThread.Queue(nil,
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procedure
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begin
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Success(LRes);
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end);
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end;
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except
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Ex := AcquireExceptionObject;
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ExceptionAddress := ExceptAddr;
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TThread.Queue(nil,
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procedure
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var
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LCurrException: Exception;
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begin
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LCurrException := Exception(Ex);
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try
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if Assigned(Error) then
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Error(LCurrException)
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else
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gDefaultTaskErrorHandler(LCurrException, ExceptionAddress);
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finally
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FreeAndNil(LCurrException);
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end;
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end);
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end;
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end);
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end;
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initialization
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gDefaultTaskErrorHandler :=
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procedure(const E: Exception; const ExceptionAddress: Pointer)
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begin
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ShowException(E, ExceptionAddress);
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end;
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end.
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