129 lines
3.8 KiB
VB.net
129 lines
3.8 KiB
VB.net
#Region "Microsoft.VisualBasic::c175892d49f300190df0613b99089f2c, Microsoft.VisualBasic.Core\ApplicationServices\Parallel\Tasks\__backgroundTask(Of T).vb"
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' Author:
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'
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' asuka (amethyst.asuka@gcmodeller.org)
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' xie (genetics@smrucc.org)
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' xieguigang (xie.guigang@live.com)
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'
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' Copyright (c) 2018 GPL3 Licensed
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'
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'
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' GNU GENERAL PUBLIC LICENSE (GPL3)
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'
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'
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' This program is free software: you can redistribute it and/or modify
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' it under the terms of the GNU General Public License as published by
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' the Free Software Foundation, either version 3 of the License, or
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' (at your option) any later version.
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'
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' This program is distributed in the hope that it will be useful,
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' but WITHOUT ANY WARRANTY; without even the implied warranty of
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' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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' GNU General Public License for more details.
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'
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' You should have received a copy of the GNU General Public License
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' along with this program. If not, see <http://www.gnu.org/licenses/>.
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' /********************************************************************************/
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' Summaries:
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' Delegate Function
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'
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'
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' Class __backgroundTask
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'
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' Properties: ExecuteException, TaskHandle, Value
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'
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' Constructor: (+1 Overloads) Sub New
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'
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' Function: Start, ToString
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'
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' Sub: __invokeTask, Abort
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'
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'
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'
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' /********************************************************************************/
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#End Region
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Imports System.Reflection
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Namespace Parallel.Tasks
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''' <summary>
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''' 背景线程的任务抽象
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''' </summary>
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''' <typeparam name="T"></typeparam>
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''' <returns></returns>
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Public Delegate Function IBackgroundTask(Of T)() As T
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Friend Class __backgroundTask(Of T) : Inherits IParallelTask
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''' <summary>
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''' 获取得到任务线程执行的输出结果
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''' </summary>
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''' <returns></returns>
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Public ReadOnly Property Value As T
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Get
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If Not TaskComplete Then
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Call Start()
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Call WaitForExit()
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End If
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Return __getValue
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End Get
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End Property
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Public ReadOnly Property TaskHandle As IBackgroundTask(Of T)
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ReadOnly _taskThread As Threading.Thread
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Dim __getValue As T
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Public ReadOnly Property ExecuteException As Exception
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Public Overrides Function ToString() As String
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Return TaskHandle.ToString
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End Function
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Sub New(task As IBackgroundTask(Of T))
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_TaskHandle = task
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_taskThread = New Threading.Thread(AddressOf __invokeTask)
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End Sub
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''' <summary>
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''' 取消当前的任务的执行，在线程内部产生的异常可以在<see cref="ExecuteException"/>获取得到
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''' </summary>
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Public Sub Abort()
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Call _taskThread.Abort()
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_TaskComplete = False
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_RunningTask = False
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End Sub
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Public Function Start() As __backgroundTask(Of T)
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If Not TaskRunning Then
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_taskThread.Start()
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_TaskComplete = False
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End If
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Return Me
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End Function
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Protected Overrides Sub __invokeTask()
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Me._RunningTask = True
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Me._TaskComplete = False
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Try
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__getValue = _TaskHandle()
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Catch ex As Exception
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_ExecuteException =
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New Exception(MethodBase.GetCurrentMethod.GetFullName, ex)
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End Try
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Me._RunningTask = False
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Me._TaskComplete = True
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End Sub
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End Class
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End Namespace
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