148 lines
4.1 KiB
VB.net
148 lines
4.1 KiB
VB.net
#Region "Microsoft.VisualBasic::ace065b1c8fa32d27a4802a089772660, Microsoft.VisualBasic.Core\ApplicationServices\Parallel\Tasks\Task.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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' Class Task
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'
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' Properties: Value
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'
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' Constructor: (+1 Overloads) Sub New
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'
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' Function: GetValue, Start
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'
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' Sub: __invokeTask
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'
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' Class Task
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'
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' Constructor: (+1 Overloads) Sub New
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'
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' Function: Start
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'
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' Sub: __invokeTask, RaisingEvent
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'
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' Class Task
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'
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' Constructor: (+1 Overloads) Sub New
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'
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' Function: Start
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'
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' Sub: __invokeTask, RaisingEvent
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'
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'
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' /********************************************************************************/
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#End Region
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Namespace Parallel.Tasks
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''' <summary>
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''' 更加底层的线程模式，和LINQ相比不会受到CPU核心数目的限制
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''' </summary>
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''' <typeparam name="T">后台任务的执行参数</typeparam>
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''' <typeparam name="TOut">后台任务的执行结果</typeparam>
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Public Class Task(Of T, TOut) : Inherits IParallelTask
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Dim _Handle As Func(Of T, TOut)
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Dim _Input As T
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''' <summary>
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''' 假若任务已经完成，则会返回计算值，假若没有完成，则只会返回空值，
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''' 假若想要在任何情况之下都会得到后台任务所执行的计算结果，
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''' 请使用<see cref="GetValue()"/>方法
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''' </summary>
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''' <returns></returns>
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Public ReadOnly Property Value As TOut
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''' <summary>
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''' 假若后台任务还没有完成，则函数会一直阻塞在这里直到任务执行完毕，
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''' 假若任务早已完成，则函数会立即返回数据
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''' </summary>
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''' <returns></returns>
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Public Function GetValue() As TOut
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If Not Me.TaskRunning Then
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Call Start()
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End If
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Call WaitForExit()
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Return Value
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End Function
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Sub New(Input As T, Handle As Func(Of T, TOut))
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_Handle = Handle
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_Input = Input
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End Sub
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Public Function Start() As Task(Of T, TOut)
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TaskComplete = False
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_RunningTask = True
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Call RunTask(AddressOf doInvokeTask)
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Return Me
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End Function
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Protected Overrides Sub doInvokeTask()
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TaskComplete = False
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_RunningTask = True
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_Value = _Handle(_Input)
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TaskComplete = True
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_RunningTask = False
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End Sub
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End Class
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Public Class Task(Of T) : Inherits IParallelTask
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Dim inputVal As T
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Dim handleTask As Action(Of T)
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Public Event TaskJobComplete()
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Sub New(Input As T, Handle As Action(Of T))
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inputVal = Input
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handleTask = Handle
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End Sub
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Public Function Start() As Task(Of T)
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Call RunTask(AddressOf doInvokeTask)
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Return Me
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End Function
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Protected Overrides Sub doInvokeTask()
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TaskComplete = False
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_RunningTask = True
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Call handleTask(inputVal)
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TaskComplete = True
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_RunningTask = False
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RaiseEvent TaskJobComplete()
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End Sub
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End Class
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End Namespace
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