1 | #Region "Microsoft.VisualBasic::49922bb572a6412da70ee516aa4d34f7, Microsoft.VisualBasic.Core\ApplicationServices\Parallel\Tasks\Task.vb" |
2 | |
3 | ' Author: |
4 | ' |
5 | ' asuka (amethyst.asuka@gcmodeller.org) |
6 | ' xie (genetics@smrucc.org) |
7 | ' xieguigang (xie.guigang@live.com) |
8 | ' |
9 | ' Copyright (c) 2018 GPL3 Licensed |
10 | ' |
11 | ' |
12 | ' GNU GENERAL PUBLIC LICENSE (GPL3) |
13 | ' |
14 | ' |
15 | ' This program is free software: you can redistribute it and/or modify |
16 | ' it under the terms of the GNU General Public License as published by |
17 | ' the Free Software Foundation, either version 3 of the License, or |
18 | ' (at your option) any later version. |
19 | ' |
20 | ' This program is distributed in the hope that it will be useful, |
21 | ' but WITHOUT ANY WARRANTY; without even the implied warranty of |
22 | ' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
23 | ' GNU General Public License for more details. |
24 | ' |
25 | ' You should have received a copy of the GNU General Public License |
26 | ' along with this program. If not, see <http://www.gnu.org/licenses/>. |
27 | |
28 | |
29 | |
30 | ' /********************************************************************************/ |
31 | |
32 | ' Summaries: |
33 | |
34 | ' Class Task |
35 | ' |
36 | ' Properties: Value |
37 | ' |
38 | ' Constructor: (+1 Overloads) Sub New |
39 | ' |
40 | ' Function: GetValue, Start |
41 | ' |
42 | ' Sub: __invokeTask |
43 | ' |
44 | ' Class Task |
45 | ' |
46 | ' Constructor: (+1 Overloads) Sub New |
47 | ' |
48 | ' Function: Start |
49 | ' |
50 | ' Sub: __invokeTask, RaisingEvent |
51 | ' |
52 | ' Class Task |
53 | ' |
54 | ' Constructor: (+1 Overloads) Sub New |
55 | ' |
56 | ' Function: Start |
57 | ' |
58 | ' Sub: __invokeTask, RaisingEvent |
59 | ' |
60 | ' |
61 | ' /********************************************************************************/ |
62 | |
63 | #End Region |
64 | |
65 | Imports System.Reflection |
66 | |
67 | Namespace Parallel.Tasks |
68 | |
69 | ''' <summary> |
70 | ''' 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 |
71 | ''' </summary> |
72 | ''' <typeparam name="T">后台任务的执行参数</typeparam> |
73 | ''' <typeparam name="TOut">后台任务的执行结果</typeparam> |
74 | Public Class Task(Of T, TOut) : Inherits IParallelTask |
75 | |
76 | Dim _Handle As Func(Of T, TOut) |
77 | Dim _Input As T |
78 | |
79 | ''' <summary> |
80 | ''' 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,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,请使用<see cref="GetValue()"/>方法 |
81 | ''' </summary> |
82 | ''' <returns></returns> |
83 | Public ReadOnly Property Value As TOut |
84 | |
85 | ''' <summary> |
86 | ''' 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,假若任务早已完成,则函数会立即返回数据 |
87 | ''' </summary> |
88 | ''' <returns></returns> |
89 | Public Function GetValue() As TOut |
90 | If Not Me.TaskRunning Then |
91 | Call Start() |
92 | End If |
93 | |
94 | Call WaitForExit() |
95 | Return _Value |
96 | End Function |
97 | |
98 | Sub New(Input As T, Handle As Func(Of T, TOut)) |
99 | _Handle = Handle |
100 | _Input = Input |
101 | End Sub |
102 | |
103 | Public Function Start() As Task(Of T, TOut) |
104 | _TaskComplete = False |
105 | _RunningTask = True |
106 | Call New Threading.Thread(AddressOf __invokeTask).Start() |
107 | Return Me |
108 | End Function |
109 | |
110 | Protected Overrides Sub __invokeTask() |
111 | |
112 | _TaskComplete = False |
113 | _RunningTask = True |
114 | _Value = _Handle(_Input) |
115 | _TaskComplete = True |
116 | _RunningTask = False |
117 | |
118 | End Sub |
119 | End Class |
120 | |
121 | ''' <summary> |
122 | ''' 这个是带有<see cref="Task.TaskJobComplete"/>事件的任务对象 |
123 | ''' </summary> |
124 | Public Class Task : Inherits IParallelTask |
125 | |
126 | ''' <summary> |
127 | ''' 当所请求的任务执行完毕之后触发 |
128 | ''' </summary> |
129 | Public Event TaskJobComplete() |
130 | |
131 | Dim _Handle As Action |
132 | |
133 | Sub New(Handle As Action) |
134 | _Handle = Handle |
135 | End Sub |
136 | |
137 | Protected Overrides Sub __invokeTask() |
138 | _TaskComplete = False |
139 | _RunningTask = True |
140 | Call _Handle() |
141 | _TaskComplete = True |
142 | _RunningTask = False |
143 | End Sub |
144 | |
145 | Public Function Start() As Task |
146 | _TaskComplete = False |
147 | _RunningTask = True |
148 | Call New Threading.Thread(AddressOf __invokeTask).Start() |
149 | Call Threading.Thread.Sleep(1) |
150 | Call New Threading.Thread(AddressOf RaisingEvent).Start() |
151 | Return Me |
152 | End Function |
153 | |
154 | Private Sub RaisingEvent() |
155 | Call WaitForExit() |
156 | RaiseEvent TaskJobComplete() |
157 | End Sub |
158 | End Class |
159 | |
160 | Public Class Task(Of T) : Inherits IParallelTask |
161 | |
162 | Dim _Input As T |
163 | Dim _Handle As Action(Of T) |
164 | |
165 | Public Event TaskJobComplete() |
166 | |
167 | Sub New(Input As T, Handle As Action(Of T)) |
168 | _Input = Input |
169 | _Handle = Handle |
170 | End Sub |
171 | |
172 | Public Function Start() As Task(Of T) |
173 | _TaskComplete = False |
174 | _RunningTask = True |
175 | Call New Threading.Thread(AddressOf __invokeTask).Start() |
176 | Call Threading.Thread.Sleep(1) |
177 | Call New Threading.Thread(AddressOf RaisingEvent).Start() |
178 | Return Me |
179 | End Function |
180 | |
181 | Private Sub RaisingEvent() |
182 | Call WaitForExit() |
183 | RaiseEvent TaskJobComplete() |
184 | End Sub |
185 | |
186 | Protected Overrides Sub __invokeTask() |
187 | _TaskComplete = False |
188 | _RunningTask = True |
189 | Call _Handle(_Input) |
190 | _TaskComplete = True |
191 | _RunningTask = False |
192 | End Sub |
193 | End Class |
194 | End Namespace |