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annotate Implab.Diagnostics.Interactive/InteractiveListener.cs @ 242:cbe10ac0731e v3

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Working on promises
author cin
date Wed, 24 Jan 2018 03:03:21 +0300
parents eedf4d834e67
children
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1 using Implab.Parallels;
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2 using System;
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3 using System.Collections.Generic;
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4 using System.Linq;
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5 using System.Text;
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6 using System.Threading;
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7 using System.Threading.Tasks;
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8 using System.Windows.Forms;
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9
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10 namespace Implab.Diagnostics.Interactive
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11 {
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12 public class InteractiveListener: ListenerBase
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13 {
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14 TraceForm m_form;
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15
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16 SynchronizationContext m_syncGuiThread;
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17 readonly Promise m_guiStarted = new Promise();
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18
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19 readonly IPromise m_guiFinished;
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20
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21 readonly SimpleAsyncQueue<TraceViewItem> m_queue = new SimpleAsyncQueue<TraceViewItem>();
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22 readonly AutoResetEvent m_queueEvent = new AutoResetEvent(false);
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23
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24 int m_queueLength;
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25 bool m_exitPending;
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26
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27 readonly object m_pauseLock = new object();
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28 bool m_paused;
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29 readonly ManualResetEvent m_pauseEvent = new ManualResetEvent(true);
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30
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31 public InteractiveListener() {
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32 m_guiFinished = RunGuiThread();
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33 AsyncPool.RunThread(QueueThread);
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34
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35 m_guiStarted.Join();
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36 }
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37
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38 void GuiThread() {
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39 m_form = new TraceForm(); // will create SynchronizationContext
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40
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41 m_form.PauseEvents += (s,a) => Pause();
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42 m_form.ResumeEvents += (s, a) => Resume();
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43
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44 m_syncGuiThread = SynchronizationContext.Current;
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45 m_guiStarted.Resolve();
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46 Application.Run();
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47 }
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48
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49 void QueueThread() {
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50 while (!m_exitPending) {
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51 if (m_paused)
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52 m_pauseEvent.WaitOne();
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53
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54 TraceViewItem item;
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55 if (m_queue.TryDequeue(out item)) {
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56 Interlocked.Decrement(ref m_queueLength);
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57
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58 m_syncGuiThread.Post(x => m_form.AddTraceEvent(item),null);
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59 } else {
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60 m_queueEvent.WaitOne();
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61 }
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62 }
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63 }
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64
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65 public IPromise RunGuiThread() {
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66 var p = new Promise();
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67
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68 var caller = TraceContext.Instance.CurrentOperation;
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69
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70 var worker = new Thread(() => {
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71 TraceContext.Instance.EnterLogicalOperation(caller, false);
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72 try {
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73 Application.OleRequired();
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74 GuiThread();
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75 p.Resolve();
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76 } catch (Exception e) {
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77 p.Reject(e);
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78 } finally {
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79 TraceContext.Instance.Leave();
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80 }
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81 });
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82 worker.SetApartmentState(ApartmentState.STA);
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83 worker.IsBackground = true;
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84 worker.Name = string.Format("{0} GUI Thread", nameof(InteractiveListener));
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85 worker.Start();
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86
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87 return p;
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88 }
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89
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90 public void Pause() {
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91 // for consistency we need to set this properties atomically
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92 lock (m_pauseLock) {
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93 m_pauseEvent.Reset();
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94 m_paused = true;
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95 }
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96 }
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97
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98 public void Resume() {
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99 // for consistency we need to set this properties atomically
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100 lock (m_pauseLock) {
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101 m_paused = false;
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102 m_pauseEvent.Set();
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103 }
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104 }
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105
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106 void Enqueue(TraceViewItem item) {
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107 m_queue.Enqueue(item);
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108 if (Interlocked.Increment(ref m_queueLength) == 1)
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109 m_queueEvent.Set();
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110 }
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111
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112 public void ShowForm() {
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113 m_syncGuiThread.Post(x => m_form.Show(), null);
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114 }
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115
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116 public void HideForm() {
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117 m_syncGuiThread.Post(x => m_form.Hide(), null);
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118 }
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119
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120 void Terminate() {
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121 m_exitPending = true;
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122 Resume();
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123 m_syncGuiThread.Post(x => Application.ExitThread(), null);
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124 }
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125
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126 protected override void Dispose(bool disposing) {
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127 if (disposing) {
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128 Terminate();
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129 m_guiFinished.Join();
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130 }
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131 base.Dispose(disposing);
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132 }
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133
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134 public override void Write(LogEventArgs args, object entry) {
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135 var item = new TraceViewItem {
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136 Indent = args.Operation.Level,
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137 Message = entry.ToString(),
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138 Thread = args.ThreadId,
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139 Channel = args.Channel.ToString(),
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140 Timestamp = Environment.TickCount,
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141 TimeDelta = args.OperationTimeOffset
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142 };
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143
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144 Enqueue(item);
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145 }
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146 }
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147 }