annotate Implab/Diagnostics/TextListenerBase.cs @ 65:653c4e04968b

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author cin
date Mon, 30 Jun 2014 13:55:22 +0400
parents d9d794b61bb9
children 4c0e5ef99986
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1 using System;
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2 using System.Collections.Generic;
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3 using System.Linq;
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4 using System.Text;
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5
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6 namespace Implab.Diagnostics {
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7 public abstract class TextListenerBase : ServiceLocator, IEventTextFormatter<object>, IEventTextFormatter<TraceEvent> {
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8
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9 readonly Dictionary<object, Action> m_subscriptions = new Dictionary<object, Action>();
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10 readonly LogicalOperation m_boundOperation;
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11 readonly int m_baseIndent;
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12
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13 protected TextListenerBase(bool global) {
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14 Register(this);
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15 if (!global) {
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16 m_boundOperation = TraceContext.Current.CurrentOperation;
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17 m_baseIndent = Math.Max(0, m_boundOperation.Level - 1);
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18 }
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19 }
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20
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21 public void Subscribe(Type eventType) {
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22 if (eventType == null)
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23 throw new ArgumentNullException("eventType");
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24 GetType().GetMethod("Subscribe", new Type[0]).MakeGenericMethod(eventType).Invoke(this, null);
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25 }
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26
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27 public void Subscribe<TEvent>() {
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28 Subscribe<TEvent>(LogChannel<TEvent>.Default);
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29 }
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30
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31 public void Subscribe<TEvent>(LogChannel<TEvent> channel) {
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32 if (channel == null)
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33 throw new ArgumentNullException("channel");
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34
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35 lock (m_subscriptions) {
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36 AssertNotDisposed();
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37
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38 var formatter = GetService<IEventTextFormatter<TEvent>>();
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39 var channelName = channel.Name;
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41 EventHandler<ValueEventArgs<TEvent>> handler = (sender, args) => {
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42 TraceContext context = (TraceContext)sender;
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43 var text = formatter.Format(context, args.Value);
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44 text.indent -= m_baseIndent;
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45
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46 if (IsRelated(context.CurrentOperation))
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47 WriteEntry(context, text, channelName);
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48 };
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49
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50 if (m_subscriptions.ContainsKey(channel))
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51 return;
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52
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53 channel.Events += handler;
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54
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55 Action unsubscribe = () => {
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56 channel.Events -= handler;
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57 };
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58
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59 m_subscriptions.Add(channel, unsubscribe);
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60 }
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61 }
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62
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63 public bool IsRelated(LogicalOperation op) {
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64 if (m_boundOperation == null)
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65 return true;
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66
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67 while (op != m_boundOperation && op.Level > m_boundOperation.Level)
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68 op = op.Parent;
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69 return op == m_boundOperation;
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70 }
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71
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72 public void Unsubscribe<TEvent>(LogChannel<TEvent> channel) {
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73 if (channel == null)
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74 throw new ArgumentNullException("channel");
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75
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76 lock (m_subscriptions) {
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77 Action subscription;
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78 if (m_subscriptions.TryGetValue(channel, out subscription)) {
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79 subscription();
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80 m_subscriptions.Remove(channel);
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81 }
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82 }
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83 }
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84
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85 public void UnsubscribeAll() {
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86 lock (m_subscriptions) {
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87 foreach (var subscription in m_subscriptions.Values)
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88 subscription();
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89 m_subscriptions.Clear();
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90 }
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91 }
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92
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93 /// <summary>
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94 /// Вызывается для записи текста сообщения, в журнал.
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95 /// </summary>
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96 /// <remarks>
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97 /// Данный метод может вызваться из разных потоков одновременно. Возможна ситуация, когда
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98 /// данный метод вызывается уже после освобождения ообъекта методом <see cref="Dispose()"/>.
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99 /// </remarks>
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100 /// <param name="context">Контекст трассировки.</param>
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101 /// <param name="text">Текст сообщения.</param>
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102 protected abstract void WriteEntry(TraceContext context, EventText text, string channel);
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103
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104 public EventText Format(TraceContext context, object data) {
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105 return new EventText {
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106 indent = context.CurrentOperation.Level,
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107 content = data.ToString()
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108 };
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109 }
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110
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111 public EventText Format(TraceContext context, TraceEvent data) {
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112 var level = context.CurrentOperation.Level;
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113 if (data.EventType == TraceEventType.OperationCompleted || data.EventType == TraceEventType.OperationStarted)
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114 level--;
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115
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116 return new EventText {
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117 indent = level,
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118 content = data.ToString()
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119 };
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120 }
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121
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122 protected override void Dispose(bool disposing) {
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123 base.Dispose(disposing);
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124 if (disposing) {
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125 UnsubscribeAll();
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126 }
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127 }
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128 }
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129 }