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134
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1 using System;
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2 using System.Collections.Generic;
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152
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3 using Implab.Components;
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134
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4
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5 namespace Implab.Diagnostics {
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6 public abstract class ListenerBase : ServiceLocator, ILogWriter<object>, ILogWriter<TraceEvent> {
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7
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8 readonly Dictionary<object, Action> m_subscriptions = new Dictionary<object, Action>();
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9
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10 protected ListenerBase() {
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11 Register(this);
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12 }
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13
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14 public void Subscribe(Type eventType) {
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15 if (eventType == null)
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16 throw new ArgumentNullException("eventType");
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17 GetType().GetMethod("Subscribe", new Type[0]).MakeGenericMethod(eventType).Invoke(this, null);
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18 }
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19
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20 public void Subscribe<TEvent>() {
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21 Subscribe<TEvent>(LogChannel<TEvent>.Default);
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22 }
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23
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24 public void Subscribe<TEvent>(LogChannel<TEvent> channel) {
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25 if (channel == null)
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26 throw new ArgumentNullException("channel");
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27
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28 lock (m_subscriptions) {
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29 AssertNotDisposed();
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30 if (m_subscriptions.ContainsKey(channel))
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31 return;
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32
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33 var writer = GetService<ILogWriter<TEvent>>();
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34
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35 EventHandler<LogEventArgs<TEvent>> handler = (sender, args) => writer.Write(args,args.Value);
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36
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37 channel.Events += handler;
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38
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39 Action unsubscribe = () => {
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40 channel.Events -= handler;
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41 };
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42
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43 m_subscriptions.Add(channel, unsubscribe);
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44 }
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45 }
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46
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47 public void Unsubscribe<TEvent>(LogChannel<TEvent> channel) {
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48 if (channel == null)
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49 throw new ArgumentNullException("channel");
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50
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51 lock (m_subscriptions) {
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52 Action subscription;
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53 if (m_subscriptions.TryGetValue(channel, out subscription)) {
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54 subscription();
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55 m_subscriptions.Remove(channel);
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56 }
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57 }
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58 }
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59
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60 public void UnsubscribeAll() {
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61 lock (m_subscriptions) {
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62 foreach (var subscription in m_subscriptions.Values)
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63 subscription();
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64 m_subscriptions.Clear();
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65 }
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66 }
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67
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68 #region ILogWriter implementation
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69 public abstract void Write(LogEventArgs args, object entry);
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70 #endregion
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71
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72 #region ILogWriter implementation
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73 public virtual void Write(LogEventArgs args, TraceEvent entry) {
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74 Write(args, (object)entry);
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75 }
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76 #endregion
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77
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78
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79 protected override void Dispose(bool disposing) {
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80 base.Dispose(disposing);
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81 if (disposing) {
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82 UnsubscribeAll();
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83 }
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84 }
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85 }
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86 }
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