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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace Implab.Diagnostics {
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public abstract class ListenerBase : ServiceLocator, ILogWriter<object>, ILogWriter<TraceEvent> {
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readonly Dictionary<object, Action> m_subscriptions = new Dictionary<object, Action>();
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protected ListenerBase() {
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Register(this);
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}
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public void Subscribe(Type eventType) {
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if (eventType == null)
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throw new ArgumentNullException("eventType");
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GetType().GetMethod("Subscribe", new Type[0]).MakeGenericMethod(eventType).Invoke(this, null);
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}
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public void Subscribe<TEvent>() {
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Subscribe<TEvent>(LogChannel<TEvent>.Default);
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}
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public void Subscribe<TEvent>(LogChannel<TEvent> channel) {
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if (channel == null)
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throw new ArgumentNullException("channel");
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lock (m_subscriptions) {
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AssertNotDisposed();
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if (m_subscriptions.ContainsKey(channel))
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return;
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var writer = GetService<ILogWriter<TEvent>>();
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EventHandler<LogEventArgs<TEvent>> handler = (sender, args) => writer.Write(args,args.Value);
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channel.Events += handler;
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Action unsubscribe = () => {
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channel.Events -= handler;
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};
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m_subscriptions.Add(channel, unsubscribe);
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}
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}
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public void Unsubscribe<TEvent>(LogChannel<TEvent> channel) {
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if (channel == null)
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throw new ArgumentNullException("channel");
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lock (m_subscriptions) {
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Action subscription;
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if (m_subscriptions.TryGetValue(channel, out subscription)) {
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subscription();
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m_subscriptions.Remove(channel);
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}
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}
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}
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public void UnsubscribeAll() {
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lock (m_subscriptions) {
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foreach (var subscription in m_subscriptions.Values)
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subscription();
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m_subscriptions.Clear();
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}
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}
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#region ILogWriter implementation
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public abstract void Write(LogEventArgs args, object entry);
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#endregion
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#region ILogWriter implementation
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public virtual void Write(LogEventArgs args, TraceEvent entry) {
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Write(args, (object)entry);
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}
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#endregion
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protected override void Dispose(bool disposing) {
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base.Dispose(disposing);
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if (disposing) {
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UnsubscribeAll();
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}
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}
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}
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}
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