private void ConsumeDeferredEnable(string eventSourceName, Action <DeferredEnable> action)
{
DeferredEnable previousEnable = null;
for (var currentDeferredEnable = this.deferredEnables; currentDeferredEnable != null; currentDeferredEnable = currentDeferredEnable.Next)
{
if (string.Equals(currentDeferredEnable.EventSourceName, eventSourceName, StringComparison.Ordinal))
{
// consume the deferred enable
action(currentDeferredEnable);
// remove the entry
if (previousEnable == null)
{
this.deferredEnables = currentDeferredEnable.Next;
}
else
{
previousEnable.Next = currentDeferredEnable.Next;
}
return;
}
previousEnable = currentDeferredEnable;
}
}
/// <summary>
/// Enables events for the specified event source that has the specified verbosity level or lower, and matching keyword flags.
/// </summary>
/// <param name="eventSourceName">The name of the event source to enable events for.</param>
/// <param name="level">The level of events to enable.</param>
/// <param name="matchAnyKeyword">The keyword flags necessary to enable the events.</param>
/// <param name="arguments">The arguments to be matched to enable the events.</param>
/// <returns>
/// <see langword="false" /> if the request was deferred; otherwise, <see langword="true" />.
/// </returns>
/// <remarks>
/// If the event source with the supplied name has already been created the request is processed immediately. Otherwise the request
/// is deferred until the event source is created.
/// </remarks>
public bool EnableEvents(string eventSourceName, EventLevel level, EventKeywords matchAnyKeyword, IDictionary <string, string> arguments)
{
Guard.ArgumentNotNullOrEmpty(eventSourceName, "eventSourceName");
lock (this.deferredEnablePadlock)
{
foreach (var eventSource in EventSource.GetSources())
{
if (string.Equals(eventSource.Name, eventSourceName, StringComparison.Ordinal))
{
this.EnableEvents(eventSource, level, matchAnyKeyword, arguments);
return(true);
}
}
// remove any previous deferred enable for the same source name and add a new one
this.ConsumeDeferredEnable(eventSourceName, _ => { });
this.deferredEnables =
new DeferredEnable
{
EventSourceName = eventSourceName,
Level = level,
MatchAnyKeyword = matchAnyKeyword,
Arguments = arguments != null ? new Dictionary <string, string>(arguments) : null,
Next = this.deferredEnables
};
return(false);
}
}
