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https://issues.apache.org/jira/browse/LOG4NET-108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16436315#comment-16436315
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Michael Schall commented on LOG4NET-108:
----------------------------------------
I realize this is an old ticket. However we needed something like this to
trigger the evaluator on a Level or a custom property. I implemented Nicko
Cadell's idea of a collection of evaluators.
Below is our implementation of a MultipleEvaluator. It has a list of
evaluators and can be in Any or All mode.
*MultipleEvaluator.cs*
{code:java}
public class MultipleEvaluator : ITriggeringEventEvaluator {
public enum MultipleEvaluatorMode {
Any,
All
}
private readonly List<ITriggeringEventEvaluator> _evaluators = new
List<ITriggeringEventEvaluator>();
public MultipleEvaluatorMode Mode { get; set; } =
MultipleEvaluatorMode.Any;
public void AddEvaluator(ITriggeringEventEvaluator evaluator) {
_evaluators.Add(evaluator);
}
public bool IsTriggeringEvent(LoggingEvent loggingEvent) {
switch (Mode) {
case MultipleEvaluatorMode.Any:
return _evaluators.Any(e =>
e.IsTriggeringEvent(loggingEvent));
case MultipleEvaluatorMode.All:
return _evaluators.All(e =>
e.IsTriggeringEvent(loggingEvent));
default:
throw new Exception("unknown mode: " + Mode);
}
}
}
{code}
We also created the following where you can specify a name/value of a property
that will trigger a flush (if value is not set it will trigger if the name is
present).
*PropertyValueEvaluator.cs*
{code:java}
public class PropertyValueEvaluator : ITriggeringEventEvaluator {
public string Name { get; set; }
public object Value { get; set; }
public bool IsTriggeringEvent(LoggingEvent loggingEvent) {
if (Value == null) {
return loggingEvent.Properties.Contains(Name);
}
return Equals(loggingEvent.Properties[Name], Value);
}
}
{code}
This can then be configured with the following xml (assuming the two new
Evaluators are in the log4net.Core namespace)
{code:xml}
<evaluator type="log4net.Core.MultipleEvaluator">
<evaluator type="log4net.Core.LevelEvaluator">
<threshold value="WARN"/>
</evaluator>
<evaluator type="log4net.Core.PropertyValueEvaluator">
<name value="TriggerToServer"/>
</evaluator>
</evaluator>
{code}
> [PATCH] add support for multiple evaluators in BufferingAppenderSkeletan
> ------------------------------------------------------------------------
>
> Key: LOG4NET-108
> URL: https://issues.apache.org/jira/browse/LOG4NET-108
> Project: Log4net
> Issue Type: Improvement
> Components: Appenders, Core
> Affects Versions: 1.2.10
> Reporter: Drew Schaeffer
> Assignee: Nicko Cadell
> Priority: Minor
> Fix For: 1.2/2.0 Maintenance Release
>
> Attachments: EvaluatorCollection.cs, patch-file.diff
>
>
> Currently BufferedAppenders only have support for one evaluator and one lossy
> evaluator. This is fine when the only available evaluator is LevelEvaluator
> (as multriple LevelEvaluators do not make sense) but with the addition of
> ExceptionEvaluator (LOG4NET-107) it would be nice for
> BufferingAppenderSkeletan to have a collection of evaluators.
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