Thanks Ron, very interesting. That interface also explains why log4net
accepts an object - I like this. I will look into your suggestions, thanks.
--
Werner
Ron Grabowski wrote:
>
> Have you looked into writing an log4net.ObjectRenderer.IObjectRenderer to
> render the message as text or is that not that possibility?
>
> Maybe this will work:
>
> // untested
> public class WouldLogAppender : ForwardingAppender
> {
> public bool WouldLog(LoggingEvent loggingEvent)
> {
> return FilterEvent(loggingEvent);
> }
> }
>
> You'd have to put your filters and thresholds on the WouldLogAppender
> instead of on the wrapped appender.
>
>
> ----- Original Message ----
> From: ITemplate <[email protected]>
> To: [email protected]
> Sent: Thu, April 15, 2010 3:36:20 AM
> Subject: Re: Possible to test log4net filters on certain logevent?
>
>
> Hi Loren,
>
> Thanks for your reply! Well there are a couple of reasons but as an
> example,
> we need to log special webservices where the request and responses are
> VERY
> large objects that log4net (or any other) can't serialize correct. We have
> our own serializer for that job. But at the same time, these web services
> must perform well and object serialization here is a rather expensive and
> time consuming task. So I would like the ability to test if the log system
> would actually log the data - and if not, I would not even begin to
> serialize the classes to text.
>
> But on the other hand I will not begin to dig too deep into log4net to
> accomplish this - it would only make sense if there were some easy way
> like:
>
> var mustSerialize = false
> foreach(var appender in log4net.Appenders)
> {
> mustSerialize = appender.WouldLog(logEvent);
> if (mustSerialize) break;
> }
>
> But digging deeper would drain the goal of saving the time to serialize I
> guess...
>
> --
> Werner
>
>
>
> Loren Keagle wrote:
>>
>> I don't think that this is possible without some dangerous coding.
>> Looking at the source code, there are no methods on any appenders to
>> test the level/filter chain in advance. Given that your log4net config
>> could contain dozens of appenders, each with their own set of filters,
>> you could not make a single call to determine if an event would be
>> filtered from all of them. Perhaps if you provided a little bit of
>> context, someone here might be able to offer an alternative approach?
>>
>> If you really must have a programmatic way of doing this, you would have
>> to gain access to all of your appenders, iterate through them, casting
>> each to AppenderSkeleton (assuming the appender derives from this helper
>> class!!!), test the log level of each, then iterate through all of the
>> filters in the FilterHead linked list property. AppenderSkeleton has a
>> protected method called FilterEvent that does all of this, but you
>> cannot access it. It would probably have solved your problem if this
>> method was part of the IAppender interface, but it's currently not
>> accessible.
>>
>> So I suppose it is possible, but you're going to end up duplicating all
>> of the logic that is already in AppenderSkeleton, which means you will
>> be executing code twice. If you have multiple appenders, you will have
>> to check each appender separately.
>>
>> ~Loren Keagle
>>
>>
>> On 4/13/2010 6:18 AM, ITemplate wrote:
>>> Noone knows? Perhaps I could rephrase: I need a programmatic way to
>>> determine
>>> if a certain logentry would be filtered or not.
>>>
>>> Example: I have the following logentry:
>>> logger.Warn("This might be logged but I dont know. I want to test it in
>>> code.");
>>>
>>> Now I want to find out - at runtime - if that specific line in my code
>>> will
>>> produce a log. Some programmatic way to test one or all configured
>>> filters
>>> against the data in my log-line (Logger, Level, text etc).
>>>
>>> Hope my meaning here is more clearer?
>>>
>>> Thanks.
>>>
>>>
>>>
>>> ITemplate wrote:
>>>
>>>> Hi,
>>>>
>>>> Is this "old" forum the only for log4net? Anyways - suppose I have a
>>>> certain logevent, is it possible to investigate up front IF that
>>>> particular logevent would pass all filters? I can't seem to find a
>>>> Filters
>>>> collection that I can use for this?
>>>>
>>>> --
>>>> Werner
>>>>
>>>>
>>>
>>>
>>>
>>>
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>>> 11:32:00
>>>
>>>
>>
>>
>>
>
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> Sent from the Log4net - Users mailing list archive at Nabble.com.
>
>
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