[logback-user] How to log FROM an appender?

[Steve Cohen]

Yes, as I indicated, it's a marginal use case.
But
1) logging exceptions in the JMS transmission itself
2) Since the formatting of the message for the legacy logging system is 
happening in the JMS appender (arguably a suboptimal design) there is a 
use case for trace logging for development purposes to log the output of 
the formatting operation.  In production, this would certainly be turned 
off.


On 11/15/2011 10:32 AM, TJ Rothwell wrote:
> I must be missing something. Why the need to originate new logging messages
> from the appender? Any status updates you could do through ContextAware
> methods; any custom work to the JMS Queue would occur in that appender. So
> I don't understand the need for creating additional logging messages. If
> the appender is acting as a filter so some messages can be processed by a
> different appender, then a filter would help. [1]
>
> I'm glad you have something that works.
>
> [1] http://logback.qos.ch/manual/filters.html
>
> -- TJ
>
> On Tue, Nov 15, 2011 at 7:39 AM, Steve Cohen<scohen at javactivity.org>  wrote:
>
>> It's a JMSQueue-based appender.  It was written for log4j (only recently
>> have we switched to logback) which didn't have one.  In addition to the JMS
>> functionality, at the other end of the JMS socket sits a server application
>> written in C with its own legacy logging system that must be catered to.
>>   This involves some special formatting and data which is neither necessary
>> nor desirable for inclusion in the local logging that the client-side
>> application also needs.  The appender is perhaps the most convenient place
>> to do this.
>>
>> However, I do suppose that I should look at the layout and custom format
>> specifier supported by logback as a possibly better way to accomplish the
>> same thing.  But what I have seems to work.
>>
>>
>> On 11/14/2011 09:37 PM, TJ Rothwell wrote:
>>
>>> I'm curious: what use-case is fulfilled by the additional messages
>>> generated by the appender?
>>>
>>> -- TJ
>>>
>>> On Mon, Nov 14, 2011 at 4:00 PM, Steve Cohen<scohen at javactivity.org>
>>>   wrote:
>>>
>>>   On 11/12/2011 04:14 PM, Steve Cohen wrote:
>>>>
>>>>   We have a custom appender that may itself need to issue logging
>>>>> statements. But placing a logger in such a class causes various
>>>>> exceptions on initialization and loading. So we are resorting to
>>>>> System.out.println for lack of a better solution.
>>>>>
>>>>> I suppose there must be a better way.
>>>>> What would that be?
>>>>>
>>>>>
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>>>>>>
>>>>>
>>>>>
>>>>>
>>>>>   A technique that seems to work is to NOT declare a logger in the
>>>>>
>>>> Appender class that you want to use one from, but instead create a static
>>>> logger instance somewhere that is accessible through static methods.
>>>>   That
>>>> way the logger does not need to be created at the time of appender
>>>> instantiation.
>>>>
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>>>>>
>>>>
>>>>
>>>
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