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From: "Jacob Kjome" <hoju@visi.com>
Subject: Re: How to create client based log levels for a service
To: "Log4J Users List" <log4j-user@logging.apache.org>
Date: Thu, 30 Oct 2008 07:54:19 -0500
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Jake

On Wed, 29 Oct 2008 18:19:44 -0700
  "Dong Zhang" <dzhang@seven.com> wrote:
> Hi Jake,
> 
> I just joined the mail list for a few days, a pity that I missed those 
>topics. 
> It's really appreciated if you can point me to some links related.
> 
> Thanks,
> Dong
> -----Original Message-----
>From: Jacob Kjome [mailto:hoju@visi.com] 
> Sent: Wednesday, October 29, 2008 10:13 PM
> To: Log4J Users List
> Subject: Re: How to create client based log levels for a service
> 
> extending Logger should not be necessary.  Search the list for custom 
> repository selectors or logging per/user or per/thread.  This topic has been 
> covered quite a number of times.  I believe people have posted custom 
> repository selectors that meet this need.  I think the gist is that the 
> selector would choose the logger repository based on an MDC value.  So, for 
> instance, in a webapp, you would use a servlet filter to set the MDC value.  
> Then the selector will use that value to choose the logger repository, each 
> with its own configuration.
> 
> Jake
> 
> On Tue, 28 Oct 2008 22:38:02 -0700
>  "Dong Zhang" <dzhang@seven.com> wrote:
>> Hi,
>> 
>> I just resolved such kind of problem.
>> I believe the service you mentioned is a multithread program, and each 
>>client would run in its own thread (either new a Thread for everyone, or from 
>>a Thread pool in my case).
>> 
>> Let's call it custom logging, the basic idea is use the ThreadLocal to mark 
>>a Thread if it need to enable custom logging:
>> 1. Have a static ThreadLocal<Boolean> object called isCustomLoggingEnabled 
>>in any where it can be accessed.I put it in MyLogger bellow.
>> 2. Extend org.apache.log4j.Logger, say, MyLogger. Override 
>>getEffectiveLevel() method. Like this:
>> -----------------------------------
>>    public Level getEffectiveLevel() {
>>        if(isCustomLoggingEnabled.get().booleanValue()) {
>>            return SevenLoggerAdmin.DEBUG;//any level you want.
>>        } else {
>>            return super.getEffectiveLevel();
>>        }
>>    }
>> -----------------------------------
>> 
>> 3. At the beginning of run(), which means at the beginning of each thread, 
>>judge if the IP is the one you want to enable:
>> Public void run() {
>>    //if IP == y then
>>        MyLogger. isCustomLoggingEnabled.set(new Boolean(true))
>> 
>> //other logic
>> 
>> //reset the flag, if the Thread is shared.
>> MyLogger. isCustomLoggingEnabled.set(new Boolean(false))
>> }
>> 
>> Please let me know if you have any question.
>> 
>> Good luck,
>> Dong
>> -----Original Message-----
>>From: Dulanjanie [mailto:dulanjanie@wso2.com] 
>> Sent: Wednesday, October 29, 2008 11:54 AM
>> To: log4j-user@logging.apache.org
>> Subject: How to create client based log levels for a service
>> 
>> 
>> --
>> ﻿﻿Hi,
>> What i want to do is, change log levels for a certain service based on
>> client IP.
>> say, "increase log level for service x when requests are made by y" 
>> 
>> Does anyone have any idea on how to do this?
>> Is it possible using NDC or MDC?
>> Any help is very much appreciated!
>> 
>> 
>> 
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> 
> 
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