RE: Fw: ThreadLocalAppender for log4j? resending - Paul Smith - org.apache.logging.log4j-user

14 messages in org.apache.logging.log4j-userRE: Fw: ThreadLocalAppender for log4j...

From	Sent On	Attachments
Ramakrishna Menon	Mar 1, 2004 5:25 pm
Ceki Gülcü	Mar 2, 2004 2:18 am
Ramakrishna Menon	Mar 2, 2004 7:26 am
Ceki Gülcü	Mar 2, 2004 8:13 am
Paul Smith	Mar 2, 2004 11:56 am
Ramakrishna Menon	Mar 2, 2004 12:12 pm
Paul Smith	Mar 2, 2004 1:22 pm
Ramakrishna Menon	Mar 2, 2004 3:33 pm
Paul Smith	Mar 2, 2004 3:42 pm
Ramakrishna Menon	Mar 2, 2004 4:36 pm
Ramakrishna Menon	Jun 23, 2004 9:11 am
Ramakrishna Menon	Jun 25, 2004 9:44 am
Paul Smith	Jun 27, 2004 2:53 pm
Ramakrishna Menon	Jun 28, 2004 8:39 am

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Subject:	RE: Fw: ThreadLocalAppender for log4j? resending	Actions...
From:	Paul Smith (Paul...@lawlex.com.au)
Date:	Mar 2, 2004 11:56:48 am
List:	org.apache.logging.log4j-user

We got this to work, but the Thread itself had to create the appender, and initialise it with a filter that looked for LoggingEvents that were fired via Thread.currentThread() (matching via .equals(...) to the original Thread).

We found this useful in a situation where a class a way down the call hierachy needed to somehow notify/inform a class way back UP the call hierachy what was going on (and convert it to a User message). Our problem was that we could not introduce any changes into the method signatures so late in the development.

We used this Thread specific appender to "listen" for events generated by the current Thread. This was all stimulated from a discussion Yoav Shapira raised a little while back on the dev list regarding "listeners".

When I get into work I can send an example to this list if anyone is interested?

cheers,

-----Original Message----- From: Ceki Gülcü To: Log4J Users List Sent: 3/3/04 3:14 AM Subject: Re: Fw: ThreadLocalAppender for log4j? resending

Hi Menon,

How can the thread specific appender filter out logging events from other threads and only keep logging events from the "local" thread? Does my question make any sense?

At 07:26 AM 3/2/2004 -0800, Ramakrishna Menon wrote:

Thanx Ceki, The idea is that each web page rendering is based on a request. Each request is almost always a single thread. So if you intercept the messages being generated by log4j - and store them in a ThreadLocal variable (each thread will store it in its own variable), won't you get this functionality?

Best Regards, Menon:) ------------------------------------------------------------- Ramakrishna M. Menon (A Rafi Fan - http://www.mohdrafi.com ) MBA, Berkeley Oracle Corp.-> (650) 506-2343 http://websites.oraclecorp.com/websites/pub/oracleperformance/ -------------------------------------------------------------

----- Original Message ----- From: "Ceki Gülcü" <ce...@qos.ch> To: "Log4J Users List" <log4...@logging.apache.org> Sent: Tuesday, March 02, 2004 2:18 AM Subject: Re: Fw: ThreadLocalAppender for log4j? resending

There is no such appender to my knowledge.

If I understand correctly, you would like to limit log entries to a specific thread. If that is the case, I don't see a thread local appender will help.

At 05:26 PM 3/1/2004 -0800, you wrote:

Not sure if you got this. Resending it... Thanx! Best Regards, Menon:) ------------------------------------------------------------- Ramakrishna M. Menon (A Rafi Fan - http://www.mohdrafi.com ) MBA, Berkeley Oracle Corp.-> (650) 506-2343 http://websites.oraclecorp.com/websites/pub/oracleperformance/ -------------------------------------------------------------

----- Original Message ----- From: "Ramakrishna Menon" <rama...@oracle.com> To: "Log4J Users List" <log4...@logging.apache.org> Sent: Sunday, February 29, 2004 1:17 PM Subject: ThreadLocalAppender for log4j?

Folks My first question to the list - and I admit I am not a log4j

pro:-) - I

did

look around quite a bit before posting...

Basically, the requirement is very simple:

We are using J2EE infrastructure (jsp, middle tier code accessing

data

the database) to render UI. During the UI rendering the code in middle tier accesses the database. Currently, log4j is being used to log the middle

tier

code.

want to intercept the log4j messages transaprently and store them in a ThreadLocal variable in the servlet. This would be helpful in dumping the UI instrumentation code in the middle tier to the URL being rendered based on a URL flag ( e.g. you can change a url http://myapp/mypage to http://myapp/mypage$debug=1

to dump all the middle tier UI rendering logic in the URL. I want

this

happen without changig the current log4j instrumentation code. This means

need

intercept and channel the log4j messages to a ThreadLocal variable ..Hence I thought of writing a ThreadLocalAppender (I am almost done with it.) I basically extended from the AppenderSkeleton for my ThreadLocalAppender and overrode the activateOptions, checkEntryConditions() and subAppend methods. My question is: 1. Is this kind of Appender available already? 2. Is my thinking correct in general about creating a separate Appender class to channel the log4j messages transparently. 3. Does it make sense to submit the code for this Appender so that

can

used correctly? 4. Any other comments?

Thanx a bunch!

----- Original Message ----- From: "Scott Deboy" <sde...@comotivsystems.com> To: "Log4J Users List" <log4...@logging.apache.org> Sent: Sunday, February 29, 2004 12:39 PM Subject: RE: pattern and chainsaw

I agree, log files stored in a non-XML format should be viewable

Chainsaw

v2.

I contributed a Receiver which provides Log4J (and Chainsaw v2)

the

ability

to process events stored in a logfile written using an arbitrary format (PatternLayout).

In order to use this receiver, follow the instructions in the 'installation' section of the Chainsaw v2 page and use the XML configuration

provided

below

Here's a link to the Chainsaw v2 page: http://logging.apache.org/log4j/docs/chainsaw.html

See the javadoc of the new Receiver for an explanation of the available keywords used by the the 'logFormat' param:

http://cvs.apache.org/viewcvs.cgi/logging-log4j/src/java/org/apache/log 4j/v aria/LogFilePatternReceiver.java?rev=1.1&view=auto

Here is the example XML configuration, which can load events

written to

disk

using this PatternLayout format: %r [%t] %-5p %c %x - %m%n

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/" debug="true"> <plugin name="LogFileReceiver" class="org.apache.log4j.varia.LogFilePatternReceiver"> <param name="timestampFormat" value="yyyy-MM-d HH:mm:ss,SSS"/> <param name="logFormat" value="RELATIVETIME [THREAD] LEVEL

LOGGER

* -

MESSAGE"/> <param name="fileName" value="c:/logs/A4.log"/> </plugin> <root> <level value="debug"/> </root> </log4j:configuration>

If anyone has questions, let me know

Scott

-----Original Message----- From: Jean Charles Jabouille [mailto:JEAN...@BULL.NET] Sent: Fri 2/27/2004 1:16 AM To: Log4J Users List Cc: Subject: Re: pattern and chainsaw i'm ok with you, but i don't want a XML file. I want a .log file. I want to use the chainsaw v1. And when i open chainsaw and submit my log file, it's found "0 events". I think that's a pattern problem. So i'dlike to know the standard pattern for Chainsaw v1.

Thanks for your reply

Scott Deboy wrote:

Chainsaw can display log files which were formatted using XMLLayout.

The version of Chainsaw in CVS - see http://logging.apache.org/log4j/docs/chainsaw.html - can also display jdk1.4 util.logging files if they were formatted using XMLFormatter.

Replace the layout specified in your file appender with this:

Scott

-----Original Message----- From: Jean Charles Jabouille [mailto:JEAN...@BULL.NET] Sent: Thursday, February 26, 2004 4:21 AM To: log4...@logging.apache.org Subject: pattern and chainsaw

Hi,

i'd'like to know if there is a specific pattern for log in order to be used with Chainsaw.

My layout is file.log

Thanks for your reply

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-- Ceki Gülcü

For log4j documentation consider "The complete log4j manual" ISBN: 2970036908 http://www.qos.ch/shop/products/clm_t.jsp

-- Ceki Gülcü

For log4j documentation consider "The complete log4j manual" ISBN: 2970036908 http://www.qos.ch/shop/products/clm_t.jsp

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