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Logging
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last updated: 10-Jan-2007
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<p>By default, all logging is done to stdout. This probably isn't what
you want so it is wise to configure your logging to do something more
sensible.</p>
<p>Proxool uses Jakarta's Commons'
<a href="http://jakarta.apache.org/commons/logging.html">Logging</a>
component.</p>
<p>"There are many logging APIs
out there and it is difficult to choose among them. The Logging package is an ultra-thin
bridge between different logging libraries.
This removes compile-time and
run-time dependencies on any particular logging package, and contributors may
write Log implementations for the library of their choice."</p>
<p>The following logging libraries are supported directly:</p>
<div style="margin-left: 8px">
<p><a href="http://jakarta.apache.org/log4j">Log4J</a></p>
<p><a href="http://jakarta.apache.org/avalon/logkit/">LogKit</a></p>
<p><a href="http://java.sun.com/j2se/1.4/docs/api/java/util/logging/package-summary.html">JDK 1.4</a></p>
</div>
<p>However, there is no reason why you shouldn't write your own implementation of
<a href="api/org/logicalcobwebs/proxool/logging/Log.html">Log</a> and log
wherever you wish.</p>
<hr/>
<!--
<p><b>Very simple configuration</b></p>
<p>By default, everything is written to stdout (or is it stderr?) at a logging level of
INFO (which means DEBUG messages are ignored). You can change the level
without having to setup something like Log4J by setting a System property:</p>
<div class="codeSample">
System.setProperty("org.apache.commons.logging.simplelog.defaultlog", "debug");
</div>
<p>But I would highly recommend choosing something like Log4J (I have no experience
of LogKit) for better flexibility and setup. It doesn't take long.</p>
<hr/>
-->
<p><b>Log4J Configuration</b></p>
<p>As an example, this is how we configure Log4J for use when we run Proxool's
unit tests.</p>
<p>First, create your configuration file (which we have called log4j.xml):</p>
<div class="codeSample">
<?xml version="1.0" encoding="UTF-8" ?><br/>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"><br/>
<br/>
<log4j:configuration><br/>
<br/>
<appender name="general" class="org.apache.log4j.DailyRollingFileAppender"><br/>
<param name="File" value="/var/log/proxool/general.log"/><br/>
<param name="DatePattern" value="'.'yyyy-MM-dd"/><br/>
<layout class="org.apache.log4j.PatternLayout"><br/>
<param name="ConversionPattern" value="%d{DATE} [%-5p] %c {%F:%L} - %m%n"/><br/>
</layout><br/>
</appender><br/>
<br/>
<root><br/>
<priority value="DEBUG"/><br/>
<appender-ref ref="general"/><br/>
</root><br/>
<br/>
</log4j:configuration>
</div>
<p>This will log to /var/log/proxool/general.log and then archive the log every day to a new file.</p>
<p>You can easily log each pool to a different file. Just configure an appender for each pool and then
add the following <category> element <b>just before</b> the <root> element. For
example, to set up the log for the 'test' pool:</p>
<div class="codeSample">
<category name="org.logicalcobwebs.proxool.test"><br/>
<appender-ref ref="test-appender"/><br/>
</category>
</div>
<p>And then you just need to point Log4J to that file:</p>
<div class="codeSample">
org.apache.log4j.xml.DOMConfigurator.configureAndWatch(log4jPath);
</div>
<p><b>Using Log4J's Chainsaw GUI log viewer</b></p>
<p>You might find it really useful to use Chainsaw (part of Log4J). It's a Java Swing application that will listen
to log events. You can even set it up to work on a different machine. All you have to do is setup
a special appender:</p>
<div class="codeSample">
<appender name="chainsaw" class="org.apache.log4j.net.SocketAppender"><br/>
<param name="remoteHost" value="localhost"/><br/>
<param name="port" value="4445"/><br/>
<param name="locationInfo" value="true"/><br/>
</appender>
</div>
<p>And then you just startup Chainsaw:</p>
<div class="codeSample">
java -classpath log4j.jar org.apache.log4j.chainsaw.Main
</div>
<p>Obviously, you should include the correct path to your log4j.jar.</p>
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