/*
* Copyright (C) The Apache Software Foundation. All rights reserved.
*
* This software is published under the terms of the Apache Software
* License version 1.1, a copy of which has been included with this
* distribution in the LICENSE.txt file. */
package subclass;
import org.apache.log4j.*;
import org.apache.log4j.PropertyConfigurator;
import org.apache.log4j.joran.JoranConfigurator;
/**
A simple example showing logger subclassing.
<p>The example should make it clear that subclasses follow the
hierarchy. You should also try running this example with a <a
href="doc-files/mycat.bad">bad</a> and <a
href="doc-files/mycat.good">good</a> configuration file samples.
<p>See <b><a
href="doc-files/MyLogger.java">source code</a></b> for more details.
*/
public class MyLoggerTest {
/**
When called wihtout arguments, this program will just print
<pre>
DEBUG [main] some.cat - Hello world.
</pre>
and exit.
<b>However, it can be called with a configuration file in XML or
properties format.
*/
static public void main(String[] args) {
if(args.length == 0) {
// Note that the appender is added to root but that the log
// request is made to an instance of MyLogger. The output still
// goes to System.out.
Logger root = Logger.getRootLogger();
Layout layout = new PatternLayout("%p [%t] %c (%F:%L) - %m%n");
root.addAppender(new ConsoleAppender(layout, ConsoleAppender.SYSTEM_OUT));
}
else if(args.length == 1) {
if(args[0].endsWith("xml")) {
JoranConfigurator jc = new JoranConfigurator();
jc.doConfigure(args[0], LogManager.getLoggerRepository());
} else {
PropertyConfigurator.configure(args[0]);
}
} else {
usage("Incorrect number of parameters.");
}
try {
MyLogger c = (MyLogger) MyLogger.getLogger("some.cat");
c.trace("Hello");
c.debug("Hello");
} catch(ClassCastException e) {
System.err.println("Did you forget to set the factory in the config file?");
e.printStackTrace(System.err);
}
}
static
void usage(String errMsg) {
System.err.println(errMsg);
System.err.println("\nUsage: "+MyLogger.class.getName() + "[configFile]\n"
+ " where *configFile* is an optional configuration file, "+
"either in properties or XML format.");
System.exit(1);
}
}