/*
* Copyright 1999-2006 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
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);
}
}