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86 lines
2.8 KiB
Java
86 lines
2.8 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package examples.subclass;
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import org.apache.log4j.*;
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import org.apache.log4j.xml.DOMConfigurator;
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import org.apache.log4j.PropertyConfigurator;
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import org.apache.log4j.helpers.LogLog;
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/**
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A simple example showing logger subclassing.
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<p>The example should make it clear that subclasses follow the
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hierarchy. You should also try running this example with a <a
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href="doc-files/mycat.bad">bad</a> and <a
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href="doc-files/mycat.good">good</a> configuration file samples.
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<p>See <b><a
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href="doc-files/MyLogger.java">source code</a></b> for more details.
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*/
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public class MyLoggerTest {
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/**
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When called wihtout arguments, this program will just print
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<pre>
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DEBUG [main] some.cat - Hello world.
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</pre>
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and exit.
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<b>However, it can be called with a configuration file in XML or
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properties format.
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*/
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static public void main(String[] args) {
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if(args.length == 0) {
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// Note that the appender is added to root but that the log
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// request is made to an instance of MyLogger. The output still
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// goes to System.out.
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Logger root = Logger.getRootLogger();
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Layout layout = new PatternLayout("%p [%t] %c (%F:%L) - %m%n");
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root.addAppender(new ConsoleAppender(layout, ConsoleAppender.SYSTEM_OUT));
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}
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else if(args.length == 1) {
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if(args[0].endsWith("xml")) {
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DOMConfigurator.configure(args[0]);
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} else {
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PropertyConfigurator.configure(args[0]);
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}
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} else {
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usage("Incorrect number of parameters.");
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}
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try {
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MyLogger c = (MyLogger) MyLogger.getLogger("some.cat");
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c.trace("Hello");
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c.debug("Hello");
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} catch(ClassCastException e) {
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LogLog.error("Did you forget to set the factory in the config file?", e);
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}
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}
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static
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void usage(String errMsg) {
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System.err.println(errMsg);
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System.err.println("\nUsage: "+MyLogger.class.getName() + "[configFile]\n"
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+ " where *configFile* is an optional configuration file, "+
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"either in properties or XML format.");
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System.exit(1);
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}
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}
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