/*
* Copyright (C) 2015 - EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com>
* Copyright (C) 2014 - Christian Babeux <christian.babeux@efficios.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
import java.io.IOException;
import org.apache.log4j.Appender;
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Logger;
import org.apache.log4j.Level;
import org.lttng.ust.agent.log4j.LttngLogAppender;
/**
* Example application using the LTTng-UST Java log4j agent.
*
* <p>
* To obtain LTTng trace events, you should run the following sequence of
* commands:
* </p>
*
* <ul>
* <li>$ lttng create</li>
* <li>$ lttng enable-event -l -a</li>
* <li>$ lttng start</li>
* <li>(run this program)</li>
* <li>$ lttng stop</li>
* <li>$ lttng view</li>
* <li>$ lttng destroy</li>
* </ul>
*
* @author Alexandre Montplaisir
* @author Christian Babeux
*/
public class Hello {
private static final Logger HELLO_LOG = Logger.getLogger(Hello.class);
/**
* Application start
*
* @param args
* Command-line arguments
* @throws IOException
* If the required native libraries cannot be found. You may
* have to specify "-Djava.library.path=..." on the "java"
* command line.
*/
public static void main(String args[]) throws IOException {
/*
* Set lowest level to make sure all event levels are logged.
* Any jar can override the default log4j rootLogger level
* and a logger with no explicit level defaults to the non-null
* parent level. Events could be ignored if the inherited value
* is to low.
* e.g BSF -> https://issues.apache.org/jira/browse/BSF-24
*/
HELLO_LOG.setLevel(Level.ALL);
/* Start with the default Log4j configuration, which logs to console */
BasicConfigurator.configure();
/*
* Instantiate a LTTng log appender and attach it to the logger, which
* will now send the logged events to UST.
*/
Appender lttngAppender = new LttngLogAppender();
HELLO_LOG.addAppender(lttngAppender);
/*
* Here we've set up the appender programmatically, but it could also be
* defined at runtime, by reading a configuration file for example:
*/
// PropertyConfigurator.configure(fileName);
/* Trigger some tracing events using the Log4j Logger created before. */
HELLO_LOG.info("Hello World, the answer is " + 42);
HELLO_LOG.info("Another info event");
HELLO_LOG.error("An error event");
/* Cleanup */
HELLO_LOG.removeAppender(lttngAppender);
lttngAppender.close();
}
}