/*

 * Copyright (C) 2015 - EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com>

 * Copyright (C) 2013 - David Goulet <dgoulet@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 java.util.logging.Handler;

import java.util.logging.Logger;

import org.lttng.ust.agent.jul.LttngLogHandler;

/**

 * Example application using the LTTng-UST Java JUL agent.

 *

 * 

 * Basically all that is required is to instantiate a {@link LttngLogHandler}

 * and to attach it to a JUL {@link Logger}. Then use the Logger normally to log

 * messages, which will be sent to UST as trace events.

 * 

 * 

 * {@link Logger} names are used as event names on the UST side. This means that

 * by enabling/disabling certain events in the tracing session, you are

 * effectively enabling and disabling Loggers on the Java side. Note that this

 * applies only to {@link LttngLogHandler}'s. If other handlers are attached to

 * the Logger, those will continue logging events normally.

 * 

 *

 * 

 * To obtain LTTng trace events, you should run the following sequence of

 * commands:

 * 

 *

 * 

 * 
$ lttng create

 * 
$ lttng enable-event -j -a

 * 
$ lttng start

 * 
(run this program)

 * 
$ lttng stop

 * 
$ lttng view

 * 
$ lttng destroy

 * 

 *

 * @author Alexandre Montplaisir

 * @author David Goulet

 */

public class Hello {

	/** Class-wide JUL logger object */

	private static final Logger LOGGER = Logger.getLogger(Hello.class.getName());

	/**

	 * 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 {

		/* Instantiate a LTTngLogHandler object, and attach it to our logger */

		Handler lttngHandler = new LttngLogHandler();

		LOGGER.addHandler(lttngHandler);

		/* Log events using the JUL Logger created before. */

		LOGGER.info("Hello World, the answer is " + 42);

		LOGGER.info("Another info event");

		LOGGER.severe("A severe event");

		/* Cleanup */

		LOGGER.removeHandler(lttngHandler);

		lttngHandler.close();

	}

}