/*
* Copyright (C) 2015 - EfficiOS Inc., Alexandre Montplaisir
* Copyright (C) 2013 - David Goulet
*
* 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();
}
}