2 * Copyright (C) 2015 - EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com>
3 * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com>
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to
7 * deal in the Software without restriction, including without limitation the
8 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
9 * sell copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 import java
.io
.IOException
;
25 import java
.util
.logging
.Handler
;
26 import java
.util
.logging
.Logger
;
28 import org
.lttng
.ust
.agent
.jul
.LttngLogHandler
;
31 * Example application using the LTTng-UST Java JUL agent.
34 * Basically all that is required is to instantiate a {@link LttngLogHandler}
35 * and to attach it to a JUL {@link Logger}. Then use the Logger normally to log
36 * messages, which will be sent to UST as trace events.
39 * {@link Logger} names are used as event names on the UST side. This means that
40 * by enabling/disabling certain events in the tracing session, you are
41 * effectively enabling and disabling Loggers on the Java side. Note that this
42 * applies only to {@link LttngLogHandler}'s. If other handlers are attached to
43 * the Logger, those will continue logging events normally.
47 * To obtain LTTng trace events, you should run the following sequence of
52 * <li>$ lttng create</li>
53 * <li>$ lttng enable-event -j -a</li>
54 * <li>$ lttng start</li>
55 * <li>(run this program)</li>
56 * <li>$ lttng stop</li>
57 * <li>$ lttng view</li>
58 * <li>$ lttng destroy</li>
61 * @author Alexandre Montplaisir
62 * @author David Goulet
66 /** Class-wide JUL logger object */
67 private static final Logger LOGGER
= Logger
.getLogger(Hello
.class.getName());
73 * Command-line arguments
75 * If the required native libraries cannot be found. You may
76 * have to specify "-Djava.library.path=..." on the "java"
79 public static void main(String args
[]) throws IOException
{
81 /* Instantiate a LTTngLogHandler object, and attach it to our logger */
82 Handler lttngHandler
= new LttngLogHandler();
83 LOGGER
.addHandler(lttngHandler
);
85 /* Log events using the JUL Logger created before. */
86 LOGGER
.info("Hello World, the answer is " + 42);
87 LOGGER
.info("Another info event");
88 LOGGER
.severe("A severe event");
91 LOGGER
.removeHandler(lttngHandler
);
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