2 * Copyright (C) 2015 - EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com>
3 * Copyright (C) 2014 - Christian Babeux <christian.babeux@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
;
26 import org
.apache
.log4j
.Appender
;
27 import org
.apache
.log4j
.BasicConfigurator
;
28 import org
.apache
.log4j
.Logger
;
29 import org
.apache
.log4j
.Level
;
30 import org
.lttng
.ust
.agent
.log4j
.LttngLogAppender
;
33 * Example application using the LTTng-UST Java log4j agent.
36 * To obtain LTTng trace events, you should run the following sequence of
41 * <li>$ lttng create</li>
42 * <li>$ lttng enable-event -l -a</li>
43 * <li>$ lttng start</li>
44 * <li>(run this program)</li>
45 * <li>$ lttng stop</li>
46 * <li>$ lttng view</li>
47 * <li>$ lttng destroy</li>
50 * @author Alexandre Montplaisir
51 * @author Christian Babeux
55 private static final Logger HELLO_LOG
= Logger
.getLogger(Hello
.class);
61 * Command-line arguments
63 * If the required native libraries cannot be found. You may
64 * have to specify "-Djava.library.path=..." on the "java"
67 public static void main(String args
[]) throws IOException
{
70 * Set lowest level to make sure all event levels are logged.
71 * Any jar can override the default log4j rootLogger level
72 * and a logger with no explicit level defaults to the non-null
73 * parent level. Events could be ignored if the inherited value
75 * e.g BSF -> https://issues.apache.org/jira/browse/BSF-24
77 HELLO_LOG
.setLevel(Level
.ALL
);
79 /* Start with the default Log4j configuration, which logs to console */
80 BasicConfigurator
.configure();
83 * Instantiate a LTTng log appender and attach it to the logger, which
84 * will now send the logged events to UST.
86 Appender lttngAppender
= new LttngLogAppender();
87 HELLO_LOG
.addAppender(lttngAppender
);
90 * Here we've set up the appender programmatically, but it could also be
91 * defined at runtime, by reading a configuration file for example:
93 // PropertyConfigurator.configure(fileName);
95 /* Trigger some tracing events using the Log4j Logger created before. */
96 HELLO_LOG
.info("Hello World, the answer is " + 42);
97 HELLO_LOG
.info("Another info event");
98 HELLO_LOG
.error("An error event");
101 HELLO_LOG
.removeAppender(lttngAppender
);
102 lttngAppender
.close();
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