2 * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com>
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to
6 * deal in the Software without restriction, including without limitation the
7 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
8 * sell copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
23 import java
.io
.IOException
;
24 import java
.util
.logging
.Level
;
25 import java
.util
.logging
.Logger
;
28 * That's the import you need being the path in the liblttng-ust-jul Jar file.
30 import org
.lttng
.ust
.agent
.LTTngAgent
;
35 private static final int answer
= 42;
38 * Static reference to the LTTngAgent. Used to dispose of it at the end
39 * which is recommended but not mandatory to do.
41 private static LTTngAgent lttngAgent
;
43 public static void main(String args
[]) throws Exception
46 * For this example, a custom "hello" logger is created. Note that JUL
47 * has a default "global" that can also be used.
49 Logger helloLog
= Logger
.getLogger("hello");
52 * Get the LTTngAgent singelton reference. This will also initialize
53 * the Agent and make it register to the session daemon if available.
54 * When this returns, the Agent is registered and fully ready. If no
55 * session daemon is found, it will return and retry every 3 seconds in
56 * the background. TCP is used for communication.
58 * Note that the LTTngAgent once registered is a seperate thread in
59 * your Java application.
61 lttngAgent
= LTTngAgent
.getLTTngAgent();
64 * Gives you time to do some lttng commands before any event is hit.
68 /* Trigger a tracing event using the JUL Logger created before. */
69 helloLog
.info("Hello World, the answer is " + answer
);
72 * From this point on, the above message will be collected in the trace
73 * if the event "hello" is enabled for the JUL domain using the lttng
74 * command line or the lttng-ctl API. For instance:
76 * $ lttng enable-event -j hello
78 * A new logger is created here and fired after. The Agent has an
79 * internal timer that is fired every 5 seconds in order to enable
80 * events that were not found at first but might need to be enabled
81 * when new Logger appears. Unfortunately, there is no way right now to
82 * get notify of that so we have to actively poll.
84 * Using the --all command for instance, it will make this Logger
85 * available in a LTTng trace after the internal Agent's timer is
86 * fired. (lttng enable-event -a -j).
88 Logger helloLogDelayed
= Logger
.getLogger("hello_delay");
90 System
.out
.println("Firing hello delay in 10 seconds...");
92 helloLogDelayed
.info("Hello World delayed...");
94 System
.out
.println("Cleaning Hello");
97 * Again, this is highly recommended so the session daemon socket gets
98 * cleaned up explicitely but it is not mandatory to do this step.
100 lttngAgent
.dispose();
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