588ec815daf302f950ed7db355093139a6c636a3
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
.util
.logging
.Logger
;
26 * That's the import you need being the path in the liblttng-ust-jul Jar file.
28 import org
.lttng
.ust
.agent
.LTTngAgent
;
33 private static final int answer
= 42;
36 * Static reference to the LTTngAgent. Used to dispose of it at the end
37 * which is recommended but not mandatory to do.
39 private static LTTngAgent lttngAgent
;
41 public static void main(String args
[]) throws Exception
44 * For this example, a custom "hello" logger is created. Note that JUL
45 * has a default "global" that can also be used.
47 Logger helloLog
= Logger
.getLogger("hello");
50 * Get the LTTngAgent singleton reference. This will also initialize
51 * the Agent and make it register to the session daemon if available.
52 * When this returns, the Agent is registered and fully ready. If no
53 * session daemon is found, it will return and retry every 3 seconds in
54 * the background. TCP is used for communication.
56 * Note that the LTTngAgent once registered is a separate thread in
57 * your Java application.
59 lttngAgent
= LTTngAgent
.getLTTngAgent();
62 * Gives you time to do some lttng commands before any event is hit.
66 /* Trigger a tracing event using the JUL Logger created before. */
67 helloLog
.info("Hello World, the answer is " + answer
);
70 * From this point on, the above message will be collected in the trace
71 * if the event "hello" is enabled for the JUL domain using the lttng
72 * command line or the lttng-ctl API. For instance:
74 * $ lttng enable-event -j hello
76 * A new logger is created here and fired after. The Agent has an
77 * internal timer that is fired every 5 seconds in order to enable
78 * events that were not found at first but might need to be enabled
79 * when new Logger appears. Unfortunately, there is no way right now to
80 * get notify of that so we have to actively poll.
82 * Using the --all command for instance, it will make this Logger
83 * available in a LTTng trace after the internal Agent's timer is
84 * fired. (lttng enable-event -a -j).
86 Logger helloLogDelayed
= Logger
.getLogger("hello_delay");
88 System
.out
.println("Firing hello delay in 10 seconds...");
90 helloLogDelayed
.info("Hello World delayed...");
92 System
.out
.println("Cleaning Hello");
95 * Again, this is highly recommended so the session daemon socket gets
96 * cleaned up explicitly but it is not mandatory to do this step.
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