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849202d4 DG |
1 | /* |
2 | * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com> | |
3 | * | |
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: | |
10 | * | |
11 | * The above copyright notice and this permission notice shall be included in | |
12 | * all copies or substantial portions of the Software. | |
13 | * | |
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 | |
20 | * IN THE SOFTWARE. | |
21 | */ | |
22 | ||
849202d4 DG |
23 | import java.util.logging.Logger; |
24 | ||
25 | /* | |
26 | * That's the import you need being the path in the liblttng-ust-jul Jar file. | |
27 | */ | |
501f6777 | 28 | import org.lttng.ust.agent.LTTngAgent; |
849202d4 DG |
29 | |
30 | public class Hello | |
31 | { | |
32 | /* Of course :) */ | |
33 | private static final int answer = 42; | |
34 | ||
35 | /* | |
36 | * Static reference to the LTTngAgent. Used to dispose of it at the end | |
37 | * which is recommended but not mandatory to do. | |
38 | */ | |
39 | private static LTTngAgent lttngAgent; | |
40 | ||
41 | public static void main(String args[]) throws Exception | |
42 | { | |
43 | /* | |
44 | * For this example, a custom "hello" logger is created. Note that JUL | |
45 | * has a default "global" that can also be used. | |
46 | */ | |
47 | Logger helloLog = Logger.getLogger("hello"); | |
48 | ||
49 | /* | |
8685da11 | 50 | * Get the LTTngAgent singleton reference. This will also initialize |
849202d4 DG |
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. | |
55 | * | |
8685da11 | 56 | * Note that the LTTngAgent once registered is a separate thread in |
849202d4 DG |
57 | * your Java application. |
58 | */ | |
59 | lttngAgent = LTTngAgent.getLTTngAgent(); | |
60 | ||
61 | /* | |
62 | * Gives you time to do some lttng commands before any event is hit. | |
63 | */ | |
64 | Thread.sleep(5000); | |
65 | ||
66 | /* Trigger a tracing event using the JUL Logger created before. */ | |
67 | helloLog.info("Hello World, the answer is " + answer); | |
68 | ||
69 | /* | |
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: | |
73 | * | |
74 | * $ lttng enable-event -j hello | |
75 | * | |
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. | |
81 | * | |
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). | |
85 | */ | |
86 | Logger helloLogDelayed = Logger.getLogger("hello_delay"); | |
87 | ||
88 | System.out.println("Firing hello delay in 10 seconds..."); | |
89 | Thread.sleep(10000); | |
90 | helloLogDelayed.info("Hello World delayed..."); | |
91 | ||
92 | System.out.println("Cleaning Hello"); | |
93 | ||
94 | /* | |
95 | * Again, this is highly recommended so the session daemon socket gets | |
8685da11 | 96 | * cleaned up explicitly but it is not mandatory to do this step. |
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97 | */ |
98 | lttngAgent.dispose(); | |
99 | } | |
100 | } |