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501f6777 | 1 | /* |
d60dfbe4 | 2 | * Copyright (C) 2015 - EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com> |
501f6777 CB |
3 | * Copyright (C) 2014 - Christian Babeux <christian.babeux@efficios.com> |
4 | * | |
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: | |
11 | * | |
12 | * The above copyright notice and this permission notice shall be included in | |
13 | * all copies or substantial portions of the Software. | |
14 | * | |
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 | |
21 | * IN THE SOFTWARE. | |
22 | */ | |
501f6777 | 23 | |
d60dfbe4 AM |
24 | import java.io.IOException; |
25 | ||
26 | import org.apache.log4j.Appender; | |
501f6777 | 27 | import org.apache.log4j.BasicConfigurator; |
8685da11 | 28 | import org.apache.log4j.Logger; |
ba5b4491 | 29 | import org.apache.log4j.Level; |
d60dfbe4 | 30 | import org.lttng.ust.agent.log4j.LttngLogAppender; |
501f6777 | 31 | |
5bfeaeca | 32 | /** |
1820ea46 AM |
33 | * Example application using the LTTng-UST Java log4j agent. |
34 | * | |
35 | * <p> | |
36 | * To obtain LTTng trace events, you should run the following sequence of | |
37 | * commands: | |
38 | * </p> | |
39 | * | |
40 | * <ul> | |
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> | |
48 | * </ul> | |
5bfeaeca | 49 | * |
d60dfbe4 | 50 | * @author Alexandre Montplaisir |
5bfeaeca AM |
51 | * @author Christian Babeux |
52 | */ | |
53 | public class Hello { | |
54 | ||
d60dfbe4 | 55 | private static final Logger HELLO_LOG = Logger.getLogger(Hello.class); |
501f6777 | 56 | |
5bfeaeca AM |
57 | /** |
58 | * Application start | |
59 | * | |
60 | * @param args | |
61 | * Command-line arguments | |
d60dfbe4 | 62 | * @throws IOException |
1820ea46 AM |
63 | * If the required native libraries cannot be found. You may |
64 | * have to specify "-Djava.library.path=..." on the "java" | |
65 | * command line. | |
5bfeaeca | 66 | */ |
1820ea46 | 67 | public static void main(String args[]) throws IOException { |
ba5b4491 JR |
68 | |
69 | /* | |
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 | |
74 | * is to low. | |
75 | * e.g BSF -> https://issues.apache.org/jira/browse/BSF-24 | |
76 | */ | |
77 | HELLO_LOG.setLevel(Level.ALL); | |
78 | ||
d60dfbe4 | 79 | /* Start with the default Log4j configuration, which logs to console */ |
501f6777 | 80 | BasicConfigurator.configure(); |
d60dfbe4 AM |
81 | |
82 | /* | |
1820ea46 AM |
83 | * Instantiate a LTTng log appender and attach it to the logger, which |
84 | * will now send the logged events to UST. | |
d60dfbe4 AM |
85 | */ |
86 | Appender lttngAppender = new LttngLogAppender(); | |
87 | HELLO_LOG.addAppender(lttngAppender); | |
88 | ||
89 | /* | |
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: | |
92 | */ | |
93 | // PropertyConfigurator.configure(fileName); | |
501f6777 | 94 | |
1820ea46 | 95 | /* Trigger some tracing events using the Log4j Logger created before. */ |
d60dfbe4 | 96 | HELLO_LOG.info("Hello World, the answer is " + 42); |
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97 | HELLO_LOG.info("Another info event"); |
98 | HELLO_LOG.error("An error event"); | |
501f6777 | 99 | |
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100 | /* Cleanup */ |
101 | HELLO_LOG.removeAppender(lttngAppender); | |
d60dfbe4 | 102 | lttngAppender.close(); |
501f6777 CB |
103 | } |
104 | } |