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501f6777 | 1 | /* |
c0c0989a | 2 | * SPDX-License-Identifier: MIT |
501f6777 | 3 | * |
c0c0989a MJ |
4 | * Copyright (C) 2015 EfficiOS Inc. |
5 | * Copyright (C) 2015 Alexandre Montplaisir <alexmonthy@efficios.com> | |
6 | * Copyright (C) 2014 Christian Babeux <christian.babeux@efficios.com> | |
501f6777 | 7 | */ |
501f6777 | 8 | |
d60dfbe4 AM |
9 | import java.io.IOException; |
10 | ||
11 | import org.apache.log4j.Appender; | |
501f6777 | 12 | import org.apache.log4j.BasicConfigurator; |
8685da11 | 13 | import org.apache.log4j.Logger; |
ba5b4491 | 14 | import org.apache.log4j.Level; |
d60dfbe4 | 15 | import org.lttng.ust.agent.log4j.LttngLogAppender; |
501f6777 | 16 | |
5bfeaeca | 17 | /** |
1820ea46 AM |
18 | * Example application using the LTTng-UST Java log4j agent. |
19 | * | |
20 | * <p> | |
21 | * To obtain LTTng trace events, you should run the following sequence of | |
22 | * commands: | |
23 | * </p> | |
24 | * | |
25 | * <ul> | |
26 | * <li>$ lttng create</li> | |
27 | * <li>$ lttng enable-event -l -a</li> | |
28 | * <li>$ lttng start</li> | |
29 | * <li>(run this program)</li> | |
30 | * <li>$ lttng stop</li> | |
31 | * <li>$ lttng view</li> | |
32 | * <li>$ lttng destroy</li> | |
33 | * </ul> | |
5bfeaeca | 34 | * |
d60dfbe4 | 35 | * @author Alexandre Montplaisir |
5bfeaeca AM |
36 | * @author Christian Babeux |
37 | */ | |
38 | public class Hello { | |
39 | ||
d60dfbe4 | 40 | private static final Logger HELLO_LOG = Logger.getLogger(Hello.class); |
501f6777 | 41 | |
5bfeaeca AM |
42 | /** |
43 | * Application start | |
44 | * | |
45 | * @param args | |
46 | * Command-line arguments | |
d60dfbe4 | 47 | * @throws IOException |
1820ea46 AM |
48 | * If the required native libraries cannot be found. You may |
49 | * have to specify "-Djava.library.path=..." on the "java" | |
50 | * command line. | |
5bfeaeca | 51 | */ |
1820ea46 | 52 | public static void main(String args[]) throws IOException { |
ba5b4491 JR |
53 | |
54 | /* | |
55 | * Set lowest level to make sure all event levels are logged. | |
56 | * Any jar can override the default log4j rootLogger level | |
57 | * and a logger with no explicit level defaults to the non-null | |
58 | * parent level. Events could be ignored if the inherited value | |
59 | * is to low. | |
60 | * e.g BSF -> https://issues.apache.org/jira/browse/BSF-24 | |
61 | */ | |
62 | HELLO_LOG.setLevel(Level.ALL); | |
63 | ||
d60dfbe4 | 64 | /* Start with the default Log4j configuration, which logs to console */ |
501f6777 | 65 | BasicConfigurator.configure(); |
d60dfbe4 AM |
66 | |
67 | /* | |
1820ea46 AM |
68 | * Instantiate a LTTng log appender and attach it to the logger, which |
69 | * will now send the logged events to UST. | |
d60dfbe4 AM |
70 | */ |
71 | Appender lttngAppender = new LttngLogAppender(); | |
72 | HELLO_LOG.addAppender(lttngAppender); | |
73 | ||
74 | /* | |
75 | * Here we've set up the appender programmatically, but it could also be | |
76 | * defined at runtime, by reading a configuration file for example: | |
77 | */ | |
78 | // PropertyConfigurator.configure(fileName); | |
501f6777 | 79 | |
1820ea46 | 80 | /* Trigger some tracing events using the Log4j Logger created before. */ |
d60dfbe4 | 81 | HELLO_LOG.info("Hello World, the answer is " + 42); |
1820ea46 AM |
82 | HELLO_LOG.info("Another info event"); |
83 | HELLO_LOG.error("An error event"); | |
501f6777 | 84 | |
1820ea46 AM |
85 | /* Cleanup */ |
86 | HELLO_LOG.removeAppender(lttngAppender); | |
d60dfbe4 | 87 | lttngAppender.close(); |
501f6777 CB |
88 | } |
89 | } |