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464c4756 MJ |
1 | /* |
2 | * SPDX-License-Identifier: MIT | |
3 | * | |
4 | * Copyright (C) 2022 EfficiOS Inc. | |
5 | */ | |
6 | ||
7 | import org.apache.logging.log4j.Level; | |
8 | import org.apache.logging.log4j.LogManager; | |
9 | import org.apache.logging.log4j.Logger; | |
10 | import org.apache.logging.log4j.core.config.Configurator; | |
11 | import org.apache.logging.log4j.core.config.builder.api.AppenderComponentBuilder; | |
12 | import org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilder; | |
13 | import org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilderFactory; | |
14 | import org.apache.logging.log4j.core.config.builder.api.LayoutComponentBuilder; | |
15 | import org.apache.logging.log4j.core.config.builder.api.RootLoggerComponentBuilder; | |
16 | import org.apache.logging.log4j.core.config.builder.impl.BuiltConfiguration; | |
17 | ||
18 | /** | |
19 | * Example application using the LTTng-UST Java log4j agent. | |
20 | * | |
21 | * <p> | |
22 | * To obtain LTTng trace events, you should run the following sequence of | |
23 | * commands: | |
24 | * </p> | |
25 | * | |
26 | * <ul> | |
27 | * <li>$ lttng create</li> | |
28 | * <li>$ lttng enable-event -l -a</li> | |
29 | * <li>$ lttng start</li> | |
30 | * <li>(run this program)</li> | |
31 | * <li>$ lttng stop</li> | |
32 | * <li>$ lttng view</li> | |
33 | * <li>$ lttng destroy</li> | |
34 | * </ul> | |
35 | * | |
36 | */ | |
37 | public class HelloLog4j2Prog { | |
38 | ||
39 | /** | |
40 | * Application start | |
41 | * | |
42 | * @param args Command-line arguments | |
43 | */ | |
44 | public static void main(String args[]) { | |
45 | ||
46 | ConfigurationBuilder<BuiltConfiguration> builder = ConfigurationBuilderFactory.newConfigurationBuilder(); | |
47 | ||
48 | /* Layout */ | |
49 | LayoutComponentBuilder standardLayout = builder.newLayout("PatternLayout"); | |
50 | standardLayout.addAttribute("pattern", "%d [%t] %-5level: %msg%n%throwable"); | |
51 | ||
52 | /* Create a console appender */ | |
53 | AppenderComponentBuilder appenderBuilder = builder.newAppender("Stdout", "CONSOLE"); | |
54 | appenderBuilder.add(standardLayout); | |
55 | builder.add(appenderBuilder); | |
56 | ||
57 | /* Create an Lttng appender */ | |
58 | appenderBuilder = builder.newAppender("Lttng", "LTTNG"); | |
59 | builder.add(appenderBuilder); | |
60 | ||
61 | /* Create a root logger with both appenders attached */ | |
62 | RootLoggerComponentBuilder rootLogger = builder.newRootLogger(Level.DEBUG); | |
63 | rootLogger.add(builder.newAppenderRef("Stdout")); | |
64 | rootLogger.add(builder.newAppenderRef("Lttng")); | |
65 | builder.add(rootLogger); | |
66 | ||
67 | Configurator.initialize(builder.build()); | |
68 | ||
69 | Logger logger = LogManager.getLogger(HelloLog4j2Prog.class); | |
70 | ||
71 | /* Trigger some tracing events using the Log4j Logger created before. */ | |
72 | logger.info("Prog config: Hello World, the answer is " + 42); | |
73 | logger.info("Prog config: Another info event"); | |
74 | logger.error("Prog config: An error event"); | |
75 | } | |
76 | } |