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464c4756 MJ |
1 | /* |
2 | * SPDX-License-Identifier: MIT | |
3 | * | |
4 | * Copyright (C) 2022 EfficiOS Inc. | |
5 | */ | |
6 | ||
7 | import java.net.URI; | |
8 | import java.util.ArrayList; | |
9 | ||
10 | import org.apache.logging.log4j.LogManager; | |
11 | import org.apache.logging.log4j.Logger; | |
12 | import org.apache.logging.log4j.core.LoggerContext; | |
13 | ||
14 | /** | |
15 | * Example application using the LTTng-UST Java log4j agent. | |
16 | * | |
17 | * <p> | |
18 | * To obtain LTTng trace events, you should run the following sequence of | |
19 | * commands: | |
20 | * </p> | |
21 | * | |
22 | * <ul> | |
23 | * <li>$ lttng create</li> | |
24 | * <li>$ lttng enable-event -l -a</li> | |
25 | * <li>$ lttng start</li> | |
26 | * <li>(run this program)</li> | |
27 | * <li>$ lttng stop</li> | |
28 | * <li>$ lttng view</li> | |
29 | * <li>$ lttng destroy</li> | |
30 | * </ul> | |
31 | * | |
32 | */ | |
33 | public class HelloLog4j2Ctx { | |
34 | ||
35 | /** | |
36 | * Application start | |
37 | * | |
38 | * @param args Command-line arguments | |
39 | */ | |
40 | public static void main(String args[]) { | |
41 | ||
42 | URI configFileUri1 = URI.create("./log4j2.ctx1.xml"); | |
43 | URI configFileUri2 = URI.create("./log4j2.ctx2.xml"); | |
44 | ||
45 | LoggerContext loggerContext1 = (LoggerContext) LogManager.getContext(ClassLoader.getSystemClassLoader(), false, | |
46 | configFileUri1); | |
47 | LoggerContext loggerContext2 = (LoggerContext) LogManager.getContext(ClassLoader.getSystemClassLoader(), false, | |
48 | configFileUri2); | |
49 | ||
50 | /* Loggers in different contexts with the same name. */ | |
51 | Logger logger1ctx1 = loggerContext1.getLogger(HelloLog4j2Ctx.class); | |
52 | Logger logger1ctx2 = loggerContext2.getLogger(HelloLog4j2Ctx.class); | |
53 | ||
54 | Logger logger2ctx1 = loggerContext1.getLogger("Logger2"); | |
55 | Logger logger3ctx2 = loggerContext2.getLogger("Logger3"); | |
56 | ||
57 | ArrayList<Logger> loggers = new ArrayList<Logger>(); | |
58 | ||
59 | loggers.add(logger1ctx1); | |
60 | loggers.add(logger1ctx2); | |
61 | loggers.add(logger2ctx1); | |
62 | loggers.add(logger3ctx2); | |
63 | ||
64 | for (Logger logger : loggers) { | |
65 | /* Trigger some tracing events using the Log4j Logger created before. */ | |
66 | logger.info("Context config: Hello World, the answer is " + 42); | |
67 | logger.info("Context config: Another info event"); | |
68 | logger.error("Context config: An error event"); | |
69 | } | |
70 | } | |
71 | } |