| 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 for the LOG4J domain */ |
| 58 | appenderBuilder = builder.newAppender("Lttng1", "Lttng"); |
| 59 | appenderBuilder.addAttribute("domain", "LOG4J"); |
| 60 | builder.add(appenderBuilder); |
| 61 | |
| 62 | /* Create an Lttng appender for the LOG4J2 domain */ |
| 63 | appenderBuilder = builder.newAppender("Lttng2", "Lttng"); |
| 64 | appenderBuilder.addAttribute("domain", "LOG4J2"); |
| 65 | builder.add(appenderBuilder); |
| 66 | |
| 67 | /* Create a root logger with both appenders attached */ |
| 68 | RootLoggerComponentBuilder rootLogger = builder.newRootLogger(Level.DEBUG); |
| 69 | rootLogger.add(builder.newAppenderRef("Stdout")); |
| 70 | rootLogger.add(builder.newAppenderRef("Lttng1")); |
| 71 | rootLogger.add(builder.newAppenderRef("Lttng2")); |
| 72 | builder.add(rootLogger); |
| 73 | |
| 74 | Configurator.initialize(builder.build()); |
| 75 | |
| 76 | Logger logger = LogManager.getLogger(HelloLog4j2Prog.class); |
| 77 | |
| 78 | /* Trigger some tracing events using the Log4j Logger created before. */ |
| 79 | logger.info("Prog config: Hello World, the answer is " + 42); |
| 80 | logger.info("Prog config: Another info event"); |
| 81 | logger.error("Prog config: An error event"); |
| 82 | } |
| 83 | } |