| 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 | } |