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/*
* SPDX-License-Identifier: MIT
*
* Copyright (C) 2022 EfficiOS Inc.
*/
import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.config.Configurator;
import org.apache.logging.log4j.core.config.builder.api.AppenderComponentBuilder;
import org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilder;
import org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilderFactory;
import org.apache.logging.log4j.core.config.builder.api.LayoutComponentBuilder;
import org.apache.logging.log4j.core.config.builder.api.RootLoggerComponentBuilder;
import org.apache.logging.log4j.core.config.builder.impl.BuiltConfiguration;
/**
* Example application using the LTTng-UST Java log4j agent.
*
* <p>
* To obtain LTTng trace events, you should run the following sequence of
* commands:
* </p>
*
* <ul>
* <li>$ lttng create</li>
* <li>$ lttng enable-event -l -a</li>
* <li>$ lttng start</li>
* <li>(run this program)</li>
* <li>$ lttng stop</li>
* <li>$ lttng view</li>
* <li>$ lttng destroy</li>
* </ul>
*
*/
public class HelloLog4j2Prog {
/**
* Application start
*
* @param args Command-line arguments
*/
public static void main(String args[]) {
ConfigurationBuilder<BuiltConfiguration> builder = ConfigurationBuilderFactory.newConfigurationBuilder();
/* Layout */
LayoutComponentBuilder standardLayout = builder.newLayout("PatternLayout");
standardLayout.addAttribute("pattern", "%d [%t] %-5level: %msg%n%throwable");
/* Create a console appender */
AppenderComponentBuilder appenderBuilder = builder.newAppender("Stdout", "Console");
appenderBuilder.add(standardLayout);
builder.add(appenderBuilder);
/* Create an Lttng appender for the LOG4J domain */
appenderBuilder = builder.newAppender("Lttng1", "Lttng");
appenderBuilder.addAttribute("domain", "LOG4J");
builder.add(appenderBuilder);
/* Create an Lttng appender for the LOG4J2 domain */
appenderBuilder = builder.newAppender("Lttng2", "Lttng");
appenderBuilder.addAttribute("domain", "LOG4J2");
builder.add(appenderBuilder);
/* Create a root logger with both appenders attached */
RootLoggerComponentBuilder rootLogger = builder.newRootLogger(Level.DEBUG);
rootLogger.add(builder.newAppenderRef("Stdout"));
rootLogger.add(builder.newAppenderRef("Lttng1"));
rootLogger.add(builder.newAppenderRef("Lttng2"));
builder.add(rootLogger);
Configurator.initialize(builder.build());
Logger logger = LogManager.getLogger(HelloLog4j2Prog.class);
/* Trigger some tracing events using the Log4j Logger created before. */
logger.info("Prog config: Hello World, the answer is " + 42);
logger.info("Prog config: Another info event");
logger.error("Prog config: An error event");
}
}
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