doc/examples/java-log4j/Hello.java

   1 /*
   2  * Copyright (C) 2015 - EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com>
   3  * Copyright (C) 2014 - Christian Babeux <christian.babeux@efficios.com>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a copy
   6  * of this software and associated documentation files (the "Software"), to
   7  * deal in the Software without restriction, including without limitation the
   8  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
   9  * sell copies of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 import java.io.IOException;
  25
  26 import org.apache.log4j.Appender;
  27 import org.apache.log4j.BasicConfigurator;
  28 import org.apache.log4j.Logger;
  29 import org.lttng.ust.agent.log4j.LttngLogAppender;
  30
  31 /**
  32  * Example application using the LTTng-UST Java JUL agent.
  33  *
  34  * @author Alexandre Montplaisir
  35  * @author Christian Babeux
  36  */
  37 public class Hello {
  38
  39         private static final Logger HELLO_LOG = Logger.getLogger(Hello.class);
  40
  41         /**
  42          * Application start
  43          *
  44          * @param args
  45          *            Command-line arguments
  46          * @throws IOException
  47          * @throws InterruptedException
  48          */
  49         public static void main(String args[]) throws IOException, InterruptedException {
  50                 /* Start with the default Log4j configuration, which logs to console */
  51                 BasicConfigurator.configure();
  52
  53                 /*
  54                  * Add a LTTng log appender to the logger, which will also send the
  55                  * logged events to UST.
  56                  */
  57                 Appender lttngAppender = new LttngLogAppender();
  58                 HELLO_LOG.addAppender(lttngAppender);
  59
  60                 /*
  61                  * Here we've set up the appender programmatically, but it could also be
  62                  * defined at runtime, by reading a configuration file for example:
  63                  */
  64                 // PropertyConfigurator.configure(fileName);
  65
  66                 /*
  67                  * Gives you time to do some lttng commands before any event is hit.
  68                  */
  69                 Thread.sleep(5000);
  70
  71                 /* Trigger a tracing event using the Log4j Logger created before. */
  72                 HELLO_LOG.info("Hello World, the answer is " + 42);
  73
  74                 System.out.println("Firing second event in 5 seconds...");
  75                 Thread.sleep(5000);
  76                 HELLO_LOG.info("Hello World delayed...");
  77
  78                 lttngAppender.close();
  79         }
  80 }