X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=doc%2Fexamples%2Fjava-log4j%2FHelloLog4j.java;fp=doc%2Fexamples%2Fjava-log4j%2FHelloLog4j.java;h=1870ef440a235bb64b5992e58450e1317450d9b8;hb=6e8e8cb8d7b69e42dbc4c3702f6778d58d4a2371;hp=0000000000000000000000000000000000000000;hpb=2f14557f4175ac05f4ea74ff858be44706118464;p=deliverable%2Flttng-ust.git

diff --git a/doc/examples/java-log4j/HelloLog4j.java b/doc/examples/java-log4j/HelloLog4j.java
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+/*
+ * Copyright (C) 2015 - EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com>
+ * Copyright (C) 2014 - Christian Babeux <christian.babeux@efficios.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+import java.io.IOException;
+
+import org.apache.log4j.Appender;
+import org.apache.log4j.BasicConfigurator;
+import org.apache.log4j.Logger;
+import org.apache.log4j.Level;
+import org.lttng.ust.agent.log4j.LttngLogAppender;
+
+/**
+ * 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>
+ *
+ * @author Alexandre Montplaisir
+ * @author Christian Babeux
+ */
+public class HelloLog4j {
+
+	private static final Logger HELLO_LOG = Logger.getLogger(HelloLog4j.class);
+
+	/**
+	 * Application start
+	 *
+	 * @param args
+	 *            Command-line arguments
+	 * @throws IOException
+	 *             If the required native libraries cannot be found. You may
+	 *             have to specify "-Djava.library.path=..." on the "java"
+	 *             command line.
+	 */
+	public static void main(String args[]) throws IOException {
+
+		/*
+		 * Set lowest level to make sure all event levels are logged.
+		 * Any jar can override the default log4j rootLogger level
+		 * and a logger with no explicit level defaults to the non-null
+		 * parent level. Events could be ignored if the inherited value
+		 * is to low.
+		 * e.g BSF  -> https://issues.apache.org/jira/browse/BSF-24
+		 */
+		HELLO_LOG.setLevel(Level.ALL);
+
+		/* Start with the default Log4j configuration, which logs to console */
+		BasicConfigurator.configure();
+
+		/*
+		 * Instantiate a LTTng log appender and attach it to the logger, which
+		 * will now send the logged events to UST.
+		 */
+		Appender lttngAppender = new LttngLogAppender();
+		HELLO_LOG.addAppender(lttngAppender);
+
+		/*
+		 * Here we've set up the appender programmatically, but it could also be
+		 * defined at runtime, by reading a configuration file for example:
+		 */
+		// PropertyConfigurator.configure(fileName);
+
+		/* Trigger some tracing events using the Log4j Logger created before. */
+		HELLO_LOG.info("Hello World, the answer is " + 42);
+		HELLO_LOG.info("Another info event");
+		HELLO_LOG.error("An error event");
+
+		/* Cleanup */
+		HELLO_LOG.removeAppender(lttngAppender);
+		lttngAppender.close();
+	}
+}