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/*
* Copyright (C) 2016 - EfficiOS Inc., Alexandre Montplaisir <alexmonthy@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 java.util.logging.Handler;
import java.util.logging.Logger;
import org.lttng.ust.agent.context.ContextInfoManager;
import org.lttng.ust.agent.context.IContextInfoRetriever;
import org.lttng.ust.agent.jul.LttngLogHandler;
/**
* Example program defining a application context retriever, which allows
* attaching application-defined contexts to trace events.
*
* FIXME Use custom context names, and several names/types
*
* <p>
* Usage:
* <ul>
* <li>$ lttng create</li>
* <li>$ lttng enable-event -j -a</li>
* <li>$ lttng add-context -j -t '$app.myprovider:mystringcontext'</li>
* <li>$ lttng add-context -j -t '$app.myprovider:myshortcontext'</li>
* <li>$ lttng start</li>
* <li>(run this program)</li>
* <li>$ lttng stop</li>
* <li>$ lttng view</li>
* <li>$ lttng destroy</li>
* </ul>
* </p>
*
* The events present in the resulting trace should carry the context
* information defined in the example retriever.
*
* @author Alexandre Montplaisir
*/
public class ApplicationContextExample {
/** Class-wide JUL logger object */
private static final Logger LOGGER = Logger.getLogger(ApplicationContextExample.class.getName());
private static final String RETRIEVER_NAME = "myprovider";
private static final String CONTEXT_NAME_STRING = "mystringcontext";
private static final String CONTEXT_NAME_SHORT = "myshortcontext";
private static class ExampleContextInfoRetriever implements IContextInfoRetriever {
@Override
public Object retrieveContextInfo(String key) {
if (CONTEXT_NAME_SHORT.equals(key)) {
return (short) 42;
} else if (CONTEXT_NAME_STRING.equals(key)) {
return "context-value!";
} else {
return null;
}
}
}
/**
* Application start
*
* @param args
* Command-line arguments
* @throws IOException
* @throws InterruptedException
*/
public static void main(String args[]) throws IOException, InterruptedException {
/* Instantiate and attach a logger object */
Handler lttngHandler = new LttngLogHandler();
LOGGER.addHandler(lttngHandler);
/* Instantiate and register the context retriever */
IContextInfoRetriever cir = new ExampleContextInfoRetriever();
ContextInfoManager.getInstance().registerContextInfoRetriever(RETRIEVER_NAME, cir);
/*
* Make sure you have a LTTng session running with the appropriate
* events and contexts enabled! See the class Javadoc.
*/
/* Trigger a tracing event using the JUL Logger created before. */
LOGGER.info("Log event #1");
LOGGER.warning("Log event #2");
LOGGER.severe("Log event #3");
/* Unregister our context retriever, and dispose the log handler */
ContextInfoManager.getInstance().unregisterContextInfoRetriever(RETRIEVER_NAME);
lttngHandler.close();
}
}
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