/*

 * Copyright (C) 2015 - 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.Level;

import org.lttng.ust.agent.ILttngHandler;

import org.lttng.ust.agent.filter.FilterChangeNotifier;

import org.lttng.ust.agent.filter.IFilterChangeListener;

import org.lttng.ust.agent.jul.LttngLogHandler;

import org.lttng.ust.agent.session.EventRule;

import org.lttng.ust.agent.session.LogLevelSelector;

/**

 * Example usage of a {@link IFilterChangeListener}.

 *

 * This listener will simply print to stdout the notifications it receives. To

 * try it, run the program, then issue "lttng enable-event" and

 * "lttng disable-event" commands for the JUL domain.

 *

 * @author Alexandre Montplaisir

 */

public class FilterChangeListenerExample {

	private static class ExampleFilterChangeListener implements IFilterChangeListener {

		@Override

		public void eventRuleAdded(EventRule rule) {

			System.out.println();

			System.out.println("New event rule enabled:");

			System.out.println("Event name: " + rule.getEventName());

			System.out.println(printLogLevel(rule.getLogLevelSelector()));

			System.out.println("Filter string: " + rule.getFilterString());

		}

		@Override

		public void eventRuleRemoved(EventRule rule) {

			System.out.println();

			System.out.println("Event rule disabled:");

			System.out.println("Event name: " + rule.getEventName());

			System.out.println(printLogLevel(rule.getLogLevelSelector()));

			System.out.println("Filter string: " + rule.getFilterString());

		}

		/**

		 * Convenience method to print integer log level values into their JUL

		 * equivalent.

		 */

		private static String printLogLevel(LogLevelSelector lls) {

			String llname = Level.parse(String.valueOf(lls.getLogLevel())).getName();

			return "Log level: " + llname + ", filter type: " + lls.getLogLevelType().toString();

		}

	}

	/**

	 * Run the program.

	 *

	 * @param args

	 *            Command-line arguments (not used)

	 * @throws IOException

	 */

	public static void main(String args[]) throws IOException {

		/* We need at least one log handler to activate the LTTng agent */

		ILttngHandler handler = new LttngLogHandler();

		/* Create a listener and register it to the manager */

		IFilterChangeListener listener = new ExampleFilterChangeListener();

		FilterChangeNotifier.getInstance().registerListener(listener);

		System.out.println("Press Enter to finish.");

		System.in.read();

		/* Unregister the listener */

		FilterChangeNotifier.getInstance().unregisterListener(listener);

		/* Cleanup the log handler we created */

		handler.close();

	}

}