/*

 * Copyright (C) 2016 - EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com>

 *

 * This library is free software; you can redistribute it and/or modify it

 * under the terms of the GNU Lesser General Public License, version 2.1 only,

 * as published by the Free Software Foundation.

 *

 * This library is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License

 * for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with this library; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

package org.lttng.ust.agent.utils;

/**

 * Logging infrastructure for the lttng-ust Java agent. It prints log messages

 * to stderr but only when the environment variable LTTNG_UST_DEBUG is defined.

 *

 * @author Alexandre Montplaisir

 */

public class LttngUstAgentLogger {

	private static final String ENV_VAR_NAME = "LTTNG_UST_DEBUG";

	private static final boolean LOGGING_ENABLED = (System.getenv(ENV_VAR_NAME) == null ? false : true);

	/**

	 * Log event. Will be printed to stderr if the environment variable

	 * "LTTNG_UST_DEBUG" is defined.

	 *

	 * @param c

	 *            The class logging the message (should normally be called with

	 *            {@link #getClass()}).

	 * @param message

	 *            The message to print

	 */

	public static void log(Class c, String message) {

		if (LOGGING_ENABLED) {

			System.err.println(c.getSimpleName() + ": " + message);

		}

	}

}