| 1 | /* |
| 2 | * Copyright (C) 2016 - EfficiOS Inc., Alexandre Montplaisir <alexmonthy@efficios.com> |
| 3 | * |
| 4 | * This library is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU Lesser General Public License, version 2.1 only, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This library is distributed in the hope that it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License |
| 11 | * for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU Lesser General Public License |
| 14 | * along with this library; if not, write to the Free Software Foundation, |
| 15 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 16 | */ |
| 17 | |
| 18 | package org.lttng.ust.agent.utils; |
| 19 | |
| 20 | /** |
| 21 | * Logging infrastructure for the lttng-ust Java agent. It prints log messages |
| 22 | * to stderr but only when the environment variable LTTNG_UST_DEBUG is defined. |
| 23 | * |
| 24 | * @author Alexandre Montplaisir |
| 25 | */ |
| 26 | public class LttngUstAgentLogger { |
| 27 | |
| 28 | private static final String ENV_VAR_NAME = "LTTNG_UST_DEBUG"; |
| 29 | private static final boolean LOGGING_ENABLED = (System.getenv(ENV_VAR_NAME) == null ? false : true); |
| 30 | |
| 31 | /** |
| 32 | * Log event. Will be printed to stderr if the environment variable |
| 33 | * "LTTNG_UST_DEBUG" is defined. |
| 34 | * |
| 35 | * @param c |
| 36 | * The class logging the message (should normally be called with |
| 37 | * {@link #getClass()}). |
| 38 | * @param message |
| 39 | * The message to print |
| 40 | */ |
| 41 | public static void log(Class<?> c, String message) { |
| 42 | if (LOGGING_ENABLED) { |
| 43 | System.err.println(c.getSimpleName() + ": " + message); |
| 44 | } |
| 45 | } |
| 46 | } |