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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 | } |