| 1 | /* |
| 2 | * SPDX-License-Identifier: LGPL-2.1-only |
| 3 | * |
| 4 | * Copyright (C) 2016 EfficiOS Inc. |
| 5 | * Copyright (C) 2016 Alexandre Montplaisir <alexmonthy@efficios.com> |
| 6 | */ |
| 7 | |
| 8 | package org.lttng.ust.agent.utils; |
| 9 | |
| 10 | /** |
| 11 | * Logging infrastructure for the lttng-ust Java agent. It prints log messages |
| 12 | * to stderr but only when the environment variable LTTNG_UST_DEBUG is defined. |
| 13 | * |
| 14 | * @author Alexandre Montplaisir |
| 15 | */ |
| 16 | public class LttngUstAgentLogger { |
| 17 | |
| 18 | private static final String ENV_VAR_NAME = "LTTNG_UST_DEBUG"; |
| 19 | private static final boolean LOGGING_ENABLED = (System.getenv(ENV_VAR_NAME) == null ? false : true); |
| 20 | |
| 21 | /** |
| 22 | * Log event. Will be printed to stderr if the environment variable |
| 23 | * "LTTNG_UST_DEBUG" is defined. |
| 24 | * |
| 25 | * @param c |
| 26 | * The class logging the message (should normally be called with |
| 27 | * {@link #getClass()}). |
| 28 | * @param message |
| 29 | * The message to print |
| 30 | */ |
| 31 | public static void log(Class<?> c, String message) { |
| 32 | if (LOGGING_ENABLED) { |
| 33 | System.err.println(c.getSimpleName() + ": " + message); |
| 34 | } |
| 35 | } |
| 36 | } |