liblttng-ust-java-agent/java/lttng-ust-agent-log4j/org/lttng/ust/agent/log4j/LttngLog4jAgent.java

   1 /*
   2  * Copyright (C) 2015 - 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.log4j;
  19
  20 import org.lttng.ust.agent.AbstractLttngAgent;
  21
  22 /**
  23  * Agent implementation for using the Log4j logger, connecting to a root session
  24  * daemon.
  25  *
  26  * @author Alexandre Montplaisir
  27  */
  28 class LttngLog4jAgent extends AbstractLttngAgent<LttngLogAppender> {
  29
  30         private static LttngLog4jAgent instance = null;
  31
  32         private LttngLog4jAgent() {
  33                 super(Domain.LOG4J);
  34         }
  35
  36         public static synchronized LttngLog4jAgent getInstance() {
  37                 if (instance == null) {
  38                         instance = new LttngLog4jAgent();
  39                 }
  40                 return instance;
  41         }
  42
  43 }