/*
* eXist Open Source Native XML Database
* Copyright (C) 2001-07 The eXist Project
* http://exist-db.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*
* $Id$
*/
package org.exist.management;
import org.apache.log4j.Logger;
public class AgentFactory {
private final static Logger LOG = Logger.getLogger(AgentFactory.class);
private static Agent instance = null;
public static Agent getInstance() {
if (instance == null) {
String className = System.getProperty("exist.jmxagent", "org.exist.management.impl.JMXAgent");
try {
Class<?> clazz = Class.forName(className);
if (!Agent.class.isAssignableFrom(clazz)) {
LOG.warn("Class " + className + " does not implement interface Agent. Using fallback.");
} else {
instance = (Agent) clazz.newInstance();
}
} catch (ClassNotFoundException e) {
LOG.warn("Class not found for JMX agent: " + className);
} catch (IllegalAccessException e) {
LOG.warn("Failed to instantiate class for JMX agent: " + className);
} catch (InstantiationException e) {
LOG.warn("Failed to instantiate class for JMX agent: " + className);
}
if (instance == null)
instance = new DummyAgent();
}
return instance;
}
}