/*
* Copyright (C) 2009 eXo Platform SAS.
*
* This 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 2.1 of
* the License, or (at your option) any later version.
*
* This software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.services.log.impl;
import org.exoplatform.services.log.ExoLogFactory;
import org.exoplatform.services.log.Log;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
/**
* An abstract logger factory that maintains a cache of name to logger instance.
* The cache is based on the {@link ConcurrentHashMap} for better scalability.
*
* @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
* @version $Id: AbstractExoLogFactory.java 34394 2009-07-23 09:23:31Z dkatayev $
*/
public abstract class AbstractExoLogFactory implements ExoLogFactory
{
/** . */
private final ConcurrentMap<String, Log> loggers = new ConcurrentHashMap<String, Log>();
/**
* Obtain a specified logger.
*
* @param name the logger name
* @return the logger
*/
protected abstract Log getLogger(String name);
/**
* {@inheritDoc}
*/
public final Log getExoLogger(String name)
{
if (name == null)
{
throw new IllegalArgumentException("The logger name cannot be null");
}
Log exoLogger = loggers.get(name);
if (exoLogger == null)
{
exoLogger = getLogger(name);
Log phantom = loggers.putIfAbsent(name, exoLogger);
if (phantom != null)
{
exoLogger = phantom;
}
}
return exoLogger;
}
/**
* {@inheritDoc}
*/
public final Log getExoLogger(Class clazz)
{
if (clazz == null)
{
throw new IllegalArgumentException("The logger class cannot be null");
}
return getExoLogger(clazz.getName());
}
}