cziegeler 2003/03/06 03:26:10
Added: logger/src/java/org/apache/avalon/excalibur/logger
DefaultLoggerManager.java
Log:
A first try of a default logger manager that wrapps the real implementation (logkit,
log4j). Does this make sense?
Revision Changes Path
1.1
avalon-excalibur/logger/src/java/org/apache/avalon/excalibur/logger/DefaultLoggerManager.java
Index: DefaultLoggerManager.java
===================================================================
/*
============================================================================
The Apache Software License, Version 1.1
============================================================================
Copyright (C) @year@ The Apache Software Foundation. All rights reserved.
Redistribution and use in source and binary forms, with or without modifica-
tion, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
3. The end-user documentation included with the redistribution, if any, must
include the following acknowledgment: "This product includes software
developed by the Apache Software Foundation (http://www.apache.org/)."
Alternately, this acknowledgment may appear in the software itself, if
and wherever such third-party acknowledgments normally appear.
4. The names "Jakarta", "Avalon", "Excalibur" and "Apache Software Foundation"
must not be used to endorse or promote products derived from this software
without prior written permission. For written permission, please contact
[EMAIL PROTECTED]
5. Products derived from this software may not be called "Apache", nor may
"Apache" appear in their name, without prior written permission of the
Apache Software Foundation.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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Apache Software Foundation, please see <http://www.apache.org/>.
*/
package org.apache.avalon.excalibur.logger;
import org.apache.avalon.framework.activity.Disposable;
import org.apache.avalon.framework.configuration.Configurable;
import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.avalon.framework.context.Context;
import org.apache.avalon.framework.context.ContextException;
import org.apache.avalon.framework.context.Contextualizable;
import org.apache.avalon.framework.logger.LogEnabled;
import org.apache.avalon.framework.logger.Logger;
import org.apache.avalon.framework.parameters.ParameterException;
import org.apache.avalon.framework.parameters.Parameterizable;
import org.apache.avalon.framework.parameters.Parameters;
import org.apache.avalon.framework.service.ServiceException;
import org.apache.avalon.framework.service.ServiceManager;
import org.apache.avalon.framework.service.Serviceable;
import org.apache.avalon.framework.thread.ThreadSafe;
/**
* This logger manager is a wrapper around all other "real" logger managers.
* The idea is to have one single configuration file where you can
* define, which logger manager (Log4J, LogKit etc.) you want to use, so
* you don't have to hard-code this.
*
* FIXME: This is only a start, it's neither tested not run
*
* @author <a href="mailto:[EMAIL PROTECTED]">Carsten Ziegeler</a>
* @version CVS $Revision: 1.1 $ $Date: 2003/03/06 11:26:10 $
*/
public final class DefaultLoggerManager
implements LoggerManager,
ThreadSafe,
LogEnabled,
Contextualizable,
Configurable,
Serviceable,
Disposable
{
/** The used LoggerManager */
private LoggerManager m_loggermanager;
/** The context object */
private Context m_context;
/** The logger used to log output from the logger manager. */
private Logger m_logger;
/** The prefix */
private String m_prefix;
/** The service manager */
private ServiceManager m_manager;
/** Do we have to dispose the manager */
private boolean m_disposeManager = false;
/**
* Creates a new <code>DefaultLoggerManager</code>. .
*/
public DefaultLoggerManager()
{
}
/**
* Creates a new <code>DefaultLoggerManager</code>. .
*/
public DefaultLoggerManager(String prefix)
{
m_prefix = prefix;
}
/**
* Provide a logger.
*
* @param logger the logger
**/
public void enableLogging( final Logger logger )
{
m_logger = logger;
}
/**
* Return the Logger for the specified category.
*/
public final Logger getLoggerForCategory( final String categoryName )
{
return m_loggermanager.getLoggerForCategory( categoryName );
}
/**
* Return the default Logger. This is basically the same
* as getting the Logger for the "" category.
*/
public final Logger getDefaultLogger()
{
return m_loggermanager.getDefaultLogger();
}
/**
* Reads a context object that will be supplied to the logger manager.
*
* @param context The context object.
* @throws ContextException if the context is malformed
*/
public final void contextualize( final Context context )
throws ContextException
{
m_context = context;
}
/**
* Reads a configuration object and creates the category mapping.
*
* @param configuration The configuration object.
* @throws ConfigurationException if the configuration is malformed
*/
public final void configure( final Configuration configuration )
throws ConfigurationException
{
// first we test for the class name to use
final String className = configuration.getAttribute("manager-class", null);
if ( null != className )
{
// is a prefix available?
final String prefix = configuration.getAttribute("prefix", m_prefix);
// create logger manager
try {
if ( null == prefix )
{
m_loggermanager = (LoggerManager)Class.forName( className
).newInstance();
}
else
{
m_loggermanager = (LoggerManager)Class.forName( className )
.getConstructor(new
Class[] {String.class})
.newInstance(new Object[]
{prefix});
}
}
catch (Exception e)
{
throw new ConfigurationException("Unable to create new logger
manager for class " + className, e);
}
// now test for some lifecycle interfaces
if ( m_loggermanager instanceof LogEnabled )
{
((LogEnabled)m_loggermanager).enableLogging( m_logger);
}
if ( m_loggermanager instanceof Contextualizable)
{
try
{
((Contextualizable)m_loggermanager).contextualize( m_context );
}
catch (ContextException ce)
{
throw new ConfigurationException("Unable to contextualize new
logger manager.", ce);
}
}
if ( m_loggermanager instanceof Configurable )
{
((Configurable)m_loggermanager).configure(configuration.getChildren()[0]);
}
else if ( m_loggermanager instanceof Parameterizable )
{
try
{
((Parameterizable)m_loggermanager).parameterize(Parameters.fromConfiguration(configuration.getChildren()[0]));
}
catch (ParameterException pe)
{
throw new ConfigurationException("Unable to parameterize new
logger manager.", pe);
}
}
}
else
{
// now test for role name
final String roleName = configuration.getAttribute("manager-role", null);
if ( null == roleName )
{
throw new ConfigurationException("The LoggerManager needs either a
manager-role or a manager-class");
}
try {
m_loggermanager = (LoggerManager)m_manager.lookup( roleName );
m_disposeManager = true;
} catch (ServiceException e) {
throw new ConfigurationException("Unable to lookup logger manager
with role " + roleName);
}
}
}
public void service(ServiceManager manager)
throws ServiceException
{
m_manager = manager;
}
public void dispose() {
if ( m_disposeManager && null != m_manager)
{
m_manager.release( m_loggermanager );
}
m_manager = null;
m_loggermanager = null;
m_disposeManager = false;
}
}
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