org.eclipse.jetty.server.handler.ManagedAttributeListener Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//
package org.eclipse.jetty.server.handler;
import java.util.HashSet;
import java.util.Set;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Enable Jetty style JMX MBeans from within a Context
*/
public class ManagedAttributeListener
{
private static final Logger LOG = LoggerFactory.getLogger(ManagedAttributeListener.class);
final Set _managedAttributes = new HashSet<>();
final ContextHandler _context;
public ManagedAttributeListener(ContextHandler context, String... managedAttributes)
{
_context = context;
for (String attr : managedAttributes)
{
_managedAttributes.add(attr);
}
if (LOG.isDebugEnabled())
LOG.debug("managedAttributes {}", _managedAttributes);
}
/* TODO
@Override
public void attributeReplaced(ServletContextAttributeEvent event)
{
if (_managedAttributes.contains(event.getName()))
updateBean(event.getName(), event.getValue(), event.getServletContext().getAttribute(event.getName()));
}
@Override
public void attributeRemoved(ServletContextAttributeEvent event)
{
if (_managedAttributes.contains(event.getName()))
updateBean(event.getName(), event.getValue(), null);
}
@Override
public void attributeAdded(ServletContextAttributeEvent event)
{
if (_managedAttributes.contains(event.getName()))
updateBean(event.getName(), null, event.getValue());
}
@Override
public void contextInitialized(ServletContextEvent event)
{
// Update existing attributes
for (String name : _context.getServletContext().getAttributeNameSet())
{
if (_managedAttributes.contains(name))
updateBean(name, null, event.getServletContext().getAttribute(name));
}
}
@Override
public void contextDestroyed(ServletContextEvent event)
{
for (String name : _context.getServletContext().getAttributeNameSet())
{
if (_managedAttributes.contains(name))
updateBean(name, event.getServletContext().getAttribute(name), null);
}
}
protected void updateBean(String name, Object oldBean, Object newBean)
{
if (LOG.isDebugEnabled())
LOG.debug("update {} {}->{} on {}", name, oldBean, newBean, _context);
_context.updateBean(oldBean, newBean, false);
}
*/
}