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//
// ========================================================================
// Copyright (c) 1995-2013 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.jmx;
import java.io.IOException;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.WeakHashMap;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.atomic.AtomicInteger;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanRegistrationException;
import javax.management.MBeanServer;
import javax.management.ObjectInstance;
import javax.management.ObjectName;
import org.eclipse.jetty.util.component.Container;
import org.eclipse.jetty.util.component.ContainerLifeCycle;
import org.eclipse.jetty.util.component.Dumpable;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/**
* Container class for the MBean instances
*/
public class MBeanContainer implements Container.InheritedListener, Dumpable
{
private final static Logger LOG = Log.getLogger(MBeanContainer.class.getName());
private final static ConcurrentMap __unique = new ConcurrentHashMap();
public static void resetUnique()
{
__unique.clear();
}
private final MBeanServer _mbeanServer;
private final WeakHashMap _beans = new WeakHashMap();
private String _domain = null;
/**
* Lookup an object name by instance
*
* @param object instance for which object name is looked up
* @return object name associated with specified instance, or null if not found
*/
public synchronized ObjectName findMBean(Object object)
{
ObjectName bean = _beans.get(object);
return bean == null ? null : bean;
}
/**
* Lookup an instance by object name
*
* @param oname object name of instance
* @return instance associated with specified object name, or null if not found
*/
public synchronized Object findBean(ObjectName oname)
{
for (Map.Entry entry : _beans.entrySet())
{
ObjectName bean = entry.getValue();
if (bean.equals(oname))
return entry.getKey();
}
return null;
}
/**
* Constructs MBeanContainer
*
* @param server instance of MBeanServer for use by container
*/
public MBeanContainer(MBeanServer server)
{
_mbeanServer = server;
}
/**
* Retrieve instance of MBeanServer used by container
*
* @return instance of MBeanServer
*/
public MBeanServer getMBeanServer()
{
return _mbeanServer;
}
/**
* Set domain to be used to add MBeans
*
* @param domain domain name
*/
public void setDomain(String domain)
{
_domain = domain;
}
/**
* Retrieve domain name used to add MBeans
*
* @return domain name
*/
public String getDomain()
{
return _domain;
}
@Override
public void beanAdded(Container parent, Object obj)
{
LOG.debug("beanAdded {}->{}",parent,obj);
// Is their an object name for the parent
ObjectName pname=null;
if (parent!=null)
{
pname=_beans.get(parent);
if (pname==null)
{
// create the parent bean
beanAdded(null,parent);
pname=_beans.get(parent);
}
}
// Does an mbean already exist?
if (obj == null || _beans.containsKey(obj))
return;
try
{
// Create an MBean for the object
Object mbean = ObjectMBean.mbeanFor(obj);
if (mbean == null)
return;
ObjectName oname = null;
if (mbean instanceof ObjectMBean)
{
((ObjectMBean)mbean).setMBeanContainer(this);
oname = ((ObjectMBean)mbean).getObjectName();
}
//no override mbean object name, so make a generic one
if (oname == null)
{
//if no explicit domain, create one
String domain = _domain;
if (domain == null)
domain = obj.getClass().getPackage().getName();
String type = obj.getClass().getName().toLowerCase(Locale.ENGLISH);
int dot = type.lastIndexOf('.');
if (dot >= 0)
type = type.substring(dot + 1);
StringBuffer buf = new StringBuffer();
String context = (mbean instanceof ObjectMBean)?makeName(((ObjectMBean)mbean).getObjectContextBasis()):null;
if (context==null && pname!=null)
context=pname.getKeyProperty("context");
if (context != null && context.length()>1)
buf.append("context=").append(context).append(",");
buf.append("type=").append(type);
String name = (mbean instanceof ObjectMBean)?makeName(((ObjectMBean)mbean).getObjectNameBasis()):context;
if (name != null && name.length()>1)
buf.append(",").append("name=").append(name);
String basis = buf.toString();
AtomicInteger count = __unique.get(basis);
if (count==null)
{
count=__unique.putIfAbsent(basis,new AtomicInteger());
if (count==null)
count=__unique.get(basis);
}
oname = ObjectName.getInstance(domain + ":" + basis + ",id=" + count.getAndIncrement());
}
ObjectInstance oinstance = _mbeanServer.registerMBean(mbean, oname);
LOG.debug("Registered {}", oinstance.getObjectName());
_beans.put(obj, oinstance.getObjectName());
}
catch (Exception e)
{
LOG.warn("bean: " + obj, e);
}
}
@Override
public void beanRemoved(Container parent, Object obj)
{
LOG.debug("beanRemoved {}",obj);
ObjectName bean = _beans.remove(obj);
if (bean != null)
{
try
{
_mbeanServer.unregisterMBean(bean);
LOG.debug("Unregistered {}", bean);
}
catch (javax.management.InstanceNotFoundException e)
{
LOG.ignore(e);
}
catch (Exception e)
{
LOG.warn(e);
}
}
}
/**
* @param basis name to strip of special characters.
* @return normalized name
*/
public String makeName(String basis)
{
if (basis==null)
return basis;
return basis.replace(':', '_').replace('*', '_').replace('?', '_').replace('=', '_').replace(',', '_').replace(' ', '_');
}
@Override
public void dump(Appendable out, String indent) throws IOException
{
ContainerLifeCycle.dumpObject(out,this);
ContainerLifeCycle.dump(out, indent, _beans.entrySet());
}
@Override
public String dump()
{
return ContainerLifeCycle.dump(this);
}
public void destroy()
{
for (ObjectName oname : _beans.values())
if (oname!=null)
{
try
{
_mbeanServer.unregisterMBean(oname);
}
catch (MBeanRegistrationException | InstanceNotFoundException e)
{
LOG.warn(e);
}
}
}
}
