org.eclipse.jetty.jmx.MBeanContainer Maven / Gradle / Ivy

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//
//  ========================================================================
//  Copyright (c) 1995-2012 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.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.WeakHashMap;

import javax.management.MBeanServer;
import javax.management.ObjectInstance;
import javax.management.ObjectName;

import org.eclipse.jetty.util.component.AbstractLifeCycle;
import org.eclipse.jetty.util.component.AggregateLifeCycle;
import org.eclipse.jetty.util.component.Container;
import org.eclipse.jetty.util.component.Container.Relationship;
import org.eclipse.jetty.util.component.Dumpable;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.util.log.StdErrLog;
import org.eclipse.jetty.util.thread.ShutdownThread;

/**
 * Container class for the MBean instances
 */
public class MBeanContainer extends AbstractLifeCycle implements Container.Listener, Dumpable
{
    private final static Logger LOG = Log.getLogger(MBeanContainer.class.getName());
    
    private final MBeanServer _server;
    private final WeakHashMap _beans = new WeakHashMap();
    private final HashMap _unique = new HashMap();
    private final WeakHashMap> _relations = 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)
    {
        _server = server;
    }

    /**
     * Retrieve instance of MBeanServer used by container
     *
     * @return instance of MBeanServer
     */
    public MBeanServer getMBeanServer()
    {
        return _server;
    }

    /**
     * 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;
    }

    /**
     * Implementation of Container.Listener interface
     *
     * @see org.eclipse.jetty.util.component.Container.Listener#add(org.eclipse.jetty.util.component.Container.Relationship)
     */
    public synchronized void add(Relationship relationship)
    {
        LOG.debug("add {}",relationship);
        ObjectName parent = _beans.get(relationship.getParent());
        if (parent == null)
        {
            addBean(relationship.getParent());
            parent = _beans.get(relationship.getParent());
        }

        ObjectName child = _beans.get(relationship.getChild());
        if (child == null)
        {
            addBean(relationship.getChild());
            child = _beans.get(relationship.getChild());
        }

        if (parent != null && child != null)
        {
            List rels = _relations.get(parent);
            if (rels==null)
            {
                rels=new ArrayList();
                _relations.put(parent,rels);
            }
            rels.add(relationship);
        }
    }

    /**
     * Implementation of Container.Listener interface
     *
     * @see org.eclipse.jetty.util.component.Container.Listener#remove(org.eclipse.jetty.util.component.Container.Relationship)
     */
    public synchronized void remove(Relationship relationship)
    {
        LOG.debug("remove {}",relationship);
        ObjectName parent = _beans.get(relationship.getParent());
        ObjectName child = _beans.get(relationship.getChild());

        if (parent != null && child != null)
        {
            List rels = _relations.get(parent);
            if (rels!=null)
            {
                for (Iterator i=rels.iterator();i.hasNext();)
                {
                    Container.Relationship r = i.next();
                    if (relationship.equals(r) || r.getChild()==null)
                        i.remove();
                }
            }
        }
    }

    /**
     * Implementation of Container.Listener interface
     *
     * @see org.eclipse.jetty.util.component.Container.Listener#removeBean(java.lang.Object)
     */
    public synchronized void removeBean(Object obj)
    {
        LOG.debug("removeBean {}",obj);
        ObjectName bean = _beans.remove(obj);

        if (bean != null)
        {
            List beanRelations= _relations.remove(bean);
            if (beanRelations != null)
            {
                LOG.debug("Unregister {}", beanRelations);
                List removeList = new ArrayList