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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.qpid.stac.jmx;
import org.apache.qpid.AMQException;
import org.apache.qpid.management.jmx.JmxConstants;
import org.apache.qpid.stac.commands.CdCommand;
import org.apache.qpid.stac.commands.LsCommand;
import org.apache.log4j.Logger;
import javax.management.MBeanServerConnection;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import javax.management.ObjectInstance;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;
import java.lang.management.ManagementFactory;
import java.util.Hashtable;
import java.util.Set;
public class MBeanServerConnectionContext
{
private static final Logger _log = Logger.getLogger(MBeanServerConnectionContext.class);
/**
* The connection to the MBean server. Can be remote or local, depending on whether we are proxying.
*/
private MBeanServerConnection _connection;
/**
* The connector used to make the connection to the remote MBean server
*/
private JMXConnector _connector;
private CurrentMBean _currentMBean;
/*
* Initialize connection to the Domain Runtime MBean Server
*/
public void connect(String host) throws AMQException
{
if (host == null)
{
_connection = (MBeanServerConnection) ManagementFactory.getPlatformMBeanServer();
}
else
{
String serviceURLString = "service:jmx:local://localhost";
try
{
JMXServiceURL serviceURL = new JMXServiceURL(serviceURLString);
_connector = JMXConnectorFactory.connect(serviceURL, null);
_connection = _connector.getMBeanServerConnection();
}
catch (Exception e)
{
throw new AMQException("Unable to connect to remote MBean server with service url " + serviceURLString +
": " + e, e);
}
}
_currentMBean = new CurrentMBean(_connection);
changeBean(getRootObjectName());
}
/**
* Connect to the local MBean server
* @throws AMQException
*/
public void connect() throws AMQException
{
connect(null);
}
public void disconnect() throws AMQException
{
if (_connection != null)
{
try
{
ObjectName queryName = new ObjectName(JmxConstants.JMX_DOMAIN + ":*");
Set<ObjectInstance> beans = _connection.queryMBeans(queryName, null);
for (ObjectInstance bean : beans)
{
_log.debug("Unregistering MBean: " + bean.getObjectName());
_connection.unregisterMBean(bean.getObjectName());
}
}
catch (Exception e)
{
throw new AMQException("Error unregistering MBeans: " + e, e);
}
}
}
public ObjectName getRootObjectName() throws AMQException
{
Hashtable<String, String> props = new Hashtable<String, String>();
props.put("objectid", "0");
props.put("type", "broker");
try
{
return new ObjectName(JmxConstants.JMX_DOMAIN, props);
}
catch (MalformedObjectNameException e)
{
throw new AMQException("Cannot construct root MBean object name: " + e, e);
}
}
private void changeBean(ObjectName objectName) throws AMQException
{
_currentMBean.changeMBean(objectName);
}
/**
* Change the current bean to the one underneath the current bean, represented by the display name
* @param name
* @throws AMQException
*/
public void changeBean(String name) throws AMQException
{
checkConnection();
if (name.equals("/"))
{
changeBean(getRootObjectName());
}
else
{
ObjectName objName = _currentMBean.getObjectNameByName(name);
if (CurrentMBean.PARENT_ATTRIBUTE.equals(name) && objName == null)
{
// we have tried to change up a level from the root, so just ignore
return;
}
if (objName == null)
{
// could be stale cache, so refresh
_currentMBean.refreshNameToObjectNameMap();
objName = _currentMBean.getObjectNameByName(name);
}
if (objName == null)
{
throw new AMQException("Unknown managed object with name: " + name);
}
else
{
changeBean(objName);
}
}
}
public void ls() throws AMQException
{
checkConnection();
LsCommand.execute(this);
}
public void cd(String destination) throws AMQException
{
CdCommand.execute(this, destination);
}
public void invoke(String methodName, Object... args) throws AMQException
{
_currentMBean.invoke(methodName, args);
}
public CurrentMBean getCurrentMBean()
{
return _currentMBean;
}
public MBeanServerConnection getMBeanServerConnection()
{
return _connection;
}
private void checkConnection() throws NotConnectedException
{
if (_connection == null)
{
throw new NotConnectedException();
}
}
}
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