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/*
*
* Copyright (c) 2006 The Apache Software Foundation
*
* Licensed 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 javax.management.*;
import java.text.SimpleDateFormat;
import java.util.*;
/**
* Stores information about the "current" MBean. This data is used when navigating the hierarchy.
*
* For example, we need to map between a name and an object id, and this stores that link.
*
*/
public class CurrentMBean
{
private MBeanServerConnection _mbeanServerConnection;
public static final String PARENT_ATTRIBUTE = "__parent";
private static final SimpleDateFormat _dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
/**
* Maps names to ObjectNames. Used for efficiency to avoid iterating through all names when doing a CD command.
*/
private Map<String, ObjectName> _name2ObjectNameMap = new HashMap<String, ObjectName>();
private ObjectName _mbeanObjectName;
private MBeanInfo _mbeanInfo;
public CurrentMBean(MBeanServerConnection mbeanServerConnection)
{
_mbeanServerConnection = mbeanServerConnection;
}
public void changeMBean(ObjectName objectName) throws AMQException
{
try
{
_mbeanInfo = _mbeanServerConnection.getMBeanInfo(objectName);
}
catch (Exception e)
{
throw new AMQException("Unable to look up MBean for object name " + objectName + ": " + e, e);
}
_mbeanObjectName = objectName;
}
public ObjectName getMBeanObjectName()
{
return _mbeanObjectName;
}
public MBeanInfo getMBeanInfo()
{
return _mbeanInfo;
}
public Object getAttributeValue(String name, String type) throws AMQException
{
// TODO: The type argument is a temporary workaround for a bug (somewhere!) in which
// a date is returned as a String
try
{
Object o = _mbeanServerConnection.getAttribute(_mbeanObjectName, name);
if ("java.util.Date".equals(type))
{
return _dateFormat.format(new Date(Long.parseLong((String)o)));
}
else
{
return o;
}
}
catch (Exception e)
{
throw new AMQException("Unable to read attribute value for attribute name " + name, e);
}
}
/**
* Get the objects (i.e. "directories") under the current mbean, ordered alphabetically. This method also
* refreshes the cache that maps from name to ObjectName (this saves iterating through the attributes again).
* @return a set containing the attribute infos, sorted by name
*/
public SortedSet<MBeanAttributeInfo> getOrderedObjects() throws AMQException
{
TreeSet<MBeanAttributeInfo> attributes = new TreeSet<MBeanAttributeInfo>(new MBeanAttributeInfoComparator());
_name2ObjectNameMap.clear();
for (MBeanAttributeInfo ai : _mbeanInfo.getAttributes())
{
String type = ai.getType();
if ("javax.management.ObjectName".equals(type))
{
_name2ObjectNameMap.put(ai.getName(), (ObjectName)getAttributeValue(ai.getName(), type));
attributes.add(ai);
}
}
return attributes;
}
public void refreshNameToObjectNameMap() throws AMQException
{
_name2ObjectNameMap.clear();
for (MBeanAttributeInfo ai : _mbeanInfo.getAttributes())
{
final String type = ai.getType();
if ("javax.management.ObjectName".equals(type))
{
_name2ObjectNameMap.put(ai.getName(), (ObjectName)getAttributeValue(ai.getName(), type));
}
}
}
/**
* Gets an object name, given the "display name"
* @param name the display name (usually returned to the user when he does an ls()
* @return the object name
*/
public ObjectName getObjectNameByName(String name)
{
return _name2ObjectNameMap.get(name);
}
public SortedSet<MBeanAttributeInfo> getOrderedAttributes()
{
TreeSet<MBeanAttributeInfo> attributes = new TreeSet<MBeanAttributeInfo>(new MBeanAttributeInfoComparator());
for (MBeanAttributeInfo ai : _mbeanInfo.getAttributes())
{
String type = ai.getType();
if (!"javax.management.ObjectName".equals(type))
{
attributes.add(ai);
}
}
return attributes;
}
public SortedSet<MBeanOperationInfo> getOrderedOperations()
{
TreeSet<MBeanOperationInfo> operations = new TreeSet<MBeanOperationInfo>(new MBeanOperationInfoComparator());
for (MBeanOperationInfo oi : _mbeanInfo.getOperations())
{
operations.add(oi);
}
return operations;
}
public void invoke(String methodName, Object... args) throws AMQException
{
try
{
_mbeanServerConnection.invoke(_mbeanObjectName, methodName, null, null);
}
catch (Exception e)
{
throw new AMQException("Error invoking method " + methodName + ": " + e, e);
}
}
}
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