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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.cassandra.auth;
import java.lang.management.ManagementFactory;
import java.util.Set;
import javax.management.MBeanServer;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import com.google.common.base.Objects;
import com.google.common.collect.Sets;
import org.apache.commons.lang3.StringUtils;
public class JMXResource implements IResource
{
enum Level
{
ROOT, MBEAN
}
private static final String ROOT_NAME = "mbean";
private static final JMXResource ROOT_RESOURCE = new JMXResource();
private final Level level;
private final String name;
// permissions which may be granted on Mbeans
private static final Set JMX_PERMISSIONS = Sets.immutableEnumSet(Permission.AUTHORIZE,
Permission.DESCRIBE,
Permission.EXECUTE,
Permission.MODIFY,
Permission.SELECT);
private JMXResource()
{
level = Level.ROOT;
name = null;
}
private JMXResource(String name)
{
this.name = name;
level = Level.MBEAN;
}
public static JMXResource mbean(String name)
{
return new JMXResource(name);
}
/**
* Parses a role resource name into a RoleResource instance.
*
* @param name Name of the data resource.
* @return RoleResource instance matching the name.
*/
public static JMXResource fromName(String name)
{
String[] parts = StringUtils.split(name, '/');
if (!parts[0].equals(ROOT_NAME) || parts.length > 2)
throw new IllegalArgumentException(String.format("%s is not a valid JMX resource name", name));
if (parts.length == 1)
return root();
return mbean(parts[1]);
}
@Override
public String getName()
{
if (level == Level.ROOT)
return ROOT_NAME;
else if (level == Level.MBEAN)
return String.format("%s/%s", ROOT_NAME, name);
throw new AssertionError();
}
/**
* @return for a non-root resource, return the short form of the resource name which represents an ObjectName
* (which may be of the pattern or exact kind). i.e. not the full "root/name" version returned by getName().
* Throws IllegalStateException if called on the root-level resource.
*/
public String getObjectName()
{
if (level == Level.ROOT)
throw new IllegalStateException(String.format("%s JMX resource has no object name", level));
return name;
}
/**
* @return the root-level resource.
*/
public static JMXResource root()
{
return ROOT_RESOURCE;
}
@Override
public IResource getParent()
{
if (level == Level.MBEAN)
return root();
throw new IllegalStateException("Root-level resource can't have a parent");
}
/**
* @return Whether or not the resource has a parent in the hierarchy.
*/
@Override
public boolean hasParent()
{
return !level.equals(Level.ROOT);
}
@Override
public boolean exists()
{
if (!hasParent())
return true;
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
try
{
return !(mbs.queryNames(new ObjectName(name), null).isEmpty());
}
catch (MalformedObjectNameException e)
{
return false;
}
catch (NullPointerException e)
{
return false;
}
}
@Override
public Set applicablePermissions()
{
return JMX_PERMISSIONS;
}
@Override
public String toString()
{
return level == Level.ROOT ? "" : String.format("", name);
}
@Override
public boolean equals(Object o)
{
if (this == o)
return true;
if (!(o instanceof JMXResource))
return false;
JMXResource j = (JMXResource) o;
return Objects.equal(level, j.level) && Objects.equal(name, j.name);
}
@Override
public int hashCode()
{
return Objects.hashCode(level, name);
}
}