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KernelProxy.java
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KernelProxy.java
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/**
* Copyright (c) 2002-2016 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.management.impl;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Hashtable;
import java.util.List;
import java.util.NoSuchElementException;
import javax.management.MBeanServerConnection;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectInstance;
import javax.management.ObjectName;
import org.neo4j.jmx.ManagementInterface;
/**
* Does not have any public methods - since the public interface of
* {@link org.neo4j.management.Neo4jManager} should be defined completely in
* that class.
*
* Does not have any (direct or transitive) dependencies on any part of the jmx
* component - since this class is used in
* {@link org.neo4j.management.impl.jconsole.Neo4jPlugin the JConsole plugin},
* and the jmx component is not on the class path in JConsole.
*
* @author Tobias Ivarsson <tobias.ivarsson@neotechnology.com>
*/
public abstract class KernelProxy
{
static final String KERNEL_BEAN_TYPE = "org.neo4j.jmx.Kernel";
protected static final String KERNEL_BEAN_NAME = "Kernel";
static final String MBEAN_QUERY = "MBeanQuery";
protected final MBeanServerConnection server;
protected final ObjectName kernel;
protected KernelProxy( MBeanServerConnection server, ObjectName kernel )
{
String className = null;
try
{
className = server.getMBeanInfo( kernel ).getClassName();
}
catch ( Exception e )
{
// fall through
}
if ( !KERNEL_BEAN_TYPE.equals( className ) )
{
throw new IllegalArgumentException(
"The specified ObjectName does not represent a Neo4j Kernel bean in the specified MBean server." );
}
this.server = server;
this.kernel = kernel;
}
protected List<Object> allBeans()
{
List<Object> beans = new ArrayList<Object>();
Iterable<ObjectInstance> mbeans;
try
{
mbeans = server.queryMBeans( mbeanQuery(), null );
}
catch ( IOException handled )
{
return beans;
}
for ( ObjectInstance instance : mbeans )
{
String className = instance.getClassName();
Class<?> beanType = null;
try
{
if ( className != null ) beanType = Class.forName( className );
}
catch ( Exception ignored )
{
// fall through
}
catch ( LinkageError ignored )
{
// fall through
}
if ( beanType != null )
{
try
{
beans.add( BeanProxy.load( server, beanType, instance.getObjectName() ) );
}
catch ( Exception ignored )
{
// fall through
}
}
}
return beans;
}
private ObjectName assertExists( ObjectName name )
{
try
{
if ( !server.queryNames( name, null ).isEmpty() )
{
return name;
}
}
catch ( IOException handled )
{
// fall through
}
throw new NoSuchElementException( "No MBeans matching " + name );
}
protected <T> T getBean( Class<T> beanInterface )
{
return BeanProxy.load( server, beanInterface, createObjectName( beanInterface ) );
}
protected <T> Collection<T> getBeans( Class<T> beanInterface )
{
return BeanProxy.loadAll( server, beanInterface, createObjectNameQuery( beanInterface ) );
}
private ObjectName createObjectNameQuery( Class<?> beanInterface )
{
return createObjectNameQuery( mbeanQuery(), beanInterface );
}
private ObjectName createObjectName( Class<?> beanInterface )
{
return assertExists( createObjectName( mbeanQuery(), beanInterface ) );
}
protected ObjectName createObjectName( String beanName )
{
return assertExists( createObjectName( mbeanQuery(), beanName, false ) );
}
protected ObjectName mbeanQuery()
{
try
{
return (ObjectName) server.getAttribute( kernel, MBEAN_QUERY );
}
catch ( Exception cause )
{
throw new IllegalStateException( "Could not get MBean query.", cause );
}
}
protected static ObjectName createObjectName( String kernelIdentifier, Class<?> beanInterface )
{
return createObjectName( kernelIdentifier, beanName( beanInterface ) );
}
protected static ObjectName createObjectName( String kernelIdentifier, String beanName, String... extraNaming )
{
Hashtable<String, String> properties = new Hashtable<String, String>();
properties.put( "instance", "kernel#" + kernelIdentifier );
return createObjectName( "org.neo4j", properties, beanName, false, extraNaming );
}
static ObjectName createObjectNameQuery( String kernelIdentifier, String beanName, String... extraNaming )
{
Hashtable<String, String> properties = new Hashtable<String, String>();
properties.put( "instance", "kernel#" + kernelIdentifier );
return createObjectName( "org.neo4j", properties, beanName, true, extraNaming );
}
static ObjectName createObjectName( ObjectName query, Class<?> beanInterface )
{
return createObjectName( query, beanName( beanInterface ), false );
}
static ObjectName createObjectNameQuery( ObjectName query, Class<?> beanInterface )
{
return createObjectName( query, beanName( beanInterface ), true );
}
private static ObjectName createObjectName( ObjectName query, String beanName, boolean isQuery )
{
Hashtable<String, String> properties = new Hashtable<String, String>(query.getKeyPropertyList());
return createObjectName( query.getDomain(), properties, beanName, isQuery );
}
static String beanName( Class<?> beanInterface )
{
if ( beanInterface.isInterface() )
{
ManagementInterface management = beanInterface.getAnnotation( ManagementInterface.class );
if ( management != null )
{
return management.name();
}
}
throw new IllegalArgumentException( beanInterface + " is not a Neo4j Management Been interface" );
}
private static ObjectName createObjectName( String domain, Hashtable<String, String> properties, String beanName,
boolean query, String... extraNaming )
{
properties.put( "name", beanName );
for ( int i = 0; i < extraNaming.length; i++ )
{
properties.put( "name" + i, extraNaming[i] );
}
ObjectName result;
try
{
result = new ObjectName( domain, properties );
if ( query ) result = ObjectName.getInstance( result.toString() + ",*" );
}
catch ( MalformedObjectNameException e )
{
return null;
}
return result;
}
}