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BeanProxy.java
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BeanProxy.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.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.LinkedList;
import javax.management.MBeanServerConnection;
import javax.management.MBeanServerInvocationHandler;
import javax.management.ObjectName;
abstract class BeanProxy
{
final boolean supportsMxBeans;
private BeanProxy( boolean supportsMxBeans )
{
this.supportsMxBeans = supportsMxBeans;
}
public static <T> T load( MBeanServerConnection mbs, Class<T> beanInterface, ObjectName name )
{
return factory.makeProxy( mbs, beanInterface, name );
}
public static <T> Collection<T> loadAll( MBeanServerConnection mbs, Class<T> beanInterface, ObjectName query )
{
Collection<T> beans = new LinkedList<T>();
try
{
for ( ObjectName name : mbs.queryNames( query, null ) )
{
beans.add( factory.makeProxy( mbs, beanInterface, name ) );
}
}
catch ( IOException e )
{
// fall through and return the empty collection...
}
return beans;
}
static boolean supportsMxBeans()
{
return factory != null && factory.supportsMxBeans;
}
abstract <T> T makeProxy( MBeanServerConnection mbs, Class<T> beanInterface, ObjectName name );
private static final BeanProxy factory;
static
{
BeanProxy proxyMaker;
try
{
proxyMaker = new Java6ProxyMaker();
}
catch ( Exception t )
{
proxyMaker = null;
}
catch ( LinkageError t )
{
proxyMaker = null;
}
if ( proxyMaker == null )
{
try
{
proxyMaker = new Java5ProxyMaker();
}
catch ( Exception t )
{
proxyMaker = null;
}
catch ( LinkageError t )
{
proxyMaker = null;
}
}
factory = proxyMaker;
}
private static class Java6ProxyMaker extends BeanProxy
{
private final Method newMXBeanProxy;
Java6ProxyMaker() throws Exception
{
super( true );
Class<?> JMX = Class.forName( "javax.management.JMX" );
this.newMXBeanProxy = JMX.getMethod( "newMXBeanProxy", MBeanServerConnection.class,
ObjectName.class, Class.class );
}
@Override
<T> T makeProxy( MBeanServerConnection mbs, Class<T> beanType, ObjectName name )
{
try
{
return beanType.cast( newMXBeanProxy.invoke( null, mbs, name, beanType ) );
}
catch ( InvocationTargetException exception )
{
throw launderRuntimeException( exception.getTargetException() );
}
catch ( Exception exception )
{
throw new UnsupportedOperationException(
"Creating Management Bean proxies requires Java 1.6", exception );
}
}
static RuntimeException launderRuntimeException( Throwable exception )
{
if ( exception instanceof RuntimeException )
{
return (RuntimeException) exception;
}
else if ( exception instanceof Error )
{
throw (Error) exception;
}
else
{
throw new RuntimeException( "Unexpected Exception!", exception );
}
}
}
private static class Java5ProxyMaker extends BeanProxy
{
Java5ProxyMaker() throws Exception
{
super( false );
Class.forName( "javax.management.MBeanServerInvocationHandler" );
}
@Override
<T> T makeProxy( MBeanServerConnection mbs, Class<T> beanType, ObjectName name )
{
return MBeanServerInvocationHandler.newProxyInstance( mbs, name, beanType, false );
}
}
}