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/*
* Copyright 2004-2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
package com.sun.enterprise.management.support;
import com.sun.appserv.management.util.jmx.NotificationListenerBase;
import com.sun.enterprise.management.ext.lb.LoadBalancerImpl;
import java.util.Map;
import java.util.HashMap;
import java.util.Set;
import java.util.HashSet;
import java.util.Collections;
import java.io.IOException;
import javax.management.AttributeChangeNotification;
import javax.management.InstanceNotFoundException;
import javax.management.JMException;
import javax.management.MBeanServer;
import javax.management.Notification;
import javax.management.ObjectName;
import com.sun.appserv.management.DomainRoot;
import com.sun.appserv.management.base.AMXDebug;
import com.sun.appserv.management.base.AMX;
import com.sun.appserv.management.base.Util;
import com.sun.appserv.management.base.AMXRootLogger;
import static com.sun.appserv.management.base.XTypes.LOAD_BALANCER_CONFIG;
import static com.sun.appserv.management.base.XTypes.LOAD_BALANCER;
import static com.sun.appserv.management.base.AMX.JMX_DOMAIN;
import com.sun.appserv.management.client.ProxyFactory;
import com.sun.appserv.management.config.LoadBalancerConfig;
import com.sun.appserv.management.ext.lb.LoadBalancer;
import com.sun.appserv.management.util.jmx.MBeanRegistrationListener;
/**
This class is complicated by out-of-order registration of MBeans.
Because LoadBalancerImpl depends on LBConfig, and they might be registered
out of order, special care must be taken at startup.
*/
public class LoadBalancerSupport {
//private final DomainRoot mDomainRoot;
private final MBeanServer mMBeanServer;
private final DomainRoot mDomainRoot;
private final Map<ObjectName,ObjectName> mConfigToLoadBalancers;
private final LoadBalancerConfigListener mConfigListener;
private LoadBalancerSupport(
final DomainRoot domainRoot,
final MBeanServer mbeanServer)
throws InstanceNotFoundException, IOException {
// mDomainRoot = domainRoot;
mMBeanServer = mbeanServer;
mDomainRoot = domainRoot;
mConfigToLoadBalancers =
Collections.synchronizedMap(new HashMap<ObjectName,ObjectName>());
mConfigListener = new LoadBalancerConfigListener( mMBeanServer );
}
private static volatile LoadBalancerSupport INSTANCE = null;
/**
Call once and only once.
*/
public static synchronized LoadBalancerSupport
start(
final ObjectName domainRootObjectName,
final MBeanServer server ) throws InstanceNotFoundException, IOException
{
if ( INSTANCE != null )
{
throw new IllegalStateException();
}
final DomainRoot domainRoot =
ProxyFactory.getInstance( server ).getProxy( domainRootObjectName, DomainRoot.class );
INSTANCE = new LoadBalancerSupport( domainRoot, server );
INSTANCE.mConfigListener.startListening();
//final InitialRegistrationListener initial = new InitialRegistrationListener();
//initial.startListening();
return INSTANCE;
}
/**
Listens for registration and unregistration of LOAD_BALANCER_CONFIG
MBeans, dynamically creating or removing corresponding LOAD_BALANCER
MBeans.
*/
private final class LoadBalancerConfigListener
extends MBeanRegistrationListener
{
private final MBeanServer mServer;
LoadBalancerConfigListener( final MBeanServer mbeanServer )
throws InstanceNotFoundException, IOException
{
super( "LoadBalancerSupport.LoadBalancerConfigListener",
mbeanServer, null );
mServer = mbeanServer;
}
private boolean isLoadBalancerConfig( final ObjectName o )
{
return LOAD_BALANCER_CONFIG.equals( Util.getJ2EEType(o) );
}
protected void mbeanRegistered( final ObjectName registeredObjectName )
{
if ( isLoadBalancerConfig( registeredObjectName ) )
{
registerNewLoadBalancer( registeredObjectName );
}
}
protected void mbeanUnregistered( final ObjectName unregisteredObjectName )
{
if ( isLoadBalancerConfig( unregisteredObjectName ) )
{
unregisterLoadBalancer( unregisteredObjectName );
}
}
};
/**
Register a {@link LoadBalancer} MBean corresponding to
a newly-registered LoadBalancerConfig MBean. See {@link #unregisterLoadBalancer}.
*/
synchronized LoadBalancer
registerNewLoadBalancer(final ObjectName loadBalancerConfigObjectName)
{
//create load balancer runtime mbean
final ObjectName domainRootObjName = Util.getObjectName( mDomainRoot );
final ObjectNames objectNames = ObjectNames.getInstance(JMX_DOMAIN);
final String name = loadBalancerConfigObjectName.getKeyProperty( AMX.NAME_KEY );
final ObjectName loadBalancerObjName =
objectNames.buildContaineeObjectName( domainRootObjName,
mDomainRoot.getFullType(), LOAD_BALANCER, name);
final LoadBalancerConfig loadBalancerConfig =
getProxy( loadBalancerConfigObjectName, LoadBalancerConfig.class);
final LoadBalancerImpl loadBalancerImpl =
new LoadBalancerImpl(mMBeanServer, loadBalancerConfig);
LoadBalancer loadBalancerProxy = null;
try
{
final ObjectName actualObjectName = mMBeanServer.registerMBean(
loadBalancerImpl, loadBalancerObjName).getObjectName();
loadBalancerProxy = getProxy( actualObjectName, LoadBalancer.class);
mConfigToLoadBalancers.put( loadBalancerConfigObjectName, actualObjectName );
}
catch( JMException ex )
{
logWarning(
"LoadBalancerRegistrationListener registerLoadBalancer " +
"failed. Exception = ", ex);
}
return loadBalancerProxy;
}
/**
'synchronized' to avoid any register/unregister conditions with rapid
registration/unregistration using the same name.
*/
synchronized void
unregisterLoadBalancer(final ObjectName unregisteredLoadBalancerConfig)
{
final ObjectName correspondingLoadBalancerObjectName =
mConfigToLoadBalancers.remove( unregisteredLoadBalancerConfig );
if ( correspondingLoadBalancerObjectName != null )
{
try
{
mMBeanServer.unregisterMBean( correspondingLoadBalancerObjectName );
}
catch( JMException e )
{
// shouldn't happen, but not a problem
}
}
}
protected ProxyFactory
getProxyFactory()
{
return ProxyFactory.getInstance( mMBeanServer );
}
protected <T extends AMX> T
getProxy( final ObjectName objectName, final Class<T> theClass)
{
return getProxyFactory().getProxy( objectName, theClass );
}
protected void logWarning(String prefix, Exception ex) {
AMXRootLogger.getInstance().warning(prefix + " : " + ex.getMessage());
}
/**
private synchronized void
amxNowReady()
{
// start listening for new registrations *before*
INSTANCE.startListening();
mAMXReady = true;
//get ALL AMX <load-balancer> mbeans in the domain
final Map<String, LoadBalancerConfig> loadBalancerConfigMap =
mDomainRoot.getDomainConfig().getLoadBalancerConfigMap();
for (final LoadBalancerConfig lbc : loadBalancerConfigMap.values())
{
registerNewLoadBalancer( Util.getObjectName( lbc ) );
}
}
*/
/**
Listen for AMX to be ready, and when ready,
private final InitialRegistrationListener extends NotificationListenerBase
{
InitialRegistrationListener()
{
super( "LoadBalancerSupport.InitialRegistrationListener",
mServer, Util.getObjectName( mDomainRoot ) );
}
public void handleNotification(
final Notification notifIn,
final Object handback)
{
if ( DomainRoot.AMX_READY_NOTIFICATION_TYPE.equals(notifIn.getType()) )
{
amxNowReady();
cleanup(); // stops listening
}
} catch (Exception ex) {
AMXRootLogger.getInstance().warning(
"LBBootstrapUtil:handleNotification" + " : " + ex.getMessage());
}
}
};
*/
}
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