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package com.sun.enterprise.management.support;
import java.util.Set;
import java.util.HashSet;
import java.util.List;
import java.util.LinkedList;
import java.util.Map;
import java.util.HashMap;
import java.util.Collections;
import java.io.Serializable;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import javax.management.Notification;
import javax.management.MBeanServerNotification;
import javax.management.NotificationListener;
import javax.management.NotificationFilter;
import javax.management.NotificationFilterSupport;
import javax.management.ListenerNotFoundException;
import javax.management.InstanceNotFoundException;
import javax.management.NotificationEmitter;
import javax.management.MBeanNotificationInfo;
import com.sun.appserv.management.base.NotificationService;
import com.sun.appserv.management.base.XTypes;
import com.sun.appserv.management.base.AMX;
import com.sun.appserv.management.util.misc.GSetUtil;
import com.sun.appserv.management.util.misc.OverflowHandler;
import com.sun.appserv.management.util.jmx.JMXUtil;
import com.sun.appserv.management.util.jmx.NotificationBuilder;
/**
*/
public final class NotificationServiceImpl extends AMXImplBase
implements NotificationListener, NotificationEmitter
{
private Map<ObjectName,NotificationFilter> mListenees;
private final Object mUserData;
private final Map<ObjectName,NotificationFilter> mIncludePatterns;
private final Map<ObjectName,NotificationFilter> mExcludePatterns;
private final Map<Object,NotificationBuffer> mBuffers;
public
NotificationServiceImpl(
final Object userData,
final int bufferSize )
{
if ( userData == null || !(userData instanceof Serializable) )
{
throw new IllegalArgumentException();
}
mUserData = userData;
mListenees = Collections.synchronizedMap( new HashMap<ObjectName,NotificationFilter>() );
mBuffers = Collections.synchronizedMap( new HashMap<Object,NotificationBuffer>() );
mIncludePatterns = new HashMap<ObjectName,NotificationFilter>();
mExcludePatterns = new HashMap<ObjectName,NotificationFilter>();
}
public final Object
getUserData()
{
return( mUserData );
}
private final String[] NOTIF_TYPES = new String[]
{
NotificationService.BUFFER_OVERFLOW_NOTIFICATION_TYPE,
};
public MBeanNotificationInfo[]
getNotificationInfo()
{
final MBeanNotificationInfo info = new MBeanNotificationInfo(
NOTIF_TYPES,
Notification.class.getName(),
"" );
final MBeanNotificationInfo[] selfInfos = new MBeanNotificationInfo[] { info };
return( JMXUtil.mergeMBeanNotificationInfos( super.getNotificationInfo(), selfInfos ) );
}
/**
*/
protected void
issueBufferOverflowNotification( final Notification oldNotif )
{
if ( shouldEmitNotifications() )
{
sendNotification( NotificationService.BUFFER_OVERFLOW_NOTIFICATION_TYPE,
NotificationService.OVERFLOWED_NOTIFICATION_KEY,
oldNotif );
}
}
public void
handleNotification(
final Notification notif,
final Object handback)
{
synchronized( mBuffers )
{
for( final Object id : mBuffers.keySet() )
{
getBuffer( id ).bufferNotification( notif );
}
}
// let all listeners know...
sendNotification( notif );
}
private NotificationBuffer
getBuffer( final Object bufferID )
{
return( (NotificationBuffer)mBuffers.get( bufferID ) );
}
private final class OverflowHandlerImpl implements OverflowHandler
{
public OverflowHandlerImpl() {}
public void
handleBufferOverflow( Object o )
{
final Notification notif = (Notification)o;
issueBufferOverflowNotification( notif );
}
}
private static int sBufferID = 0;
public Object
createBuffer(
final int bufferSize,
final NotificationFilter filter )
{
final OverflowHandler handler = new OverflowHandlerImpl();
final NotificationBuffer buffer =
new NotificationBuffer( bufferSize, filter, handler );
Object id = null;
synchronized( mBuffers )
{
++sBufferID;
id = "" + sBufferID;
mBuffers.put( id, buffer );
}
return( id );
}
public void
removeBuffer( final Object bufferID )
{
final NotificationBuffer buffer =
(NotificationBuffer)mBuffers.remove( bufferID );
}
public Map
getBufferNotifications(
final Object bufferID,
final long sequenceNumberIn )
{
final NotificationBuffer buffer = getBuffer( bufferID );
return( buffer.getNotifications( sequenceNumberIn ) );
}
public String
getGroup()
{
return( AMX.GROUP_UTILITY );
}
protected Set<ObjectName>
getMatchingObjectNames( final ObjectName pattern )
{
Set<ObjectName> s = null;
if ( pattern.isPattern() )
{
s = JMXUtil.queryNames( getMBeanServer(), pattern, null );
}
else
{
s = GSetUtil.newSingletonSet( pattern );
}
return( s );
}
protected void
listenToIfMatch( final ObjectName objectName )
{
if ( ! mListenees.keySet().contains( objectName ) )
{
final String defaultDomain = getMBeanServer().getDefaultDomain();
for( final ObjectName pattern : mIncludePatterns.keySet() )
{
if ( JMXUtil.matchesPattern( defaultDomain, pattern, objectName ) )
{
final NotificationFilter filter =
(NotificationFilter)mIncludePatterns.get( pattern );
listenToSingle( objectName, filter );
}
}
}
}
protected void
listenToSingle(
final ObjectName objectName,
final NotificationFilter filter )
{
mListenees.put( objectName, filter );
try
{
getMBeanServer().addNotificationListener( objectName, this, filter, null );
}
catch( Exception e )
{
mListenees.remove( objectName );
}
}
public void
listenTo(
final ObjectName pattern,
final NotificationFilter filter )
throws InstanceNotFoundException
{
mIncludePatterns.put( pattern, filter );
final Set<ObjectName> listenees = getMatchingObjectNames( pattern );
final MBeanServer server = getMBeanServer();
for( final ObjectName objectName : listenees )
{
if ( objectName.equals( getObjectName() ) )
{
continue;
}
listenToSingle( objectName, filter );
}
}
private void
checkListeningTo( final ObjectName objectName )
{
if ( ! mListenees.containsKey( objectName ) )
{
throw new IllegalArgumentException( objectName.toString() );
}
}
public void
dontListenTo( final ObjectName pattern )
{
mIncludePatterns.remove( pattern );
final Set<ObjectName> listenees = getMatchingObjectNames( pattern );
final MBeanServer server = getMBeanServer();
for( final ObjectName objectName : listenees )
{
try
{
server.removeNotificationListener( objectName, this );
mListenees.remove( objectName );
}
catch( ListenerNotFoundException e )
{
}
catch( InstanceNotFoundException e )
{
}
}
}
public Set<ObjectName>
getListeneeObjectNameSet()
{
final Set<ObjectName> objectNames = new HashSet<ObjectName>();
synchronized( mListenees )
{
objectNames.addAll( mListenees.keySet() );
}
return( objectNames );
}
private NotificationFilter
_getFilter( final ObjectName objectName)
{
final NotificationFilter filter =
(NotificationFilter)mListenees.get( objectName );
return( filter );
}
public NotificationFilter
getFilter( final ObjectName objectName)
{
checkListeningTo( objectName );
return( _getFilter( objectName ) );
}
// tracks coming and going of MBeans being listened to which
// match our patterns...
private final class RegistrationListener implements NotificationListener
{
public RegistrationListener() {}
public void
handleNotification(
final Notification notifIn,
final Object handback)
{
if ( notifIn instanceof MBeanServerNotification )
{
final MBeanServerNotification notif = (MBeanServerNotification)notifIn;
final ObjectName objectName = notif.getMBeanName();
final String type = notif.getType();
if ( type.equals( MBeanServerNotification.REGISTRATION_NOTIFICATION ) )
{
listenToIfMatch( objectName );
}
else if ( type.equals( MBeanServerNotification.UNREGISTRATION_NOTIFICATION ) )
{
dontListenTo( objectName );
}
}
}
}
protected void
preRegisterDone()
throws Exception
{
super.preRegisterDone();
// it's crucial we listen for registration/unregistration events
// so that any patterns are maintained.
JMXUtil.listenToMBeanServerDelegate( getMBeanServer(),
new RegistrationListener(), null, null );
}
public void
preDeregisterHook()
{
super.preDeregisterHook();
synchronized( mListenees )
{
final Set<ObjectName> s = getListeneeObjectNameSet();
final ObjectName[] objectNames = new ObjectName[ s.size() ];
s.toArray( objectNames );
for( int i = 0; i < objectNames.length; ++i )
{
dontListenTo( objectNames[ i ] );
}
}
synchronized( mBuffers )
{
for( final NotificationBuffer buffer : mBuffers.values() )
{
removeBuffer( buffer );
}
}
}
}
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