Examples of com.sun.appserv.management.base.NotificationService

com.sun.appserv.management.base.NotificationService
Provides enhanced abilities for working with Notifications. Listens to other MBeans (as configured) and collects the Notifications which can later be retrieved by calling takeNotifications(). The listening is quite powerful; both "listen to" and "don't listen to" ObjectNames or ObjectName patterns may be specified, and are dynamically maintained.
All received Notifications are resent to all listeners on this MBean. This makes it possible to listen to a single MBean for all "interesting" Notifications across many different MBeans, even if these MBeans are dynamically registered and unregistered.
Buffering is also available, via a named buffer facility. Creation of a buffer together with an optional filter allows a caller to buffer Notifications of interest which can later be retrieved as a batch. This facility may be of particular use for clients which disconnect and reconnect.
When a buffer overflows, a notification of type BUFFER_OVERFLOW_NOTIFICATION_TYPE is emitted


    public void
  testCreate()
    throws Exception
  {
    final NotificationService  proxy  = create();
    
    removeNotificationService( proxy );
  }

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    public void
  testGetFromEmpty()
    throws Exception
  {
    final NotificationService  proxy  = create();
    
    assert( proxy.getListeneeSet().size() == 0 );
    final Object  id  = proxy.createBuffer( 10, null);
    final Map<String,Object>  result  = proxy.getBufferNotifications( id, 0 );
    final Notification[]  notifs  = (Notification[])result.get( proxy.NOTIFICATIONS_KEY );
    assertEquals( 0, notifs.length );
  }

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    public void
  testListen()
    throws Exception
  {
    final NotificationService  proxy  = create();
  
    final QueryMgr  queryMgr  = getQueryMgr();
    final ObjectName  objectName  = Util.getObjectName( queryMgr );
    
    final Object  id  = proxy.createBuffer( 10, null);
    final NotificationServiceHelper  helper  = new NotificationServiceHelper( proxy, id);
    proxy.listenTo( objectName, null );
    assert( proxy.getListeneeSet().size() == 1 );
    assert( Util.getObjectName( (Util.asAMX(proxy.getListeneeSet().iterator().next())) ).equals( objectName ) );
    
    final MyListener  myListener  = new MyListener();
    proxy.addNotificationListener( myListener, null, null );
     
    final Level  saveLevel = queryMgr.getMBeanLogLevel();
    queryMgr.setMBeanLogLevel( Level.INFO );
    queryMgr.setMBeanLogLevel( saveLevel );
    
    // delivery may be asynchronous; wait until done
    while ( myListener.getCount() < 2 )
    {
      sleep( 20 );
    }
    assert( myListener.getCount() == 2 );
    
    Notification[]  notifs  = helper.getNotifications();
    
    assertEquals( 2, notifs.length );
    assert( notifs[ 0 ].getType().equals( AttributeChangeNotification.ATTRIBUTE_CHANGE ) );
    assert( notifs[ 1 ].getType().equals( AttributeChangeNotification.ATTRIBUTE_CHANGE ) );
    notifs  = helper.getNotifications();
    assert( notifs.length == 0 );
    
    
    proxy.dontListenTo( objectName );
    assert( proxy.getListeneeSet().size() == 0 );
    
    removeNotificationService( proxy );
  }

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  {
    // use the NotificationServiceMgr as a convenient way of making
    // an MBean (a NotificationService) come and go.
    final NotificationServiceMgr  mgr  = getDomainRoot().getNotificationServiceMgr();
    
    final NotificationService  ns  = mgr.createNotificationService( "UserData", 10 );
    assert( ns.getUserData().equals( "UserData" ) );
    final ObjectName  nsObjectName  = Util.getObjectName( ns );
    
    mgr.removeNotificationService( ns.getName() );
    try
    {
      // all calls should fail
      Util.getObjectName( ns );
      ns.getName();
      ns.getUserData();
      failure( "expecting exception due to missing MBean" );
    }
    catch( Exception e )
    {
      // root cause should be an InstanceNotFoundException containing the ObjectName

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    throws InstanceNotFoundException
  {
    // use the NotificationServiceMgr as a convenient way of making
    // an MBean (a NotificationService) come and go.
    final NotificationServiceMgr  mgr  = getDomainRoot().getNotificationServiceMgr();
    final NotificationService  ns  = mgr.createNotificationService( "UserData", 10 );
    final ObjectName  nsObjectName  = Util.getObjectName( ns );
    assert( ns.getUserData().equals( "UserData" ) );
    
    final ProxyFactory  factory  = getProxyFactory();
    final NotificationService  proxy  =
      factory.getProxy( nsObjectName, NotificationService.class, false );
    assert( proxy == ns ) : "proxies differ: " + ns + "\n" + proxy;
    
    mgr.removeNotificationService( ns.getName() );

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  testCreateRemove()
    throws Exception
  {
    final NotificationServiceMgr  proxy  = getNotificationServiceMgr();
    
    final NotificationService  service  = proxy.createNotificationService( "test1", 512 );
    
    final ObjectName  objectName  = Util.getObjectName( service );
    
    proxy.removeNotificationService( service.getName() );
    assert( ! getConnection().isRegistered( objectName ) );
  }

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Related Classes of com.sun.appserv.management.base.NotificationService

com.sun.enterprise.management.base.NotificationServiceMgrTest

com.sun.enterprise.management.base.NotificationServiceTest

com.sun.enterprise.management.client.MiscTest

com.sun.enterprise.management.client.ProxyFactoryTest

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