Entity Notification

Entity Change Notifications

To receive Atlas entity notifications a consumer should be obtained through the notification interface. Entity change notifications are sent every time a change is made to an entity. Operations that result in an entity change notification are:

• ENTITY_CREATE - Create a new entity.
• ENTITY_UPDATE - Update an attribute of an existing entity.
• TRAIT_ADD - Add a trait to an entity.
• TRAIT_DELETE - Delete a trait from an entity.

    // Obtain provider through injection…
    Provider<NotificationInterface> provider;

    // Get the notification interface
    NotificationInterface notification = provider.get();

    // Create consumers
    List<NotificationConsumer<EntityNotification>> consumers =
       notification.createConsumers(NotificationInterface.NotificationType.ENTITIES, 1);

The consumer exposes the Iterator interface that should be used to get the entity notifications as they are posted. The hasNext() method blocks until a notification is available.

    while(consumer.hasNext()) {
        EntityNotification notification = consumer.next();

        IReferenceableInstance entity = notification.getEntity();
        …
    }