com.neurosys.ecom.orders.events

Class OrderItemProductChangeListener

java.lang.Object

com.neurosys.ecom.orders.events.OrderItemProductChangeListener

All Implemented Interfaces:

ListeningProcess, ChangeListener<Object[]>, Serializable, EventListener

public class OrderItemProductChangeListener
extends Object
implements ChangeListener<Object[]>, ListeningProcess

OrderItem.getProduct() enforces a nullable Ref-Integrity. In particular Deletes on a Product will not be possible if it is associated with an OrderItem. While its the responsibility of the OrderStrategy to decide when to break that relation and nullify it; in the interim Product Operations may not be able to wait. For this reason, a configurable way is provided to check the relation.

It accepts the following events:

• Object[]{before-delete-sub-hierarchy, String id/Long id/Product}
• Object[]{before-delete, String id/Long id/Product}
• Object[]{before-delete, List<Product Ids as Long>}

Author:

Arjun Dhar TODO: Add unit test case

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected javax.persistence.EntityManager	em

Constructor Summary

Constructors

Constructor and Description
OrderItemProductChangeListener()

Method Summary

Modifier and Type	Method and Description
protected void	beforeDelProduct(Product product)
protected void	beforeDelProducts(Object ids)
protected void	beforeDelProductSubHierarchy(Product category)
void	onChange(ChangeGenerator generator, Object[] event) For UI, Single record based interactions
void	onChange(ProcessState processState, Process.Event event, Process.EventPoint eventPoint) For ETL Operations

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

em

protected javax.persistence.EntityManager em

Constructor Detail

OrderItemProductChangeListener

public OrderItemProductChangeListener()

Method Detail

onChange

public void onChange(ProcessState processState,
                     Process.Event event,
                     Process.EventPoint eventPoint)
              throws ContinueProcessingException

For ETL Operations

Specified by:

onChange in interface ListeningProcess

Parameters:

processState - as ProcessState

event - as Process.Event

eventPoint - as Process.EventPoint

Throws:

ContinueProcessingException; - since the Check is to simply Warn the user not Abort the process

ContinueProcessingException

onChange

public void onChange(ChangeGenerator generator,
                     Object[] event)

For UI, Single record based interactions

Specified by:

onChange in interface ChangeListener<Object[]>

Parameters:

generator - as the generator that caused the change. Specially useful if the Listener is subscribing to multiple ChangeGenerators

event - as the model change communicated

beforeDelProducts

protected void beforeDelProducts(Object ids)

beforeDelProduct

protected void beforeDelProduct(Product product)

beforeDelProductSubHierarchy

protected void beforeDelProductSubHierarchy(Product category)