Hi all,
I asked few doubts regarding CMP 1.1 in my previous mail. My third query
went answered. Somebody plz clarify on that.
3) I was goin thru AggregateEntity Pattern. The pattern directs to use a
Coarse Grained Object composed of various Fine Grained Object. And the
Aggregate Entity(EJB) will have Coarse Grained Object as one of its
instance(one of strategy). In this case how will I map the Coarse Grained
Object to the persistence Schema.
I have presented an EJB(see below) demonstrating the usuage of reference to
a Remote Object within a CMP. This is a test sample and it works well. Plz
let me know whether the approach is correct.
And if I implement Address as an Dependent Object instead of entity bean,
then again how do I persist the information from the dependent object to the
Database.
Thanks,
Shreedhar Natarajan
/* Source */
package com.ami.customer.customer;
import java.rmi.*;
import java.util.*;
import javax.ejb.*;
import javax.naming.*;
import javax.rmi.*;
import com.ami.customer.address.*;
import com.ami.customer.valueobjects.AddressVO;
/**
*
*/
public class CustomerEJB implements EntityBean
{
private Context initialContext;
private EntityContext ejbContext;
/*
For every customer id there is an entity in the Address table.
Customer id links the customer table and the address table
*/
public String id;
public transient Address address; // Remote reference to the address
ejb.
public String ejbCreate(String _id, AddressVO _addressVO) throws
CreateException
{
this.id = _id;
try
{
createAddress(_addressVO);
}
catch(Exception e)
{
throw new CreateException(e.getMessage());
}
return null;
}
public void ejbPostCreate(String _id, AddressVO _addressVO) throws
CreateException
{
// Nothing to do here
}
public void ejbActivate() throws EJBException
{
}
public void ejbPassivate() throws EJBException
{
this.address = null;
}
public void ejbRemove() throws EJBException
{
this.address=null;
}
public void ejbLoad() throws EJBException
{
try
{
if (this.address == null)
this.loadAddress();
}
catch(Exception e)
{
throw new EJBException(e);
}
}
public void ejbStore() throws EJBException
{
}
public void setEntityContext(EntityContext ctx) throws EJBException
{
ejbContext = ctx;
}
public void unsetEntityContext() throws EJBException
{
ejbContext = null;
}
public AddressVO getAddress()
{
try
{
return address.getAddress() ;
}
catch(Exception exception)
{
throw new EJBException(exception);
}
}
/**
* Set address
*
* @param address
*/
public void createAddress(AddressVO _addressVO) throws Exception
{
try
{
InitialContext jndiContext = new InitialContext();
Object addrRef =
jndiContext.lookup("java:comp/env/ejb/Address");
AddressHome addressHome =
(AddressHome) PortableRemoteObject.narrow( addrRef,
AddressHome.class);
this.address = addressHome.create(this.id,_addressVO);
}
catch(Exception e)
{
throw e;
}
}
public void loadAddress() throws Exception
{
InitialContext jndiContext = new InitialContext();
Object addrRef =
jndiContext.lookup("java:comp/env/ejb/Address");
AddressHome addressHome =
(AddressHome) PortableRemoteObject.narrow(
addrRef, AddressHome.class);
this.address =
addressHome.findByPrimaryKey(this.id);
}
}
// End of Source
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