Krishnan Subramanian wrote:
> ...
>
> Taking the case of value objects, if an entity bean creates a value
> object (representing its CMP or subset of CMP fields) and returns this
> value object to a session bean in the same process using PbR
> semantics, I still cannot modify immutable CMP fields by just setting
> these in the value object. Performance of course might be faster
> because the ejb container does not perform a copy of the value object
> when returning it to the session bean via its local interface,
> but as an ejb developer, I cannot do any fancy PbR thingies with
> the value object unless of course I use mutable objects as CMP field
> types.
If you call:
myValueObject = myEntity.getValueObject();
then it is agreed that setting fields on myValueObject does not directly
change the corresponding CMP fields, you would need to add:
myEntity.setValueObject(myValueObject);
to apply your changes. However these get/set methods (for a large
value object) would perform much better.
Also, quite apart from performance considerations one of the key
requirements for value objects are where pass-by reference semantics
are 'required' to support passing of local object references between
beans. Local object references cannot be marshalled.
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