PortableRemoteObject.narrow() purpose?

[Vjeran Marcinko]

Hi folks.

What is the purpose of PortableRemoteObject.narrow() ? It throws ClassCastException same as any unsuccessuful casting would do using only brackets, for eg. :
CastedClass castedObject = (CastedClass) object;
thus it could be ommitted then, right ?

Ragards,
Vjeran

 

[Dobromir Gaydarov]

The trick is that you have to do both narrow and cast to the type you want
if you are dealing with remote objects.

Regards,
Dobromir


Hi folks.

What is the purpose of PortableRemoteObject.narrow() ? It throws
ClassCastException same as any unsuccessuful casting would do using only
brackets, for eg. :
CastedClass castedObject = (CastedClass) object;
thus it could be ommitted then, right ?

Ragards,
Vjeran

 

[EJP]

It is a network operation.

 

[Adam Maass]

What is the purpose of PortableRemoteObject.narrow() ? It throws

ClassCastException same as any >unsuccessuful casting would do using only
brackets, for eg. :

CastedClass castedObject = (CastedClass) object;
thus it could be ommitted then, right ?

If you are doing remote operations, then PortableRemoteObject.narrow()
resolves issues with certain frameworks -- namely CORBA -- that have no
notion of java-style inheritence. The method takes an object (a remote stub)
and an interface (respresented by its Class object) and returns an object
that implements that interface and that also corresponds to the passed
remote stub. Usually, this is the same object that was passed in. But
sometimes it isn't.

-- Adam Maass