Zoran Jeremic wrote:
Hi,
I've created Tuscany Web service that returns an instance of Java class.
Then I work locally on this class and change it's properties. However,
when I access the same instance from web service, there is no change on
it's properties. As I'm new with tuscany I'm wondering if this java
instance I get through tuscany behaves as the same instance or as
another instance? Do I have to pass and change the old instance with the
updated one?
Thanks
Zoran,
I think that Simon explains things very well.
Services are not like simple Java classes - the idea is that the service and the client are
independent and are only connected through the contract defined by the service interface - and
separation of the client and the service provider is a key goal of the services model.
So, if you want a service operation which returns some Java object/data structure from the service
provider to the client - and then allow the client to modify that Java object and pass back the
changed object to the service, then you should design a service interface that has a second
operation that passes back the modified object to the service.
Something like:
public interface ServiceFoo {
public Foo getAFoo( );
public void returnUpdatedFoo( Foo updatedFoo );
}
Note that this potentially allows for the service to have many clients simultaneously and for the
service to deal with independent updates. Handing out a single Java object from the service would
be a recipe for disaster if there are multiple clients.
Yours, Mike.
