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Re: Why *Impl_Proxy generated from *Impl?



On Wed, 29 Aug 2001, you wrote:
> Hi all,
> 
> I notice that the interface -> proxy compilation feature of Ozone is not what 
> I'm used to from CORBA and RMI, and so I'm wondering why so I can better 
> understand the underlying design.
> 
> The way Ozone does it, you have --
> 
>   class EmployeeImpl --implements--> interface Employee
> 
>   class EmployeeImpl_Proxy --+--implements--> interface Employee
>                              |
>                              +--is-generated-from--> class EmployeeImpl
> 
> whereas, in CORBA and RMI, the proxy is generated _completely_ from the 
> remote interface; in fact, there may be many implementations (*Impl classes) 
> of the same interface. So we have --
> 
>   class Employee_Proxy --is-generated-from--> interface Employee
> 
>   class EmployeeImplA --implements--> interface Employee
>   class EmployeeImplB --implements--> interface Employee
>   ...
> 
> I can see that the benefits of the 2nd (CORBA/RMI) approach are that the 
> client, which has to physically link in a copy of the "_Proxy" class, need 
> not change at all despite changes to the implementations. It also seems to me 
> that all the Ozone "*Impl_Proxy" class does is invoke the interface's methods 
> remotely on the server. So ... why is the proxy class generated from the 
> implementation?
> 
> I'm sure there's a good answer ... I'm just wondering.

An *Impl class can implement several remote interfaces (OzoneRemote interfaces).

But this is maybe not that important. (?) If there are really good reasons to
change this, we can do.


Falko
-- 
______________________________________________________________________
Falko Braeutigam                              mailto:falko@smb-tec.com
SMB GmbH                                        http://www.smb-tec.com

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