Re: [sca-assembly] Operation Overloading and multiple @Remotable interfaceson one Component - presuming this is allowed.

[Mike Edwards <mike_edwards@uk.ibm.com>]

Mark,

I believe that you're right - 

- a Java implementation used by SCA
can have method overloading
- SCA only prevents interfaces from
being used that have method/operation overloading

- I believe that the restriction on
interfaces is based on the operation overloading restriction
that was introduced into later version
of WSDL.

Yours,  Mike.

Strategist - Emerging Technologies, SCA & SDO.
Co Chair OASIS SCA Assembly TC.
IBM Hursley Park, Mail Point 146, Winchester, SO21 2JN, Great Britain.
Phone & FAX: +44-1962-818014    Mobile: +44-7802-467431  
Email:  mike_edwards@uk.ibm.com

"Mark Combellack" <mcombellack@avaya.com>

31/03/2008 15:48

To	"OASIS Assembly" <sca-assembly@lists.oasis-open.org>
cc
Subject	[sca-assembly] Operation Overloading and multiple @Remotable interfaces on one Component - presuming this is allowed.

Hi,
 
I have a question about operation overloading
when a Component implements multiple @Remotable interfaces.
 
I know that on a single @Remotable interface,
I cannot use operation overloading. The Assembly specification disallows
this:
 
http://www.oasis-open.org/apps/org/workgroup/sca-assembly/download.php/27619/sca-assembly-1.1-spec-WD-03.pdf
 
2264
       The style
of remotable interfaces is typically coarse grained and intended
for loosely coupled 
2265
       interactions.
Remotable service Interfaces MUST NOT make use of method or operation

2266
       overloading.

 
As a result, I cannot do the following:
 
@Remotable
public interface TimeService {
    Date getCurrentTime();
    Date getCurrentTime(String
timeZone);
}
 
 
However, is it valid for a Component to implement
multiple @Remotable interfaces that have operations with the same name
but different parameters? Each @Remotable interface does not have operation
overloading but the resulting Component does.
 
I’ll give you a Java example.
 
I have two @Remotable services as defined
by the following Java interfaces:
 
@Remotable
public interface LocalTimeService {
    Date getCurrentTime();
}
 
@Remotable
public interface WorldTimeService {
    Date getCurrentTime(String
timeZone);
}
 
 
I have a single Java Component that implements
both of these @Remotable Interfaces:
 
@Service(interfaces = {LocalTimeService.class,
WorldTimeService.class})
public void class TimeServiceImpl implements
LocalTimeService, WorldTimeService {
 
    public Date getCurrentTime()
{
        // Code
not shown
    }
 
    public Date getCurrentTime(String
timeZone) {
        // Code
not shown
    }
}
 
 
It can be seen that the Java Implementation
of the Component does have operation overloading but I am presuming that
this is allowed since each @Remotable interface exposed by the Component
does not use operation overloading.
 
Thanks,
 
Mark

---

Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number 741598.
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU