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

[David Booz <booz@us.ibm.com>]

Right.  It works because there are actually two services.  SCA is not
concerned about overloading across services only within a service.


Dave Booz
STSM, SCA and WebSphere Architecture
Co-Chair OASIS SCA-Policy TC
"Distributed objects first, then world hunger"
Poughkeepsie, NY (845)-435-6093  or  8-295-6093
e-mail:booz@us.ibm.com
http://washome.austin.ibm.com/xwiki/bin/view/SCA2Team/WebHome


                                                                           
             Mike Edwards                                                  
             <mike_edwards@uk.                                             
             ibm.com>                                                   To 
                                       "OASIS Assembly"                    
             03/31/2008 11:21          <sca-assembly@lists.oasis-open.org> 
             AM                                                         cc 
                                                                           
                                                                   Subject 
                                       Re: [sca-assembly] Operation        
                                       Overloading and multiple @Remotable 
                                       interfaces on one Component -       
                                       presuming this is allowed.          
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           





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                                                    
 >                                                                         
                                                                        To 
                                 "OASIS Assembly"                          
 31/03/2008 15:48                <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








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