Re: [sca-j] Should introduction of @Local annotation (JAVA-3) affect theSemantics of an Unannotated Implementation

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

Simon,

The algorithm for calculating the componentType
of an unannotated implementation already makes a 
distinction dependent on the marking
of an interface used by the implementation, so the different rules
already exist:

Lines 384/385 from the C&I spec:


If its type is complex, then if the type
is an interface marked by @Remotable, then it is a reference; otherwise,
it is a property. 

The introduction of an @Local annotation
would affect this part of the spec at least.  I would expect that
an annotated interface would
be regarded as marking a reference,
even if it is marked @Local.  

By extension, it is worth asking whether
*any* SCA annotation in the interface implies treating its use as indicating
a reference.


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

From:	Simon Nash/UK/IBM@IBMGB
To:	"OASIS Java" <sca-j@lists.oasis-open.org>
Date:	27/08/2008 18:13
Subject:	Re: [sca-j] Should introduction of @Local annotation (JAVA-3) affect the Semantics of an Unannotated Implementation

---

I take a slightly different view on this.  I think an unannotated
implementation is exactly that.  I don't think it means that all the
interfaces referenced by the implementation must also be unannotated.  However,
I'm open to discussion on the best way to handle this.  Perhaps we
need different rules for: 
 1. Unannotated implementation / unannotated interfaces
 2. Unannotated implementation / annotated interfaces
 3. Annotated implementation 

    Simon 

Simon C. Nash, IBM Distinguished Engineer
Member of the IBM Academy of Technology
Tel. +44-1962-815156  Fax +44-1962-818999

Mike Edwards/UK/IBM@IBMGB

27/08/2008 10:42

To	"OASIS Java" <sca-j@lists.oasis-open.org>
cc
Subject	Re: [sca-j] Should introduction of @Local annotation (JAVA-3) affect the Semantics of an Unannotated Implementation

Folks, 

An @Local annotation would certainly affect the semantics of an unannotated
implementation. 

An interface so marked would clearly indicate something relating to an
SCA reference. 


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

From:	C Vamsi <vamsic007@in.ibm.com>
To:	Simon Nash/UK/IBM@IBMGB
Cc:	sca-j@lists.oasis-open.org
Date:	27/08/2008 09:09
Subject:	[sca-j] Should introduction of @Local annotation (JAVA-3) affect the Semantics of an Unannotated Implementation

---

Simon,

Should the introduction of @Local annotation affect the "Semantics
of an
Unannotated Implementation" (section 8 in sca-javaci-draft-20070926.doc)
where we are currently using only interfaces marked with @Remotable in
computing the references/properties of an implementation?

++Vamsi


                    
                     
                     
        
           Simon Nash        
                     
                     
           <NASH@uk.ibm.com>    
                     
                  
                    
                     
                     
     To 
           27/08/2008 12:57      
   sca-j@lists.oasis-open.org          
                    
                     
                     
     cc 
                    
                     
                     
        
                    
                     
                     
Subject 
                    
                Re: [sca-j] Introspecting
services  
                    
                offered by a Java
implementation    
                    
                class without @Service
             
                    
                     
                     
        
                    
                     
                     
        
                    
                     
                     
        
                    
                     
                     
        
                    
                     
                     
        
                    
                     
                     
        




Raymond,
Minor nit: the @OneWay annotation applies to a method, not to an
interface.  Your example should be updated to show this.

In your example, these services are local.  Issue JAVA-3 has proposed
a new
annotation @Local that could be used on Interface1and Interface2 to allow
them to be recognized by the introspection algorithm.

I believe this discussion can be handled under JAVA-3 and there is no need
to create a new issue.

   Simon

Simon C. Nash, IBM Distinguished Engineer
Member of the IBM Academy of Technology
Tel. +44-1962-815156  Fax +44-1962-818999


                    
                     
                     
        
Raymond Feng                  
                     
                     
<rfeng@us.ibm.com>              
                     
                   
                    
                     
                     
     To 
25/08/2008 17:25                
           sca-j@lists.oasis-open.org  
 
                    
                     
                     
     cc 
                    
                     
                     
        
                    
                     
                     
Subject 
                    
                     
[sca-j] Introspecting         
                    
                     
services offered by a Java    
                    
                     
implementation class without  
                    
                     
@Service                  
   
                    
                     
                     
        
                    
                     
                     
        
                    
                     
                     
        
                    
                     
                     
        
                    
                     
                     
        
                    
                     
                     
        
                    
                     
                     
        





Hi,

In Java Component Implementation Specification 1.00, we have the following
statements:

143 1.2.1.3. Introspecting services offered by a Java implementation
144 In the cases described below, the services offered by a Java
implementation class may be determined
145 through introspection, eliding the need to specify them using @Service.
The following algorithm is used to
146 determine how services are introspected from an implementation class:
147 If the interfaces of the SCA services are not specified with the
@Service annotation on the implementation
148 class, it is assumed that all implemented interfaces that have been
annotated as @Remotable are the
149 service interfaces provided by the component. If none of the
implemented interfaces is remotable, then by
150 default the implementation offers a single service whose type is the
implementation class.

What if an interface is annotated with SCA annotations such as @OneWay
or
@Callback?

For example:

public class MyServiceImpl implements Interface1, Interface2 {
}

@Callback(CallbackInterface.class)
public interface Interface1 {
}

@OneWay
public interface Interface2 {
}

By the spec, there is only one service named MyServiceImpl. But isn't it
more natural that we should find two SCA services: Interface1 and
Interface2? Please clarify.

Thanks,
Raymond


Raymond Feng
Senior Software Engineer, Open Source SCA Development, Apache Tuscany
Project
IBM Bay Area Lab, 1001 E Hillsdale Blvd, Suite 400, Foster City, CA 94404,
USA
E-mail: rfeng@us.ibm.com, Notes: Raymond Feng/Burlingame/IBM, Tel:
650-645-8117, T/L: 367-8117
Web & Blog: www.enjoyjava.com
- The Cyber Cafeteria to Enjoy Java












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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

---

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