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

From:
C Vamsi <>

To:
Simon Nash/UK/IBM@IBMGB

Cc:


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      
                     
                     
 

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       To 

             27/08/2008 12:57    
             
 

                    
                     
                     
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  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                  
                     
                     

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       To 

 25/08/2008 17:25                
             
 

                    
                     
                     
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  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: , Notes: Raymond Feng/Burlingame/IBM, Tel:

650-645-8117, T/L: 367-8117

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- The Cyber Cafeteria to Enjoy Java

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