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Subject: Re: [sca-c-cpp] NEW ISSUE: C++ componentType file name and location

This issue has been assigned id CCPP-26 in the Jira system.
See http://www.osoa.org/jira/browse/CCPP-26



Andrew Borley
Websphere ESB Development
Tel: 245393 Ext: +44 (0) 1962 815393 Mob: +44 (0) 7971 805547
E-mail: borley@uk.ibm.com
Mailpoint 211, IBM (UK) Ltd, Hursley Park, Winchester, Hants, SO21 2JN

Bryan Aupperle <aupperle@us.ibm.com> wrote on 10/12/2007 20:36:51:

> TARGET: C++ C&I Specification
> Description:  We need to finalize the name and location of
> componentType files as well as any other SCDL metadata related to
> componentType files.
> Key points from the assembly specification:
> - Lines 482-483 of WD01 state that the componentType file has the
> same name as the implementation file but the extension .
> componentType.  But the location is implementation technology
> dependent (lines 484-486).
> - In the SCDL, the component only defines the componentType
> indirectly via the implementation.xxx
> - The componentType schema does not provide a name for a componentType
> As I see the requirements:
> - The information in implementation.xxx must uniquely identify the
> componentType file.
> - It needs to be possible to find the file in a simple manner.
> - It is reasonable to expect multiple component implementations to
> be compiled into a single DLL/shared library/etc.
> Proposal:
> Naming:  There are two choices.
> 1) The implementation name is considered to be the implementation
> header name.  This implies an implementation header MUST only
> contain one class defining a componentType (it MAY contain other classes).
> 2) The implementation name is considered to be the implementation
> class name.  This means if the implementation class is the only
> class in the header file then the header file must be parsed to find
> the class name.  Alternatively we could make the implementation
> class attribute required.
> I favor option 1 as the least metadata to specify and being
> consistent with common programming practice.
> Location: The current text requires a header file that declares the
> implementation class and that this file be available from the SCA
> registry/repository - specifically using a relative path from the
> composite root.  The logical place for the componentType file to be
> placed is in the same directory as the implementation header file.  
> The only reason I can think of to do something different is if we
> believe there is a requirement to place implementation header files
> in a directory with restricted access and componentType files in a
> publically readable directory.  I do not believe this is a requirement.
> Bryan Aupperle, Ph.D.
> STSM, WebSphere Enterprise Platform Software Solution Architect
> Master Inventor
> Research Triangle Park,  NC
> +1 919-254-7508 (T/L 444-7508)
> Internet Address: aupperle@us.ibm.com

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