Re: [gobo-eiffel-develop] cluster structure of bridge pattern

[Eric B. <er...@go...>]

Andreas Leitner wrote:
> 
> foo ... main cluster of GOBO-sub-library "foo"
> foo/interfaces ... all interfaces subclusters go in here
> foo/interfaces/bar ... bar is an interface-subcluster
> foo/interface/foobar ... foobar is an interface-subcluster
> foo/impl  ... all implementations go in here
> foo/impl/win32 ... the win32 impl
> foo/impl/win32/foo .. the "foo" impl for win32
> foo/impl/win32/foobar .. the "foobar" impl for win32
> foo/impl/unix/foo ... the "foo" impl for unix
> foo/impl/unix/foobar ... the "foobar" impl for unix
> 
> Here the user mounts (remember a mount, also mounts the sublcusters)
> 
> foo/interfaces
> foo/impl/${PLATFORM}
> 
> Q.E.D.
> 
> What do you think?

I think something is missing in your bridge pattern.
What interface are you talking about in foo/interfaces
(BTW, I would prefer foo/interface (singular)): user-
interface or the deferred classes parents of the
classes in foo/impl/${PLATFORM}/*?

If I understand correctly, you just want to 
mount:

foo/interfaces
foo/impl/${PLATFORM}

instead of:

foo/bar
foo/foobar
foo/impl/${PLATFORM}

Personally I have the feeling that this extra directory
'interface' is artificial. If you consider XM_PARSER to
be part of the "interface" of the xml library, then
DS_LINKED_LIST is part of the "interface" of the
container library as well, and as such we should also
add this dummy directory to the container library:

structure/interface/list
structure/interface/set
structure/interface/table
...

So it looks like the only reason why you want to add this
extra directory is to save typing characters in the XACE
file rather than to get a better directory structure. Is
it really a good reason?

> Here the user mounts (remember a mount, also mounts the sublcusters)

Could you have an option in XACE which excludes some
specified clusters from a library? This looks like
a better solution to me if you want to save typing
characters:

  mount foo
     exclude
        impl/unix

I'll let you find an XML syntax for that, but I hope
you got the idea.

-- 
Eric Bezault
mailto:er...@go...
http://www.gobosoft.com