Dispatching to SCA services

Following on from a recent discussion on this list [1] I've
been
looking into how SCA treats directory names and
class/service names.

SCA is designed to provide local PHP to PHP bindings and so
there is
code in the implementation to test whether the SCA service
script is
included from another script (in which case it is assumed
the service
operations are going to be called directly) or whether the
SCA service
script is the direct target of the call (in which case SCA
swings into
action and tries to work out what sort of request it is and
applies
the appropriate bindings).

1/ The conversation [1] identifies another use case where,
for local
organization reasons, the SCA service script is included in
another
PHP script but the intention is that the SCA service script
is the
direct target of incomming requests.

2/ A second requirement from [1] is that SCA services should
be able
to be defined using PEAR class naming standards, i.e. a
class with the
name A_Class_Name lives in the file
somedir/A/Class/Name.php

Looking at the code the solution to both of these
requirements is tied
up in the way that SCA deals with service names and source
file names
internally. The code primarily starts with file names but
there are a
number of places where class names are guessed from file
names and
file names are derived from class names.

In relation to requirement 2/ this movement backward and
forward
between filename and classname poses problems as it is
difficult to
determine one from another accurately given the way that the
code is
layed out at the moment. Also it seems that there are quite
a few
places that conversion between file name and class name take
place.

It would seem sensible that we instigate a change in SCA
where the
determination of file name and class name is centralized and
completed
before the rest of the processing continues. In this way it
seems that
we can remove some of the complexity from the code. I don't
have a
detailed proposal in terms of exact code changes but I'm
keen to hear
comments on this subject based on people's knowledge of the
code and
why things are as they are.

Regards

Simon

[1] http://groups.google.co.uk/group/phpso
a/browse_frm/thread/3142fce2372422ef


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