Config of a Store

[Kjetil Kjernsmo]

Hi Greg and the rest! :-)

I was thinking about how we do configuration of an RDF::Trine::Store. While 
new_with_string has been useful, it has also become a little hard to work 
with for some of the stuff I've been doing, so rather than discuss in the 
little overlapping IRC time we have, I figured I'd bring it to the list.

I feel that it would be better to pass a hashref with the config, than 
coming up with a universal string to work in all circumstances. For 
example, I currently need to load a TriG file with a relative path in the 
filesystem, and it seems I have to specify the syntax and the base URI, and 
I can't currently do that. Also, we run the risk of having the syntax for 
each subclass diverge too much. In the future, I may also been interested 
in stuff like checking and reload the file if it has changed.

In addition, it is trivial to construct a hashref based on the CPAN config 
modules, such as Config::Any. 

So, I'm thinking about something like

{ store => 'DBI',
  name => 'mymodel',
  dsn => 'DBI:mysql:database=rdf',
  username => 'dahut',
  password => 'Str0ngPa55w0RD'
} 

for a MySQL-backed DBI-store.

For a Memory store that loads from a number of resources on startup, 
something like:

{ store => 'Memory',
  sources => [ 
               { file => 't/data/basic.trig',
                 syntax => 'trig',
                 base => 'http://example.org/' },
               { url => 'http://www.kjetil.kjernsmo.net/foaf',
                 syntax => 'rdfxml',
                 graph => 'http://example.org/graphs/foaf-files' },
             ]
}

and Redland can be done like this:

{ store => 'Redland',
  storage_name => 'hashes',
  name => 'test',
  options => { host=>'localhost', 
               database=>'testdb',
               user=>'testuser' }
}


What do you think about this?


Cheers,

Kjetil
-- 
Kjetil Kjernsmo
kjetil at kjernsmo.net
http://www.kjetil.kjernsmo.net/