Yes I know the title is kinda convoluted but so is my question/request for comment.

I have a fairly straightforward session class that does the normal web session stuff ala CGI::Session and a database backend. Within the session blob, I store normal stuff like access privs, name, salutation, etc and then store the session id in a cookie.

The problem I have is shimming this into legacy code. Given a cgi process (or mod_perl request), I can set the session cookie appropriately and follow on processes/requests work fine; however, some legacy code needs that initial session information further down the request (same process). Unfortunately, the code is so OO (or that should be overOO'ed) that I would need to modify half a dozen classes to pass the session along.

What I'm thinking of doing is making the session class a singleton so that the new method will return the just created session. So instead of doing something like this: 

  my $session = My::Session->new();
  my $foo = Foo->new( session => $session );
  # and foo creates Bar passing session, which creates
  # Baz passing session

[download]
I would just do something like this: 
  my $session = My::Session->new();
  my $foo = Foo->new();

  ...
 
  package Baz;

  sub new {
   ...
   $self->{session} = My::Session->new();
  }

[download]

Ideally, I'd like to redo the whole app so this isn't a problem, but that's not really feasible. So my question is does this sound feasible? The session class needs to be mod_perl aware but for that, I would just place the singleton reference into pnotes.

-derby

In reply to RFC Singleton Sessions by derby

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