Whether using Moose or not, I usually solve the problem by defining a single Config.pm unit which exposes a single variable (or, as the case may be, a subroutine). And so, “here is where all the configuration variables can be found.” All that you have to do is to use it.
Furthermore, I usually define within that unit a conf(variable, variable ...) subroutine which, given a list of keys as its argument list ... (@_) ... traverses the (otherwise private ...) data-structure which it defines, returning a reference that corresponds to the nested list of keys provided ... and dieing if the (nested...) key cannot be found. (This makes an otherwise difficult-to-debug problem trivial to spot, and to trace to the exact bit of code that was requesting it.)
The logic within this accessor-subroutine can be as smart or as dumb as it needs to be. It is simply “the way that everything in the application gets configuration-variables,” and it is equipped to detect and immediately flag any attempts to request undefined keys. Although my code rarely uses actual “singletons,” this is how I would handle any sort of singleton case: a well-known public subroutine returns the appropriate reference on-request.
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||