-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Lennart Regebro wrote: > On Tue, Dec 1, 2009 at 01:16, Gary Poster <gary.pos...@gmail.com> wrote: >> I don't love "singleton." I think it is better than "utility." I agree at >> least that it probably isn't better enough to introduce confusion. I'd be >> more insistent on "singleton", or finding a better term than either of them, >> if this were a fresh API. > > I wonder if the best isn't to make the documentation clearly say > "Utilties are singleton components that can be looked up per > interface".
+1 to improving the documentation. - -1 to using the term "singleton". The term is loaded up with things that aren't relevant to what utilities do: in particular, there is no requirement / promise that the object registered as a utilitiy is an instance of a class, much less that its class / module jumps through hoops to guarantee that only one instance can exist. The promise is merely that the object returned from the lookup will provide the given interface: no more, no less. I have often registered functions as utilities, for instance, where the contract of the corresponding interface was just that it be callable with a given signature. I even recall registering a module as a utility, although I can't find the example at the moment. "Global objects" is a more accurate description of the things registered as utilities from ZCML / imperative code: even that term is inaccurate once persistent objects get registered.  See the description of the Singleton pattern in the mother-of-all-wikis: http://www.c2.com/cgi/wiki?SingletonPattern Tres. - -- =================================================================== Tres Seaver +1 540-429-0999 tsea...@palladion.com Palladion Software "Excellence by Design" http://palladion.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAksVRvMACgkQ+gerLs4ltQ79/gCfbUH7gsgJT6yER0U/zBUxrT0E qzQAoKYOe6OnLRXs4bveRXST8Ogkxwj6 =eh4i -----END PGP SIGNATURE----- _______________________________________________ Zope-Dev maillist - Zope-Dev@zope.org https://mail.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - https://mail.zope.org/mailman/listinfo/zope-announce https://mail.zope.org/mailman/listinfo/zope )