[TransWarp] The new binding API names
Phillip J. Eby
pje at telecommunity.com
Thu Sep 4 14:04:45 EDT 2003
Okay, after further discussion, we've got it nailed down to these three:
Require means that the user of the component must supply the value
directly. Obtain means that the desired object/value must be able to be
found by the component. Make means that the component will produce the
needed object/value on its own. All three, of course, will be overrideable
by subclassing, setattr, or constructor keyword arguments.
The mapping from the old API to the new is pretty straightforward. Once
and New will be Make. bindTo and bindSequence will be
Obtain. requireBinding will be Require. All of the lesser APIs will then
fold into special cases, e.g. binding.Constant will probably become
Make(value=whatever), binding.Copy(expr) will be binding.Make(lambda:
expr), and so on.
This won't be implemented immediately, as there's some groundwork I want to
do first, like adding a 'protocols.sequenceOf()' API, so that we can easily
define adapters from sequences of things. I do intend to do have it
completed (and the old API marked deprecated) in the 0.5a3 release. Some
time after 0.5a3 is released, the old API will be removed.
In practice, y'all should have lots of time to make the change, because
I'll have to do significant surgery on the tutorial before the a3 release,
in order to document the new API.
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