WIP: Remove eagerness to evaluate extension points. #419
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The laziness is relied on. Change events should not be fired until after first access.
kitchoi
commented
Jun 8, 2021
| # fixme: If the extension point has not been accessed then the | ||
| # provider extension registry can't work out what has changed, so it | ||
| # won't fire a changed event. | ||
| self.assertEqual([1, 2, 3, 98, 99, 100], a.x) |
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This demonstrates the race condition in this comment:
envisage/envisage/extension_point.py
Lines 186 to 190 in bae1be5
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I should have marked this PR as a draft. Unfortunately, one cannot do so after it has been open (makes sense). |
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This may fix #417
Main change: Remove the call which create the extension list cache early.
Prior to #354, there are a number of FIXME comments in the tests indicating that it was a bug to have to rely on first access of an extension in order for subsequent change events to fire. Creating the cache early resolves those FIXME, but #417 suggests that this is either a bug turned feature, or the FIXMEs then were misguided.
The laziness is relied on. Change events should not be fired until after first access.
As a result, it is possible to run into a race condition, but such a race condition may not matter.
(Not done here: Perhaps the FIXMEs should be changed in light of #417, as they are not actually something need solving.)