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annotate piecrust/events.py @ 1188:a7c43131d871

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bake: Fix file write flushing problem with Python 3.8+ Writing the cache files fails in Python 3.8 because it looks like flushing behaviour has changed. We need to explicitly flush. And even then, in very rare occurrences, it looks like it can still run into racing conditions, so we do a very hacky and ugly "retry" loop when fetching cached data :(
author Ludovic Chabant <ludovic@chabant.com>
date Tue, 15 Jun 2021 22:36:23 -0700
parents f070a4fc033c
children
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f485ba500df3 Gigantic change to basically make PieCrust 2 vaguely functional.
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2 class Event(object):
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f070a4fc033c core: Continue PieCrust3 refactor, simplify pages.
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3 """ A simple implementation of a subscribable event.
f070a4fc033c core: Continue PieCrust3 refactor, simplify pages.
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4 """
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5 def __init__(self):
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6 self._handlers = []
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8 def __iadd__(self, handler):
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9 self._handlers.append(handler)
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10 return self
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12 def __isub__(self, handler):
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13 self._handlers.remove(handler)
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14 return self
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16 def fire(self, *args, **kwargs):
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17 # Make a copy of the handlers list in case some handler removes
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18 # itself while executing.
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19 handlers = list(self._handlers)
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20 for handler in handlers:
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21 handler(*args, **kwargs)
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