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annotate piecrust/data/providersdata.py @ 440:32c7c2d219d2

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performance: Refactor how data is managed to reduce copying. * Make use of `collections.abc.Mapping` to better identify things that are supposed to look like dictionaries. * Instead of handling "overlay" of data in a dict tree in each different data object, make all objects `Mapping`s and handle merging at a higher level with the new `MergedMapping` object. * Since this new object is read-only, remove the need for deep-copying of app and page configurations. * Split data classes into separate modules.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 28 Jun 2015 08:22:39 -0700
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children aca04e175488
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440
32c7c2d219d2 performance: Refactor how data is managed to reduce copying.
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1 import re
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2 import collections.abc
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3
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5 re_endpoint_sep = re.compile(r'[\/\.]')
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8 class DataProvidersData(collections.abc.Mapping):
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9 def __init__(self, page):
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10 self._page = page
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11 self._dict = None
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12
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13 def __getitem__(self, name):
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14 self._load()
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15 return self._dict[name]
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16
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17 def __iter__(self):
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18 self._load()
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19 return iter(self._dict)
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20
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21 def __len__(self):
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22 self._load()
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23 return len(self._dict)
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24
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25 def _load(self):
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26 if self._dict is not None:
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27 return
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28
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29 self._dict = {}
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30 for source in self._page.app.sources:
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31 endpoint_bits = re_endpoint_sep.split(source.data_endpoint)
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32 endpoint = self._dict
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33 for e in endpoint_bits[:-1]:
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34 if e not in endpoint:
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35 endpoint[e] = {}
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36 endpoint = endpoint[e]
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37 override = endpoint.get(endpoint_bits[-1])
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38 provider = source.buildDataProvider(self._page, override)
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39 endpoint[endpoint_bits[-1]] = provider