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comparison 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
parents
children aca04e175488
comparison
equal deleted inserted replaced
439:c0700c6d9545 440:32c7c2d219d2
1 import re
2 import collections.abc
3
4
5 re_endpoint_sep = re.compile(r'[\/\.]')
6
7
8 class DataProvidersData(collections.abc.Mapping):
9 def __init__(self, page):
10 self._page = page
11 self._dict = None
12
13 def __getitem__(self, name):
14 self._load()
15 return self._dict[name]
16
17 def __iter__(self):
18 self._load()
19 return iter(self._dict)
20
21 def __len__(self):
22 self._load()
23 return len(self._dict)
24
25 def _load(self):
26 if self._dict is not None:
27 return
28
29 self._dict = {}
30 for source in self._page.app.sources:
31 endpoint_bits = re_endpoint_sep.split(source.data_endpoint)
32 endpoint = self._dict
33 for e in endpoint_bits[:-1]:
34 if e not in endpoint:
35 endpoint[e] = {}
36 endpoint = endpoint[e]
37 override = endpoint.get(endpoint_bits[-1])
38 provider = source.buildDataProvider(self._page, override)
39 endpoint[endpoint_bits[-1]] = provider