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annotate planemo/lib/python3.7/site-packages/dateutil/tz/_factories.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
parents d30785e31577
children
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1 from datetime import timedelta
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2 import weakref
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3 from collections import OrderedDict
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4
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5 from six.moves import _thread
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6
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8 class _TzSingleton(type):
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9 def __init__(cls, *args, **kwargs):
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10 cls.__instance = None
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11 super(_TzSingleton, cls).__init__(*args, **kwargs)
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12
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13 def __call__(cls):
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14 if cls.__instance is None:
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15 cls.__instance = super(_TzSingleton, cls).__call__()
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16 return cls.__instance
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17
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18
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19 class _TzFactory(type):
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20 def instance(cls, *args, **kwargs):
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21 """Alternate constructor that returns a fresh instance"""
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22 return type.__call__(cls, *args, **kwargs)
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23
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24
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25 class _TzOffsetFactory(_TzFactory):
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26 def __init__(cls, *args, **kwargs):
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27 cls.__instances = weakref.WeakValueDictionary()
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28 cls.__strong_cache = OrderedDict()
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29 cls.__strong_cache_size = 8
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30
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31 cls._cache_lock = _thread.allocate_lock()
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32
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33 def __call__(cls, name, offset):
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34 if isinstance(offset, timedelta):
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35 key = (name, offset.total_seconds())
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36 else:
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37 key = (name, offset)
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38
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39 instance = cls.__instances.get(key, None)
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40 if instance is None:
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41 instance = cls.__instances.setdefault(key,
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42 cls.instance(name, offset))
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43
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44 # This lock may not be necessary in Python 3. See GH issue #901
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45 with cls._cache_lock:
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46 cls.__strong_cache[key] = cls.__strong_cache.pop(key, instance)
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47
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48 # Remove an item if the strong cache is overpopulated
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49 if len(cls.__strong_cache) > cls.__strong_cache_size:
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50 cls.__strong_cache.popitem(last=False)
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51
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52 return instance
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55 class _TzStrFactory(_TzFactory):
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56 def __init__(cls, *args, **kwargs):
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57 cls.__instances = weakref.WeakValueDictionary()
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58 cls.__strong_cache = OrderedDict()
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59 cls.__strong_cache_size = 8
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60
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61 cls.__cache_lock = _thread.allocate_lock()
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62
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63 def __call__(cls, s, posix_offset=False):
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64 key = (s, posix_offset)
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65 instance = cls.__instances.get(key, None)
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66
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67 if instance is None:
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68 instance = cls.__instances.setdefault(key,
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69 cls.instance(s, posix_offset))
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70
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71 # This lock may not be necessary in Python 3. See GH issue #901
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72 with cls.__cache_lock:
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73 cls.__strong_cache[key] = cls.__strong_cache.pop(key, instance)
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74
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75 # Remove an item if the strong cache is overpopulated
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76 if len(cls.__strong_cache) > cls.__strong_cache_size:
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77 cls.__strong_cache.popitem(last=False)
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78
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79 return instance
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80