Cython: _ident.py

Yellow lines hint at Python interaction.
Click on a line that starts with a "+" to see the C code that Cython generated for it.

 01: # -*- coding: utf-8 -*-

 02: # Copyright 2018 gevent contributors. See LICENSE for details.

 03: # cython: auto_pickle=False,embedsignature=True,always_allow_keywords=False

04:

 05: from __future__ import absolute_import

 06: from __future__ import division

 07: from __future__ import print_function

08:

09:

+10: from weakref import WeakKeyDictionary

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+11: from weakref import ref

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12:

+13: from heapq import heappop

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+14: from heapq import heappush

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15:

+16: __all__ = [

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 17:     'IdentRegistry',

 18: ]

19:

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 21:     """

 22:     A weak ref with an associated value.

 23:     """

24:

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26:

27:

+28: class IdentRegistry(object):

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 29:     """

 30:     Maintains a unique mapping of (small) positive integer identifiers

 31:     to objects that can be weakly referenced.

32:

 33:     It is guaranteed that no two objects will have the the same

 34:     identifier at the same time, as long as those objects are

 35:     also uniquely hashable.

 36:     """

37:

+38:     def __init__(self):

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 39:         # {obj -> (ident, wref(obj))}

+40:         self._registry = WeakKeyDictionary()

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41:

 42:         # A heap of numbers that have been used and returned

+43:         self._available_idents = []

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44:

+45:     def get_ident(self, obj):

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 46:         """

 47:         Retrieve the identifier for *obj*, creating one

 48:         if necessary.

 49:         """

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+52:             return self._registry[obj][0]

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 54:             pass

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+56:         if self._available_idents:

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 57:             # Take the smallest free number

+58:             ident = heappop(self._available_idents)

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 59:         else:

 60:             # Allocate a bigger one

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