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import multiprocess
class Counter:
"""A multi-process compatible counter."""
def __init__(self, name):
self._val = multiprocess.Value("i", 0)
self._name = name
def __eq__(self, other):
return self.__cmp__(other) == 0
def __ne__(self, other):
return self.__cmp__(other) != 0
def __gt__(self, other):
return self.__cmp__(other) > 0
def __ge__(self, other):
return self.__cmp__(other) >= 0
def __lt__(self, other):
return self.__cmp__(other) < 0
def __le__(self, other):
return self.__cmp__(other) <= 0
def __cmp__(self, other):
if isinstance(other, Counter):
other = other.value
if not isinstance(other, int):
raise TypeError(other)
if self._val.value == other:
return 0
elif self._val.value > other:
return 1
return -1
def __repr__(self):
return "<Counter %d>" % self._val.value
def __iadd__(self, other):
self.__add__(other)
return self
def __isub__(self, other):
self.__sub__(other)
return self
def __add__(self, other):
with self._val.get_lock():
if isinstance(other, Counter):
other = other.value
if not isinstance(other, int):
raise NotImplementedError()
self._val.value += other
def __sub__(self, other):
self.__add__(-other)
@property
def value(self):
return self._val.value
@value.setter
def value(self, _value):
with self._val.get_lock():
if isinstance(_value, Counter):
_value = _value.value
if not isinstance(_value, int):
raise TypeError(_value)
self._val.value = _value
class Counters:
"""Mapping of Counter items."""
def __init__(self, *keys):
self._counters = {}
for key in keys:
self._counters[key] = Counter(key)
def to_dict(self):
return {key: value.value for key, value in self._counters.items()}
def items(self):
return self._counters.items()
def values(self):
return self._counters.values()
def __iter__(self):
return self._counters.__iter__()
def keys(self):
return self._counters.keys()
def __contains__(self, key):
return key in self._counters
def __repr__(self):
return repr(self._counters)
def __setitem__(self, key, value):
if key not in self._counters:
raise KeyError(key)
self._counters[key].value = value
def __getitem__(self, key):
return self._counters[key]
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