def I_insert0(self, item):
"""
Insert an item into the filter.
:param item: Item to be inserted.
:return: True if insert is successful; CuckooFilterFullException if
filter is full.
"""
fingerprint = hashutils_builtin.fingerprint(item,
self.fingerprint_size)
i = self._get_index(item)
j = self._get_alternate3_index(i, fingerprint)
if self.buckets[i].insert(fingerprint) \
or self.buckets[j].insert(fingerprint):
self.size += 1
return True
eviction_index = random.choice([i, j])
for _ in range(self.max_displacements):
self.kicks += 1
f = self.buckets[eviction_index].swap(fingerprint)
eviction_index = self._get_alternate3_index(eviction_index, f)
if self.buckets[eviction_index].insert(f):
self.size += 1
return True
fingerprint = f # 我自己感觉fingerprint没有改变，有问题，然后我加上了这行代码
# Filter is full
return self.size, self.kicks
def delete2(self, item):
"""
Delete an item from the filter.
To delete an item safely, it must have been previously inserted.
Otherwise, deleting a non-inserted item might unintentionally remove
a real, different item that happens to share the same fingerprint.
:param item: Item to delete from the filter.
:return: True, if item is found and deleted; False, otherwise.
"""
fingerprint = hashutils_builtin.fingerprint(item,
size=self.fingerprint_size)
i = self._get_index(item)
j = self._get_alternate1_index(i, fingerprint)
x = self._get_alternate2_index(i, fingerprint)
y = self._get_alternate3_index(i, fingerprint)
if self.buckets[i].delete(fingerprint):
return True
elif self.buckets[y].delete(fingerprint):
return True
elif self.buckets[j].delete(fingerprint):
return True
elif self.buckets[x].delete(fingerprint):
return True
else:
return False
def D_contains(self, item, threshold1, threshold2):
"""
Check if the filter contains the item.
:param item: Item to check its presence in the filter.
:return: True, if item is in the filter; False, otherwise.
"""
fingerprint = hashutils_builtin.fingerprint(item,
self.fingerprint_size)
if fingerprint >= threshold1 and fingerprint <= threshold2:
i = self._get_index(item)
j = self._get_alternate1_index(i, fingerprint)
x = self._get_alternate2_index(i, fingerprint)
y = self._get_alternate3_index(i, fingerprint)
if fingerprint in self.buckets[i]:
return True
elif fingerprint in self.buckets[y]:
return True
elif fingerprint in self.buckets[j]:
return True
elif fingerprint in self.buckets[x]:
return True
else:
return False
else:
i = self._get_index(item)
j = self._get_alternate3_index(i, fingerprint)
return fingerprint in self.buckets[
i] or fingerprint in self.buckets[j]
def I_contains0(self, item):
"""
Check if the filter contains the item.
:param item: Item to check its presence in the filter.
:return: True, if item is in the filter; False, otherwise.
"""
fingerprint = hashutils_builtin.fingerprint(item,
self.fingerprint_size)
i = self._get_index(item)
j = self._get_alternate3_index(i, fingerprint)
return fingerprint in self.buckets[i] or fingerprint in self.buckets[j]
def D_insert(self, item, threshold1, threshold2):
"""
Insert an item into the filter.
:param item: Item to be inserted.
:return: True if insert is successful; CuckooFilterFullException if
filter is full.
"""
# 处于阈值区间则采用4个候选桶进行存储,注意：threshold1不能小于255，threshold2不能大于65280
fingerprint = hashutils_builtin.fingerprint(item,
self.fingerprint_size)
if fingerprint >= threshold1 and fingerprint <= threshold2:
i = self._get_index(item)
j = self._get_alternate1_index(i, fingerprint)
x = self._get_alternate2_index(i, fingerprint)
y = self._get_alternate3_index(i, fingerprint)
if self.buckets[i].insert(fingerprint):
self.size += 1
return True
elif self.buckets[y].insert(fingerprint):
self.size += 1
return True
elif self.buckets[j].insert(fingerprint):
self.size += 1
return True
elif self.buckets[x].insert(fingerprint):
self.size += 1
return True
eviction_index = random.choice([i, j, x, y])
for _ in range(self.max_displacements):
self.kicks += 1
f = self.buckets[eviction_index].swap(fingerprint)
# 若交换得到的指纹值位于阈值区间，则4个桶
if f >= threshold1 and f <= threshold2:
eviction_index1 = self._get_alternate1_index(
eviction_index, f)
eviction_index2 = self._get_alternate2_index(
eviction_index, f)
eviction_index3 = self._get_alternate3_index(
eviction_index, f)
if self.buckets[eviction_index3].insert(f):
self.size += 1
return True
elif self.buckets[eviction_index1].insert(f):
self.size += 1
return True
elif self.buckets[eviction_index2].insert(f):
self.size += 1
return True
eviction_index = random.choice(
[eviction_index1, eviction_index2, eviction_index3])
fingerprint = f
else:
eviction_index = self._get_alternate3_index(
eviction_index, f)
if self.buckets[eviction_index].insert(f):
self.size += 1
return True
fingerprint = f
# Filter is full
return self.size, self.kicks
# raise exceptions.CuckooFilterFullException('Insert operation failed. '
# 'Filter is full.')
# 否则采用2个候选桶存储
else:
i = self._get_index(item)
j = self._get_alternate3_index(i, fingerprint)
if self.buckets[i].insert(fingerprint) \
or self.buckets[j].insert(fingerprint):
self.size += 1
return True
eviction_index = random.choice([i, j])
for _ in range(self.max_displacements):
self.kicks += 1
f = self.buckets[eviction_index].swap(fingerprint)
# 如果交换的指纹值位于阈值区间，则扩展到4个桶
if f >= threshold1 and f <= threshold2:
eviction_index1 = self._get_alternate1_index(
eviction_index, f)
eviction_index2 = self._get_alternate2_index(
eviction_index, f)
eviction_index3 = self._get_alternate3_index(
eviction_index, f)
if self.buckets[eviction_index3].insert(f):
self.size += 1
return True
elif self.buckets[eviction_index1].insert(f):
self.size += 1
return True
elif self.buckets[eviction_index2].insert(f):
self.size += 1
return True
eviction_index = random.choice(
[eviction_index1, eviction_index2, eviction_index3])
fingerprint = f
# 否则，还是两个桶
else:
eviction_index = self._get_alternate3_index(
eviction_index, f)
if self.buckets[eviction_index].insert(f):
self.size += 1
return True
fingerprint = f
# Filter is full
return self.size, self.kicks
def I_insert7(self, item):
"""
Insert an item into the filter.
:param item: Item to be inserted.
:return: True if insert is successful; CuckooFilterFullException if
filter is full.
"""
fingerprint = hashutils_builtin.fingerprint(item,
self.fingerprint_size)
i = self._get_index(item)
j = self._get_alternate1_index(i, fingerprint)
x = self._get_alternate2_index(i, fingerprint)
y = self._get_alternate3_index(i, fingerprint)
if i == j or x: # 候选桶扩展失败
if self.buckets[i].insert(fingerprint) \
or self.buckets[y].insert(fingerprint):
self.size += 1
return True
if i != j or x: # 候选桶扩展成功
if self.buckets[i].insert(fingerprint):
self.size += 1
return True
elif self.buckets[y].insert(fingerprint):
self.size += 1
return True
elif self.buckets[j].insert(fingerprint):
self.size += 1
return True
elif self.buckets[x].insert(fingerprint):
self.size += 1
return True
eviction_index = random.choice([i, j, x, y])
for _ in range(self.max_displacements):
self.kicks += 1
f = self.buckets[eviction_index].swap(fingerprint)
eviction_index1 = self._get_alternate1_index(eviction_index, f)
eviction_index2 = self._get_alternate2_index(eviction_index, f)
eviction_index3 = self._get_alternate3_index(eviction_index, f)
if eviction_index == eviction_index2 or eviction_index1: # 扩展候选桶失败
if self.buckets[eviction_index3].insert(f):
self.size += 1
return True
eviction_index = eviction_index3
if eviction_index != eviction_index2 or eviction_index1: # 扩展候选桶成功
if self.buckets[eviction_index3].insert(f):
self.size += 1
return True
elif self.buckets[eviction_index1].insert(f):
self.size += 1
return True
elif self.buckets[eviction_index2].insert(f):
self.size += 1
return True
eviction_index = random.choice(
[eviction_index1, eviction_index2, eviction_index3])
fingerprint = f # 源码有问题，这一条代码还是得加上，不然导致重复插入初始的fingerprint，查询时会有问题
# Filter is full
return self.size, self.kicks