def __init__(self,
partition_key_extractor,
collection_links,
default_number_of_virtual_nodes_per_collection=128,
hash_generator=None):
"""
:Parameters:
- `partition_key_extractor`: lambda, returning the partition key from the document passed.
- `collection_links`: list, the links of collections participating in partitioning.
- `default_number_of_virtual_nodes_per_collection`: int, number of virtual nodes per collection.
- `hash_generator`: HashGenerator, the hash generator to be used for hashing algorithm.
"""
if partition_key_extractor is None:
raise ValueError("partition_key_extractor is None.")
if collection_links is None:
raise ValueError("collection_links is None.")
if default_number_of_virtual_nodes_per_collection <= 0:
raise ValueError(
"The number of virtual nodes per collection must greater than 0."
)
self.partition_key_extractor = partition_key_extractor
self.collection_links = collection_links
if hash_generator is None:
hash_generator = murmur_hash._MurmurHash()
self.consistent_hash_ring = consistent_hash_ring._ConsistentHashRing(
self.collection_links,
default_number_of_virtual_nodes_per_collection, hash_generator)
def __init__(self, partition_key_extractor, collection_links, default_number_of_virtual_nodes_per_collection = 128, hash_generator = None):
"""
:Parameters:
- `partition_key_extractor`: lambda, returning the partition key from the document passed.
- `collection_links`: list, the links of collections participating in partitioning.
- `default_number_of_virtual_nodes_per_collection`: int, number of virtual nodes per collection.
- `hash_generator`: HashGenerator, the hash generator to be used for hashing algorithm.
"""
if partition_key_extractor is None:
raise ValueError("partition_key_extractor is None.")
if collection_links is None:
raise ValueError("collection_links is None.")
if default_number_of_virtual_nodes_per_collection <= 0:
raise ValueError("The number of virtual nodes per collection must greater than 0.")
self.partition_key_extractor = partition_key_extractor
self.collection_links = collection_links
if hash_generator is None:
hash_generator = murmur_hash._MurmurHash()
self.consistent_hash_ring = consistent_hash_ring._ConsistentHashRing(self.collection_links, default_number_of_virtual_nodes_per_collection, hash_generator)