37 lines
1.2 KiB
Python
37 lines
1.2 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
# not use this file except in compliance with the License. You may obtain
|
|
# a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
|
|
|
|
class Partitioner(object):
|
|
"""
|
|
Base class for a partitioner
|
|
"""
|
|
def __init__(self, partitions):
|
|
"""
|
|
Initialize the partitioner
|
|
|
|
Arguments:
|
|
partitions: A list of available partitions (during startup)
|
|
"""
|
|
self.partitions = partitions
|
|
|
|
def partition(self, key, partitions=None):
|
|
"""
|
|
Takes a string key and num_partitions as argument and returns
|
|
a partition to be used for the message
|
|
|
|
Arguments:
|
|
key: the key to use for partitioning
|
|
partitions: (optional) a list of partitions.
|
|
"""
|
|
raise NotImplementedError('partition function has to be implemented')
|