24 lines
720 B
Python
24 lines
720 B
Python
from itertools import cycle
|
|
|
|
from .base import Partitioner
|
|
|
|
class RoundRobinPartitioner(Partitioner):
|
|
"""
|
|
Implements a round robin partitioner which sends data to partitions
|
|
in a round robin fashion
|
|
"""
|
|
def __init__(self, partitions):
|
|
super(RoundRobinPartitioner, self).__init__(partitions)
|
|
self.iterpart = cycle(partitions)
|
|
|
|
def _set_partitions(self, partitions):
|
|
self.partitions = partitions
|
|
self.iterpart = cycle(partitions)
|
|
|
|
def partition(self, key, partitions=None):
|
|
# Refresh the partition list if necessary
|
|
if partitions and self.partitions != partitions:
|
|
self._set_partitions(partitions)
|
|
|
|
return next(self.iterpart)
|