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from __future__ import absolute_import
import abc
import logging
log = logging.getLogger(__name__)
class AbstractPartitionAssignor(object):
"""
Abstract assignor implementation which does some common grunt work (in particular collecting
partition counts which are always needed in assignors).
"""
@abc.abstractproperty
def name(self):
""".name should be a string identifying the assignor"""
pass
@abc.abstractmethod
def assign(self, cluster, members):
"""Perform group assignment given cluster metadata and member subscriptions
Arguments:
cluster (ClusterMetadata): metadata for use in assignment
members (dict of {member_id: MemberMetadata}): decoded metadata for
each member in the group.
Returns:
dict: {member_id: MemberAssignment}
"""
pass
@abc.abstractmethod
def metadata(self, topics):
"""Generate ProtocolMetadata to be submitted via JoinGroupRequest.
Arguments:
topics (set): a member's subscribed topics
Returns:
MemberMetadata struct
"""
pass
@abc.abstractmethod
def on_assignment(self, assignment):
"""Callback that runs on each assignment.
This method can be used to update internal state, if any, of the
partition assignor.
Arguments:
assignment (MemberAssignment): the member's assignment
"""
pass
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