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from abc import abstractmethod
from typing import Any, Callable, List
from overrides import EnforceOverrides, overrides
from chromadb.config import Component, System
from chromadb.types import Segment
class SegmentDirectory(Component):
"""A segment directory is a data interface that manages the location of segments. Concretely, this
means that for clustered chroma, it provides the grpc endpoint for a segment."""
@abstractmethod
def get_segment_endpoint(self, segment: Segment) -> str:
"""Return the segment residence for a given segment ID"""
@abstractmethod
def register_updated_segment_callback(
self, callback: Callable[[Segment], None]
) -> None:
"""Register a callback that will be called when a segment is updated"""
pass
Memberlist = List[str]
class MemberlistProvider(Component, EnforceOverrides):
"""Returns the latest memberlist and provdes a callback for when it changes. This
callback may be called from a different thread than the one that called. Callers should ensure
that they are thread-safe."""
callbacks: List[Callable[[Memberlist], Any]]
def __init__(self, system: System):
self.callbacks = []
super().__init__(system)
@abstractmethod
def get_memberlist(self) -> Memberlist:
"""Returns the latest memberlist"""
pass
@abstractmethod
def set_memberlist_name(self, memberlist: str) -> None:
"""Sets the memberlist that this provider will watch"""
pass
@overrides
def stop(self) -> None:
"""Stops watching the memberlist"""
self.callbacks = []
def register_updated_memberlist_callback(
self, callback: Callable[[Memberlist], Any]
) -> None:
"""Registers a callback that will be called when the memberlist changes. May be called many times
with the same memberlist, so callers should be idempotent. May be called from a different thread.
"""
self.callbacks.append(callback)
def unregister_updated_memberlist_callback(
self, callback: Callable[[Memberlist], Any]
) -> bool:
"""Unregisters a callback that was previously registered. Returns True if the callback was
successfully unregistered, False if it was not ever registered."""
if callback in self.callbacks:
self.callbacks.remove(callback)
return True
return False
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