# SPDX-License-Identifier: Apache-2.0
#
# The OpenSearch Contributors require contributions made to
# this file be licensed under the Apache-2.0 license or a
# compatible open source license.
#
# Modifications Copyright OpenSearch Contributors. See
# GitHub history for details.
from abc import ABC, abstractmethod
from typing import Optional
class Metrics(ABC):
"""
The Metrics class defines methods and properties for managing
request metrics, including start time, end time, and service time,
serving as a blueprint for concrete implementations.
"""
@abstractmethod
def request_start(self) -> None:
pass
@abstractmethod
def request_end(self) -> None:
pass
@property
@abstractmethod
def start_time(self) -> Optional[float]:
pass
@property
@abstractmethod
def end_time(self) -> Optional[float]:
pass
@property
@abstractmethod
def service_time(self) -> Optional[float]:
pass