| #!/usr/bin/env python |
| # -*- encoding: utf-8 -*- |
| |
| # Copyright 2016 - Twitter, Inc. |
| # |
| # 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. |
| '''windowconfig.py: module for defining windowconfig''' |
| |
| import datetime |
| |
| class WindowConfig(object): |
| """WindowConfig allows streamlet API users to program window configuration for operations |
| that rely on windowing. Currently we only support time/count based |
| sliding/tumbling windows. |
| """ |
| def __init__(self, window_duration, slide_interval): |
| self._window_duration = window_duration |
| self._slide_interval = slide_interval |
| if self._window_duration.microseconds > 0 or self._slide_interval.microseconds > 0: |
| raise RuntimeError("Python Windowing curently only supports second resolution") |
| |
| @staticmethod |
| def create_tumbling_window(window_duration): |
| return WindowConfig(window_duration, window_duration) |
| |
| @staticmethod |
| def create_sliding_window(window_duration, slide_interval): |
| if isinstance(window_duration, int): |
| window_duration = datetime.timedelta(seconds=window_duration) |
| if isinstance(slide_interval, int): |
| slide_interval = datetime.timedelta(seconds=slide_interval) |
| if not isinstance(window_duration, datetime.timedelta): |
| raise RuntimeError("Window Duration has to be of type datetime.timedelta") |
| if not isinstance(slide_interval, datetime.timedelta): |
| raise RuntimeError("Slide Interval has to be of type datetime.timedelta") |
| return WindowConfig(window_duration, slide_interval) |