#

# Licensed to the Apache Software Foundation (ASF) under one or more

# contributor license agreements. See the NOTICE file distributed with

# this work for additional information regarding copyright ownership.

# The ASF licenses this file to You 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.

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"""Clock implementations for real time processing and testing.

For internal use only. No backwards compatibility guarantees.

"""

# pytype: skip-file

import time

from apache_beam.utils.timestamp import Timestamp

class Clock(object):

def time(self):

"""Returns the number of seconds since epoch."""

raise NotImplementedError()

def advance_time(self, advance_by):

"""Advances the clock by a number of seconds."""

raise NotImplementedError()

class RealClock(object):

def time(self):

return time.time()

class TestClock(object):

"""Clock used for Testing"""

def __init__(self, current_time=None):

self._current_time = current_time if current_time else Timestamp()

def time(self):

return float(self._current_time)

def advance_time(self, advance_by):

self._current_time += advance_by