github.com/apache/beam/sdks/v2@v2.48.2/python/apache_beam/runners/direct/clock.py (about)

     1  #
     2  # Licensed to the Apache Software Foundation (ASF) under one or more
     3  # contributor license agreements.  See the NOTICE file distributed with
     4  # this work for additional information regarding copyright ownership.
     5  # The ASF licenses this file to You under the Apache License, Version 2.0
     6  # (the "License"); you may not use this file except in compliance with
     7  # the License.  You may obtain a copy of the License at
     8  #
     9  #    http://www.apache.org/licenses/LICENSE-2.0
    10  #
    11  # Unless required by applicable law or agreed to in writing, software
    12  # distributed under the License is distributed on an "AS IS" BASIS,
    13  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14  # See the License for the specific language governing permissions and
    15  # limitations under the License.
    16  #
    17  
    18  """Clock implementations for real time processing and testing.
    19  
    20  For internal use only. No backwards compatibility guarantees.
    21  """
    22  # pytype: skip-file
    23  
    24  import time
    25  
    26  from apache_beam.utils.timestamp import Timestamp
    27  
    28  
    29  class Clock(object):
    30    def time(self):
    31      """Returns the number of seconds since epoch."""
    32      raise NotImplementedError()
    33  
    34    def advance_time(self, advance_by):
    35      """Advances the clock by a number of seconds."""
    36      raise NotImplementedError()
    37  
    38  
    39  class RealClock(object):
    40    def time(self):
    41      return time.time()
    42  
    43  
    44  class TestClock(object):
    45    """Clock used for Testing"""
    46    def __init__(self, current_time=None):
    47      self._current_time = current_time if current_time else Timestamp()
    48  
    49    def time(self):
    50      return float(self._current_time)
    51  
    52    def advance_time(self, advance_by):
    53      self._current_time += advance_by