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| <h1>Source code for apache_beam.transforms.timeutil</h1><div class="highlight"><pre> |
| <span></span><span class="c1">#</span> |
| <span class="c1"># Licensed to the Apache Software Foundation (ASF) under one or more</span> |
| <span class="c1"># contributor license agreements. See the NOTICE file distributed with</span> |
| <span class="c1"># this work for additional information regarding copyright ownership.</span> |
| <span class="c1"># The ASF licenses this file to You under the Apache License, Version 2.0</span> |
| <span class="c1"># (the "License"); you may not use this file except in compliance with</span> |
| <span class="c1"># the License. You may obtain a copy of the License at</span> |
| <span class="c1">#</span> |
| <span class="c1"># http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="c1">#</span> |
| <span class="c1"># Unless required by applicable law or agreed to in writing, software</span> |
| <span class="c1"># distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="c1"># WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="c1"># See the License for the specific language governing permissions and</span> |
| <span class="c1"># limitations under the License.</span> |
| <span class="c1">#</span> |
| |
| <span class="sd">"""Timestamp utilities."""</span> |
| |
| <span class="kn">from</span> <span class="nn">__future__</span> <span class="k">import</span> <span class="n">absolute_import</span> |
| |
| <span class="kn">from</span> <span class="nn">abc</span> <span class="k">import</span> <span class="n">ABCMeta</span> |
| <span class="kn">from</span> <span class="nn">abc</span> <span class="k">import</span> <span class="n">abstractmethod</span> |
| |
| <span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span> |
| <span class="s1">'TimeDomain'</span><span class="p">,</span> |
| <span class="p">]</span> |
| |
| |
| <div class="viewcode-block" id="TimeDomain"><a class="viewcode-back" href="../../../apache_beam.transforms.timeutil.html#apache_beam.transforms.timeutil.TimeDomain">[docs]</a><span class="k">class</span> <span class="nc">TimeDomain</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span> |
| <span class="sd">"""Time domain for streaming timers."""</span> |
| |
| <span class="n">WATERMARK</span> <span class="o">=</span> <span class="s1">'WATERMARK'</span> |
| <span class="n">REAL_TIME</span> <span class="o">=</span> <span class="s1">'REAL_TIME'</span> |
| <span class="n">DEPENDENT_REAL_TIME</span> <span class="o">=</span> <span class="s1">'DEPENDENT_REAL_TIME'</span> |
| |
| <div class="viewcode-block" id="TimeDomain.from_string"><a class="viewcode-back" href="../../../apache_beam.transforms.timeutil.html#apache_beam.transforms.timeutil.TimeDomain.from_string">[docs]</a> <span class="nd">@staticmethod</span> |
| <span class="k">def</span> <span class="nf">from_string</span><span class="p">(</span><span class="n">domain</span><span class="p">):</span> |
| <span class="k">if</span> <span class="n">domain</span> <span class="ow">in</span> <span class="p">(</span><span class="n">TimeDomain</span><span class="o">.</span><span class="n">WATERMARK</span><span class="p">,</span> |
| <span class="n">TimeDomain</span><span class="o">.</span><span class="n">REAL_TIME</span><span class="p">,</span> |
| <span class="n">TimeDomain</span><span class="o">.</span><span class="n">DEPENDENT_REAL_TIME</span><span class="p">):</span> |
| <span class="k">return</span> <span class="n">domain</span> |
| <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">'Unknown time domain: </span><span class="si">%s</span><span class="s1">'</span> <span class="o">%</span> <span class="n">domain</span><span class="p">)</span></div></div> |
| |
| |
| <span class="k">class</span> <span class="nc">TimestampCombinerImpl</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span> |
| <span class="sd">"""Implementation of TimestampCombiner."""</span> |
| |
| <span class="n">__metaclass__</span> <span class="o">=</span> <span class="n">ABCMeta</span> |
| |
| <span class="nd">@abstractmethod</span> |
| <span class="k">def</span> <span class="nf">assign_output_time</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">window</span><span class="p">,</span> <span class="n">input_timestamp</span><span class="p">):</span> |
| <span class="k">pass</span> |
| |
| <span class="nd">@abstractmethod</span> |
| <span class="k">def</span> <span class="nf">combine</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">output_timestamp</span><span class="p">,</span> <span class="n">other_output_timestamp</span><span class="p">):</span> |
| <span class="k">pass</span> |
| |
| <span class="k">def</span> <span class="nf">combine_all</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">merging_timestamps</span><span class="p">):</span> |
| <span class="sd">"""Apply combine to list of timestamps."""</span> |
| <span class="n">combined_output_time</span> <span class="o">=</span> <span class="kc">None</span> |
| <span class="k">for</span> <span class="n">output_time</span> <span class="ow">in</span> <span class="n">merging_timestamps</span><span class="p">:</span> |
| <span class="k">if</span> <span class="n">combined_output_time</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span> |
| <span class="n">combined_output_time</span> <span class="o">=</span> <span class="n">output_time</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="n">combined_output_time</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">combine</span><span class="p">(</span> |
| <span class="n">combined_output_time</span><span class="p">,</span> <span class="n">output_time</span><span class="p">)</span> |
| <span class="k">return</span> <span class="n">combined_output_time</span> |
| |
| <span class="k">def</span> <span class="nf">merge</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">unused_result_window</span><span class="p">,</span> <span class="n">merging_timestamps</span><span class="p">):</span> |
| <span class="sd">"""Default to returning the result of combine_all."""</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">combine_all</span><span class="p">(</span><span class="n">merging_timestamps</span><span class="p">)</span> |
| |
| |
| <span class="k">class</span> <span class="nc">DependsOnlyOnWindow</span><span class="p">(</span><span class="n">TimestampCombinerImpl</span><span class="p">):</span> |
| <span class="sd">"""TimestampCombinerImpl that only depends on the window."""</span> |
| |
| <span class="n">__metaclass__</span> <span class="o">=</span> <span class="n">ABCMeta</span> |
| |
| <span class="k">def</span> <span class="nf">combine</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">output_timestamp</span><span class="p">,</span> <span class="n">other_output_timestamp</span><span class="p">):</span> |
| <span class="k">return</span> <span class="n">output_timestamp</span> |
| |
| <span class="k">def</span> <span class="nf">merge</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">result_window</span><span class="p">,</span> <span class="n">unused_merging_timestamps</span><span class="p">):</span> |
| <span class="c1"># Since we know that the result only depends on the window, we can ignore</span> |
| <span class="c1"># the given timestamps.</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">assign_output_time</span><span class="p">(</span><span class="n">result_window</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> |
| |
| |
| <span class="k">class</span> <span class="nc">OutputAtEarliestInputTimestampImpl</span><span class="p">(</span><span class="n">TimestampCombinerImpl</span><span class="p">):</span> |
| <span class="sd">"""TimestampCombinerImpl outputting at earliest input timestamp."""</span> |
| |
| <span class="k">def</span> <span class="nf">assign_output_time</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">window</span><span class="p">,</span> <span class="n">input_timestamp</span><span class="p">):</span> |
| <span class="k">return</span> <span class="n">input_timestamp</span> |
| |
| <span class="k">def</span> <span class="nf">combine</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">output_timestamp</span><span class="p">,</span> <span class="n">other_output_timestamp</span><span class="p">):</span> |
| <span class="sd">"""Default to returning the earlier of two timestamps."""</span> |
| <span class="k">return</span> <span class="nb">min</span><span class="p">(</span><span class="n">output_timestamp</span><span class="p">,</span> <span class="n">other_output_timestamp</span><span class="p">)</span> |
| |
| |
| <span class="k">class</span> <span class="nc">OutputAtEarliestTransformedInputTimestampImpl</span><span class="p">(</span><span class="n">TimestampCombinerImpl</span><span class="p">):</span> |
| <span class="sd">"""TimestampCombinerImpl outputting at earliest input timestamp."""</span> |
| |
| <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">window_fn</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">window_fn</span> <span class="o">=</span> <span class="n">window_fn</span> |
| |
| <span class="k">def</span> <span class="nf">assign_output_time</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">window</span><span class="p">,</span> <span class="n">input_timestamp</span><span class="p">):</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">window_fn</span><span class="o">.</span><span class="n">get_transformed_output_time</span><span class="p">(</span><span class="n">window</span><span class="p">,</span> <span class="n">input_timestamp</span><span class="p">)</span> |
| |
| <span class="k">def</span> <span class="nf">combine</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">output_timestamp</span><span class="p">,</span> <span class="n">other_output_timestamp</span><span class="p">):</span> |
| <span class="k">return</span> <span class="nb">min</span><span class="p">(</span><span class="n">output_timestamp</span><span class="p">,</span> <span class="n">other_output_timestamp</span><span class="p">)</span> |
| |
| |
| <span class="k">class</span> <span class="nc">OutputAtLatestInputTimestampImpl</span><span class="p">(</span><span class="n">TimestampCombinerImpl</span><span class="p">):</span> |
| <span class="sd">"""TimestampCombinerImpl outputting at latest input timestamp."""</span> |
| |
| <span class="k">def</span> <span class="nf">assign_output_time</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">window</span><span class="p">,</span> <span class="n">input_timestamp</span><span class="p">):</span> |
| <span class="k">return</span> <span class="n">input_timestamp</span> |
| |
| <span class="k">def</span> <span class="nf">combine</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">output_timestamp</span><span class="p">,</span> <span class="n">other_output_timestamp</span><span class="p">):</span> |
| <span class="k">return</span> <span class="nb">max</span><span class="p">(</span><span class="n">output_timestamp</span><span class="p">,</span> <span class="n">other_output_timestamp</span><span class="p">)</span> |
| |
| |
| <span class="k">class</span> <span class="nc">OutputAtEndOfWindowImpl</span><span class="p">(</span><span class="n">DependsOnlyOnWindow</span><span class="p">):</span> |
| <span class="sd">"""TimestampCombinerImpl outputting at end of window."""</span> |
| |
| <span class="k">def</span> <span class="nf">assign_output_time</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">window</span><span class="p">,</span> <span class="n">unused_input_timestamp</span><span class="p">):</span> |
| <span class="k">return</span> <span class="n">window</span><span class="o">.</span><span class="n">end</span> |
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