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<h1>Source code for apache_beam.transforms.combinefn_lifecycle_pipeline</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 &quot;License&quot;); 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 &quot;AS IS&quot; 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="c1"># pytype: skip-file</span>
<span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">Set</span>
<span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">Tuple</span>
<span class="kn">import</span> <span class="nn">apache_beam</span> <span class="k">as</span> <span class="nn">beam</span>
<span class="kn">from</span> <span class="nn">apache_beam.options.pipeline_options</span> <span class="kn">import</span> <span class="n">TypeOptions</span>
<span class="kn">from</span> <span class="nn">apache_beam.testing.util</span> <span class="kn">import</span> <span class="n">assert_that</span>
<span class="kn">from</span> <span class="nn">apache_beam.testing.util</span> <span class="kn">import</span> <span class="n">equal_to</span>
<span class="kn">from</span> <span class="nn">apache_beam.transforms</span> <span class="kn">import</span> <span class="n">combiners</span>
<span class="kn">from</span> <span class="nn">apache_beam.transforms</span> <span class="kn">import</span> <span class="n">trigger</span>
<span class="kn">from</span> <span class="nn">apache_beam.transforms</span> <span class="kn">import</span> <span class="n">userstate</span>
<span class="kn">from</span> <span class="nn">apache_beam.transforms</span> <span class="kn">import</span> <span class="n">window</span>
<span class="kn">from</span> <span class="nn">apache_beam.typehints</span> <span class="kn">import</span> <span class="n">with_input_types</span>
<span class="kn">from</span> <span class="nn">apache_beam.typehints</span> <span class="kn">import</span> <span class="n">with_output_types</span>
<div class="viewcode-block" id="CallSequenceEnforcingCombineFn"><a class="viewcode-back" href="../../../apache_beam.transforms.combinefn_lifecycle_pipeline.html#apache_beam.transforms.combinefn_lifecycle_pipeline.CallSequenceEnforcingCombineFn">[docs]</a><span class="nd">@with_input_types</span><span class="p">(</span><span class="nb">int</span><span class="p">)</span>
<span class="nd">@with_output_types</span><span class="p">(</span><span class="nb">int</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">CallSequenceEnforcingCombineFn</span><span class="p">(</span><span class="n">beam</span><span class="o">.</span><span class="n">CombineFn</span><span class="p">):</span>
<span class="n">instances</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span> <span class="c1"># type: Set[CallSequenceEnforcingCombineFn]</span>
<span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="fm">__init__</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_setup_called</span> <span class="o">=</span> <span class="kc">False</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_teardown_called</span> <span class="o">=</span> <span class="kc">False</span>
<div class="viewcode-block" id="CallSequenceEnforcingCombineFn.setup"><a class="viewcode-back" href="../../../apache_beam.transforms.combinefn_lifecycle_pipeline.html#apache_beam.transforms.combinefn_lifecycle_pipeline.CallSequenceEnforcingCombineFn.setup">[docs]</a> <span class="k">def</span> <span class="nf">setup</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="k">assert</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_setup_called</span><span class="p">,</span> <span class="s1">&#39;setup should not be called twice&#39;</span>
<span class="k">assert</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_teardown_called</span><span class="p">,</span> <span class="s1">&#39;setup should be called before teardown&#39;</span>
<span class="c1"># Keep track of instances so that we can check if teardown is called</span>
<span class="c1"># properly after pipeline execution.</span>
<span class="bp">self</span><span class="o">.</span><span class="n">instances</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_setup_called</span> <span class="o">=</span> <span class="kc">True</span></div>
<div class="viewcode-block" id="CallSequenceEnforcingCombineFn.create_accumulator"><a class="viewcode-back" href="../../../apache_beam.transforms.combinefn_lifecycle_pipeline.html#apache_beam.transforms.combinefn_lifecycle_pipeline.CallSequenceEnforcingCombineFn.create_accumulator">[docs]</a> <span class="k">def</span> <span class="nf">create_accumulator</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="k">assert</span> <span class="bp">self</span><span class="o">.</span><span class="n">_setup_called</span><span class="p">,</span> <span class="s1">&#39;setup should have been called&#39;</span>
<span class="k">assert</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_teardown_called</span><span class="p">,</span> <span class="s1">&#39;teardown should not have been called&#39;</span>
<span class="k">return</span> <span class="mi">0</span></div>
<div class="viewcode-block" id="CallSequenceEnforcingCombineFn.add_input"><a class="viewcode-back" href="../../../apache_beam.transforms.combinefn_lifecycle_pipeline.html#apache_beam.transforms.combinefn_lifecycle_pipeline.CallSequenceEnforcingCombineFn.add_input">[docs]</a> <span class="k">def</span> <span class="nf">add_input</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">mutable_accumulator</span><span class="p">,</span> <span class="n">element</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="k">assert</span> <span class="bp">self</span><span class="o">.</span><span class="n">_setup_called</span><span class="p">,</span> <span class="s1">&#39;setup should have been called&#39;</span>
<span class="k">assert</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_teardown_called</span><span class="p">,</span> <span class="s1">&#39;teardown should not have been called&#39;</span>
<span class="n">mutable_accumulator</span> <span class="o">+=</span> <span class="n">element</span>
<span class="k">return</span> <span class="n">mutable_accumulator</span></div>
<div class="viewcode-block" id="CallSequenceEnforcingCombineFn.add_inputs"><a class="viewcode-back" href="../../../apache_beam.transforms.combinefn_lifecycle_pipeline.html#apache_beam.transforms.combinefn_lifecycle_pipeline.CallSequenceEnforcingCombineFn.add_inputs">[docs]</a> <span class="k">def</span> <span class="nf">add_inputs</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">mutable_accumulator</span><span class="p">,</span> <span class="n">elements</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">add_input</span><span class="p">(</span><span class="n">mutable_accumulator</span><span class="p">,</span> <span class="nb">sum</span><span class="p">(</span><span class="n">elements</span><span class="p">))</span></div>
<div class="viewcode-block" id="CallSequenceEnforcingCombineFn.merge_accumulators"><a class="viewcode-back" href="../../../apache_beam.transforms.combinefn_lifecycle_pipeline.html#apache_beam.transforms.combinefn_lifecycle_pipeline.CallSequenceEnforcingCombineFn.merge_accumulators">[docs]</a> <span class="k">def</span> <span class="nf">merge_accumulators</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">accumulators</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="k">assert</span> <span class="bp">self</span><span class="o">.</span><span class="n">_setup_called</span><span class="p">,</span> <span class="s1">&#39;setup should have been called&#39;</span>
<span class="k">assert</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_teardown_called</span><span class="p">,</span> <span class="s1">&#39;teardown should not have been called&#39;</span>
<span class="k">return</span> <span class="nb">sum</span><span class="p">(</span><span class="n">accumulators</span><span class="p">)</span></div>
<div class="viewcode-block" id="CallSequenceEnforcingCombineFn.extract_output"><a class="viewcode-back" href="../../../apache_beam.transforms.combinefn_lifecycle_pipeline.html#apache_beam.transforms.combinefn_lifecycle_pipeline.CallSequenceEnforcingCombineFn.extract_output">[docs]</a> <span class="k">def</span> <span class="nf">extract_output</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">accumulator</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="k">assert</span> <span class="bp">self</span><span class="o">.</span><span class="n">_setup_called</span><span class="p">,</span> <span class="s1">&#39;setup should have been called&#39;</span>
<span class="k">assert</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_teardown_called</span><span class="p">,</span> <span class="s1">&#39;teardown should not have been called&#39;</span>
<span class="k">return</span> <span class="n">accumulator</span></div>
<div class="viewcode-block" id="CallSequenceEnforcingCombineFn.teardown"><a class="viewcode-back" href="../../../apache_beam.transforms.combinefn_lifecycle_pipeline.html#apache_beam.transforms.combinefn_lifecycle_pipeline.CallSequenceEnforcingCombineFn.teardown">[docs]</a> <span class="k">def</span> <span class="nf">teardown</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="k">assert</span> <span class="bp">self</span><span class="o">.</span><span class="n">_setup_called</span><span class="p">,</span> <span class="s1">&#39;setup should have been called&#39;</span>
<span class="k">assert</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_teardown_called</span><span class="p">,</span> <span class="s1">&#39;teardown should not be called twice&#39;</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_teardown_called</span> <span class="o">=</span> <span class="kc">True</span></div></div>
<div class="viewcode-block" id="IndexAssigningDoFn"><a class="viewcode-back" href="../../../apache_beam.transforms.combinefn_lifecycle_pipeline.html#apache_beam.transforms.combinefn_lifecycle_pipeline.IndexAssigningDoFn">[docs]</a><span class="nd">@with_input_types</span><span class="p">(</span><span class="n">Tuple</span><span class="p">[</span><span class="kc">None</span><span class="p">,</span> <span class="nb">str</span><span class="p">])</span>
<span class="nd">@with_output_types</span><span class="p">(</span><span class="n">Tuple</span><span class="p">[</span><span class="nb">int</span><span class="p">,</span> <span class="nb">str</span><span class="p">])</span>
<span class="k">class</span> <span class="nc">IndexAssigningDoFn</span><span class="p">(</span><span class="n">beam</span><span class="o">.</span><span class="n">DoFn</span><span class="p">):</span>
<span class="n">state_param</span> <span class="o">=</span> <span class="n">beam</span><span class="o">.</span><span class="n">DoFn</span><span class="o">.</span><span class="n">StateParam</span><span class="p">(</span>
<span class="n">userstate</span><span class="o">.</span><span class="n">CombiningValueStateSpec</span><span class="p">(</span>
<span class="s1">&#39;index&#39;</span><span class="p">,</span> <span class="n">beam</span><span class="o">.</span><span class="n">coders</span><span class="o">.</span><span class="n">VarIntCoder</span><span class="p">(),</span> <span class="n">CallSequenceEnforcingCombineFn</span><span class="p">()))</span>
<div class="viewcode-block" id="IndexAssigningDoFn.process"><a class="viewcode-back" href="../../../apache_beam.transforms.combinefn_lifecycle_pipeline.html#apache_beam.transforms.combinefn_lifecycle_pipeline.IndexAssigningDoFn.process">[docs]</a> <span class="k">def</span> <span class="nf">process</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">element</span><span class="p">,</span> <span class="n">state</span><span class="o">=</span><span class="n">state_param</span><span class="p">):</span>
<span class="n">_</span><span class="p">,</span> <span class="n">value</span> <span class="o">=</span> <span class="n">element</span>
<span class="n">current_index</span> <span class="o">=</span> <span class="n">state</span><span class="o">.</span><span class="n">read</span><span class="p">()</span>
<span class="k">yield</span> <span class="n">current_index</span><span class="p">,</span> <span class="n">value</span>
<span class="n">state</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span></div></div>
<div class="viewcode-block" id="run_combine"><a class="viewcode-back" href="../../../apache_beam.transforms.combinefn_lifecycle_pipeline.html#apache_beam.transforms.combinefn_lifecycle_pipeline.run_combine">[docs]</a><span class="k">def</span> <span class="nf">run_combine</span><span class="p">(</span><span class="n">pipeline</span><span class="p">,</span> <span class="n">input_elements</span><span class="o">=</span><span class="mi">5</span><span class="p">,</span> <span class="n">lift_combiners</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
<span class="c1"># Calculate the expected result, which is the sum of an arithmetic sequence.</span>
<span class="c1"># By default, this is equal to: 0 + 1 + 2 + 3 + 4 = 10</span>
<span class="n">expected_result</span> <span class="o">=</span> <span class="n">input_elements</span> <span class="o">*</span> <span class="p">(</span><span class="n">input_elements</span> <span class="o">-</span> <span class="mi">1</span><span class="p">)</span> <span class="o">/</span> <span class="mi">2</span>
<span class="c1"># Enable runtime type checking in order to cover TypeCheckCombineFn by</span>
<span class="c1"># the test.</span>
<span class="n">pipeline</span><span class="o">.</span><span class="n">get_pipeline_options</span><span class="p">()</span><span class="o">.</span><span class="n">view_as</span><span class="p">(</span><span class="n">TypeOptions</span><span class="p">)</span><span class="o">.</span><span class="n">runtime_type_check</span> <span class="o">=</span> <span class="kc">True</span>
<span class="n">pipeline</span><span class="o">.</span><span class="n">get_pipeline_options</span><span class="p">()</span><span class="o">.</span><span class="n">view_as</span><span class="p">(</span>
<span class="n">TypeOptions</span><span class="p">)</span><span class="o">.</span><span class="n">allow_unsafe_triggers</span> <span class="o">=</span> <span class="kc">True</span>
<span class="k">with</span> <span class="n">pipeline</span> <span class="k">as</span> <span class="n">p</span><span class="p">:</span>
<span class="n">pcoll</span> <span class="o">=</span> <span class="n">p</span> <span class="o">|</span> <span class="s1">&#39;Start&#39;</span> <span class="o">&gt;&gt;</span> <span class="n">beam</span><span class="o">.</span><span class="n">Create</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="n">input_elements</span><span class="p">))</span>
<span class="c1"># Certain triggers, such as AfterCount, are incompatible with combiner</span>
<span class="c1"># lifting. We can use that fact to prevent combiners from being lifted.</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">lift_combiners</span><span class="p">:</span>
<span class="n">pcoll</span> <span class="o">|=</span> <span class="n">beam</span><span class="o">.</span><span class="n">WindowInto</span><span class="p">(</span>
<span class="n">window</span><span class="o">.</span><span class="n">GlobalWindows</span><span class="p">(),</span>
<span class="n">trigger</span><span class="o">=</span><span class="n">trigger</span><span class="o">.</span><span class="n">AfterCount</span><span class="p">(</span><span class="n">input_elements</span><span class="p">),</span>
<span class="n">accumulation_mode</span><span class="o">=</span><span class="n">trigger</span><span class="o">.</span><span class="n">AccumulationMode</span><span class="o">.</span><span class="n">DISCARDING</span><span class="p">)</span>
<span class="c1"># Pass an additional &#39;None&#39; in order to cover _CurriedFn by the test.</span>
<span class="n">pcoll</span> <span class="o">|=</span> <span class="s1">&#39;Do&#39;</span> <span class="o">&gt;&gt;</span> <span class="n">beam</span><span class="o">.</span><span class="n">CombineGlobally</span><span class="p">(</span>
<span class="n">combiners</span><span class="o">.</span><span class="n">SingleInputTupleCombineFn</span><span class="p">(</span>
<span class="n">CallSequenceEnforcingCombineFn</span><span class="p">(),</span> <span class="n">CallSequenceEnforcingCombineFn</span><span class="p">()),</span>
<span class="kc">None</span><span class="p">)</span><span class="o">.</span><span class="n">with_fanout</span><span class="p">(</span><span class="n">fanout</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span><span class="n">pcoll</span><span class="p">,</span> <span class="n">equal_to</span><span class="p">([(</span><span class="n">expected_result</span><span class="p">,</span> <span class="n">expected_result</span><span class="p">)]))</span></div>
<div class="viewcode-block" id="run_pardo"><a class="viewcode-back" href="../../../apache_beam.transforms.combinefn_lifecycle_pipeline.html#apache_beam.transforms.combinefn_lifecycle_pipeline.run_pardo">[docs]</a><span class="k">def</span> <span class="nf">run_pardo</span><span class="p">(</span><span class="n">pipeline</span><span class="p">,</span> <span class="n">input_elements</span><span class="o">=</span><span class="mi">10</span><span class="p">):</span>
<span class="k">with</span> <span class="n">pipeline</span> <span class="k">as</span> <span class="n">p</span><span class="p">:</span>
<span class="n">_</span> <span class="o">=</span> <span class="p">(</span>
<span class="n">p</span>
<span class="o">|</span> <span class="s1">&#39;Start&#39;</span> <span class="o">&gt;&gt;</span> <span class="n">beam</span><span class="o">.</span><span class="n">Create</span><span class="p">((</span><span class="s1">&#39;Hello&#39;</span> <span class="k">for</span> <span class="n">_</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">input_elements</span><span class="p">)))</span>
<span class="o">|</span> <span class="s1">&#39;KeyWithNone&#39;</span> <span class="o">&gt;&gt;</span> <span class="n">beam</span><span class="o">.</span><span class="n">Map</span><span class="p">(</span><span class="k">lambda</span> <span class="n">elem</span><span class="p">:</span> <span class="p">(</span><span class="kc">None</span><span class="p">,</span> <span class="n">elem</span><span class="p">))</span>
<span class="o">|</span> <span class="s1">&#39;Do&#39;</span> <span class="o">&gt;&gt;</span> <span class="n">beam</span><span class="o">.</span><span class="n">ParDo</span><span class="p">(</span><span class="n">IndexAssigningDoFn</span><span class="p">()))</span></div>
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