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<h1>Source code for apache_beam.testing.test_stream</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="sd">&quot;&quot;&quot;Provides TestStream for verifying streaming runner semantics.</span>
<span class="sd">For internal use only; no backwards-compatibility guarantees.</span>
<span class="sd">&quot;&quot;&quot;</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="kn">from</span> <span class="nn">builtins</span> <span class="k">import</span> <span class="nb">object</span>
<span class="kn">from</span> <span class="nn">functools</span> <span class="k">import</span> <span class="n">total_ordering</span>
<span class="kn">from</span> <span class="nn">future.utils</span> <span class="k">import</span> <span class="n">with_metaclass</span>
<span class="kn">from</span> <span class="nn">apache_beam</span> <span class="k">import</span> <span class="n">coders</span>
<span class="kn">from</span> <span class="nn">apache_beam</span> <span class="k">import</span> <span class="n">core</span>
<span class="kn">from</span> <span class="nn">apache_beam</span> <span class="k">import</span> <span class="n">pvalue</span>
<span class="kn">from</span> <span class="nn">apache_beam.transforms</span> <span class="k">import</span> <span class="n">PTransform</span>
<span class="kn">from</span> <span class="nn">apache_beam.transforms</span> <span class="k">import</span> <span class="n">window</span>
<span class="kn">from</span> <span class="nn">apache_beam.transforms.window</span> <span class="k">import</span> <span class="n">TimestampedValue</span>
<span class="kn">from</span> <span class="nn">apache_beam.utils</span> <span class="k">import</span> <span class="n">timestamp</span>
<span class="kn">from</span> <span class="nn">apache_beam.utils.windowed_value</span> <span class="k">import</span> <span class="n">WindowedValue</span>
<span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span>
<span class="s1">&#39;Event&#39;</span><span class="p">,</span>
<span class="s1">&#39;ElementEvent&#39;</span><span class="p">,</span>
<span class="s1">&#39;WatermarkEvent&#39;</span><span class="p">,</span>
<span class="s1">&#39;ProcessingTimeEvent&#39;</span><span class="p">,</span>
<span class="s1">&#39;TestStream&#39;</span><span class="p">,</span>
<span class="p">]</span>
<div class="viewcode-block" id="Event"><a class="viewcode-back" href="../../../apache_beam.testing.test_stream.html#apache_beam.testing.test_stream.Event">[docs]</a><span class="nd">@total_ordering</span>
<span class="k">class</span> <span class="nc">Event</span><span class="p">(</span><span class="n">with_metaclass</span><span class="p">(</span><span class="n">ABCMeta</span><span class="p">,</span> <span class="nb">object</span><span class="p">)):</span>
<span class="sd">&quot;&quot;&quot;Test stream event to be emitted during execution of a TestStream.&quot;&quot;&quot;</span>
<span class="nd">@abstractmethod</span>
<span class="k">def</span> <span class="nf">__eq__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span>
<span class="k">raise</span> <span class="ne">NotImplementedError</span>
<span class="nd">@abstractmethod</span>
<span class="k">def</span> <span class="nf">__hash__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">raise</span> <span class="ne">NotImplementedError</span>
<span class="nd">@abstractmethod</span>
<span class="k">def</span> <span class="nf">__lt__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span>
<span class="k">raise</span> <span class="ne">NotImplementedError</span></div>
<div class="viewcode-block" id="ElementEvent"><a class="viewcode-back" href="../../../apache_beam.testing.test_stream.html#apache_beam.testing.test_stream.ElementEvent">[docs]</a><span class="k">class</span> <span class="nc">ElementEvent</span><span class="p">(</span><span class="n">Event</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Element-producing test stream event.&quot;&quot;&quot;</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">timestamped_values</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">timestamped_values</span> <span class="o">=</span> <span class="n">timestamped_values</span>
<span class="k">def</span> <span class="nf">__eq__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">timestamped_values</span> <span class="o">==</span> <span class="n">other</span><span class="o">.</span><span class="n">timestamped_values</span>
<span class="k">def</span> <span class="nf">__ne__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span>
<span class="k">return</span> <span class="ow">not</span> <span class="bp">self</span> <span class="o">==</span> <span class="n">other</span>
<span class="k">def</span> <span class="nf">__hash__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="nb">hash</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">timestamped_values</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__lt__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">timestamped_values</span> <span class="o">&lt;</span> <span class="n">other</span><span class="o">.</span><span class="n">timestamped_values</span></div>
<div class="viewcode-block" id="WatermarkEvent"><a class="viewcode-back" href="../../../apache_beam.testing.test_stream.html#apache_beam.testing.test_stream.WatermarkEvent">[docs]</a><span class="k">class</span> <span class="nc">WatermarkEvent</span><span class="p">(</span><span class="n">Event</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Watermark-advancing test stream event.&quot;&quot;&quot;</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">new_watermark</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">new_watermark</span> <span class="o">=</span> <span class="n">timestamp</span><span class="o">.</span><span class="n">Timestamp</span><span class="o">.</span><span class="n">of</span><span class="p">(</span><span class="n">new_watermark</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__eq__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">new_watermark</span> <span class="o">==</span> <span class="n">other</span><span class="o">.</span><span class="n">new_watermark</span>
<span class="k">def</span> <span class="nf">__ne__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span>
<span class="k">return</span> <span class="ow">not</span> <span class="bp">self</span> <span class="o">==</span> <span class="n">other</span>
<span class="k">def</span> <span class="nf">__hash__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="nb">hash</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">new_watermark</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__lt__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">new_watermark</span> <span class="o">&lt;</span> <span class="n">other</span><span class="o">.</span><span class="n">new_watermark</span></div>
<div class="viewcode-block" id="ProcessingTimeEvent"><a class="viewcode-back" href="../../../apache_beam.testing.test_stream.html#apache_beam.testing.test_stream.ProcessingTimeEvent">[docs]</a><span class="k">class</span> <span class="nc">ProcessingTimeEvent</span><span class="p">(</span><span class="n">Event</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Processing time-advancing test stream event.&quot;&quot;&quot;</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">advance_by</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">advance_by</span> <span class="o">=</span> <span class="n">timestamp</span><span class="o">.</span><span class="n">Duration</span><span class="o">.</span><span class="n">of</span><span class="p">(</span><span class="n">advance_by</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__eq__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">advance_by</span> <span class="o">==</span> <span class="n">other</span><span class="o">.</span><span class="n">advance_by</span>
<span class="k">def</span> <span class="nf">__ne__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span>
<span class="k">return</span> <span class="ow">not</span> <span class="bp">self</span> <span class="o">==</span> <span class="n">other</span>
<span class="k">def</span> <span class="nf">__hash__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="nb">hash</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">advance_by</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__lt__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">advance_by</span> <span class="o">&lt;</span> <span class="n">other</span><span class="o">.</span><span class="n">advance_by</span></div>
<div class="viewcode-block" id="TestStream"><a class="viewcode-back" href="../../../apache_beam.testing.test_stream.html#apache_beam.testing.test_stream.TestStream">[docs]</a><span class="k">class</span> <span class="nc">TestStream</span><span class="p">(</span><span class="n">PTransform</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Test stream that generates events on an unbounded PCollection of elements.</span>
<span class="sd"> Each event emits elements, advances the watermark or advances the processing</span>
<span class="sd"> time. After all of the specified elements are emitted, ceases to produce</span>
<span class="sd"> output.</span>
<span class="sd"> &quot;&quot;&quot;</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">coder</span><span class="o">=</span><span class="n">coders</span><span class="o">.</span><span class="n">FastPrimitivesCoder</span><span class="p">):</span>
<span class="k">assert</span> <span class="n">coder</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">coder</span> <span class="o">=</span> <span class="n">coder</span>
<span class="bp">self</span><span class="o">.</span><span class="n">current_watermark</span> <span class="o">=</span> <span class="n">timestamp</span><span class="o">.</span><span class="n">MIN_TIMESTAMP</span>
<span class="bp">self</span><span class="o">.</span><span class="n">events</span> <span class="o">=</span> <span class="p">[]</span>
<div class="viewcode-block" id="TestStream.get_windowing"><a class="viewcode-back" href="../../../apache_beam.testing.test_stream.html#apache_beam.testing.test_stream.TestStream.get_windowing">[docs]</a> <span class="k">def</span> <span class="nf">get_windowing</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">unused_inputs</span><span class="p">):</span>
<span class="k">return</span> <span class="n">core</span><span class="o">.</span><span class="n">Windowing</span><span class="p">(</span><span class="n">window</span><span class="o">.</span><span class="n">GlobalWindows</span><span class="p">())</span></div>
<div class="viewcode-block" id="TestStream.expand"><a class="viewcode-back" href="../../../apache_beam.testing.test_stream.html#apache_beam.testing.test_stream.TestStream.expand">[docs]</a> <span class="k">def</span> <span class="nf">expand</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">pbegin</span><span class="p">):</span>
<span class="k">assert</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">pbegin</span><span class="p">,</span> <span class="n">pvalue</span><span class="o">.</span><span class="n">PBegin</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">pipeline</span> <span class="o">=</span> <span class="n">pbegin</span><span class="o">.</span><span class="n">pipeline</span>
<span class="k">return</span> <span class="n">pvalue</span><span class="o">.</span><span class="n">PCollection</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">pipeline</span><span class="p">)</span></div>
<span class="k">def</span> <span class="nf">_infer_output_coder</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">input_type</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">input_coder</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">coder</span>
<span class="k">def</span> <span class="nf">_add</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">event</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">event</span><span class="p">,</span> <span class="n">ElementEvent</span><span class="p">):</span>
<span class="k">for</span> <span class="n">tv</span> <span class="ow">in</span> <span class="n">event</span><span class="o">.</span><span class="n">timestamped_values</span><span class="p">:</span>
<span class="k">assert</span> <span class="n">tv</span><span class="o">.</span><span class="n">timestamp</span> <span class="o">&lt;</span> <span class="n">timestamp</span><span class="o">.</span><span class="n">MAX_TIMESTAMP</span><span class="p">,</span> <span class="p">(</span>
<span class="s1">&#39;Element timestamp must be before timestamp.MAX_TIMESTAMP.&#39;</span><span class="p">)</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">event</span><span class="p">,</span> <span class="n">WatermarkEvent</span><span class="p">):</span>
<span class="k">assert</span> <span class="n">event</span><span class="o">.</span><span class="n">new_watermark</span> <span class="o">&gt;</span> <span class="bp">self</span><span class="o">.</span><span class="n">current_watermark</span><span class="p">,</span> <span class="p">(</span>
<span class="s1">&#39;Watermark must strictly-monotonically advance.&#39;</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">current_watermark</span> <span class="o">=</span> <span class="n">event</span><span class="o">.</span><span class="n">new_watermark</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">event</span><span class="p">,</span> <span class="n">ProcessingTimeEvent</span><span class="p">):</span>
<span class="k">assert</span> <span class="n">event</span><span class="o">.</span><span class="n">advance_by</span> <span class="o">&gt;</span> <span class="mi">0</span><span class="p">,</span> <span class="p">(</span>
<span class="s1">&#39;Must advance processing time by positive amount.&#39;</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">&#39;Unknown event: </span><span class="si">%s</span><span class="s1">&#39;</span> <span class="o">%</span> <span class="n">event</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">events</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">event</span><span class="p">)</span>
<div class="viewcode-block" id="TestStream.add_elements"><a class="viewcode-back" href="../../../apache_beam.testing.test_stream.html#apache_beam.testing.test_stream.TestStream.add_elements">[docs]</a> <span class="k">def</span> <span class="nf">add_elements</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">elements</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Add elements to the TestStream.</span>
<span class="sd"> Elements added to the TestStream will be produced during pipeline execution.</span>
<span class="sd"> These elements can be TimestampedValue, WindowedValue or raw unwrapped</span>
<span class="sd"> elements that are serializable using the TestStream&#39;s specified Coder. When</span>
<span class="sd"> a TimestampedValue or a WindowedValue element is used, the timestamp of the</span>
<span class="sd"> TimestampedValue or WindowedValue will be the timestamp of the produced</span>
<span class="sd"> element; otherwise, the current watermark timestamp will be used for that</span>
<span class="sd"> element. The windows of a given WindowedValue are ignored by the</span>
<span class="sd"> TestStream.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">timestamped_values</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">for</span> <span class="n">element</span> <span class="ow">in</span> <span class="n">elements</span><span class="p">:</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">element</span><span class="p">,</span> <span class="n">TimestampedValue</span><span class="p">):</span>
<span class="n">timestamped_values</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">element</span><span class="p">)</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">element</span><span class="p">,</span> <span class="n">WindowedValue</span><span class="p">):</span>
<span class="c1"># Drop windows for elements in test stream.</span>
<span class="n">timestamped_values</span><span class="o">.</span><span class="n">append</span><span class="p">(</span>
<span class="n">TimestampedValue</span><span class="p">(</span><span class="n">element</span><span class="o">.</span><span class="n">value</span><span class="p">,</span> <span class="n">element</span><span class="o">.</span><span class="n">timestamp</span><span class="p">))</span>
<span class="k">else</span><span class="p">:</span>
<span class="c1"># Add elements with timestamp equal to current watermark.</span>
<span class="n">timestamped_values</span><span class="o">.</span><span class="n">append</span><span class="p">(</span>
<span class="n">TimestampedValue</span><span class="p">(</span><span class="n">element</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">current_watermark</span><span class="p">))</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_add</span><span class="p">(</span><span class="n">ElementEvent</span><span class="p">(</span><span class="n">timestamped_values</span><span class="p">))</span>
<span class="k">return</span> <span class="bp">self</span></div>
<div class="viewcode-block" id="TestStream.advance_watermark_to"><a class="viewcode-back" href="../../../apache_beam.testing.test_stream.html#apache_beam.testing.test_stream.TestStream.advance_watermark_to">[docs]</a> <span class="k">def</span> <span class="nf">advance_watermark_to</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">new_watermark</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Advance the watermark to a given Unix timestamp.</span>
<span class="sd"> The Unix timestamp value used must be later than the previous watermark</span>
<span class="sd"> value and should be given as an int, float or utils.timestamp.Timestamp</span>
<span class="sd"> object.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_add</span><span class="p">(</span><span class="n">WatermarkEvent</span><span class="p">(</span><span class="n">new_watermark</span><span class="p">))</span>
<span class="k">return</span> <span class="bp">self</span></div>
<div class="viewcode-block" id="TestStream.advance_watermark_to_infinity"><a class="viewcode-back" href="../../../apache_beam.testing.test_stream.html#apache_beam.testing.test_stream.TestStream.advance_watermark_to_infinity">[docs]</a> <span class="k">def</span> <span class="nf">advance_watermark_to_infinity</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Advance the watermark to the end of time.&quot;&quot;&quot;</span>
<span class="bp">self</span><span class="o">.</span><span class="n">advance_watermark_to</span><span class="p">(</span><span class="n">timestamp</span><span class="o">.</span><span class="n">MAX_TIMESTAMP</span><span class="p">)</span>
<span class="k">return</span> <span class="bp">self</span></div>
<div class="viewcode-block" id="TestStream.advance_processing_time"><a class="viewcode-back" href="../../../apache_beam.testing.test_stream.html#apache_beam.testing.test_stream.TestStream.advance_processing_time">[docs]</a> <span class="k">def</span> <span class="nf">advance_processing_time</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">advance_by</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Advance the current processing time by a given duration in seconds.</span>
<span class="sd"> The duration must be a positive second duration and should be given as an</span>
<span class="sd"> int, float or utils.timestamp.Duration object.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_add</span><span class="p">(</span><span class="n">ProcessingTimeEvent</span><span class="p">(</span><span class="n">advance_by</span><span class="p">))</span>
<span class="k">return</span> <span class="bp">self</span></div></div>
</pre></div>
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