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| <h1>Source code for apache_beam.runners.direct.bundle_factory</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">"""A factory that creates UncommittedBundles."""</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">builtins</span> <span class="k">import</span> <span class="nb">object</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.runners</span> <span class="k">import</span> <span class="n">common</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> |
| |
| |
| <div class="viewcode-block" id="BundleFactory"><a class="viewcode-back" href="../../../../apache_beam.runners.direct.bundle_factory.html#apache_beam.runners.direct.bundle_factory.BundleFactory">[docs]</a><span class="k">class</span> <span class="nc">BundleFactory</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span> |
| <span class="sd">"""For internal use only; no backwards-compatibility guarantees.</span> |
| |
| <span class="sd"> BundleFactory creates output bundles to be used by transform evaluators.</span> |
| |
| <span class="sd"> Args:</span> |
| <span class="sd"> stacked: whether or not to stack the WindowedValues within the bundle</span> |
| <span class="sd"> in case consecutive ones share the same timestamp and windows.</span> |
| <span class="sd"> DirectRunnerOptions.direct_runner_use_stacked_bundle controls this option.</span> |
| <span class="sd"> """</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">stacked</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_stacked</span> <span class="o">=</span> <span class="n">stacked</span> |
| |
| <div class="viewcode-block" id="BundleFactory.create_bundle"><a class="viewcode-back" href="../../../../apache_beam.runners.direct.bundle_factory.html#apache_beam.runners.direct.bundle_factory.BundleFactory.create_bundle">[docs]</a> <span class="k">def</span> <span class="nf">create_bundle</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">output_pcollection</span><span class="p">):</span> |
| <span class="k">return</span> <span class="n">_Bundle</span><span class="p">(</span><span class="n">output_pcollection</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_stacked</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="BundleFactory.create_empty_committed_bundle"><a class="viewcode-back" href="../../../../apache_beam.runners.direct.bundle_factory.html#apache_beam.runners.direct.bundle_factory.BundleFactory.create_empty_committed_bundle">[docs]</a> <span class="k">def</span> <span class="nf">create_empty_committed_bundle</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">output_pcollection</span><span class="p">):</span> |
| <span class="n">bundle</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">create_bundle</span><span class="p">(</span><span class="n">output_pcollection</span><span class="p">)</span> |
| <span class="n">bundle</span><span class="o">.</span><span class="n">commit</span><span class="p">(</span><span class="kc">None</span><span class="p">)</span> |
| <span class="k">return</span> <span class="n">bundle</span></div></div> |
| |
| |
| <span class="c1"># a bundle represents a unit of work that will be processed by a transform.</span> |
| <span class="k">class</span> <span class="nc">_Bundle</span><span class="p">(</span><span class="n">common</span><span class="o">.</span><span class="n">Receiver</span><span class="p">):</span> |
| <span class="sd">"""Part of a PCollection with output elements.</span> |
| |
| <span class="sd"> Part of a PCollection. Elements are output to a bundle, which will cause them</span> |
| <span class="sd"> to be executed by PTransform that consume the PCollection this bundle is a</span> |
| <span class="sd"> part of at a later point. It starts as an uncommitted bundle and can have</span> |
| <span class="sd"> elements added to it. It needs to be committed to make it immutable before</span> |
| <span class="sd"> passing it to a downstream ptransform.</span> |
| |
| <span class="sd"> The stored elements are WindowedValues, which contains timestamp and windows</span> |
| <span class="sd"> information.</span> |
| |
| <span class="sd"> Bundle internally optimizes storage by stacking elements with the same</span> |
| <span class="sd"> timestamp and windows into StackedWindowedValues, and then returns an iterable</span> |
| <span class="sd"> to restore WindowedValues upon get_elements() call.</span> |
| |
| <span class="sd"> When this optimization is not desired, it can be avoided by an option when</span> |
| <span class="sd"> creating bundles, like:::</span> |
| |
| <span class="sd"> b = Bundle(stacked=False)</span> |
| <span class="sd"> """</span> |
| |
| <span class="k">class</span> <span class="nc">_StackedWindowedValues</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span> |
| <span class="sd">"""A stack of WindowedValues with the same timestamp and windows.</span> |
| |
| <span class="sd"> It must be initialized from a single WindowedValue.</span> |
| |
| <span class="sd"> Example:::</span> |
| |
| <span class="sd"> s = StackedWindowedValues(windowed_value)</span> |
| <span class="sd"> if (another_windowed_value.timestamp == s.timestamp and</span> |
| <span class="sd"> another_windowed_value.windows == s.windows):</span> |
| <span class="sd"> s.add_value(another_windowed_value.value)</span> |
| <span class="sd"> windowed_values = [wv for wv in s.windowed_values()]</span> |
| <span class="sd"> # now windowed_values equals to [windowed_value, another_windowed_value]</span> |
| <span class="sd"> """</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">initial_windowed_value</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_initial_windowed_value</span> <span class="o">=</span> <span class="n">initial_windowed_value</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_appended_values</span> <span class="o">=</span> <span class="p">[]</span> |
| |
| <span class="nd">@property</span> |
| <span class="k">def</span> <span class="nf">timestamp</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_initial_windowed_value</span><span class="o">.</span><span class="n">timestamp</span> |
| |
| <span class="nd">@property</span> |
| <span class="k">def</span> <span class="nf">windows</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_initial_windowed_value</span><span class="o">.</span><span class="n">windows</span> |
| |
| <span class="k">def</span> <span class="nf">add_value</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_appended_values</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">value</span><span class="p">)</span> |
| |
| <span class="k">def</span> <span class="nf">windowed_values</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="c1"># yield first windowed_value as is, then iterate through</span> |
| <span class="c1"># _appended_values to yield WindowedValue on the fly.</span> |
| <span class="k">yield</span> <span class="bp">self</span><span class="o">.</span><span class="n">_initial_windowed_value</span> |
| <span class="k">for</span> <span class="n">v</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_appended_values</span><span class="p">:</span> |
| <span class="k">yield</span> <span class="n">WindowedValue</span><span class="p">(</span><span class="n">v</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_initial_windowed_value</span><span class="o">.</span><span class="n">timestamp</span><span class="p">,</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_initial_windowed_value</span><span class="o">.</span><span class="n">windows</span><span class="p">)</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">pcollection</span><span class="p">,</span> <span class="n">stacked</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span> |
| <span class="k">assert</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">pcollection</span><span class="p">,</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="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">_pcollection</span> <span class="o">=</span> <span class="n">pcollection</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_elements</span> <span class="o">=</span> <span class="p">[]</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_stacked</span> <span class="o">=</span> <span class="n">stacked</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_committed</span> <span class="o">=</span> <span class="kc">False</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_tag</span> <span class="o">=</span> <span class="kc">None</span> <span class="c1"># optional tag information for this bundle</span> |
| |
| <span class="k">def</span> <span class="nf">get_elements_iterable</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">make_copy</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span> |
| <span class="sd">"""Returns iterable elements.</span> |
| |
| <span class="sd"> Args:</span> |
| <span class="sd"> make_copy: whether to force returning copy or yielded iterable.</span> |
| |
| <span class="sd"> Returns:</span> |
| <span class="sd"> unstacked elements,</span> |
| <span class="sd"> in the form of iterable if committed and make_copy is not True,</span> |
| <span class="sd"> or as a list of copied WindowedValues.</span> |
| <span class="sd"> """</span> |
| <span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_stacked</span><span class="p">:</span> |
| <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_committed</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">make_copy</span><span class="p">:</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_elements</span> |
| <span class="k">return</span> <span class="nb">list</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_elements</span><span class="p">)</span> |
| |
| <span class="k">def</span> <span class="nf">iterable_stacked_or_elements</span><span class="p">(</span><span class="n">elements</span><span class="p">):</span> |
| <span class="k">for</span> <span class="n">e</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">e</span><span class="p">,</span> <span class="n">_Bundle</span><span class="o">.</span><span class="n">_StackedWindowedValues</span><span class="p">):</span> |
| <span class="k">for</span> <span class="n">w</span> <span class="ow">in</span> <span class="n">e</span><span class="o">.</span><span class="n">windowed_values</span><span class="p">():</span> |
| <span class="k">yield</span> <span class="n">w</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="k">yield</span> <span class="n">e</span> |
| |
| <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_committed</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">make_copy</span><span class="p">:</span> |
| <span class="k">return</span> <span class="n">iterable_stacked_or_elements</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_elements</span><span class="p">)</span> |
| <span class="c1"># returns a copy.</span> |
| <span class="k">return</span> <span class="p">[</span><span class="n">e</span> <span class="k">for</span> <span class="n">e</span> <span class="ow">in</span> <span class="n">iterable_stacked_or_elements</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_elements</span><span class="p">)]</span> |
| |
| <span class="k">def</span> <span class="nf">has_elements</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="k">return</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_elements</span><span class="p">)</span> <span class="o">></span> <span class="mi">0</span> |
| |
| <span class="nd">@property</span> |
| <span class="k">def</span> <span class="nf">tag</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_tag</span> |
| |
| <span class="nd">@tag</span><span class="o">.</span><span class="n">setter</span> |
| <span class="k">def</span> <span class="nf">tag</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</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">_tag</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_tag</span> <span class="o">=</span> <span class="n">value</span> |
| |
| <span class="nd">@property</span> |
| <span class="k">def</span> <span class="nf">pcollection</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> |
| <span class="sd">"""PCollection that the elements of this UncommittedBundle belong to."""</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_pcollection</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">element</span><span class="p">):</span> |
| <span class="sd">"""Outputs an element to this bundle.</span> |
| |
| <span class="sd"> Args:</span> |
| <span class="sd"> element: WindowedValue</span> |
| <span class="sd"> """</span> |
| <span class="k">assert</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_committed</span> |
| <span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_stacked</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_elements</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">return</span> |
| <span class="k">if</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_elements</span> <span class="ow">and</span> |
| <span class="p">(</span><span class="nb">isinstance</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_elements</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">],</span> <span class="p">(</span><span class="n">WindowedValue</span><span class="p">,</span> |
| <span class="n">_Bundle</span><span class="o">.</span><span class="n">_StackedWindowedValues</span><span class="p">)))</span> <span class="ow">and</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_elements</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">timestamp</span> <span class="o">==</span> <span class="n">element</span><span class="o">.</span><span class="n">timestamp</span> <span class="ow">and</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_elements</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">windows</span> <span class="o">==</span> <span class="n">element</span><span class="o">.</span><span class="n">windows</span><span class="p">):</span> |
| <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_elements</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">],</span> <span class="n">WindowedValue</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_elements</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> <span class="o">=</span> <span class="n">_Bundle</span><span class="o">.</span><span class="n">_StackedWindowedValues</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_elements</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">])</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_elements</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">add_value</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="k">else</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_elements</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">def</span> <span class="nf">output</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="bp">self</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">element</span><span class="p">)</span> |
| |
| <span class="k">def</span> <span class="nf">receive</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="bp">self</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">element</span><span class="p">)</span> |
| |
| <span class="k">def</span> <span class="nf">commit</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">synchronized_processing_time</span><span class="p">):</span> |
| <span class="sd">"""Commits this bundle.</span> |
| |
| <span class="sd"> Uncommitted bundle will become committed (immutable) after this call.</span> |
| |
| <span class="sd"> Args:</span> |
| <span class="sd"> synchronized_processing_time: the synchronized processing time at which</span> |
| <span class="sd"> this bundle was committed</span> |
| <span class="sd"> """</span> |
| <span class="k">assert</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_committed</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_committed</span> <span class="o">=</span> <span class="kc">True</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_elements</span> <span class="o">=</span> <span class="nb">tuple</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_elements</span><span class="p">)</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_synchronized_processing_time</span> <span class="o">=</span> <span class="n">synchronized_processing_time</span> |
| </pre></div> |
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