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<h1>Source code for apache_beam.runners.pipeline_context</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;Utility class for serializing pipelines via the runner API.</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">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">coders</span>
<span class="kn">from</span> <span class="nn">apache_beam</span> <span class="k">import</span> <span class="n">pipeline</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.portability.api</span> <span class="k">import</span> <span class="n">beam_fn_api_pb2</span>
<span class="kn">from</span> <span class="nn">apache_beam.portability.api</span> <span class="k">import</span> <span class="n">beam_runner_api_pb2</span>
<span class="kn">from</span> <span class="nn">apache_beam.transforms</span> <span class="k">import</span> <span class="n">core</span>
<div class="viewcode-block" id="Environment"><a class="viewcode-back" href="../../../apache_beam.runners.pipeline_context.html#apache_beam.runners.pipeline_context.Environment">[docs]</a><span class="k">class</span> <span class="nc">Environment</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;A wrapper around the environment proto.</span>
<span class="sd"> Provides consistency with how the other componentes are accessed.</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">proto</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_proto</span> <span class="o">=</span> <span class="n">proto</span>
<div class="viewcode-block" id="Environment.to_runner_api"><a class="viewcode-back" href="../../../apache_beam.runners.pipeline_context.html#apache_beam.runners.pipeline_context.Environment.to_runner_api">[docs]</a> <span class="k">def</span> <span class="nf">to_runner_api</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">context</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_proto</span></div>
<div class="viewcode-block" id="Environment.from_runner_api"><a class="viewcode-back" href="../../../apache_beam.runners.pipeline_context.html#apache_beam.runners.pipeline_context.Environment.from_runner_api">[docs]</a> <span class="nd">@staticmethod</span>
<span class="k">def</span> <span class="nf">from_runner_api</span><span class="p">(</span><span class="n">proto</span><span class="p">,</span> <span class="n">context</span><span class="p">):</span>
<span class="k">return</span> <span class="n">Environment</span><span class="p">(</span><span class="n">proto</span><span class="p">)</span></div></div>
<span class="k">class</span> <span class="nc">_PipelineContextMap</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;This is a bi-directional map between objects and ids.</span>
<span class="sd"> Under the hood it encodes and decodes these objects into runner API</span>
<span class="sd"> representations.</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">context</span><span class="p">,</span> <span class="n">obj_type</span><span class="p">,</span> <span class="n">proto_map</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_pipeline_context</span> <span class="o">=</span> <span class="n">context</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_obj_type</span> <span class="o">=</span> <span class="n">obj_type</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_obj_to_id</span> <span class="o">=</span> <span class="p">{}</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_id_to_obj</span> <span class="o">=</span> <span class="p">{}</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_id_to_proto</span> <span class="o">=</span> <span class="nb">dict</span><span class="p">(</span><span class="n">proto_map</span><span class="p">)</span> <span class="k">if</span> <span class="n">proto_map</span> <span class="k">else</span> <span class="p">{}</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_counter</span> <span class="o">=</span> <span class="mi">0</span>
<span class="k">def</span> <span class="nf">_unique_ref</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">obj</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_counter</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="k">return</span> <span class="s2">&quot;ref_</span><span class="si">%s</span><span class="s2">_</span><span class="si">%s</span><span class="s2">_</span><span class="si">%s</span><span class="s2">&quot;</span> <span class="o">%</span> <span class="p">(</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_obj_type</span><span class="o">.</span><span class="vm">__name__</span><span class="p">,</span> <span class="n">label</span> <span class="ow">or</span> <span class="nb">type</span><span class="p">(</span><span class="n">obj</span><span class="p">)</span><span class="o">.</span><span class="vm">__name__</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_counter</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">populate_map</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">proto_map</span><span class="p">):</span>
<span class="k">for</span> <span class="nb">id</span><span class="p">,</span> <span class="n">proto</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_id_to_proto</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
<span class="n">proto_map</span><span class="p">[</span><span class="nb">id</span><span class="p">]</span><span class="o">.</span><span class="n">CopyFrom</span><span class="p">(</span><span class="n">proto</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">get_id</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">obj</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="k">if</span> <span class="n">obj</span> <span class="ow">not</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_obj_to_id</span><span class="p">:</span>
<span class="nb">id</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_unique_ref</span><span class="p">(</span><span class="n">obj</span><span class="p">,</span> <span class="n">label</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_id_to_obj</span><span class="p">[</span><span class="nb">id</span><span class="p">]</span> <span class="o">=</span> <span class="n">obj</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_obj_to_id</span><span class="p">[</span><span class="n">obj</span><span class="p">]</span> <span class="o">=</span> <span class="nb">id</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_id_to_proto</span><span class="p">[</span><span class="nb">id</span><span class="p">]</span> <span class="o">=</span> <span class="n">obj</span><span class="o">.</span><span class="n">to_runner_api</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_pipeline_context</span><span class="p">)</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_obj_to_id</span><span class="p">[</span><span class="n">obj</span><span class="p">]</span>
<span class="k">def</span> <span class="nf">get_proto</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">obj</span><span class="p">,</span> <span class="n">label</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">_id_to_proto</span><span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">get_id</span><span class="p">(</span><span class="n">obj</span><span class="p">,</span> <span class="n">label</span><span class="p">)]</span>
<span class="k">def</span> <span class="nf">get_by_id</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="nb">id</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">id</span> <span class="ow">not</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_id_to_obj</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_id_to_obj</span><span class="p">[</span><span class="nb">id</span><span class="p">]</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_obj_type</span><span class="o">.</span><span class="n">from_runner_api</span><span class="p">(</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_id_to_proto</span><span class="p">[</span><span class="nb">id</span><span class="p">],</span> <span class="bp">self</span><span class="o">.</span><span class="n">_pipeline_context</span><span class="p">)</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_id_to_obj</span><span class="p">[</span><span class="nb">id</span><span class="p">]</span>
<span class="k">def</span> <span class="nf">__getitem__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="nb">id</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_by_id</span><span class="p">(</span><span class="nb">id</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__contains__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="nb">id</span><span class="p">):</span>
<span class="k">return</span> <span class="nb">id</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_id_to_proto</span>
<div class="viewcode-block" id="PipelineContext"><a class="viewcode-back" href="../../../apache_beam.runners.pipeline_context.html#apache_beam.runners.pipeline_context.PipelineContext">[docs]</a><span class="k">class</span> <span class="nc">PipelineContext</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;For internal use only; no backwards-compatibility guarantees.</span>
<span class="sd"> Used for accessing and constructing the referenced objects of a Pipeline.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">_COMPONENT_TYPES</span> <span class="o">=</span> <span class="p">{</span>
<span class="s1">&#39;transforms&#39;</span><span class="p">:</span> <span class="n">pipeline</span><span class="o">.</span><span class="n">AppliedPTransform</span><span class="p">,</span>
<span class="s1">&#39;pcollections&#39;</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="s1">&#39;coders&#39;</span><span class="p">:</span> <span class="n">coders</span><span class="o">.</span><span class="n">Coder</span><span class="p">,</span>
<span class="s1">&#39;windowing_strategies&#39;</span><span class="p">:</span> <span class="n">core</span><span class="o">.</span><span class="n">Windowing</span><span class="p">,</span>
<span class="s1">&#39;environments&#39;</span><span class="p">:</span> <span class="n">Environment</span><span class="p">,</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">proto</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">default_environment</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">proto</span><span class="p">,</span> <span class="n">beam_fn_api_pb2</span><span class="o">.</span><span class="n">ProcessBundleDescriptor</span><span class="p">):</span>
<span class="n">proto</span> <span class="o">=</span> <span class="n">beam_runner_api_pb2</span><span class="o">.</span><span class="n">Components</span><span class="p">(</span>
<span class="n">coders</span><span class="o">=</span><span class="nb">dict</span><span class="p">(</span><span class="n">proto</span><span class="o">.</span><span class="n">coders</span><span class="o">.</span><span class="n">items</span><span class="p">()),</span>
<span class="n">windowing_strategies</span><span class="o">=</span><span class="nb">dict</span><span class="p">(</span><span class="n">proto</span><span class="o">.</span><span class="n">windowing_strategies</span><span class="o">.</span><span class="n">items</span><span class="p">()),</span>
<span class="n">environments</span><span class="o">=</span><span class="nb">dict</span><span class="p">(</span><span class="n">proto</span><span class="o">.</span><span class="n">environments</span><span class="o">.</span><span class="n">items</span><span class="p">()))</span>
<span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="bp">cls</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_COMPONENT_TYPES</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
<span class="nb">setattr</span><span class="p">(</span>
<span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">_PipelineContextMap</span><span class="p">(</span>
<span class="bp">self</span><span class="p">,</span> <span class="bp">cls</span><span class="p">,</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">proto</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="kc">None</span><span class="p">)))</span>
<span class="k">if</span> <span class="n">default_environment</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_default_environment_id</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">environments</span><span class="o">.</span><span class="n">get_id</span><span class="p">(</span>
<span class="n">Environment</span><span class="p">(</span><span class="n">default_environment</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">_default_environment_id</span> <span class="o">=</span> <span class="kc">None</span>
<div class="viewcode-block" id="PipelineContext.from_runner_api"><a class="viewcode-back" href="../../../apache_beam.runners.pipeline_context.html#apache_beam.runners.pipeline_context.PipelineContext.from_runner_api">[docs]</a> <span class="nd">@staticmethod</span>
<span class="k">def</span> <span class="nf">from_runner_api</span><span class="p">(</span><span class="n">proto</span><span class="p">):</span>
<span class="k">return</span> <span class="n">PipelineContext</span><span class="p">(</span><span class="n">proto</span><span class="p">)</span></div>
<div class="viewcode-block" id="PipelineContext.to_runner_api"><a class="viewcode-back" href="../../../apache_beam.runners.pipeline_context.html#apache_beam.runners.pipeline_context.PipelineContext.to_runner_api">[docs]</a> <span class="k">def</span> <span class="nf">to_runner_api</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">context_proto</span> <span class="o">=</span> <span class="n">beam_runner_api_pb2</span><span class="o">.</span><span class="n">Components</span><span class="p">()</span>
<span class="k">for</span> <span class="n">name</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_COMPONENT_TYPES</span><span class="p">:</span>
<span class="nb">getattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">)</span><span class="o">.</span><span class="n">populate_map</span><span class="p">(</span><span class="nb">getattr</span><span class="p">(</span><span class="n">context_proto</span><span class="p">,</span> <span class="n">name</span><span class="p">))</span>
<span class="k">return</span> <span class="n">context_proto</span></div>
<div class="viewcode-block" id="PipelineContext.default_environment_id"><a class="viewcode-back" href="../../../apache_beam.runners.pipeline_context.html#apache_beam.runners.pipeline_context.PipelineContext.default_environment_id">[docs]</a> <span class="k">def</span> <span class="nf">default_environment_id</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">_default_environment_id</span></div></div>
</pre></div>
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