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| <div class="section" id="module-apache_beam.utils.urns"> |
| <span id="apache-beam-utils-urns-module"></span><h1>apache_beam.utils.urns module<a class="headerlink" href="#module-apache_beam.utils.urns" title="Permalink to this headline">¶</a></h1> |
| <p>For internal use only; no backwards-compatibility guarantees.</p> |
| <dl class="class"> |
| <dt id="apache_beam.utils.urns.RunnerApiFn"> |
| <em class="property">class </em><code class="descclassname">apache_beam.utils.urns.</code><code class="descname">RunnerApiFn</code><a class="reference internal" href="_modules/apache_beam/utils/urns.html#RunnerApiFn"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.utils.urns.RunnerApiFn" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Bases: <a class="reference external" href="https://docs.python.org/3/library/functions.html#object" title="(in Python v3.8)"><code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></a></p> |
| <p>Abstract base class that provides urn registration utilities.</p> |
| <p>A class that inherits from this class will get a registration-based |
| from_runner_api and to_runner_api method that convert to and from |
| beam_runner_api_pb2.FunctionSpec.</p> |
| <p>Additionally, register_pickle_urn can be called from the body of a class |
| to register serialization via pickling.</p> |
| <dl class="method"> |
| <dt id="apache_beam.utils.urns.RunnerApiFn.to_runner_api_parameter"> |
| <code class="descname">to_runner_api_parameter</code><span class="sig-paren">(</span><em>unused_context</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/utils/urns.html#RunnerApiFn.to_runner_api_parameter"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.utils.urns.RunnerApiFn.to_runner_api_parameter" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Returns the urn and payload for this Fn.</p> |
| <p>The returned urn(s) should be registered with <cite>register_urn</cite>.</p> |
| </dd></dl> |
| |
| <dl class="classmethod"> |
| <dt id="apache_beam.utils.urns.RunnerApiFn.register_urn"> |
| <em class="property">classmethod </em><code class="descname">register_urn</code><span class="sig-paren">(</span><em>urn</em>, <em>parameter_type</em>, <em>fn=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/utils/urns.html#RunnerApiFn.register_urn"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.utils.urns.RunnerApiFn.register_urn" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Registers a urn with a constructor.</p> |
| <p>For example, if ‘beam:fn:foo’ had parameter type FooPayload, one could |
| write <cite>RunnerApiFn.register_urn(‘bean:fn:foo’, FooPayload, foo_from_proto)</cite> |
| where foo_from_proto took as arguments a FooPayload and a PipelineContext. |
| This function can also be used as a decorator rather than passing the |
| callable in as the final parameter.</p> |
| <p>A corresponding to_runner_api_parameter method would be expected that |
| returns the tuple (‘beam:fn:foo’, FooPayload)</p> |
| </dd></dl> |
| |
| <dl class="classmethod"> |
| <dt id="apache_beam.utils.urns.RunnerApiFn.register_pickle_urn"> |
| <em class="property">classmethod </em><code class="descname">register_pickle_urn</code><span class="sig-paren">(</span><em>pickle_urn</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/utils/urns.html#RunnerApiFn.register_pickle_urn"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.utils.urns.RunnerApiFn.register_pickle_urn" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Registers and implements the given urn via pickling.</p> |
| </dd></dl> |
| |
| <dl class="method"> |
| <dt id="apache_beam.utils.urns.RunnerApiFn.to_runner_api"> |
| <code class="descname">to_runner_api</code><span class="sig-paren">(</span><em>context</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/utils/urns.html#RunnerApiFn.to_runner_api"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.utils.urns.RunnerApiFn.to_runner_api" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Returns an FunctionSpec encoding this Fn.</p> |
| <p>Prefer overriding self.to_runner_api_parameter.</p> |
| </dd></dl> |
| |
| <dl class="classmethod"> |
| <dt id="apache_beam.utils.urns.RunnerApiFn.from_runner_api"> |
| <em class="property">classmethod </em><code class="descname">from_runner_api</code><span class="sig-paren">(</span><em>fn_proto</em>, <em>context</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/utils/urns.html#RunnerApiFn.from_runner_api"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.utils.urns.RunnerApiFn.from_runner_api" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Converts from an FunctionSpec to a Fn object.</p> |
| <p>Prefer registering a urn with its parameter type and constructor.</p> |
| </dd></dl> |
| |
| </dd></dl> |
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