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   <div class="section" id="module-apache_beam.transforms.external">
 <span id="apache-beam-transforms-external-module"></span><h1>apache_beam.transforms.external module<a class="headerlink" href="#module-apache_beam.transforms.external" title="Permalink to this headline">¶</a></h1>
 <p>Defines Transform whose expansion is implemented elsewhere.</p>
 <p>No backward compatibility guarantees. Everything in this module is experimental.</p>
 <dl class="function">
 <dt id="apache_beam.transforms.external.iter_urns">
 <code class="descclassname">apache_beam.transforms.external.</code><code class="descname">iter_urns</code><span class="sig-paren">(</span><em>coder</em>, <em>context=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/external.html#iter_urns"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.external.iter_urns" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>

 <dl class="class">
 <dt id="apache_beam.transforms.external.PayloadBuilder">
 <em class="property">class </em><code class="descclassname">apache_beam.transforms.external.</code><code class="descname">PayloadBuilder</code><a class="reference internal" href="_modules/apache_beam/transforms/external.html#PayloadBuilder"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.external.PayloadBuilder" title="Permalink to this definition">¶</a></dt>
 <dd><p>Bases: <a class="reference external" href="https://docs.python.org/2/library/functions.html#object" title="(in Python v2.7)"><code class="xref py py-class docutils literal"><span class="pre">object</span></code></a></p>
 <p>Abstract base class for building payloads to pass to ExternalTransform.</p>
 <dl class="method">
 <dt id="apache_beam.transforms.external.PayloadBuilder.build">
 <code class="descname">build</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/external.html#PayloadBuilder.build"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.external.PayloadBuilder.build" title="Permalink to this definition">¶</a></dt>
 <dd><table class="docutils field-list" frame="void" rules="none">
 <col class="field-name" />
 <col class="field-body" />
 <tbody valign="top">
 <tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">ExternalConfigurationPayload</td>
 </tr>
 </tbody>
 </table>
 </dd></dl>

 <dl class="method">
 <dt id="apache_beam.transforms.external.PayloadBuilder.payload">
 <code class="descname">payload</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/external.html#PayloadBuilder.payload"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.external.PayloadBuilder.payload" title="Permalink to this definition">¶</a></dt>
 <dd><p>The serialized ExternalConfigurationPayload</p>
 <table class="docutils field-list" frame="void" rules="none">
 <col class="field-name" />
 <col class="field-body" />
 <tbody valign="top">
 <tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">bytes</td>
 </tr>
 </tbody>
 </table>
 </dd></dl>

 </dd></dl>

 <dl class="class">
 <dt id="apache_beam.transforms.external.SchemaBasedPayloadBuilder">
 <em class="property">class </em><code class="descclassname">apache_beam.transforms.external.</code><code class="descname">SchemaBasedPayloadBuilder</code><span class="sig-paren">(</span><em>values</em>, <em>schema</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/external.html#SchemaBasedPayloadBuilder"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.external.SchemaBasedPayloadBuilder" title="Permalink to this definition">¶</a></dt>
 <dd><p>Bases: <a class="reference internal" href="#apache_beam.transforms.external.PayloadBuilder" title="apache_beam.transforms.external.PayloadBuilder"><code class="xref py py-class docutils literal"><span class="pre">apache_beam.transforms.external.PayloadBuilder</span></code></a></p>
 <p>Base class for building payloads based on a schema that provides
 type information for each configuration value to encode.</p>
 <p>Note that if the schema defines a type as Optional, the corresponding value
 will be omitted from the encoded payload, and thus the native transform
 will determine the default.</p>
 <table class="docutils field-list" frame="void" rules="none">
 <col class="field-name" />
 <col class="field-body" />
 <tbody valign="top">
 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
 <li><strong>values</strong> – mapping of config names to values</li>
 <li><strong>schema</strong> – mapping of config names to types</li>
 </ul>
 </td>
 </tr>
 </tbody>
 </table>
 <dl class="method">
 <dt id="apache_beam.transforms.external.SchemaBasedPayloadBuilder.build">
 <code class="descname">build</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/external.html#SchemaBasedPayloadBuilder.build"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.external.SchemaBasedPayloadBuilder.build" title="Permalink to this definition">¶</a></dt>
 <dd><table class="docutils field-list" frame="void" rules="none">
 <col class="field-name" />
 <col class="field-body" />
 <tbody valign="top">
 <tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">ExternalConfigurationPayload</td>
 </tr>
 </tbody>
 </table>
 </dd></dl>

 </dd></dl>

 <dl class="class">
 <dt id="apache_beam.transforms.external.ImplicitSchemaPayloadBuilder">
 <em class="property">class </em><code class="descclassname">apache_beam.transforms.external.</code><code class="descname">ImplicitSchemaPayloadBuilder</code><span class="sig-paren">(</span><em>values</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/external.html#ImplicitSchemaPayloadBuilder"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.external.ImplicitSchemaPayloadBuilder" title="Permalink to this definition">¶</a></dt>
 <dd><p>Bases: <a class="reference internal" href="#apache_beam.transforms.external.SchemaBasedPayloadBuilder" title="apache_beam.transforms.external.SchemaBasedPayloadBuilder"><code class="xref py py-class docutils literal"><span class="pre">apache_beam.transforms.external.SchemaBasedPayloadBuilder</span></code></a></p>
 <p>Build a payload that generates a schema from the provided values.</p>
 </dd></dl>

 <dl class="class">
 <dt id="apache_beam.transforms.external.NamedTupleBasedPayloadBuilder">
 <em class="property">class </em><code class="descclassname">apache_beam.transforms.external.</code><code class="descname">NamedTupleBasedPayloadBuilder</code><span class="sig-paren">(</span><em>tuple_instance</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/external.html#NamedTupleBasedPayloadBuilder"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.external.NamedTupleBasedPayloadBuilder" title="Permalink to this definition">¶</a></dt>
 <dd><p>Bases: <a class="reference internal" href="#apache_beam.transforms.external.SchemaBasedPayloadBuilder" title="apache_beam.transforms.external.SchemaBasedPayloadBuilder"><code class="xref py py-class docutils literal"><span class="pre">apache_beam.transforms.external.SchemaBasedPayloadBuilder</span></code></a></p>
 <p>Build a payload based on a NamedTuple schema.</p>
 <table class="docutils field-list" frame="void" rules="none">
 <col class="field-name" />
 <col class="field-body" />
 <tbody valign="top">
 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>tuple_instance</strong> – an instance of a typing.NamedTuple</td>
 </tr>
 </tbody>
 </table>
 </dd></dl>

 <dl class="class">
 <dt id="apache_beam.transforms.external.AnnotationBasedPayloadBuilder">
 <em class="property">class </em><code class="descclassname">apache_beam.transforms.external.</code><code class="descname">AnnotationBasedPayloadBuilder</code><span class="sig-paren">(</span><em>transform</em>, <em>**values</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/external.html#AnnotationBasedPayloadBuilder"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.external.AnnotationBasedPayloadBuilder" title="Permalink to this definition">¶</a></dt>
 <dd><p>Bases: <a class="reference internal" href="#apache_beam.transforms.external.SchemaBasedPayloadBuilder" title="apache_beam.transforms.external.SchemaBasedPayloadBuilder"><code class="xref py py-class docutils literal"><span class="pre">apache_beam.transforms.external.SchemaBasedPayloadBuilder</span></code></a></p>
 <p>Build a payload based on an external transform’s type annotations.</p>
 <p>Supported in python 3 only.</p>
 <table class="docutils field-list" frame="void" rules="none">
 <col class="field-name" />
 <col class="field-body" />
 <tbody valign="top">
 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
 <li><strong>transform</strong> – a PTransform instance or class. type annotations will
 be gathered from its __init__ method</li>
 <li><strong>values</strong> – values to encode</li>
 </ul>
 </td>
 </tr>
 </tbody>
 </table>
 </dd></dl>

 <dl class="class">
 <dt id="apache_beam.transforms.external.DataclassBasedPayloadBuilder">
 <em class="property">class </em><code class="descclassname">apache_beam.transforms.external.</code><code class="descname">DataclassBasedPayloadBuilder</code><span class="sig-paren">(</span><em>transform</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/external.html#DataclassBasedPayloadBuilder"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.external.DataclassBasedPayloadBuilder" title="Permalink to this definition">¶</a></dt>
 <dd><p>Bases: <a class="reference internal" href="#apache_beam.transforms.external.SchemaBasedPayloadBuilder" title="apache_beam.transforms.external.SchemaBasedPayloadBuilder"><code class="xref py py-class docutils literal"><span class="pre">apache_beam.transforms.external.SchemaBasedPayloadBuilder</span></code></a></p>
 <p>Build a payload based on an external transform that uses dataclasses.</p>
 <p>Supported in python 3 only.</p>
 <table class="docutils field-list" frame="void" rules="none">
 <col class="field-name" />
 <col class="field-body" />
 <tbody valign="top">
 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>transform</strong> – a dataclass-decorated PTransform instance from which to
 gather type annotations and values</td>
 </tr>
 </tbody>
 </table>
 </dd></dl>

 <dl class="class">
 <dt id="apache_beam.transforms.external.ExternalTransform">
 <em class="property">class </em><code class="descclassname">apache_beam.transforms.external.</code><code class="descname">ExternalTransform</code><span class="sig-paren">(</span><em>urn</em>, <em>payload</em>, <em>expansion_service=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/external.html#ExternalTransform"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.external.ExternalTransform" title="Permalink to this definition">¶</a></dt>
 <dd><p>Bases: <a class="reference internal" href="apache_beam.transforms.ptransform.html#apache_beam.transforms.ptransform.PTransform" title="apache_beam.transforms.ptransform.PTransform"><code class="xref py py-class docutils literal"><span class="pre">apache_beam.transforms.ptransform.PTransform</span></code></a></p>
 <p>External provides a cross-language transform via expansion services in
 foreign SDKs.</p>
 <p>Experimental; no backwards compatibility guarantees.</p>
 <p>Wrapper for an external transform with the given urn and payload.</p>
 <table class="docutils field-list" frame="void" rules="none">
 <col class="field-name" />
 <col class="field-body" />
 <tbody valign="top">
 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
 <li><strong>urn</strong> – the unique beam identifier for this transform</li>
 <li><strong>payload</strong> – the payload, either as a byte string or a PayloadBuilder</li>
 <li><strong>expansion_service</strong> – an expansion service implementing the beam
 ExpansionService protocol, either as an object with an Expand method
 or an address (as a str) to a grpc server that provides this method.</li>
 </ul>
 </td>
 </tr>
 </tbody>
 </table>
 <dl class="method">
 <dt id="apache_beam.transforms.external.ExternalTransform.default_label">
 <code class="descname">default_label</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/external.html#ExternalTransform.default_label"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.external.ExternalTransform.default_label" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>

 <dl class="classmethod">
 <dt id="apache_beam.transforms.external.ExternalTransform.get_local_namespace">
 <em class="property">classmethod </em><code class="descname">get_local_namespace</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/external.html#ExternalTransform.get_local_namespace"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.external.ExternalTransform.get_local_namespace" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>

 <dl class="classmethod">
 <dt id="apache_beam.transforms.external.ExternalTransform.outer_namespace">
 <em class="property">classmethod </em><code class="descname">outer_namespace</code><span class="sig-paren">(</span><em>*args</em>, <em>**kwds</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/external.html#ExternalTransform.outer_namespace"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.external.ExternalTransform.outer_namespace" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>

 <dl class="method">
 <dt id="apache_beam.transforms.external.ExternalTransform.expand">
 <code class="descname">expand</code><span class="sig-paren">(</span><em>pvalueish</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/external.html#ExternalTransform.expand"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.external.ExternalTransform.expand" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>

 <dl class="method">
 <dt id="apache_beam.transforms.external.ExternalTransform.to_runner_api_transform">
 <code class="descname">to_runner_api_transform</code><span class="sig-paren">(</span><em>context</em>, <em>full_label</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/external.html#ExternalTransform.to_runner_api_transform"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.external.ExternalTransform.to_runner_api_transform" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>

 </dd></dl>

 <dl class="class">
 <dt id="apache_beam.transforms.external.JavaJarExpansionService">
 <em class="property">class </em><code class="descclassname">apache_beam.transforms.external.</code><code class="descname">JavaJarExpansionService</code><span class="sig-paren">(</span><em>path_to_jar</em>, <em>extra_args=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/external.html#JavaJarExpansionService"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.external.JavaJarExpansionService" title="Permalink to this definition">¶</a></dt>
 <dd><p>Bases: <a class="reference external" href="https://docs.python.org/2/library/functions.html#object" title="(in Python v2.7)"><code class="xref py py-class docutils literal"><span class="pre">object</span></code></a></p>
 <p>An expansion service based on an Java Jar file.</p>
 <p>This can be passed into an ExternalTransform as the expansion_service
 argument which will spawn a subprocess using this jar to expand the
 transform.</p>
 <dl class="method">
 <dt id="apache_beam.transforms.external.JavaJarExpansionService.Expand">
 <code class="descname">Expand</code><span class="sig-paren">(</span><em>request</em>, <em>context</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/external.html#JavaJarExpansionService.Expand"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.external.JavaJarExpansionService.Expand" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>

 </dd></dl>

 <dl class="class">
 <dt id="apache_beam.transforms.external.BeamJarExpansionService">
 <em class="property">class </em><code class="descclassname">apache_beam.transforms.external.</code><code class="descname">BeamJarExpansionService</code><span class="sig-paren">(</span><em>gradle_target</em>, <em>extra_args=None</em>, <em>gradle_appendix=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/external.html#BeamJarExpansionService"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.external.BeamJarExpansionService" title="Permalink to this definition">¶</a></dt>
 <dd><p>Bases: <a class="reference internal" href="#apache_beam.transforms.external.JavaJarExpansionService" title="apache_beam.transforms.external.JavaJarExpansionService"><code class="xref py py-class docutils literal"><span class="pre">apache_beam.transforms.external.JavaJarExpansionService</span></code></a></p>
 <p>An expansion service based on an Beam Java Jar file.</p>
 <p>Attempts to use a locally-build copy of the jar based on the gradle target,
 if it exists, otherwise attempts to download it (with caching) from the
 apache maven repository.</p>
 </dd></dl>

 <dl class="function">
 <dt id="apache_beam.transforms.external.memoize">
 <code class="descclassname">apache_beam.transforms.external.</code><code class="descname">memoize</code><span class="sig-paren">(</span><em>func</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/apache_beam/transforms/external.html#memoize"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#apache_beam.transforms.external.memoize" title="Permalink to this definition">¶</a></dt>
 <dd></dd></dl>

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