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| <section id="transforming-futures-f-map-f-flat-map-mapexecutor-flatmapexecutor"> |
| <h1>Transforming futures: <code class="docutils literal notranslate"><span class="pre">f_map</span></code>, <code class="docutils literal notranslate"><span class="pre">f_flat_map</span></code>, <code class="docutils literal notranslate"><span class="pre">MapExecutor</span></code>, <code class="docutils literal notranslate"><span class="pre">FlatMapExecutor</span></code><a class="headerlink" href="#transforming-futures-f-map-f-flat-map-mapexecutor-flatmapexecutor" title="Permalink to this headline">¶</a></h1> |
| <p>The output value of a future can be mapped to other values using a |
| provided function.</p> |
| <section id="futures-api"> |
| <h2>Futures API<a class="headerlink" href="#futures-api" title="Permalink to this headline">¶</a></h2> |
| <dl class="py function"> |
| <dt class="sig sig-object py" id="more_executors.f_map"> |
| <span class="sig-prename descclassname"><span class="pre">more_executors.</span></span><span class="sig-name descname"><span class="pre">f_map</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">future</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">fn</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">error_fn</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#more_executors.f_map" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Map the output value of a future using the given functions.</p> |
| <p>Signature: <code class="code docutils literal notranslate"><span class="pre">Future<A>,</span> <span class="pre">fn<A⟶B></span> <span class="pre">⟶</span> <span class="pre">Future<B></span></code></p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters</dt> |
| <dd class="field-odd"><ul class="simple"> |
| <li><p><strong>future</strong> (<a class="reference external" href="https://docs.python.org/3/library/concurrent.futures.html#concurrent.futures.Future" title="(in Python v3.11)"><em>Future</em></a>) – Any future.</p></li> |
| <li><p><strong>fn</strong> (<em>callable</em>) – Any callable to be applied on successful futures. |
| This function is provided the result of the input future.</p></li> |
| <li><p><strong>error_fn</strong> (<em>callable</em>) – Any callable to be applied on unsuccessful futures. |
| This function is provided the exception of the input future.</p></li> |
| </ul> |
| </dd> |
| <dt class="field-even">Returns</dt> |
| <dd class="field-even"><p><dl class="simple"> |
| <dt><a class="reference external" href="https://docs.python.org/3/library/concurrent.futures.html#concurrent.futures.Future" title="(in Python v3.11)"><code class="xref py py-class docutils literal notranslate"><span class="pre">Future</span></code></a></dt><dd><p>A future resolved with:</p> |
| <ul class="simple"> |
| <li><p>the returned value of <code class="code docutils literal notranslate"><span class="pre">fn(future.result())</span></code></p></li> |
| <li><p>or the returned value of <code class="code docutils literal notranslate"><span class="pre">error_fn(future.exception())</span></code></p></li> |
| <li><p>or with the exception raised by <code class="xref py py-obj docutils literal notranslate"><span class="pre">future</span></code>, <code class="xref py py-obj docutils literal notranslate"><span class="pre">fn</span></code> or <code class="xref py py-obj docutils literal notranslate"><span class="pre">error_fn</span></code>.</p></li> |
| </ul> |
| </dd> |
| </dl> |
| </p> |
| </dd> |
| </dl> |
| <div class="versionadded"> |
| <p><span class="versionmodified added">New in version 1.19.0.</span></p> |
| </div> |
| <div class="versionchanged"> |
| <p><span class="versionmodified changed">Changed in version 2.2.0: </span>Introduced <code class="docutils literal notranslate"><span class="pre">error_fn</span></code>.</p> |
| </div> |
| </dd></dl> |
| |
| <dl class="py function"> |
| <dt class="sig sig-object py" id="more_executors.f_flat_map"> |
| <span class="sig-prename descclassname"><span class="pre">more_executors.</span></span><span class="sig-name descname"><span class="pre">f_flat_map</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">future</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">fn</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">error_fn</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#more_executors.f_flat_map" title="Permalink to this definition">¶</a></dt> |
| <dd><p>Map the output value of a future using the given future-returning functions.</p> |
| <p>Like <a class="reference internal" href="#more_executors.f_map" title="more_executors.f_map"><code class="xref py py-meth docutils literal notranslate"><span class="pre">f_map()</span></code></a>, except that the mapping functions must return a future, |
| and that future will be flattened into the output value (avoiding a nested future).</p> |
| <p>Signature: <code class="code docutils literal notranslate"><span class="pre">Future<A>,</span> <span class="pre">fn<A⟶Future<B>></span> <span class="pre">⟶</span> <span class="pre">Future<B></span></code></p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters</dt> |
| <dd class="field-odd"><ul class="simple"> |
| <li><p><strong>future</strong> (<a class="reference external" href="https://docs.python.org/3/library/concurrent.futures.html#concurrent.futures.Future" title="(in Python v3.11)"><em>Future</em></a>) – Any future.</p></li> |
| <li><p><strong>fn</strong> (<em>callable</em>) – Any future-returning callable to be applied on successful futures. |
| This function is provided the result of the input future.</p></li> |
| <li><p><strong>error_fn</strong> (<em>callable</em>) – Any future-returning callable to be applied on unsuccessful futures. |
| This function is provided the exception of the input future.</p></li> |
| </ul> |
| </dd> |
| <dt class="field-even">Returns</dt> |
| <dd class="field-even"><p><dl class="simple"> |
| <dt><a class="reference external" href="https://docs.python.org/3/library/concurrent.futures.html#concurrent.futures.Future" title="(in Python v3.11)"><code class="xref py py-class docutils literal notranslate"><span class="pre">Future</span></code></a></dt><dd><p>A future which is:</p> |
| <ul class="simple"> |
| <li><p>equivalent to that returned by <code class="xref py py-obj docutils literal notranslate"><span class="pre">fn</span></code> if input future succeeded</p></li> |
| <li><p>or equivalent to that returned by <code class="xref py py-obj docutils literal notranslate"><span class="pre">error_fn</span></code> if input future failed</p></li> |
| <li><p>or resolved with an exception if any of <code class="xref py py-obj docutils literal notranslate"><span class="pre">future</span></code>, <code class="xref py py-obj docutils literal notranslate"><span class="pre">fn</span></code> or |
| <code class="xref py py-obj docutils literal notranslate"><span class="pre">error_fn</span></code> failed</p></li> |
| </ul> |
| </dd> |
| </dl> |
| </p> |
| </dd> |
| </dl> |
| <div class="versionadded"> |
| <p><span class="versionmodified added">New in version 1.19.0.</span></p> |
| </div> |
| <div class="versionchanged"> |
| <p><span class="versionmodified changed">Changed in version 2.2.0: </span>Introduced <code class="docutils literal notranslate"><span class="pre">error_fn</span></code>.</p> |
| </div> |
| </dd></dl> |
| |
| </section> |
| <section id="executors-api"> |
| <h2>Executors API<a class="headerlink" href="#executors-api" title="Permalink to this headline">¶</a></h2> |
| <dl class="py class"> |
| <dt class="sig sig-object py" id="more_executors.MapExecutor"> |
| <em class="property"><span class="pre">class</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">more_executors.</span></span><span class="sig-name descname"><span class="pre">MapExecutor</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">delegate</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">fn</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">logger</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">name</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">'default'</span></span></em>, <em class="sig-param"><span class="o"><span class="pre">**</span></span><span class="n"><span class="pre">kwargs</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#more_executors.MapExecutor" title="Permalink to this definition">¶</a></dt> |
| <dd><p>An executor which delegates to another executor while mapping |
| output values/exceptions through given functions.</p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters</dt> |
| <dd class="field-odd"><ul class="simple"> |
| <li><p><strong>delegate</strong> (<a class="reference external" href="https://docs.python.org/3/library/concurrent.futures.html#concurrent.futures.Executor" title="(in Python v3.11)"><em>Executor</em></a>) – an executor to which callables will be submitted</p></li> |
| <li><p><strong>fn</strong> (<em>callable</em>) – <p>a callable applied to transform returned values |
| of successful futures.</p> |
| <p>This callable will be invoked with a single argument: |
| the <code class="docutils literal notranslate"><span class="pre">result()</span></code> returned from a successful future.</p> |
| <p>If omitted, no transformation occurs on <code class="docutils literal notranslate"><span class="pre">result()</span></code>.</p> |
| </p></li> |
| <li><p><strong>error_fn</strong> (<em>callable</em>) – <p>a callable applied to transform returned values |
| of unsuccessful futures.</p> |
| <p>This callable will be invoked with a single argument: |
| the <code class="docutils literal notranslate"><span class="pre">exception()</span></code> returned from a failed future.</p> |
| <p>If omitted, no transformation occurs on <code class="docutils literal notranslate"><span class="pre">exception()</span></code>.</p> |
| </p></li> |
| <li><p><strong>logger</strong> (<a class="reference external" href="https://docs.python.org/3/library/logging.html#logging.Logger" title="(in Python v3.11)"><em>Logger</em></a>) – a logger used for messages from this executor</p></li> |
| <li><p><strong>name</strong> (<a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.11)"><em>str</em></a>) – a name for this executor</p></li> |
| </ul> |
| </dd> |
| </dl> |
| <div class="versionchanged"> |
| <p><span class="versionmodified changed">Changed in version 2.2.0: </span>Introduced <code class="docutils literal notranslate"><span class="pre">error_fn</span></code>.</p> |
| </div> |
| <div class="versionchanged"> |
| <p><span class="versionmodified changed">Changed in version 2.7.0: </span>Introduced <code class="docutils literal notranslate"><span class="pre">name</span></code>.</p> |
| </div> |
| </dd></dl> |
| |
| <dl class="py method"> |
| <dt class="sig sig-object py" id="more_executors.Executors.with_map"> |
| <em class="property"><span class="pre">classmethod</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">Executors.</span></span><span class="sig-name descname"><span class="pre">with_map</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">executor</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">fn</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">error_fn</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">logger</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#more_executors.Executors.with_map" title="Permalink to this definition">¶</a></dt> |
| <dd><dl class="field-list simple"> |
| <dt class="field-odd">Returns</dt> |
| <dd class="field-odd"><p>a new executor which will transform results through the given function</p> |
| </dd> |
| <dt class="field-even">Return type</dt> |
| <dd class="field-even"><p><a class="reference internal" href="#more_executors.MapExecutor" title="more_executors.MapExecutor"><em>MapExecutor</em></a></p> |
| </dd> |
| </dl> |
| </dd></dl> |
| |
| <dl class="py class"> |
| <dt class="sig sig-object py" id="more_executors.FlatMapExecutor"> |
| <em class="property"><span class="pre">class</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">more_executors.</span></span><span class="sig-name descname"><span class="pre">FlatMapExecutor</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">delegate</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">fn</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">logger</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">name</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">'default'</span></span></em>, <em class="sig-param"><span class="o"><span class="pre">**</span></span><span class="n"><span class="pre">kwargs</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#more_executors.FlatMapExecutor" title="Permalink to this definition">¶</a></dt> |
| <dd><p>An executor which delegates to another executor while mapping |
| output values through given future-producing functions.</p> |
| <p>This executor behaves like <a class="reference internal" href="#more_executors.MapExecutor" title="more_executors.MapExecutor"><code class="xref py py-class docutils literal notranslate"><span class="pre">MapExecutor</span></code></a>, |
| except that the given mapping/error functions must return instances of |
| <a class="reference external" href="https://docs.python.org/3/library/concurrent.futures.html#concurrent.futures.Future" title="(in Python v3.11)"><code class="xref py py-class docutils literal notranslate"><span class="pre">Future</span></code></a>, and the mapped future is |
| flattened into the future returned from this executor. |
| This allows chaining multiple future-producing functions into a single |
| future.</p> |
| <ul class="simple"> |
| <li><p>If the map/error function returns a <a class="reference external" href="https://docs.python.org/3/library/concurrent.futures.html#concurrent.futures.Future" title="(in Python v3.11)"><code class="xref py py-class docutils literal notranslate"><span class="pre">Future</span></code></a>, the |
| result/exception of that future will be propagated to the future returned |
| by this executor.</p></li> |
| <li><p>If the map/error function returns any other type, the returned future will fail |
| with a <a class="reference external" href="https://docs.python.org/3/library/exceptions.html#TypeError" title="(in Python v3.11)"><code class="xref py py-class docutils literal notranslate"><span class="pre">TypeError</span></code></a>.</p></li> |
| <li><p>If the map/error function raises an exception, the returned future will fail |
| with that exception.</p></li> |
| </ul> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters</dt> |
| <dd class="field-odd"><ul class="simple"> |
| <li><p><strong>delegate</strong> (<a class="reference external" href="https://docs.python.org/3/library/concurrent.futures.html#concurrent.futures.Executor" title="(in Python v3.11)"><em>Executor</em></a>) – an executor to which callables will be submitted</p></li> |
| <li><p><strong>fn</strong> (<em>callable</em>) – <p>a callable applied to transform returned values |
| of successful futures.</p> |
| <p>This callable will be invoked with a single argument: |
| the <code class="docutils literal notranslate"><span class="pre">result()</span></code> returned from a successful future.</p> |
| <p>If omitted, no transformation occurs on <code class="docutils literal notranslate"><span class="pre">result()</span></code>.</p> |
| </p></li> |
| <li><p><strong>error_fn</strong> (<em>callable</em>) – <p>a callable applied to transform returned values |
| of unsuccessful futures.</p> |
| <p>This callable will be invoked with a single argument: |
| the <code class="docutils literal notranslate"><span class="pre">exception()</span></code> returned from a failed future.</p> |
| <p>If omitted, no transformation occurs on <code class="docutils literal notranslate"><span class="pre">exception()</span></code>.</p> |
| </p></li> |
| <li><p><strong>logger</strong> (<a class="reference external" href="https://docs.python.org/3/library/logging.html#logging.Logger" title="(in Python v3.11)"><em>Logger</em></a>) – a logger used for messages from this executor</p></li> |
| <li><p><strong>name</strong> (<a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.11)"><em>str</em></a>) – a name for this executor</p></li> |
| </ul> |
| </dd> |
| </dl> |
| <div class="versionchanged"> |
| <p><span class="versionmodified changed">Changed in version 2.2.0: </span>Introduced <code class="docutils literal notranslate"><span class="pre">error_fn</span></code>.</p> |
| </div> |
| <div class="versionchanged"> |
| <p><span class="versionmodified changed">Changed in version 2.7.0: </span>Introduced <code class="docutils literal notranslate"><span class="pre">name</span></code>.</p> |
| </div> |
| </dd></dl> |
| |
| <dl class="py method"> |
| <dt class="sig sig-object py" id="more_executors.Executors.with_flat_map"> |
| <em class="property"><span class="pre">classmethod</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">Executors.</span></span><span class="sig-name descname"><span class="pre">with_flat_map</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">executor</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">fn</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">error_fn</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">logger</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#more_executors.Executors.with_flat_map" title="Permalink to this definition">¶</a></dt> |
| <dd><dl class="field-list simple"> |
| <dt class="field-odd">Returns</dt> |
| <dd class="field-odd"><p>a new executor which will transform results through the given |
| <a class="reference external" href="https://docs.python.org/3/library/concurrent.futures.html#concurrent.futures.Future" title="(in Python v3.11)"><code class="xref py py-class docutils literal notranslate"><span class="pre">Future</span></code></a>-providing function</p> |
| </dd> |
| <dt class="field-even">Return type</dt> |
| <dd class="field-even"><p><a class="reference internal" href="#more_executors.FlatMapExecutor" title="more_executors.FlatMapExecutor"><em>FlatMapExecutor</em></a></p> |
| </dd> |
| </dl> |
| <div class="versionadded"> |
| <p><span class="versionmodified added">New in version 1.12.0.</span></p> |
| </div> |
| </dd></dl> |
| |
| </section> |
| </section> |
| |
| |
| </div> |
| |
| </div> |
| </div> |
| <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> |
| <div class="sphinxsidebarwrapper"> |
| <h1 class="logo"><a href="../index.html">more-executors</a></h1> |
| |
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| |
| <p class="blurb">A library of composable Python executors and futures</p> |
| |
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| <h3>Navigation</h3> |
| <p class="caption" role="heading"><span class="caption-text">Contents:</span></p> |
| <ul class="current"> |
| <li class="toctree-l1"><a class="reference internal" href="../user-guide.html">User Guide</a></li> |
| <li class="toctree-l1 current"><a class="reference internal" href="../api-reference.html">Reference</a><ul class="current"> |
| <li class="toctree-l2"><a class="reference internal" href="base-executors.html">Base executors: <code class="docutils literal notranslate"><span class="pre">thread_pool</span></code>, <code class="docutils literal notranslate"><span class="pre">process_pool</span></code>, <code class="docutils literal notranslate"><span class="pre">sync</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="retry.html">Retrying: <code class="docutils literal notranslate"><span class="pre">RetryExecutor</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="throttle.html">Throttling: <code class="docutils literal notranslate"><span class="pre">ThrottleExecutor</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="timeout.html">Timing out futures: <code class="docutils literal notranslate"><span class="pre">f_timeout</span></code>, <code class="docutils literal notranslate"><span class="pre">TimeoutExecutor</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="cancel.html">Cancellation of futures: <code class="docutils literal notranslate"><span class="pre">f_nocancel</span></code>, <code class="docutils literal notranslate"><span class="pre">CancelOnShutdownExecutor</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="poll.html">Polling: <code class="docutils literal notranslate"><span class="pre">PollExecutor</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="asyncio.html">asyncio bridge: <code class="docutils literal notranslate"><span class="pre">AsyncioExecutor</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="bind.html">Binding callables to executors: <code class="docutils literal notranslate"><span class="pre">bind</span></code>, <code class="docutils literal notranslate"><span class="pre">flat_bind</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="futures-create.html">Creating futures from values: <code class="docutils literal notranslate"><span class="pre">f_return*</span></code></a></li> |
| <li class="toctree-l2 current"><a class="current reference internal" href="#">Transforming futures: <code class="docutils literal notranslate"><span class="pre">f_map</span></code>, <code class="docutils literal notranslate"><span class="pre">f_flat_map</span></code>, <code class="docutils literal notranslate"><span class="pre">MapExecutor</span></code>, <code class="docutils literal notranslate"><span class="pre">FlatMapExecutor</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="futures-proxy.html">Proxy futures: <code class="docutils literal notranslate"><span class="pre">f_proxy</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="futures-apply.html">Applying functions: <code class="docutils literal notranslate"><span class="pre">f_apply</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="futures-bool.html">Boolean operations: <code class="docutils literal notranslate"><span class="pre">f_or</span></code>, <code class="docutils literal notranslate"><span class="pre">f_and</span></code></a></li> |
| <li class="toctree-l2"><a class="reference internal" href="futures-lists.html">Futures and sequences: <code class="docutils literal notranslate"><span class="pre">f_traverse</span></code>, <code class="docutils literal notranslate"><span class="pre">f_sequence</span></code>, <code class="docutils literal notranslate"><span class="pre">f_zip</span></code></a></li> |
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