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   <h1>Source code for apache_beam.runners.interactive.options.capture_limiters</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;Module to condition how Interactive Beam stops capturing data.</span>

 <span class="sd">For internal use only; no backwards-compatibility guarantees.</span>
 <span class="sd">&quot;&quot;&quot;</span>

 <span class="kn">import</span> <span class="nn">threading</span>

 <span class="kn">import</span> <span class="nn">pandas</span> <span class="k">as</span> <span class="nn">pd</span>

 <span class="kn">from</span> <span class="nn">apache_beam.portability.api.beam_interactive_api_pb2</span> <span class="kn">import</span> <span class="n">TestStreamFileHeader</span>
 <span class="kn">from</span> <span class="nn">apache_beam.portability.api.beam_interactive_api_pb2</span> <span class="kn">import</span> <span class="n">TestStreamFileRecord</span>
 <span class="kn">from</span> <span class="nn">apache_beam.portability.api.beam_runner_api_pb2</span> <span class="kn">import</span> <span class="n">TestStreamPayload</span>
 <span class="kn">from</span> <span class="nn">apache_beam.runners.interactive</span> <span class="kn">import</span> <span class="n">interactive_environment</span> <span class="k">as</span> <span class="n">ie</span>
 <span class="kn">from</span> <span class="nn">apache_beam.utils.windowed_value</span> <span class="kn">import</span> <span class="n">WindowedValue</span>


 <div class="viewcode-block" id="Limiter"><a class="viewcode-back" href="../../../../../apache_beam.runners.interactive.options.capture_limiters.html#apache_beam.runners.interactive.options.capture_limiters.Limiter">[docs]</a><span class="k">class</span> <span class="nc">Limiter</span><span class="p">:</span>
   <span class="sd">&quot;&quot;&quot;Limits an aspect of the caching layer.&quot;&quot;&quot;</span>
 <div class="viewcode-block" id="Limiter.is_triggered"><a class="viewcode-back" href="../../../../../apache_beam.runners.interactive.options.capture_limiters.html#apache_beam.runners.interactive.options.capture_limiters.Limiter.is_triggered">[docs]</a>  <span class="k">def</span> <span class="nf">is_triggered</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
     <span class="c1"># type: () -&gt; bool</span>

     <span class="sd">&quot;&quot;&quot;Returns True if the limiter has triggered, and caching should stop.&quot;&quot;&quot;</span>
     <span class="k">raise</span> <span class="ne">NotImplementedError</span></div></div>


 <div class="viewcode-block" id="ElementLimiter"><a class="viewcode-back" href="../../../../../apache_beam.runners.interactive.options.capture_limiters.html#apache_beam.runners.interactive.options.capture_limiters.ElementLimiter">[docs]</a><span class="k">class</span> <span class="nc">ElementLimiter</span><span class="p">(</span><span class="n">Limiter</span><span class="p">):</span>
   <span class="sd">&quot;&quot;&quot;A `Limiter` that limits reading from cache based on some property of an</span>
 <span class="sd">  element.</span>
 <span class="sd">  &quot;&quot;&quot;</span>
 <div class="viewcode-block" id="ElementLimiter.update"><a class="viewcode-back" href="../../../../../apache_beam.runners.interactive.options.capture_limiters.html#apache_beam.runners.interactive.options.capture_limiters.ElementLimiter.update">[docs]</a>  <span class="k">def</span> <span class="nf">update</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">e</span><span class="p">):</span>
     <span class="c1"># type: (Any) -&gt; None</span>

     <span class="sd">&quot;&quot;&quot;Update the internal state based on some property of an element.</span>

 <span class="sd">    This is executed on every element that is read from cache.</span>
 <span class="sd">    &quot;&quot;&quot;</span>
     <span class="k">raise</span> <span class="ne">NotImplementedError</span></div></div>


 <div class="viewcode-block" id="SizeLimiter"><a class="viewcode-back" href="../../../../../apache_beam.runners.interactive.options.capture_limiters.html#apache_beam.runners.interactive.options.capture_limiters.SizeLimiter">[docs]</a><span class="k">class</span> <span class="nc">SizeLimiter</span><span class="p">(</span><span class="n">Limiter</span><span class="p">):</span>
   <span class="sd">&quot;&quot;&quot;Limits the cache size to a specified byte limit.&quot;&quot;&quot;</span>
   <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span>
       <span class="bp">self</span><span class="p">,</span>
       <span class="n">size_limit</span>  <span class="c1"># type: int</span>
   <span class="p">):</span>
     <span class="bp">self</span><span class="o">.</span><span class="n">_size_limit</span> <span class="o">=</span> <span class="n">size_limit</span>

 <div class="viewcode-block" id="SizeLimiter.is_triggered"><a class="viewcode-back" href="../../../../../apache_beam.runners.interactive.options.capture_limiters.html#apache_beam.runners.interactive.options.capture_limiters.SizeLimiter.is_triggered">[docs]</a>  <span class="k">def</span> <span class="nf">is_triggered</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
     <span class="n">total_capture_size</span> <span class="o">=</span> <span class="mi">0</span>
     <span class="n">ie</span><span class="o">.</span><span class="n">current_env</span><span class="p">()</span><span class="o">.</span><span class="n">track_user_pipelines</span><span class="p">()</span>
     <span class="k">for</span> <span class="n">user_pipeline</span> <span class="ow">in</span> <span class="n">ie</span><span class="o">.</span><span class="n">current_env</span><span class="p">()</span><span class="o">.</span><span class="n">tracked_user_pipelines</span><span class="p">:</span>
       <span class="n">cache_manager</span> <span class="o">=</span> <span class="n">ie</span><span class="o">.</span><span class="n">current_env</span><span class="p">()</span><span class="o">.</span><span class="n">get_cache_manager</span><span class="p">(</span><span class="n">user_pipeline</span><span class="p">)</span>
       <span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">cache_manager</span><span class="p">,</span> <span class="s1">&#39;capture_size&#39;</span><span class="p">):</span>
         <span class="n">total_capture_size</span> <span class="o">+=</span> <span class="n">cache_manager</span><span class="o">.</span><span class="n">capture_size</span>
     <span class="k">return</span> <span class="n">total_capture_size</span> <span class="o">&gt;=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_size_limit</span></div></div>


 <div class="viewcode-block" id="DurationLimiter"><a class="viewcode-back" href="../../../../../apache_beam.runners.interactive.options.capture_limiters.html#apache_beam.runners.interactive.options.capture_limiters.DurationLimiter">[docs]</a><span class="k">class</span> <span class="nc">DurationLimiter</span><span class="p">(</span><span class="n">Limiter</span><span class="p">):</span>
   <span class="sd">&quot;&quot;&quot;Limits the duration of the capture.&quot;&quot;&quot;</span>
   <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span>
       <span class="bp">self</span><span class="p">,</span>
       <span class="n">duration_limit</span>  <span class="c1"># type: datetime.timedelta</span>
   <span class="p">):</span>
     <span class="bp">self</span><span class="o">.</span><span class="n">_duration_limit</span> <span class="o">=</span> <span class="n">duration_limit</span>
     <span class="bp">self</span><span class="o">.</span><span class="n">_timer</span> <span class="o">=</span> <span class="n">threading</span><span class="o">.</span><span class="n">Timer</span><span class="p">(</span><span class="n">duration_limit</span><span class="o">.</span><span class="n">total_seconds</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">_trigger</span><span class="p">)</span>
     <span class="bp">self</span><span class="o">.</span><span class="n">_timer</span><span class="o">.</span><span class="n">daemon</span> <span class="o">=</span> <span class="kc">True</span>
     <span class="bp">self</span><span class="o">.</span><span class="n">_triggered</span> <span class="o">=</span> <span class="kc">False</span>
     <span class="bp">self</span><span class="o">.</span><span class="n">_timer</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>

   <span class="k">def</span> <span class="nf">_trigger</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
     <span class="bp">self</span><span class="o">.</span><span class="n">_triggered</span> <span class="o">=</span> <span class="kc">True</span>

 <div class="viewcode-block" id="DurationLimiter.is_triggered"><a class="viewcode-back" href="../../../../../apache_beam.runners.interactive.options.capture_limiters.html#apache_beam.runners.interactive.options.capture_limiters.DurationLimiter.is_triggered">[docs]</a>  <span class="k">def</span> <span class="nf">is_triggered</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">_triggered</span></div></div>


 <div class="viewcode-block" id="CountLimiter"><a class="viewcode-back" href="../../../../../apache_beam.runners.interactive.options.capture_limiters.html#apache_beam.runners.interactive.options.capture_limiters.CountLimiter">[docs]</a><span class="k">class</span> <span class="nc">CountLimiter</span><span class="p">(</span><span class="n">ElementLimiter</span><span class="p">):</span>
   <span class="sd">&quot;&quot;&quot;Limits by counting the number of elements seen.&quot;&quot;&quot;</span>
   <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">max_count</span><span class="p">):</span>
     <span class="bp">self</span><span class="o">.</span><span class="n">_max_count</span> <span class="o">=</span> <span class="n">max_count</span>
     <span class="bp">self</span><span class="o">.</span><span class="n">_count</span> <span class="o">=</span> <span class="mi">0</span>

 <div class="viewcode-block" id="CountLimiter.update"><a class="viewcode-back" href="../../../../../apache_beam.runners.interactive.options.capture_limiters.html#apache_beam.runners.interactive.options.capture_limiters.CountLimiter.update">[docs]</a>  <span class="k">def</span> <span class="nf">update</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">e</span><span class="p">):</span>
     <span class="c1"># A TestStreamFileRecord can contain many elements at once. If e is a file</span>
     <span class="c1"># record, then count the number of elements in the bundle.</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">TestStreamFileRecord</span><span class="p">):</span>
       <span class="k">if</span> <span class="ow">not</span> <span class="n">e</span><span class="o">.</span><span class="n">recorded_event</span><span class="o">.</span><span class="n">element_event</span><span class="p">:</span>
         <span class="k">return</span>
       <span class="bp">self</span><span class="o">.</span><span class="n">_count</span> <span class="o">+=</span> <span class="nb">len</span><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">recorded_event</span><span class="o">.</span><span class="n">element_event</span><span class="o">.</span><span class="n">elements</span><span class="p">)</span>

     <span class="c1"># Otherwise, count everything else but the header of the file since it is</span>
     <span class="c1"># not an element.</span>
     <span class="k">elif</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">e</span><span class="p">,</span> <span class="n">TestStreamFileHeader</span><span class="p">):</span>
       <span class="c1"># When elements are DataFrames, we want the output to be constrained by</span>
       <span class="c1"># how many rows we have read, not how many DataFrames we have read.</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">WindowedValue</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">e</span><span class="o">.</span><span class="n">value</span><span class="p">,</span> <span class="n">pd</span><span class="o">.</span><span class="n">DataFrame</span><span class="p">):</span>
         <span class="bp">self</span><span class="o">.</span><span class="n">_count</span> <span class="o">+=</span> <span class="nb">len</span><span class="p">(</span><span class="n">e</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">_count</span> <span class="o">+=</span> <span class="mi">1</span></div>

 <div class="viewcode-block" id="CountLimiter.is_triggered"><a class="viewcode-back" href="../../../../../apache_beam.runners.interactive.options.capture_limiters.html#apache_beam.runners.interactive.options.capture_limiters.CountLimiter.is_triggered">[docs]</a>  <span class="k">def</span> <span class="nf">is_triggered</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">_count</span> <span class="o">&gt;=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_max_count</span></div></div>


 <div class="viewcode-block" id="ProcessingTimeLimiter"><a class="viewcode-back" href="../../../../../apache_beam.runners.interactive.options.capture_limiters.html#apache_beam.runners.interactive.options.capture_limiters.ProcessingTimeLimiter">[docs]</a><span class="k">class</span> <span class="nc">ProcessingTimeLimiter</span><span class="p">(</span><span class="n">ElementLimiter</span><span class="p">):</span>
   <span class="sd">&quot;&quot;&quot;Limits by how long the ProcessingTime passed in the element stream.</span>

 <span class="sd">  Reads all elements from the timespan [start, start + duration).</span>

 <span class="sd">  This measures the duration from the first element in the stream. Each</span>
 <span class="sd">  subsequent element has a delta &quot;advance_duration&quot; that moves the internal</span>
 <span class="sd">  clock forward. This triggers when the duration from the internal clock and</span>
 <span class="sd">  the start exceeds the given duration.</span>
 <span class="sd">  &quot;&quot;&quot;</span>
   <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">max_duration_secs</span><span class="p">):</span>
     <span class="sd">&quot;&quot;&quot;Initialize the ProcessingTimeLimiter.&quot;&quot;&quot;</span>
     <span class="bp">self</span><span class="o">.</span><span class="n">_max_duration_us</span> <span class="o">=</span> <span class="n">max_duration_secs</span> <span class="o">*</span> <span class="mf">1e6</span>
     <span class="bp">self</span><span class="o">.</span><span class="n">_start_us</span> <span class="o">=</span> <span class="mi">0</span>
     <span class="bp">self</span><span class="o">.</span><span class="n">_cur_time_us</span> <span class="o">=</span> <span class="mi">0</span>

 <div class="viewcode-block" id="ProcessingTimeLimiter.update"><a class="viewcode-back" href="../../../../../apache_beam.runners.interactive.options.capture_limiters.html#apache_beam.runners.interactive.options.capture_limiters.ProcessingTimeLimiter.update">[docs]</a>  <span class="k">def</span> <span class="nf">update</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">e</span><span class="p">):</span>
     <span class="c1"># Only look at TestStreamFileRecords which hold the processing time.</span>
     <span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">e</span><span class="p">,</span> <span class="n">TestStreamPayload</span><span class="o">.</span><span class="n">Event</span><span class="p">):</span>
       <span class="k">return</span>

     <span class="k">if</span> <span class="ow">not</span> <span class="n">e</span><span class="o">.</span><span class="n">HasField</span><span class="p">(</span><span class="s1">&#39;processing_time_event&#39;</span><span class="p">):</span>
       <span class="k">return</span>

     <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_start_us</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
       <span class="bp">self</span><span class="o">.</span><span class="n">_start_us</span> <span class="o">=</span> <span class="n">e</span><span class="o">.</span><span class="n">processing_time_event</span><span class="o">.</span><span class="n">advance_duration</span>
     <span class="bp">self</span><span class="o">.</span><span class="n">_cur_time_us</span> <span class="o">+=</span> <span class="n">e</span><span class="o">.</span><span class="n">processing_time_event</span><span class="o">.</span><span class="n">advance_duration</span></div>

 <div class="viewcode-block" id="ProcessingTimeLimiter.is_triggered"><a class="viewcode-back" href="../../../../../apache_beam.runners.interactive.options.capture_limiters.html#apache_beam.runners.interactive.options.capture_limiters.ProcessingTimeLimiter.is_triggered">[docs]</a>  <span class="k">def</span> <span class="nf">is_triggered</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">_cur_time_us</span> <span class="o">-</span> <span class="bp">self</span><span class="o">.</span><span class="n">_start_us</span> <span class="o">&gt;=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_max_duration_us</span></div></div>
 </pre></div>

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