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  <h1>Source code for grpc.framework.base.util</h1><div class="highlight"><pre>
<span></span><span class="c1"># Copyright 2015, Google Inc.</span>
<span class="c1"># All rights reserved.</span>
<span class="c1">#</span>
<span class="c1"># Redistribution and use in source and binary forms, with or without</span>
<span class="c1"># modification, are permitted provided that the following conditions are</span>
<span class="c1"># met:</span>
<span class="c1">#</span>
<span class="c1">#     * Redistributions of source code must retain the above copyright</span>
<span class="c1"># notice, this list of conditions and the following disclaimer.</span>
<span class="c1">#     * Redistributions in binary form must reproduce the above</span>
<span class="c1"># copyright notice, this list of conditions and the following disclaimer</span>
<span class="c1"># in the documentation and/or other materials provided with the</span>
<span class="c1"># distribution.</span>
<span class="c1">#     * Neither the name of Google Inc. nor the names of its</span>
<span class="c1"># contributors may be used to endorse or promote products derived from</span>
<span class="c1"># this software without specific prior written permission.</span>
<span class="c1">#</span>
<span class="c1"># THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS</span>
<span class="c1"># &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT</span>
<span class="c1"># LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR</span>
<span class="c1"># A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT</span>
<span class="c1"># OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,</span>
<span class="c1"># SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT</span>
<span class="c1"># LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,</span>
<span class="c1"># DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY</span>
<span class="c1"># THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT</span>
<span class="c1"># (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE</span>
<span class="c1"># OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>

<span class="sd">&quot;&quot;&quot;Utilities helpful for working with the base layer of RPC Framework.&quot;&quot;&quot;</span>

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

<span class="kn">from</span> <span class="nn">grpc.framework.base</span> <span class="k">import</span> <span class="n">interfaces</span>


<span class="k">class</span> <span class="nc">_ServicedSubscription</span><span class="p">(</span>
    <span class="n">collections</span><span class="o">.</span><span class="n">namedtuple</span><span class="p">(</span><span class="s1">&#39;_ServicedSubscription&#39;</span><span class="p">,</span> <span class="p">[</span><span class="s1">&#39;kind&#39;</span><span class="p">,</span> <span class="s1">&#39;ingestor&#39;</span><span class="p">]),</span>
    <span class="n">interfaces</span><span class="o">.</span><span class="n">ServicedSubscription</span><span class="p">):</span>
  <span class="sd">&quot;&quot;&quot;See interfaces.ServicedSubscription for specification.&quot;&quot;&quot;</span>

<span class="n">_NONE_SUBSCRIPTION</span> <span class="o">=</span> <span class="n">_ServicedSubscription</span><span class="p">(</span>
    <span class="n">interfaces</span><span class="o">.</span><span class="n">ServicedSubscription</span><span class="o">.</span><span class="n">Kind</span><span class="o">.</span><span class="n">NONE</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="n">_TERMINATION_ONLY_SUBSCRIPTION</span> <span class="o">=</span> <span class="n">_ServicedSubscription</span><span class="p">(</span>
    <span class="n">interfaces</span><span class="o">.</span><span class="n">ServicedSubscription</span><span class="o">.</span><span class="n">Kind</span><span class="o">.</span><span class="n">TERMINATION_ONLY</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>


<div class="viewcode-block" id="none_serviced_subscription"><a class="viewcode-back" href="../../../../grpc.framework.base.html#grpc.framework.base.util.none_serviced_subscription">[docs]</a><span class="k">def</span> <span class="nf">none_serviced_subscription</span><span class="p">():</span>
  <span class="sd">&quot;&quot;&quot;Creates a &quot;none&quot; interfaces.ServicedSubscription object.</span>

<span class="sd">  Returns:</span>
<span class="sd">    An interfaces.ServicedSubscription indicating no subscription to an</span>
<span class="sd">      operation&#39;s results (such as would be the case for a fire-and-forget</span>
<span class="sd">      operation invocation).</span>
<span class="sd">  &quot;&quot;&quot;</span>
  <span class="k">return</span> <span class="n">_NONE_SUBSCRIPTION</span></div>


<div class="viewcode-block" id="termination_only_serviced_subscription"><a class="viewcode-back" href="../../../../grpc.framework.base.html#grpc.framework.base.util.termination_only_serviced_subscription">[docs]</a><span class="k">def</span> <span class="nf">termination_only_serviced_subscription</span><span class="p">():</span>
  <span class="sd">&quot;&quot;&quot;Creates a &quot;termination only&quot; interfaces.ServicedSubscription object.</span>

<span class="sd">  Returns:</span>
<span class="sd">    An interfaces.ServicedSubscription indicating that the front-side customer</span>
<span class="sd">      is interested only in the overall termination outcome of the operation</span>
<span class="sd">      (such as completion or expiration) and would ignore the actual results of</span>
<span class="sd">      the operation.</span>
<span class="sd">  &quot;&quot;&quot;</span>
  <span class="k">return</span> <span class="n">_TERMINATION_ONLY_SUBSCRIPTION</span></div>


<div class="viewcode-block" id="full_serviced_subscription"><a class="viewcode-back" href="../../../../grpc.framework.base.html#grpc.framework.base.util.full_serviced_subscription">[docs]</a><span class="k">def</span> <span class="nf">full_serviced_subscription</span><span class="p">(</span><span class="n">ingestor</span><span class="p">):</span>
  <span class="sd">&quot;&quot;&quot;Creates a &quot;full&quot; interfaces.ServicedSubscription object.</span>

<span class="sd">  Args:</span>
<span class="sd">    ingestor: An interfaces.ServicedIngestor.</span>

<span class="sd">  Returns:</span>
<span class="sd">    An interfaces.ServicedSubscription object indicating a full</span>
<span class="sd">      subscription.</span>
<span class="sd">  &quot;&quot;&quot;</span>
  <span class="k">return</span> <span class="n">_ServicedSubscription</span><span class="p">(</span>
      <span class="n">interfaces</span><span class="o">.</span><span class="n">ServicedSubscription</span><span class="o">.</span><span class="n">Kind</span><span class="o">.</span><span class="n">FULL</span><span class="p">,</span> <span class="n">ingestor</span><span class="p">)</span></div>


<div class="viewcode-block" id="wait_for_idle"><a class="viewcode-back" href="../../../../grpc.framework.base.html#grpc.framework.base.util.wait_for_idle">[docs]</a><span class="k">def</span> <span class="nf">wait_for_idle</span><span class="p">(</span><span class="n">end</span><span class="p">):</span>
  <span class="sd">&quot;&quot;&quot;Waits for an interfaces.End to complete all operations.</span>

<span class="sd">  Args:</span>
<span class="sd">    end: Any interfaces.End.</span>
<span class="sd">  &quot;&quot;&quot;</span>
  <span class="n">event</span> <span class="o">=</span> <span class="n">threading</span><span class="o">.</span><span class="n">Event</span><span class="p">()</span>
  <span class="n">end</span><span class="o">.</span><span class="n">add_idle_action</span><span class="p">(</span><span class="n">event</span><span class="o">.</span><span class="n">set</span><span class="p">)</span>
  <span class="n">event</span><span class="o">.</span><span class="n">wait</span><span class="p">()</span></div>
</pre></div>

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