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

<span class="sd">&quot;&quot;&quot;In-memory implementations of base layer interfaces.&quot;&quot;&quot;</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="kn">import</span> <span class="n">_constants</span>
<span class="kn">from</span> <span class="nn">grpc.framework.base</span> <span class="kn">import</span> <span class="n">interfaces</span>
<span class="kn">from</span> <span class="nn">grpc.framework.foundation</span> <span class="kn">import</span> <span class="n">callable_util</span>


<span class="k">class</span> <span class="nc">_Serializer</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
  <span class="sd">&quot;&quot;&quot;A utility for serializing values that may arrive concurrently.&quot;&quot;&quot;</span>

  <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">pool</span><span class="p">):</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_lock</span> <span class="o">=</span> <span class="n">threading</span><span class="o">.</span><span class="n">Lock</span><span class="p">()</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span> <span class="o">=</span> <span class="n">pool</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_sink</span> <span class="o">=</span> <span class="bp">None</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_spinning</span> <span class="o">=</span> <span class="bp">False</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_values</span> <span class="o">=</span> <span class="p">[]</span>

  <span class="k">def</span> <span class="nf">_spin</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">sink</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
    <span class="k">while</span> <span class="bp">True</span><span class="p">:</span>
      <span class="n">sink</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
      <span class="k">with</span> <span class="bp">self</span><span class="o">.</span><span class="n">_lock</span><span class="p">:</span>
        <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_sink</span> <span class="ow">is</span> <span class="bp">None</span> <span class="ow">or</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_values</span><span class="p">:</span>
          <span class="bp">self</span><span class="o">.</span><span class="n">_spinning</span> <span class="o">=</span> <span class="bp">False</span>
          <span class="k">return</span>
        <span class="k">else</span><span class="p">:</span>
          <span class="n">sink</span><span class="p">,</span> <span class="n">value</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_sink</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_values</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>

  <span class="k">def</span> <span class="nf">set_sink</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">sink</span><span class="p">):</span>
    <span class="k">with</span> <span class="bp">self</span><span class="o">.</span><span class="n">_lock</span><span class="p">:</span>
      <span class="bp">self</span><span class="o">.</span><span class="n">_sink</span> <span class="o">=</span> <span class="n">sink</span>
      <span class="k">if</span> <span class="n">sink</span> <span class="ow">is</span> <span class="ow">not</span> <span class="bp">None</span> <span class="ow">and</span> <span class="bp">self</span><span class="o">.</span><span class="n">_values</span> <span class="ow">and</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_spinning</span><span class="p">:</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_spinning</span> <span class="o">=</span> <span class="bp">True</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span><span class="o">.</span><span class="n">submit</span><span class="p">(</span>
            <span class="n">callable_util</span><span class="o">.</span><span class="n">with_exceptions_logged</span><span class="p">(</span>
                <span class="bp">self</span><span class="o">.</span><span class="n">_spin</span><span class="p">,</span> <span class="n">_constants</span><span class="o">.</span><span class="n">INTERNAL_ERROR_LOG_MESSAGE</span><span class="p">),</span>
            <span class="n">sink</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">_values</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="mi">0</span><span class="p">))</span>

  <span class="k">def</span> <span class="nf">add_value</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
    <span class="k">with</span> <span class="bp">self</span><span class="o">.</span><span class="n">_lock</span><span class="p">:</span>
      <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">_sink</span> <span class="ow">and</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">_spinning</span><span class="p">:</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_spinning</span> <span class="o">=</span> <span class="bp">True</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_pool</span><span class="o">.</span><span class="n">submit</span><span class="p">(</span>
            <span class="n">callable_util</span><span class="o">.</span><span class="n">with_exceptions_logged</span><span class="p">(</span>
                <span class="bp">self</span><span class="o">.</span><span class="n">_spin</span><span class="p">,</span> <span class="n">_constants</span><span class="o">.</span><span class="n">INTERNAL_ERROR_LOG_MESSAGE</span><span class="p">),</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">_sink</span><span class="p">,</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">_values</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>


<div class="viewcode-block" id="Link"><a class="viewcode-back" href="../../../../grpc.framework.base.html#grpc.framework.base.in_memory.Link">[docs]</a><span class="k">class</span> <span class="nc">Link</span><span class="p">(</span><span class="n">interfaces</span><span class="o">.</span><span class="n">ForeLink</span><span class="p">,</span> <span class="n">interfaces</span><span class="o">.</span><span class="n">RearLink</span><span class="p">):</span>
  <span class="sd">&quot;&quot;&quot;A trivial implementation of interfaces.ForeLink and interfaces.RearLink.&quot;&quot;&quot;</span>

  <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">pool</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;Constructor.</span>

<span class="sd">    Args:</span>
<span class="sd">      pool: A thread pool to be used for serializing ticket exchange in each</span>
<span class="sd">        direction.</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_front_to_back</span> <span class="o">=</span> <span class="n">_Serializer</span><span class="p">(</span><span class="n">pool</span><span class="p">)</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_back_to_front</span> <span class="o">=</span> <span class="n">_Serializer</span><span class="p">(</span><span class="n">pool</span><span class="p">)</span>

<div class="viewcode-block" id="Link.join_fore_link"><a class="viewcode-back" href="../../../../grpc.framework.base.html#grpc.framework.base.in_memory.Link.join_fore_link">[docs]</a>  <span class="k">def</span> <span class="nf">join_fore_link</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">fore_link</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;See interfaces.RearLink.join_fore_link for specification.&quot;&quot;&quot;</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_back_to_front</span><span class="o">.</span><span class="n">set_sink</span><span class="p">(</span><span class="n">fore_link</span><span class="o">.</span><span class="n">accept_back_to_front_ticket</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="Link.join_rear_link"><a class="viewcode-back" href="../../../../grpc.framework.base.html#grpc.framework.base.in_memory.Link.join_rear_link">[docs]</a>  <span class="k">def</span> <span class="nf">join_rear_link</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">rear_link</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;See interfaces.ForeLink.join_rear_link for specification.&quot;&quot;&quot;</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_front_to_back</span><span class="o">.</span><span class="n">set_sink</span><span class="p">(</span><span class="n">rear_link</span><span class="o">.</span><span class="n">accept_front_to_back_ticket</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="Link.accept_front_to_back_ticket"><a class="viewcode-back" href="../../../../grpc.framework.base.html#grpc.framework.base.in_memory.Link.accept_front_to_back_ticket">[docs]</a>  <span class="k">def</span> <span class="nf">accept_front_to_back_ticket</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">ticket</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;See interfaces.ForeLink.accept_front_to_back_ticket for specification.&quot;&quot;&quot;</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_front_to_back</span><span class="o">.</span><span class="n">add_value</span><span class="p">(</span><span class="n">ticket</span><span class="p">)</span>
</div>
<div class="viewcode-block" id="Link.accept_back_to_front_ticket"><a class="viewcode-back" href="../../../../grpc.framework.base.html#grpc.framework.base.in_memory.Link.accept_back_to_front_ticket">[docs]</a>  <span class="k">def</span> <span class="nf">accept_back_to_front_ticket</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">ticket</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;See interfaces.RearLink.accept_back_to_front_ticket for specification.&quot;&quot;&quot;</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">_back_to_front</span><span class="o">.</span><span class="n">add_value</span><span class="p">(</span><span class="n">ticket</span><span class="p">)</span></div></div>
</pre></div>

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