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  <h1>Source code for grpc.framework.foundation.logging_pool</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;A thread pool that logs exceptions raised by tasks executed within it.&quot;&quot;&quot;</span>

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

<span class="kn">from</span> <span class="nn">concurrent</span> <span class="k">import</span> <span class="n">futures</span>


<span class="k">def</span> <span class="nf">_wrap</span><span class="p">(</span><span class="n">behavior</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;Wraps an arbitrary callable behavior in exception-logging.&quot;&quot;&quot;</span>

    <span class="k">def</span> <span class="nf">_wrapping</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
        <span class="k">try</span><span class="p">:</span>
            <span class="k">return</span> <span class="n">behavior</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
        <span class="k">except</span> <span class="ne">Exception</span><span class="p">:</span>
            <span class="n">logging</span><span class="o">.</span><span class="n">exception</span><span class="p">(</span>
                <span class="s1">&#39;Unexpected exception from </span><span class="si">%s</span><span class="s1"> executed in logging pool!&#39;</span><span class="p">,</span>
                <span class="n">behavior</span><span class="p">)</span>
            <span class="k">raise</span>

    <span class="k">return</span> <span class="n">_wrapping</span>


<span class="k">class</span> <span class="nc">_LoggingPool</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;An exception-logging futures.ThreadPoolExecutor-compatible thread pool.&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">backing_pool</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_backing_pool</span> <span class="o">=</span> <span class="n">backing_pool</span>

    <span class="k">def</span> <span class="nf">__enter__</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="k">def</span> <span class="nf">__exit__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">exc_type</span><span class="p">,</span> <span class="n">exc_val</span><span class="p">,</span> <span class="n">exc_tb</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_backing_pool</span><span class="o">.</span><span class="n">shutdown</span><span class="p">(</span><span class="n">wait</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">submit</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">fn</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_backing_pool</span><span class="o">.</span><span class="n">submit</span><span class="p">(</span><span class="n">_wrap</span><span class="p">(</span><span class="n">fn</span><span class="p">),</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">map</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">func</span><span class="p">,</span> <span class="o">*</span><span class="n">iterables</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
        <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_backing_pool</span><span class="o">.</span><span class="n">map</span><span class="p">(</span>
            <span class="n">_wrap</span><span class="p">(</span><span class="n">func</span><span class="p">),</span> <span class="o">*</span><span class="n">iterables</span><span class="p">,</span> <span class="n">timeout</span><span class="o">=</span><span class="n">kwargs</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;timeout&#39;</span><span class="p">,</span> <span class="kc">None</span><span class="p">))</span>

    <span class="k">def</span> <span class="nf">shutdown</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">wait</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_backing_pool</span><span class="o">.</span><span class="n">shutdown</span><span class="p">(</span><span class="n">wait</span><span class="o">=</span><span class="n">wait</span><span class="p">)</span>


<div class="viewcode-block" id="pool"><a class="viewcode-back" href="../../../../grpc.framework.foundation.html#grpc.framework.foundation.logging_pool.pool">[docs]</a><span class="k">def</span> <span class="nf">pool</span><span class="p">(</span><span class="n">max_workers</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;Creates a thread pool that logs exceptions raised by the tasks within it.</span>

<span class="sd">  Args:</span>
<span class="sd">    max_workers: The maximum number of worker threads to allow the pool.</span>

<span class="sd">  Returns:</span>
<span class="sd">    A futures.ThreadPoolExecutor-compatible thread pool that logs exceptions</span>
<span class="sd">      raised by the tasks executed within it.</span>
<span class="sd">  &quot;&quot;&quot;</span>
    <span class="k">return</span> <span class="n">_LoggingPool</span><span class="p">(</span><span class="n">futures</span><span class="o">.</span><span class="n">ThreadPoolExecutor</span><span class="p">(</span><span class="n">max_workers</span><span class="p">))</span></div>
</pre></div>

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