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  <div class="section" id="module-tornado.platform.twisted">
<span id="tornado-platform-twisted-bridges-between-twisted-and-tornado"></span><h1><code class="docutils literal"><span class="pre">tornado.platform.twisted</span></code> &#8212; Bridges between Twisted and Tornado<a class="headerlink" href="#module-tornado.platform.twisted" title="Permalink to this headline"></a></h1>
<p>Bridges between the Twisted reactor and Tornado IOLoop.</p>
<p>This module lets you run applications and libraries written for
Twisted in a Tornado application.  It can be used in two modes,
depending on which library&#8217;s underlying event loop you want to use.</p>
<p>This module has been tested with Twisted versions 11.0.0 and newer.</p>
<div class="section" id="twisted-on-tornado">
<h2>Twisted on Tornado<a class="headerlink" href="#twisted-on-tornado" title="Permalink to this headline"></a></h2>
<dl class="class">
<dt id="tornado.platform.twisted.TornadoReactor">
<em class="property">class </em><code class="descclassname">tornado.platform.twisted.</code><code class="descname">TornadoReactor</code><span class="sig-paren">(</span><em>io_loop=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/tornado/platform/twisted.html#TornadoReactor"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#tornado.platform.twisted.TornadoReactor" title="Permalink to this definition"></a></dt>
<dd><p>Twisted reactor built on the Tornado IOLoop.</p>
<p><a class="reference internal" href="#tornado.platform.twisted.TornadoReactor" title="tornado.platform.twisted.TornadoReactor"><code class="xref py py-obj docutils literal"><span class="pre">TornadoReactor</span></code></a> implements the Twisted reactor interface on top of
the Tornado IOLoop.  To use it, simply call <a class="reference internal" href="#tornado.platform.twisted.install" title="tornado.platform.twisted.install"><code class="xref py py-obj docutils literal"><span class="pre">install</span></code></a> at the beginning
of the application:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">tornado.platform.twisted</span>
<span class="n">tornado</span><span class="o">.</span><span class="n">platform</span><span class="o">.</span><span class="n">twisted</span><span class="o">.</span><span class="n">install</span><span class="p">()</span>
<span class="kn">from</span> <span class="nn">twisted.internet</span> <span class="k">import</span> <span class="n">reactor</span>
</pre></div>
</div>
<p>When the app is ready to start, call <code class="docutils literal"><span class="pre">IOLoop.current().start()</span></code>
instead of <code class="docutils literal"><span class="pre">reactor.run()</span></code>.</p>
<p>It is also possible to create a non-global reactor by calling
<code class="docutils literal"><span class="pre">tornado.platform.twisted.TornadoReactor(io_loop)</span></code>.  However, if
the <a class="reference internal" href="ioloop.html#tornado.ioloop.IOLoop" title="tornado.ioloop.IOLoop"><code class="xref py py-obj docutils literal"><span class="pre">IOLoop</span></code></a> and reactor are to be short-lived (such as those used in
unit tests), additional cleanup may be required.  Specifically, it is
recommended to call:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">reactor</span><span class="o">.</span><span class="n">fireSystemEvent</span><span class="p">(</span><span class="s1">&#39;shutdown&#39;</span><span class="p">)</span>
<span class="n">reactor</span><span class="o">.</span><span class="n">disconnectAll</span><span class="p">()</span>
</pre></div>
</div>
<p>before closing the <a class="reference internal" href="ioloop.html#tornado.ioloop.IOLoop" title="tornado.ioloop.IOLoop"><code class="xref py py-obj docutils literal"><span class="pre">IOLoop</span></code></a>.</p>
<div class="versionchanged">
<p><span class="versionmodified">Changed in version 4.1: </span>The <code class="docutils literal"><span class="pre">io_loop</span></code> argument is deprecated.</p>
</div>
</dd></dl>

<dl class="function">
<dt id="tornado.platform.twisted.install">
<code class="descclassname">tornado.platform.twisted.</code><code class="descname">install</code><span class="sig-paren">(</span><em>io_loop=None</em><span class="sig-paren">)</span><a class="reference internal" href="_modules/tornado/platform/twisted.html#install"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#tornado.platform.twisted.install" title="Permalink to this definition"></a></dt>
<dd><p>Install this package as the default Twisted reactor.</p>
<p><code class="docutils literal"><span class="pre">install()</span></code> must be called very early in the startup process,
before most other twisted-related imports. Conversely, because it
initializes the <a class="reference internal" href="ioloop.html#tornado.ioloop.IOLoop" title="tornado.ioloop.IOLoop"><code class="xref py py-obj docutils literal"><span class="pre">IOLoop</span></code></a>, it cannot be called before
<a class="reference internal" href="process.html#tornado.process.fork_processes" title="tornado.process.fork_processes"><code class="xref py py-obj docutils literal"><span class="pre">fork_processes</span></code></a> or multi-process <a class="reference internal" href="tcpserver.html#tornado.tcpserver.TCPServer.start" title="tornado.tcpserver.TCPServer.start"><code class="xref py py-obj docutils literal"><span class="pre">start</span></code></a>. These
conflicting requirements make it difficult to use <a class="reference internal" href="#tornado.platform.twisted.TornadoReactor" title="tornado.platform.twisted.TornadoReactor"><code class="xref py py-obj docutils literal"><span class="pre">TornadoReactor</span></code></a>
in multi-process mode, and an external process manager such as
<code class="docutils literal"><span class="pre">supervisord</span></code> is recommended instead.</p>
<div class="versionchanged">
<p><span class="versionmodified">Changed in version 4.1: </span>The <code class="docutils literal"><span class="pre">io_loop</span></code> argument is deprecated.</p>
</div>
</dd></dl>

</div>
<div class="section" id="tornado-on-twisted">
<h2>Tornado on Twisted<a class="headerlink" href="#tornado-on-twisted" title="Permalink to this headline"></a></h2>
<dl class="class">
<dt id="tornado.platform.twisted.TwistedIOLoop">
<em class="property">class </em><code class="descclassname">tornado.platform.twisted.</code><code class="descname">TwistedIOLoop</code><a class="reference internal" href="_modules/tornado/platform/twisted.html#TwistedIOLoop"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#tornado.platform.twisted.TwistedIOLoop" title="Permalink to this definition"></a></dt>
<dd><p>IOLoop implementation that runs on Twisted.</p>
<p><a class="reference internal" href="#tornado.platform.twisted.TwistedIOLoop" title="tornado.platform.twisted.TwistedIOLoop"><code class="xref py py-obj docutils literal"><span class="pre">TwistedIOLoop</span></code></a> implements the Tornado IOLoop interface on top of
the Twisted reactor. Recommended usage:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">tornado.platform.twisted</span> <span class="k">import</span> <span class="n">TwistedIOLoop</span>
<span class="kn">from</span> <span class="nn">twisted.internet</span> <span class="k">import</span> <span class="n">reactor</span>
<span class="n">TwistedIOLoop</span><span class="p">()</span><span class="o">.</span><span class="n">install</span><span class="p">()</span>
<span class="c1"># Set up your tornado application as usual using `IOLoop.instance`</span>
<span class="n">reactor</span><span class="o">.</span><span class="n">run</span><span class="p">()</span>
</pre></div>
</div>
<p>Uses the global Twisted reactor by default.  To create multiple
<code class="docutils literal"><span class="pre">TwistedIOLoops</span></code> in the same process, you must pass a unique reactor
when constructing each one.</p>
<p>Not compatible with <a class="reference internal" href="process.html#tornado.process.Subprocess.set_exit_callback" title="tornado.process.Subprocess.set_exit_callback"><code class="xref py py-obj docutils literal"><span class="pre">tornado.process.Subprocess.set_exit_callback</span></code></a>
because the <code class="docutils literal"><span class="pre">SIGCHLD</span></code> handlers used by Tornado and Twisted conflict
with each other.</p>
<p>See also <a class="reference internal" href="ioloop.html#tornado.ioloop.IOLoop.install" title="tornado.ioloop.IOLoop.install"><code class="xref py py-meth docutils literal"><span class="pre">tornado.ioloop.IOLoop.install()</span></code></a> for general notes on
installing alternative IOLoops.</p>
</dd></dl>

</div>
<div class="section" id="twisted-dns-resolver">
<h2>Twisted DNS resolver<a class="headerlink" href="#twisted-dns-resolver" title="Permalink to this headline"></a></h2>
<dl class="class">
<dt id="tornado.platform.twisted.TwistedResolver">
<em class="property">class </em><code class="descclassname">tornado.platform.twisted.</code><code class="descname">TwistedResolver</code><a class="reference internal" href="_modules/tornado/platform/twisted.html#TwistedResolver"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#tornado.platform.twisted.TwistedResolver" title="Permalink to this definition"></a></dt>
<dd><p>Twisted-based asynchronous resolver.</p>
<p>This is a non-blocking and non-threaded resolver.  It is
recommended only when threads cannot be used, since it has
limitations compared to the standard <code class="docutils literal"><span class="pre">getaddrinfo</span></code>-based
<a class="reference internal" href="netutil.html#tornado.netutil.Resolver" title="tornado.netutil.Resolver"><code class="xref py py-obj docutils literal"><span class="pre">Resolver</span></code></a> and
<a class="reference internal" href="netutil.html#tornado.netutil.ThreadedResolver" title="tornado.netutil.ThreadedResolver"><code class="xref py py-obj docutils literal"><span class="pre">ThreadedResolver</span></code></a>.  Specifically, it returns at
most one result, and arguments other than <code class="docutils literal"><span class="pre">host</span></code> and <code class="docutils literal"><span class="pre">family</span></code>
are ignored.  It may fail to resolve when <code class="docutils literal"><span class="pre">family</span></code> is not
<code class="docutils literal"><span class="pre">socket.AF_UNSPEC</span></code>.</p>
<p>Requires Twisted 12.1 or newer.</p>
<div class="versionchanged">
<p><span class="versionmodified">Changed in version 4.1: </span>The <code class="docutils literal"><span class="pre">io_loop</span></code> argument is deprecated.</p>
</div>
</dd></dl>

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