<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="X-UA-Compatible" content="IE=Edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>The current component registry — zope.component 4.4.1 documentation</title>
<link rel="stylesheet" href="_static/alabaster.css" type="text/css" />
<link rel="stylesheet" href="_static/pygments.css" type="text/css" />
<script type="text/javascript" id="documentation_options" data-url_root="./" src="_static/documentation_options.js"></script>
<script type="text/javascript" src="_static/jquery.js"></script>
<script type="text/javascript" src="_static/underscore.js"></script>
<script type="text/javascript" src="_static/doctools.js"></script>
<script type="text/javascript" src="_static/language_data.js"></script>
<link rel="index" title="Index" href="genindex.html" />
<link rel="search" title="Search" href="search.html" />
<link rel="next" title="Layers" href="testlayer.html" />
<link rel="prev" title="Package configuration" href="configure.html" />
<link rel="stylesheet" href="_static/custom.css" type="text/css" />
<meta name="viewport" content="width=device-width, initial-scale=0.9, maximum-scale=0.9" />
</head><body>
<div class="document">
<div class="documentwrapper">
<div class="bodywrapper">
<div class="body" role="main">
<div class="section" id="the-current-component-registry">
<h1>The current component registry<a class="headerlink" href="#the-current-component-registry" title="Permalink to this headline">¶</a></h1>
<p>There can be any number of component registries in an application. One of them
is the global component registry, and there is also the concept of a currently
used component registry. Component registries other than the global one are
associated with objects called sites. The <code class="docutils literal notranslate"><span class="pre">zope.component.hooks</span></code> module
provides an API to set and access the current site as well as manipulate the
adapter hook associated with it.</p>
<p>As long as we haven’t set a site, none is being considered current:</p>
<p>We can also ask for the current component registry (aka site manager
historically); it will return the global one if no current site is set:</p>
<p>Let’s set a site now. A site has to be an object that provides the
<code class="docutils literal notranslate"><span class="pre">getSiteManager</span></code> method, which is specified by
<code class="docutils literal notranslate"><span class="pre">zope.component.interfaces.IPossibleSite</span></code>:</p>
<p>After this, the newly set site is considered the currently active one:</p>
<p>If we set another site, that one will be considered current:</p>
<p>Finally we can unset the site and the global component registry is used again:</p>
<div class="section" id="context-manager">
<h2>Context manager<a class="headerlink" href="#context-manager" title="Permalink to this headline">¶</a></h2>
<p>There also is a context manager for setting the site, which is especially
useful when writing tests:</p>
<p>The site is properly restored even if the body of the with statement
raises an exception:</p>
</div>
</div>
</div>
</div>
</div>
<div class="sphinxsidebar" role="navigation" aria-label="main navigation">
<div class="sphinxsidebarwrapper">
<h1 class="logo"><a href="index.html">zope.component</a></h1>
<h3>Navigation</h3>
<ul class="current">
<li class="toctree-l1"><a class="reference internal" href="narr.html">Zope Component Architecture</a></li>
<li class="toctree-l1"><a class="reference internal" href="socketexample.html">The Zope 3 Component Architecture (Socket Example)</a></li>
<li class="toctree-l1"><a class="reference internal" href="event.html">Events</a></li>
<li class="toctree-l1"><a class="reference internal" href="factory.html">Factories</a></li>
<li class="toctree-l1"><a class="reference internal" href="persistentregistry.html">Persistent Component Management</a></li>
<li class="toctree-l1"><a class="reference internal" href="zcml.html">ZCML directives</a></li>
<li class="toctree-l1"><a class="reference internal" href="configure.html">Package configuration</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">The current component registry</a><ul>
<li class="toctree-l2"><a class="reference internal" href="#context-manager">Context manager</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="testlayer.html">Layers</a></li>
<li class="toctree-l1"><a class="reference internal" href="api.html"><code class="docutils literal notranslate"><span class="pre">zope.component</span></code> API Reference</a></li>
<li class="toctree-l1"><a class="reference internal" href="hacking.html">Hacking on <code class="docutils literal notranslate"><span class="pre">zope.component</span></code></a></li>
</ul>
<div class="relations">
<h3>Related Topics</h3>
<ul>
<li><a href="index.html">Documentation overview</a><ul>
<li>Previous: <a href="configure.html" title="previous chapter">Package configuration</a></li>
<li>Next: <a href="testlayer.html" title="next chapter">Layers</a></li>
</ul></li>
</ul>
</div>
<div id="searchbox" style="display: none" role="search">
<h3>Quick search</h3>
<div class="searchformwrapper">
<form class="search" action="search.html" method="get">
<input type="text" name="q" />
<input type="submit" value="Go" />
<input type="hidden" name="check_keywords" value="yes" />
<input type="hidden" name="area" value="default" />
</form>
</div>
</div>
<script type="text/javascript">$('#searchbox').show(0);</script>
</div>
</div>
<div class="clearer"></div>
</div>
<div class="footer">
©Zope Foundation and Contributors.
|
Powered by <a href="http://sphinx-doc.org/">Sphinx 1.8.3</a>
& <a href="https://github.com/bitprophet/alabaster">Alabaster 0.7.8</a>
|
<a href="_sources/hooks.rst.txt"
rel="nofollow">Page source</a>
</div>
</body>
</html>
distrib
>
Mageia
>
7
>
armv7hl
>
media
>
core-release
>
by-pkgid
>
16b6c7fca2fc9f56193b382cc05af140
>
files
>
203
