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<!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>Utility Registration APIs — zope.component 4.3.0 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> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="next" title="Adapter Registration APIs" href="adapter.html" /> <link rel="prev" title="Site Manager APIs" href="sitemanager.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="utility-registration-apis"> <h1>Utility Registration APIs<a class="headerlink" href="#utility-registration-apis" title="Permalink to this headline">¶</a></h1> <p>Utilities are components that simply provide an interface. They are instantiated at the time or before they are registered. Here we test the simple query interface.</p> <p>Before we register any utility, there is no utility available, of course. The pure instatiation of an object does not make it a utility. If you do not specify a default, you get a <cite>ComponentLookupError</cite>.</p> <p>Otherwise, you get the default:</p> <p>Now we declare <cite>ob</cite> to be the utility providing <cite>I1</cite>:</p> <p>Now the component is available:</p> <div class="section" id="named-utilities"> <h2>Named Utilities<a class="headerlink" href="#named-utilities" title="Permalink to this headline">¶</a></h2> <p>Registering a utility without a name does not mean that it is available when looking for the utility with a name:</p> <p>Registering the utility under the correct name makes it available:</p> </div> <div class="section" id="querying-multiple-utilities"> <h2>Querying Multiple Utilities<a class="headerlink" href="#querying-multiple-utilities" title="Permalink to this headline">¶</a></h2> <p>Sometimes it may be useful to query all utilities, both anonymous and named for a given interface. The <code class="xref py py-func docutils literal notranslate"><span class="pre">getUtilitiesFor()</span></code> API returns a sequence of <code class="docutils literal notranslate"><span class="pre">(name,</span> <span class="pre">utility)</span></code> tuples, where <code class="docutils literal notranslate"><span class="pre">name</span></code> is the empty string for the anonymous utility:</p> <p>The <code class="xref py py-func docutils literal notranslate"><span class="pre">getAllUtilitiesRegisteredFor()</span></code> API returns utilities that have been registered for a particular interface. Utilities providing a derived interface are also listed.</p> <p>Now we register the new utilities:</p> <p>We can now get all the utilities that provide interface <cite>I1</cite>:</p> <p>Note that <cite>getAllUtilitiesRegisteredFor()</cite> does not return the names of the utilities.</p> </div> <div class="section" id="delegated-utility-lookup"> <h2>Delegated Utility Lookup<a class="headerlink" href="#delegated-utility-lookup" title="Permalink to this headline">¶</a></h2> <p>It is common for a utility to delegate its answer to a utility providing the same interface in one of the component registry’s bases. Let’s first create a global utility:</p> <p>Now, let’s create two registries and set up the bases hierarchy:</p> <p>Now we create two utilities and insert them in our folder hierarchy:</p> <p>Now, if we ask <cite>util1_1</cite> for its next available utility we get the <code class="docutils literal notranslate"><span class="pre">one</span></code> utility:</p> <p>Next we ask <cite>util1</cite> for its next utility and we should get the global version:</p> <p>However, if we ask the global utility for the next one, an error is raised</p> <p>You can also use <cite>queryNextUtility</cite> and specify a default:</p> <p>Let’s now ensure that the function also works with multiple registries. First we create another base registry:</p> <p>We now set up another utility into that registry:</p> <p>We add it as a base to the local site manager:</p> <p>Both the <code class="docutils literal notranslate"><span class="pre">myregistry</span></code> and global utilities should be available:</p> <p>Note, if the context cannot be converted to a site manager, the default is retruned:</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"><a class="reference internal" href="../hooks.html">The current component registry</a></li> <li class="toctree-l1"><a class="reference internal" href="../testlayer.html">Layers</a></li> <li class="toctree-l1 current"><a class="reference internal" href="../api.html"><code class="docutils literal notranslate"><span class="pre">zope.component</span></code> API Reference</a><ul class="current"> <li class="toctree-l2"><a class="reference internal" href="interfaces.html">Interface Definitions</a></li> <li class="toctree-l2"><a class="reference internal" href="sitemanager.html">Site Manager APIs</a></li> <li class="toctree-l2 current"><a class="current reference internal" href="#">Utility Registration APIs</a></li> <li class="toctree-l2"><a class="reference internal" href="adapter.html">Adapter Registration APIs</a></li> <li class="toctree-l2"><a class="reference internal" href="factory.html">Factory APIs</a></li> <li class="toctree-l2"><a class="reference internal" href="interface.html">Interface Registration APIs</a></li> <li class="toctree-l2"><a class="reference internal" href="security.html">Security APIs</a></li> <li class="toctree-l2"><a class="reference internal" href="persistent.html">Persistent Registries</a></li> </ul> </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><a href="../api.html"><code class="docutils literal notranslate"><span class="pre">zope.component</span></code> API Reference</a><ul> <li>Previous: <a href="sitemanager.html" title="previous chapter">Site Manager APIs</a></li> <li>Next: <a href="adapter.html" title="next chapter">Adapter Registration APIs</a></li> </ul></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 1.7.6</a> & <a href="https://github.com/bitprophet/alabaster">Alabaster 0.7.9</a> | <a href="../_sources/api/utility.rst.txt" rel="nofollow">Page source</a> </div> </body> </html>
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