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/> <link rel="next" title="Hacking on zope.component" href="../hacking.html" /> <link rel="prev" title="Security APIs" href="security.html" /> </head> <body> <div class="related"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../hacking.html" title="Hacking on zope.component" accesskey="N">next</a> |</li> <li class="right" > <a href="security.html" title="Security APIs" accesskey="P">previous</a> |</li> <li><a href="../index.html">zope.configuration 4.0 documentation</a> »</li> <li><a href="../api.html" accesskey="U"><tt class="docutils literal"><span class="pre">zope.component</span></tt> API Reference</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="persistent-registries"> <h1>Persistent Registries<a class="headerlink" href="#persistent-registries" title="Permalink to this headline">¶</a></h1> <div class="section" id="conforming-adapter-lookup"> <h2>Conforming Adapter Lookup<a class="headerlink" href="#conforming-adapter-lookup" title="Permalink to this headline">¶</a></h2> <p>Here, we’ll demonstrate that changes work even when data are stored in a database and when accessed from multiple connections.</p> <p>Start by setting up a database and creating two transaction managers and database connections to work with.</p> <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">ZODB.tests.util</span> <span class="gp">>>> </span><span class="n">db</span> <span class="o">=</span> <span class="n">ZODB</span><span class="o">.</span><span class="n">tests</span><span class="o">.</span><span class="n">util</span><span class="o">.</span><span class="n">DB</span><span class="p">()</span> <span class="gp">>>> </span><span class="kn">import</span> <span class="nn">transaction</span> <span class="gp">>>> </span><span class="n">t1</span> <span class="o">=</span> <span class="n">transaction</span><span class="o">.</span><span class="n">TransactionManager</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">c1</span> <span class="o">=</span> <span class="n">db</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="n">transaction_manager</span><span class="o">=</span><span class="n">t1</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">r1</span> <span class="o">=</span> <span class="n">c1</span><span class="o">.</span><span class="n">root</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">t2</span> <span class="o">=</span> <span class="n">transaction</span><span class="o">.</span><span class="n">TransactionManager</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">c2</span> <span class="o">=</span> <span class="n">db</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="n">transaction_manager</span><span class="o">=</span><span class="n">t2</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">r2</span> <span class="o">=</span> <span class="n">c2</span><span class="o">.</span><span class="n">root</span><span class="p">()</span> </pre></div> </div> <p>Create a set of components registries in the database, alternating connections.</p> <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">from</span> <span class="nn">zope.component.persistentregistry</span> <span class="kn">import</span> <span class="n">PersistentComponents</span> <span class="gp">>>> </span><span class="kn">from</span> <span class="nn">zope.component.tests.examples</span> <span class="kn">import</span> <span class="n">I1</span> <span class="gp">>>> </span><span class="kn">from</span> <span class="nn">zope.component.tests.examples</span> <span class="kn">import</span> <span class="n">I2</span> <span class="gp">>>> </span><span class="kn">from</span> <span class="nn">zope.component.tests.examples</span> <span class="kn">import</span> <span class="n">U</span> <span class="gp">>>> </span><span class="kn">from</span> <span class="nn">zope.component.tests.examples</span> <span class="kn">import</span> <span class="n">U1</span> <span class="gp">>>> </span><span class="kn">from</span> <span class="nn">zope.component.tests.examples</span> <span class="kn">import</span> <span class="n">U12</span> <span class="gp">>>> </span><span class="kn">from</span> <span class="nn">zope.component.tests.examples</span> <span class="kn">import</span> <span class="n">handle1</span> <span class="gp">>>> </span><span class="kn">from</span> <span class="nn">zope.component.tests.examples</span> <span class="kn">import</span> <span class="n">handle2</span> <span class="gp">>>> </span><span class="kn">from</span> <span class="nn">zope.component.tests.examples</span> <span class="kn">import</span> <span class="n">handle3</span> <span class="gp">>>> </span><span class="kn">from</span> <span class="nn">zope.component.tests.examples</span> <span class="kn">import</span> <span class="n">handle4</span> <span class="gp">>>> </span><span class="n">_</span> <span class="o">=</span> <span class="n">t1</span><span class="o">.</span><span class="n">begin</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">r1</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="o">=</span> <span class="n">PersistentComponents</span><span class="p">(</span><span class="s">'1'</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">t1</span><span class="o">.</span><span class="n">commit</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">_</span> <span class="o">=</span> <span class="n">t2</span><span class="o">.</span><span class="n">begin</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">r2</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span> <span class="o">=</span> <span class="n">PersistentComponents</span><span class="p">(</span><span class="s">'2'</span><span class="p">,</span> <span class="p">(</span><span class="n">r2</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="p">))</span> <span class="gp">>>> </span><span class="n">t2</span><span class="o">.</span><span class="n">commit</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">_</span> <span class="o">=</span> <span class="n">t1</span><span class="o">.</span><span class="n">begin</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">r1</span><span class="p">[</span><span class="mi">3</span><span class="p">]</span> <span class="o">=</span> <span class="n">PersistentComponents</span><span class="p">(</span><span class="s">'3'</span><span class="p">,</span> <span class="p">(</span><span class="n">r1</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="p">))</span> <span class="gp">>>> </span><span class="n">t1</span><span class="o">.</span><span class="n">commit</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">_</span> <span class="o">=</span> <span class="n">t2</span><span class="o">.</span><span class="n">begin</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">r2</span><span class="p">[</span><span class="mi">4</span><span class="p">]</span> <span class="o">=</span> <span class="n">PersistentComponents</span><span class="p">(</span><span class="s">'4'</span><span class="p">,</span> <span class="p">(</span><span class="n">r2</span><span class="p">[</span><span class="mi">2</span><span class="p">],</span> <span class="n">r2</span><span class="p">[</span><span class="mi">3</span><span class="p">]))</span> <span class="gp">>>> </span><span class="n">t2</span><span class="o">.</span><span class="n">commit</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">_</span> <span class="o">=</span> <span class="n">t1</span><span class="o">.</span><span class="n">begin</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">r1</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">__bases__</span> <span class="go">()</span> <span class="gp">>>> </span><span class="n">r1</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span><span class="o">.</span><span class="n">__bases__</span> <span class="o">==</span> <span class="p">(</span><span class="n">r1</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="p">)</span> <span class="go">True</span> <span class="gp">>>> </span><span class="n">r1</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">registerUtility</span><span class="p">(</span><span class="n">U1</span><span class="p">(</span><span class="mi">1</span><span class="p">))</span> <span class="gp">>>> </span><span class="n">r1</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">queryUtility</span><span class="p">(</span><span class="n">I1</span><span class="p">)</span> <span class="go">U1(1)</span> <span class="gp">>>> </span><span class="n">r1</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span><span class="o">.</span><span class="n">queryUtility</span><span class="p">(</span><span class="n">I1</span><span class="p">)</span> <span class="go">U1(1)</span> <span class="gp">>>> </span><span class="n">t1</span><span class="o">.</span><span class="n">commit</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">_</span> <span class="o">=</span> <span class="n">t2</span><span class="o">.</span><span class="n">begin</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">r2</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">registerUtility</span><span class="p">(</span><span class="n">U1</span><span class="p">(</span><span class="mi">2</span><span class="p">))</span> <span class="gp">>>> </span><span class="n">r2</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span><span class="o">.</span><span class="n">queryUtility</span><span class="p">(</span><span class="n">I1</span><span class="p">)</span> <span class="go">U1(2)</span> <span class="gp">>>> </span><span class="n">r2</span><span class="p">[</span><span class="mi">4</span><span class="p">]</span><span class="o">.</span><span class="n">queryUtility</span><span class="p">(</span><span class="n">I1</span><span class="p">)</span> <span class="go">U1(2)</span> <span class="gp">>>> </span><span class="n">t2</span><span class="o">.</span><span class="n">commit</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">_</span> <span class="o">=</span> <span class="n">t1</span><span class="o">.</span><span class="n">begin</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">r1</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">registerUtility</span><span class="p">(</span><span class="n">U12</span><span class="p">(</span><span class="mi">1</span><span class="p">),</span> <span class="n">I2</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">r1</span><span class="p">[</span><span class="mi">4</span><span class="p">]</span><span class="o">.</span><span class="n">queryUtility</span><span class="p">(</span><span class="n">I2</span><span class="p">)</span> <span class="go">U12(1)</span> <span class="gp">>>> </span><span class="n">t1</span><span class="o">.</span><span class="n">commit</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">_</span> <span class="o">=</span> <span class="n">t2</span><span class="o">.</span><span class="n">begin</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">r2</span><span class="p">[</span><span class="mi">3</span><span class="p">]</span><span class="o">.</span><span class="n">registerUtility</span><span class="p">(</span><span class="n">U12</span><span class="p">(</span><span class="mi">3</span><span class="p">),</span> <span class="n">I2</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">r2</span><span class="p">[</span><span class="mi">4</span><span class="p">]</span><span class="o">.</span><span class="n">queryUtility</span><span class="p">(</span><span class="n">I2</span><span class="p">)</span> <span class="go">U12(3)</span> <span class="gp">>>> </span><span class="n">t2</span><span class="o">.</span><span class="n">commit</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">_</span> <span class="o">=</span> <span class="n">t1</span><span class="o">.</span><span class="n">begin</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">r1</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">registerHandler</span><span class="p">(</span><span class="n">handle1</span><span class="p">,</span> <span class="n">info</span><span class="o">=</span><span class="s">"First handler"</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">r1</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span><span class="o">.</span><span class="n">registerHandler</span><span class="p">(</span><span class="n">handle2</span><span class="p">,</span> <span class="n">required</span><span class="o">=</span><span class="p">[</span><span class="n">U</span><span class="p">])</span> <span class="gp">>>> </span><span class="n">r1</span><span class="p">[</span><span class="mi">3</span><span class="p">]</span><span class="o">.</span><span class="n">registerHandler</span><span class="p">(</span><span class="n">handle3</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">r1</span><span class="p">[</span><span class="mi">4</span><span class="p">]</span><span class="o">.</span><span class="n">registerHandler</span><span class="p">(</span><span class="n">handle4</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">r1</span><span class="p">[</span><span class="mi">4</span><span class="p">]</span><span class="o">.</span><span class="n">handle</span><span class="p">(</span><span class="n">U1</span><span class="p">(</span><span class="mi">1</span><span class="p">))</span> <span class="go">handle1 U1(1)</span> <span class="go">handle3 U1(1)</span> <span class="go">handle2 (U1(1),)</span> <span class="go">handle4 U1(1)</span> <span class="gp">>>> </span><span class="n">t1</span><span class="o">.</span><span class="n">commit</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">_</span> <span class="o">=</span> <span class="n">t2</span><span class="o">.</span><span class="n">begin</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">r2</span><span class="p">[</span><span class="mi">4</span><span class="p">]</span><span class="o">.</span><span class="n">handle</span><span class="p">(</span><span class="n">U1</span><span class="p">(</span><span class="mi">1</span><span class="p">))</span> <span class="go">handle1 U1(1)</span> <span class="go">handle3 U1(1)</span> <span class="go">handle2 (U1(1),)</span> <span class="go">handle4 U1(1)</span> <span class="gp">>>> </span><span class="n">t2</span><span class="o">.</span><span class="n">abort</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">db</span><span class="o">.</span><span class="n">close</span><span class="p">()</span> </pre></div> </div> </div> <div class="section" id="subscription-to-events-in-persistent-registries"> <h2>Subscription to Events in Persistent Registries<a class="headerlink" href="#subscription-to-events-in-persistent-registries" title="Permalink to this headline">¶</a></h2> <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">ZODB.tests.util</span> <span class="gp">>>> </span><span class="n">db</span> <span class="o">=</span> <span class="n">ZODB</span><span class="o">.</span><span class="n">tests</span><span class="o">.</span><span class="n">util</span><span class="o">.</span><span class="n">DB</span><span class="p">()</span> <span class="gp">>>> </span><span class="kn">import</span> <span class="nn">transaction</span> <span class="gp">>>> </span><span class="n">t1</span> <span class="o">=</span> <span class="n">transaction</span><span class="o">.</span><span class="n">TransactionManager</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">c1</span> <span class="o">=</span> <span class="n">db</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="n">transaction_manager</span><span class="o">=</span><span class="n">t1</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">r1</span> <span class="o">=</span> <span class="n">c1</span><span class="o">.</span><span class="n">root</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">t2</span> <span class="o">=</span> <span class="n">transaction</span><span class="o">.</span><span class="n">TransactionManager</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">c2</span> <span class="o">=</span> <span class="n">db</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="n">transaction_manager</span><span class="o">=</span><span class="n">t2</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">r2</span> <span class="o">=</span> <span class="n">c2</span><span class="o">.</span><span class="n">root</span><span class="p">()</span> <span class="gp">>>> </span><span class="kn">from</span> <span class="nn">zope.component.persistentregistry</span> <span class="kn">import</span> <span class="n">PersistentComponents</span> <span class="gp">>>> </span><span class="n">_</span> <span class="o">=</span> <span class="n">t1</span><span class="o">.</span><span class="n">begin</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">r1</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="o">=</span> <span class="n">PersistentComponents</span><span class="p">(</span><span class="s">'1'</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">r1</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">registerHandler</span><span class="p">(</span><span class="n">handle1</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">r1</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">registerSubscriptionAdapter</span><span class="p">(</span><span class="n">handle1</span><span class="p">,</span> <span class="n">provided</span><span class="o">=</span><span class="n">I2</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">_</span> <span class="o">=</span> <span class="n">r1</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">unregisterHandler</span><span class="p">(</span><span class="n">handle1</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">_</span> <span class="o">=</span> <span class="n">r1</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">unregisterSubscriptionAdapter</span><span class="p">(</span><span class="n">handle1</span><span class="p">,</span> <span class="n">provided</span><span class="o">=</span><span class="n">I2</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">t1</span><span class="o">.</span><span class="n">commit</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">_</span> <span class="o">=</span> <span class="n">t1</span><span class="o">.</span><span class="n">begin</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">r1</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">registerHandler</span><span class="p">(</span><span class="n">handle1</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">r1</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">registerSubscriptionAdapter</span><span class="p">(</span><span class="n">handle1</span><span class="p">,</span> <span class="n">provided</span><span class="o">=</span><span class="n">I2</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">t1</span><span class="o">.</span><span class="n">commit</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">_</span> <span class="o">=</span> <span class="n">t2</span><span class="o">.</span><span class="n">begin</span><span class="p">()</span> <span class="gp">>>> </span><span class="nb">len</span><span class="p">(</span><span class="nb">list</span><span class="p">(</span><span class="n">r2</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">registeredHandlers</span><span class="p">()))</span> <span class="go">1</span> <span class="gp">>>> </span><span class="nb">len</span><span class="p">(</span><span class="nb">list</span><span class="p">(</span><span class="n">r2</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">.</span><span class="n">registeredSubscriptionAdapters</span><span class="p">()))</span> <span class="go">1</span> <span class="gp">>>> </span><span class="n">t2</span><span class="o">.</span><span class="n">abort</span><span class="p">()</span> </pre></div> </div> </div> <div class="section" id="adapter-registrations-after-serialization-deserialization"> <h2>Adapter Registrations after Serialization / Deserialization<a class="headerlink" href="#adapter-registrations-after-serialization-deserialization" title="Permalink to this headline">¶</a></h2> <p>We want to make sure that we see updates corrextly.</p> <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">persistent</span> <span class="gp">>>> </span><span class="kn">import</span> <span class="nn">transaction</span> <span class="gp">>>> </span><span class="kn">from</span> <span class="nn">zope.interface</span> <span class="kn">import</span> <span class="n">Interface</span> <span class="gp">>>> </span><span class="kn">from</span> <span class="nn">zope.interface</span> <span class="kn">import</span> <span class="n">implements</span> <span class="gp">>>> </span><span class="k">class</span> <span class="nc">IFoo</span><span class="p">(</span><span class="n">Interface</span><span class="p">):</span> <span class="gp">... </span> <span class="k">pass</span> <span class="gp">>>> </span><span class="k">class</span> <span class="nc">Foo</span><span class="p">(</span><span class="n">persistent</span><span class="o">.</span><span class="n">Persistent</span><span class="p">):</span> <span class="gp">... </span> <span class="n">implements</span><span class="p">(</span><span class="n">IFoo</span><span class="p">)</span> <span class="gp">... </span> <span class="n">name</span> <span class="o">=</span> <span class="s">''</span> <span class="gp">... </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">name</span><span class="o">=</span><span class="s">''</span><span class="p">):</span> <span class="gp">... </span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span> <span class="o">=</span> <span class="n">name</span> <span class="gp">... </span> <span class="k">def</span> <span class="nf">__repr__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="gp">... </span> <span class="k">return</span> <span class="s">'Foo(</span><span class="si">%r</span><span class="s">)'</span> <span class="o">%</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span> <span class="gp">>>> </span><span class="kn">from</span> <span class="nn">zope.component.tests.examples</span> <span class="kn">import</span> <span class="n">base</span> <span class="gp">>>> </span><span class="kn">from</span> <span class="nn">zope.component.tests.examples</span> <span class="kn">import</span> <span class="n">clear_base</span> <span class="gp">>>> </span><span class="nb">len</span><span class="p">(</span><span class="n">base</span><span class="o">.</span><span class="n">_v_subregistries</span><span class="p">)</span> <span class="go">0</span> <span class="gp">>>> </span><span class="kn">import</span> <span class="nn">ZODB.tests.util</span> <span class="gp">>>> </span><span class="n">db</span> <span class="o">=</span> <span class="n">ZODB</span><span class="o">.</span><span class="n">tests</span><span class="o">.</span><span class="n">util</span><span class="o">.</span><span class="n">DB</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">tm1</span> <span class="o">=</span> <span class="n">transaction</span><span class="o">.</span><span class="n">TransactionManager</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">c1</span> <span class="o">=</span> <span class="n">db</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="n">transaction_manager</span><span class="o">=</span><span class="n">tm1</span><span class="p">)</span> <span class="gp">>>> </span><span class="kn">from</span> <span class="nn">zope.component.persistentregistry</span> <span class="kn">import</span> <span class="n">PersistentAdapterRegistry</span> <span class="gp">>>> </span><span class="n">r1</span> <span class="o">=</span> <span class="n">PersistentAdapterRegistry</span><span class="p">((</span><span class="n">base</span><span class="p">,))</span> <span class="gp">>>> </span><span class="n">r2</span> <span class="o">=</span> <span class="n">PersistentAdapterRegistry</span><span class="p">((</span><span class="n">r1</span><span class="p">,))</span> <span class="gp">>>> </span><span class="n">c1</span><span class="o">.</span><span class="n">root</span><span class="p">()[</span><span class="mi">1</span><span class="p">]</span> <span class="o">=</span> <span class="n">r1</span> <span class="gp">>>> </span><span class="n">c1</span><span class="o">.</span><span class="n">root</span><span class="p">()[</span><span class="mi">2</span><span class="p">]</span> <span class="o">=</span> <span class="n">r2</span> <span class="gp">>>> </span><span class="n">tm1</span><span class="o">.</span><span class="n">commit</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">r1</span><span class="o">.</span><span class="n">_p_deactivate</span><span class="p">()</span> <span class="gp">>>> </span><span class="nb">len</span><span class="p">(</span><span class="n">base</span><span class="o">.</span><span class="n">_v_subregistries</span><span class="p">)</span> <span class="go">0</span> <span class="gp">>>> </span><span class="n">tm2</span> <span class="o">=</span> <span class="n">transaction</span><span class="o">.</span><span class="n">TransactionManager</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">c2</span> <span class="o">=</span> <span class="n">db</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="n">transaction_manager</span><span class="o">=</span><span class="n">tm2</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">r1</span> <span class="o">=</span> <span class="n">c2</span><span class="o">.</span><span class="n">root</span><span class="p">()[</span><span class="mi">1</span><span class="p">]</span> <span class="gp">>>> </span><span class="n">r2</span> <span class="o">=</span> <span class="n">c2</span><span class="o">.</span><span class="n">root</span><span class="p">()[</span><span class="mi">2</span><span class="p">]</span> <span class="gp">>>> </span><span class="n">r1</span><span class="o">.</span><span class="n">lookup</span><span class="p">((),</span> <span class="n">IFoo</span><span class="p">,</span> <span class="s">''</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">base</span><span class="o">.</span><span class="n">register</span><span class="p">((),</span> <span class="n">IFoo</span><span class="p">,</span> <span class="s">''</span><span class="p">,</span> <span class="n">Foo</span><span class="p">(</span><span class="s">''</span><span class="p">))</span> <span class="gp">>>> </span><span class="n">r1</span><span class="o">.</span><span class="n">lookup</span><span class="p">((),</span> <span class="n">IFoo</span><span class="p">,</span> <span class="s">''</span><span class="p">)</span> <span class="go">Foo('')</span> <span class="gp">>>> </span><span class="n">r2</span><span class="o">.</span><span class="n">lookup</span><span class="p">((),</span> <span class="n">IFoo</span><span class="p">,</span> <span class="s">'1'</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">r1</span><span class="o">.</span><span class="n">register</span><span class="p">((),</span> <span class="n">IFoo</span><span class="p">,</span> <span class="s">'1'</span><span class="p">,</span> <span class="n">Foo</span><span class="p">(</span><span class="s">'1'</span><span class="p">))</span> <span class="gp">>>> </span><span class="n">r2</span><span class="o">.</span><span class="n">lookup</span><span class="p">((),</span> <span class="n">IFoo</span><span class="p">,</span> <span class="s">'1'</span><span class="p">)</span> <span class="go">Foo('1')</span> <span class="gp">>>> </span><span class="n">r1</span><span class="o">.</span><span class="n">lookup</span><span class="p">((),</span> <span class="n">IFoo</span><span class="p">,</span> <span class="s">'2'</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">r2</span><span class="o">.</span><span class="n">lookup</span><span class="p">((),</span> <span class="n">IFoo</span><span class="p">,</span> <span class="s">'2'</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">base</span><span class="o">.</span><span class="n">register</span><span class="p">((),</span> <span class="n">IFoo</span><span class="p">,</span> <span class="s">'2'</span><span class="p">,</span> <span class="n">Foo</span><span class="p">(</span><span class="s">'2'</span><span class="p">))</span> <span class="gp">>>> </span><span class="n">r1</span><span class="o">.</span><span class="n">lookup</span><span class="p">((),</span> <span class="n">IFoo</span><span class="p">,</span> <span class="s">'2'</span><span class="p">)</span> <span class="go">Foo('2')</span> <span class="gp">>>> </span><span class="n">r2</span><span class="o">.</span><span class="n">lookup</span><span class="p">((),</span> <span class="n">IFoo</span><span class="p">,</span> <span class="s">'2'</span><span class="p">)</span> <span class="go">Foo('2')</span> <span class="gp">>>> </span><span class="n">db</span><span class="o">.</span><span class="n">close</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">clear_base</span><span class="p">()</span> </pre></div> </div> </div> </div> </div> </div> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h3><a href="../index.html">Table Of Contents</a></h3> <ul> <li><a class="reference internal" href="#">Persistent Registries</a><ul> <li><a class="reference internal" href="#conforming-adapter-lookup">Conforming Adapter Lookup</a></li> <li><a class="reference internal" href="#subscription-to-events-in-persistent-registries">Subscription to Events in Persistent Registries</a></li> <li><a class="reference internal" href="#adapter-registrations-after-serialization-deserialization">Adapter Registrations 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