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<a class="user-hover" rel="steve" id="email_steve" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=steve" style="color:#6c797f;">Steve Ebersole</a>
edited a comment on <img src="https://hibernate.onjira.com/images/icons/bug.gif" height="16" width="16" border="0" align="absmiddle" alt="Bug"> <a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HHH-7580'>HHH-7580</a>
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<a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HHH-7580'><strong>Complete 2-phase SessionFactory building design</strong></a>
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<div class="comment-block" style="background-color:#edf5ff;border:1px solid #dddddd;color:#000000;padding:12px;"><p>Design:</p>
<ol>
<li>phase 1 : the design goal here is to limit class-loading and access to environmental resources which might not yet be available (datasources, jndi,etc)
<ol>
<li>build <tt>BootstrapServiceRegistry</tt> - this step is sort of optional and only really needed if user wants to:
<ul>
<li>override how class-loading works</li>
<li>supply explicit "provided" <tt>Integrator</tt> instances</li>
<li>override how "strategy selection" works (although can also be done via Java ServiceLoader resolution).</li>
</ul>
</li>
<li>build <tt>MetadataSources</tt> - this collects the sources of mapping information (HBM files, annotated classes, etc).</li>
</ol>
</li>
<li>phase 2 : at this stage we assume the limits imposed on phase 1 are no longer applicable
<ol>
<li>build <tt>StandardServiceRegistry</tt></li>
<li>build <tt>Metadata</tt></li>
<li>use <tt>StandardServiceRegistry</tt> and <tt>Metadata</tt> to build <tt>SessionFactory</tt></li>
</ol>
</li>
</ol>
<p>The problem with this is that, from a user PoV, this sure seems like a lot of steps (is that just me?):</p>
<div class="code panel" style="border-style: solid;border-width: 1px;"><div class="codeContent panelContent">
<pre class="code-java"><span class="code-comment">// phase 1
</span>BootstrapServiceRegistry bootRegistry = <span class="code-keyword">new</span> BootstrapServiceRegistryBuilder()...build();
MetadataSources metadataSources = <span class="code-keyword">new</span> MetadataSources( bootRegistry )...;
<span class="code-comment">// phase 2
</span>StandardServiceRegistry standardRegistry = <span class="code-keyword">new</span> StandardServiceRegistryBuilder( bootRegistry )...build();
Metadata metadata = metadataSources.getMetadataBuilder()...buildMetadata( standardRegistry );
SessionFactory sessionFactory = metadata.getSessionFactoryBuilder()...build();</pre>
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