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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>
created <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-7402'>HHH-7402</a>
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<a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HHH-7402'><strong>Improve performance of named query registry</strong></a>
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<strong style="font-weight:normal;color:#505050;">Issue Type:</strong>
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<img src="https://hibernate.onjira.com/images/icons/bug.gif" height="16" width="16" border="0" align="absmiddle" alt="Bug"> Bug
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<strong style="font-weight:normal;color:#505050;">Assignee:</strong>
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Unassigned </td>
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<strong style="font-weight:normal;color:#505050;">Created:</strong>
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21/Jun/12 8:22 AM
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<strong style="font-weight:normal;color:#505050;">Description:</strong>
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<p style='margin-top:0;margin-bottom:10px;'>Currently named queries (<tt>NamedQueryDefinition</tt>) are kept in <tt>HashMap</tt> registries on the <tt>SessionFactory</tt>. Would make more sense to have kept them in a immutable map for performance reasons. </p>
<p style='margin-top:0;margin-bottom:10px;'>However, the JPA 2.1 spec adds a feature to add (and override) named queries at runtime. So this will not universally be an option. What we would like to do here is two-fold:</p>
<p style='margin-top:0;margin-bottom:10px;'>First is to add a new contract that would allow programatic definition and regsitration of named queries as part of the <tt>SessionFactory</tt> bootstrap process. Initially thinking:</p>
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<pre class="code-java"><span class="code-keyword">interface</span> NamedQueryProvider {
<span class="code-keyword">public</span> processNamedQueries(NamedQueryDefinitionBuilderFactory factory);
}</pre>
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<p style='margin-top:0;margin-bottom:10px;'>Jokes about a "builder factory aside" <img class="emoticon" src="https://hibernate.onjira.com/images/icons/emoticons/wink.gif" height="20" width="20" align="absmiddle" alt="" border="0"/></p>
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<pre class="code-java"><span class="code-keyword">interface</span> NamedQueryDefinitionBuilderFactory {
<span class="code-keyword">public</span> NamedQueryDefinitionBuilder makeNamedQueryDefinitionBuilder();
<span class="code-keyword">public</span> NamedSQLQueryDefinitionBuilder makeNamedSQLQueryDefinitionBuilder();
}</pre>
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<p style='margin-top:0;margin-bottom:10px;'><tt>NamedQueryDefinitionBuilder</tt> and <tt>NamedSQLQueryDefinitionBuilder</tt> are typical builders. <tt>NamedSQLQueryDefinitionBuilder</tt> extends <br/>
<tt>NamedQueryDefinitionBuilder</tt>, in much the same way that <tt>NamedSQLQueryDefinition</tt> extends <tt>NamedQueryDefinition</tt>. </p>
<p style='margin-top:0;margin-bottom:10px;'>The second point is to change how these definitions are stored on <tt>SessionFactory</tt>. As mentioned above, they currently are stored using a <tt>HashMap</tt>. Ideally it would have made more sense to use a immutable map since the contents used to not change after <tt>SessionFactory</tt> creation. However, that mentioned JPA 2.1 feature changes that. The proposal then is to define a new setting to indicate whether the use plans on using the ability to register named query definitions using <tt>EntityManagerFactory</tt>/<tt>SessionFactory</tt>. If not, we can go ahead and make the stores here immutable maps; if so we should probably switch to using <tt>ConcurrentHashMap</tt> anyway. </p>
<p style='margin-top:0;margin-bottom:10px;'>It is important to note that the simultaneous use of the immutable maps and <tt>NamedQueryProvider</tt> is fully supported.</p>
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<strong style="font-weight:normal;color:#505050;">Fix Versions:</strong>
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jpa21 </td>
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<strong style="font-weight:normal;color:#505050;">Project:</strong>
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<a style="color:#6c797f;" href="https://hibernate.onjira.com/browse/HHH">Hibernate ORM</a>
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<strong style="font-weight:normal;color:#505050;">Priority:</strong>
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<img src="https://hibernate.onjira.com/images/icons/priority_major.gif" height="16" width="16" border="0" align="absmiddle" alt="Major"> Major
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<strong style="font-weight:normal;color:#505050;">Reporter:</strong>
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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>
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