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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-12490" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-ab6c3c98-bd5a-4243-90d1-bf8d0b84a1e7" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-12490" style="color: #3b73af; text-decoration: none">HHH-12490</a> </td>
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<td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-12490" style="color: #3b73af; text-decoration: none">Add caching to MetamodelImpl</a> </span> </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-ab6c3c98-bd5a-4243-90d1-bf8d0b84a1e7" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"> Improvement </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.2.5 </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Unassigned </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Components:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> metamodel </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 16/Apr/2018 12:44 PM </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-minor-2261829b-30c8-426d-bfb4-d465bd9b0373" height="16" width="16" border="0" align="absmiddle" alt="Minor" style="vertical-align: text-bottom"> Minor </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Reporter:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="marc.boudreault" id="email_marc.boudreault" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=marc.boudreault" style="color:#6c797f;; color: #3b73af; text-decoration: none">Marc Boudreault</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">Hello,</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">This is a proposal for a simple improvement that made an appreciable difference in CPU utilization while testing our app:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
--- C:\project\MetamodelImpl.java 2018-04-16 15:00:38.193608600 -0400
+++ C:\project\src\main\java\org\hibernate\metamodel\internal\MetamodelImpl.java 2018-04-16 15:21:41.331046300 -0400
@@ -87,6 +87,7 @@
<span class="code-keyword" style="color: #000091">private</span> <span class="code-keyword" style="color: #000091">final</span> Map<<span class="code-object" style="color: #910091">String</span>, EntityTypeImpl<?>> jpaEntityTypesByEntityName = <span class="code-keyword" style="color: #000091">new</span> ConcurrentHashMap<>();
<span class="code-keyword" style="color: #000091">private</span> <span class="code-keyword" style="color: #000091">final</span> <span class="code-keyword" style="color: #000091">transient</span> Map<<span class="code-object" style="color: #910091">String</span>,EntityGraph> entityGraphMap = <span class="code-keyword" style="color: #000091">new</span> ConcurrentHashMap<>();
+ <span class="code-keyword" style="color: #000091">private</span> <span class="code-keyword" style="color: #000091">final</span> Map<<span class="code-object" style="color: #910091">String</span>,<span class="code-object" style="color: #910091">String</span>[]> implementorsMap = <span class="code-keyword" style="color: #000091">new</span> ConcurrentHashMap<>();
<span class="code-keyword" style="color: #000091">public</span> MetamodelImpl(SessionFactoryImplementor sessionFactory) {
<span class="code-keyword" style="color: #000091">this</span>.sessionFactory = sessionFactory;
@@ -542,7 +543,9 @@
* @<span class="code-keyword" style="color: #000091">throws</span> MappingException
*/
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">String</span>[] getImplementors(<span class="code-object" style="color: #910091">String</span> className) <span class="code-keyword" style="color: #000091">throws</span> MappingException {
-
+ <span class="code-keyword" style="color: #000091">if</span>(implementorsMap.containsKey(className)){
+ <span class="code-keyword" style="color: #000091">return</span> implementorsMap.get(className);
+ }
<span class="code-keyword" style="color: #000091">final</span> <span class="code-object" style="color: #910091">Class</span> clazz;
<span class="code-keyword" style="color: #000091">try</span> {
clazz = getSessionFactory().getServiceRegistry().getService( ClassLoaderService.class ).classForName( className );
@@ -586,7 +589,10 @@
}
}
}
- <span class="code-keyword" style="color: #000091">return</span> results.toArray( <span class="code-keyword" style="color: #000091">new</span> <span class="code-object" style="color: #910091">String</span>[results.size()] );
+
+ <span class="code-object" style="color: #910091">String</span>[] ret = results.toArray( <span class="code-keyword" style="color: #000091">new</span> <span class="code-object" style="color: #910091">String</span>[results.size()] );
+ implementorsMap.put(className, ret);
+ <span class="code-keyword" style="color: #000091">return</span> ret;
}
@Override
\ No newline at end of file
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Basically, the code above add caching to getImplementors. </p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">With this change we could obtain about 4 to 5% improvement in CPU utilization across the application.</p> </td>
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