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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/HSEARCH" style="color: #3b73af; text-decoration: none">Hibernate Search</a> / <a href="https://hibernate.atlassian.net/browse/HSEARCH-3386" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-9cfe1afe-c7a9-4108-b325-bd70ad86b4a3" height="16" width="16" border="0" align="absmiddle" alt="Task" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HSEARCH-3386" style="color: #3b73af; text-decoration: none">HSEARCH-3386</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/HSEARCH-3386" style="color: #3b73af; text-decoration: none">Search 6 groundwork - Make bean references easier to use in configuration properties</a> </span> </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"> engine </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"> 03/Oct/2018 00:33 AM </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"> 6.0.0.Alpha-backlog </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"> <a class="user-hover" rel="yrodiere" id="email_yrodiere" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=yrodiere" style="color:#6c797f;; color: #3b73af; text-decoration: none">Yoann Rodière</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">The idea would be to allow to define a configuration property of type "BeanReference", so that we can get rid of some of the complexity we currently face each time a bean can be passed to a configuration property. Ideally, the property should accept these values:</p>
<ul>
<li>a <tt>String</tt> representing the bean name</li>
<li>a <tt>Class<? extends TheExpectedType></tt> (requires <span class="jira-issue-macro" data-jira-key="HSEARCH-3174"> <a href="https://hibernate.atlassian.net/browse/HSEARCH-3174" class="jira-issue-macro-key issue-link" title="Allow non-String values in environment configuration" style="color: #3b73af; text-decoration: none"> <img class="icon" src="https://hibernate.atlassian.net/secure/viewavatar?size=xsmall&avatarId=12150&avatarType=issuetype"> HSEARCH-3174 </a> <span class="aui-lozenge aui-lozenge-subtle aui-lozenge-complete jira-macro-single-issue-export-pdf" style="background: #cccccc; border: 1px solid #cccccc; border-radius: 3px; color: #333333; display: inline-block; font-size: 11px; font-weight: bold; line-height: 99%; margin: 0; padding: 2px 5px; text-align: center; text-decoration: none; text-transform: uppercase; background-color: #ffffff; border-color: #cccccc; color: #333333" bgcolor="#ffffff">Open</span> </span> )</li>
<li>an instance of <tt>TheExpectedType</tt> (requires <span class="jira-issue-macro" data-jira-key="HSEARCH-3174"> <a href="https://hibernate.atlassian.net/browse/HSEARCH-3174" class="jira-issue-macro-key issue-link" title="Allow non-String values in environment configuration" style="color: #3b73af; text-decoration: none"> <img class="icon" src="https://hibernate.atlassian.net/secure/viewavatar?size=xsmall&avatarId=12150&avatarType=issuetype"> HSEARCH-3174 </a> <span class="aui-lozenge aui-lozenge-subtle aui-lozenge-complete jira-macro-single-issue-export-pdf" style="background: #cccccc; border: 1px solid #cccccc; border-radius: 3px; color: #333333; display: inline-block; font-size: 11px; font-weight: bold; line-height: 99%; margin: 0; padding: 2px 5px; text-align: center; text-decoration: none; text-transform: uppercase; background-color: #ffffff; border-color: #cccccc; color: #333333" bgcolor="#ffffff">Open</span> </span> )</li>
</ul> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">One solution would be to allow this:</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">
<span class="code-keyword" style="color: #000091">private</span> <span class="code-keyword" style="color: #000091">static</span> <span class="code-keyword" style="color: #000091">final</span> ConfigurationProperty<Optional<BeanReference>> MY_PROPERTY = ConfigurationProperty.forKey( "myKey )
.asBeanReference()
.build();
...
<span class="code-keyword" style="color: #000091">public</span> void someMethod(BeanProvider beanProvider, ConfigurationPropertySource source) {
MyBean myBean = MY_KEY.get(source).orElseThrow( () -> <span class="code-keyword" style="color: #000091">new</span> IllegalStateException() )
.get( beanProvider, MyBean.class );
}
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">This would require to:</p>
<ul>
<li>Move the reponsibility of passing the beanreference data (name, class, ...) to the beanreference itself: instead of writing <tt>beanProvider.get(beanRef.getName(), beanRef.getType())</tt>, we would write <tt>beanRef.get(beanProvider)</tt> and the beanreference would pass whatever information is necessary. That encapsulation of the bean retrieval would allow to seamlessly introduce bean references that already contain the bean, so that we can more easily support the case where the bean was provided as a property value.</li>
<li>As a consequence, introduce one factory method per "reference type", which could return different implementations: <tt>BeanReference.of(Class<?>)</tt>, <tt>BeanReference.of(String)</tt>, <tt>BeanReference.of(Class<?>, String)</tt>, <tt>BeanReference.ofInstance(Object)</tt></li>
<li>Add a method <tt>PropertyKeyContext.asBeanReference()</tt> to the property key definition DSL, which would define a converter that calls the appropriate <tt>BeanReference.of</tt> method depending on the property value type.</li>
</ul> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">As a second step, we could try to introduce a generic parameter in BeanReference, so that we can write this kind of code:</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">
<div class="codeContent panelContent" style="padding: 9px 12px">
<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">private</span> <span class="code-keyword" style="color: #000091">static</span> <span class="code-keyword" style="color: #000091">final</span> ConfigurationProperty<Optional<BeanReference<MyBean>>> MY_PROPERTY = ConfigurationProperty.forKey( "myKey )
.asBeanReference( MyBean.class )
.build();
...
<span class="code-keyword" style="color: #000091">public</span> void someMethod(BeanProvider beanProvider, ConfigurationPropertySource source) {
MyBean myBean = MY_KEY.get(source).orElseThrow( () -> <span class="code-keyword" style="color: #000091">new</span> IllegalStateException() )
.get( beanProvider );
}
</pre>
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