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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-3249" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-b03b29a3-f549-4957-aa4f-a6f188861b33" height="16" width="16" border="0" align="absmiddle" alt="Task" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HSEARCH-3249" style="color: #3b73af; text-decoration: none">HSEARCH-3249</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-3249" style="color: #3b73af; text-decoration: none">Allow to use legacy property keys in the configuration</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"> 25/Jul/2018 00:21 AM </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">Fix Versions:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 6.0.next </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">Since we're going to rename several properties as part of <span class="jira-issue-macro" data-jira-key="HSEARCH-859"> <a href="https://hibernate.atlassian.net/browse/HSEARCH-859" class="jira-issue-macro-key issue-link" title="Review names and composition of configuration properties" style="color: #3b73af; text-decoration: none"> <img class="icon" src="https://hibernate.atlassian.net/secure/viewavatar?size=xsmall&avatarId=12158&avatarType=issuetype"> HSEARCH-859 </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> , and several others just because of the overall architectural changes in Search 6 (introduction of a separate representation of backends that can be parameterized, in particular), configuring Search 6 may be a bit difficult when migrating from Search 5. Let's try to make that easier.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">The idea would be, when we can't find a value for a property, to fall back to the legacy name of that property, and to log a warning telling users their configuration uses deprecated configuration properties.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Several use cases:</p>
<ol>
<li>hibernate.search.someindex.someproperty => hibernate.search.index.someindex.someproperty</li>
<li>hibernate.search.someOrmSpecificProperty => hibernate.search.orm.someOrmSpecificProperty</li>
<li>hibernate.search.someindex.someProperty => hibernate.search.index.someindex.someRenamedProperty</li>
</ol> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">How to implement that is not immediately obvious:</p>
<ul>
<li>The solution must print the full property key in the warning, not just the radical. So we can't implement it in the ConfigurationProperty class, at least not <b>only</b> there.</li>
<li>As seen in example 3 above, the solution must work with both structural renamings like the addition of a ".index." prefix, and radical renamings</li>
</ul> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">We could implement a multiple solution:</p>
<ul>
<li>To handle structural renamings, Offer a way to add a fallback <b>with a warning</b> to a ConfigurationPropertySource. The resulting property source would print a warning each time it needs to use the fallback.</li>
<li>To handle radical renamings, either:
<ul>
<li>add a <tt>getWithFallback(Consumer<String> fallbackListener, String mainKey, String ... fallbackKeys)</tt> method to <tt>ConfigurationPropertySource</tt>. Then allow to set one or several fallback property keys in <tt>org.hibernate.search.v6poc.cfg.spi.KeyContext</tt>, so that whenever <tt>get</tt> is called on the resulting property, <tt>getWithFallback</tt> is called on the configuration property source.</li>
<li>OR carefully add wrappers to some configuration property sources that carry a list of property keys and what they should fall back to.</li>
</ul> </li>
</ul> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">We'll need to test it, and test it well... In particular double renamings as shown in example 3.</p> </td>
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