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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-10992" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-2dc3b339-6f82-41c3-8aa3-de6276725a4d" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-10992" style="color: #3b73af; text-decoration: none">HHH-10992</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-10992" style="color: #3b73af; text-decoration: none">Extend support for integrator-contributed domain and relational objects</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"> <a class="user-hover" rel="steve" id="email_steve" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=steve" style="color:#6c797f;; color: #3b73af; text-decoration: none">Steve Ebersole</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"> <span class="diffaddedchars" style="background-color:#ddfade;">Integrations such as Hibernate Search and Hibernate Envers often provide extensions to the domain and relational models. This poses 2 distinct yet related things we need to consider:<br># These integrator-contributed mapping objects are not part of the user's domain model. As such they really should not be available for querying - they are intended just for use by the integration. Generally if they are "queryable" the integration provides a DSL querying capability. We are terming this "hidden". <br># A related concern is the ability to control schema tooling per integration. The idea here is that the application's relation model already exists, but they may have just enabled Search or Envers and may want to export just those relational objects. ATM this is not possible as schema tooling settings apply to all relational objects regardless of "source".<br><br>We discussed this on HipChat and the consensus for an initial plan was as follows...<br><br>h2. New {{source}} value<br><br>The idea for this support is predicated on a new {{source}} value added to the mapping objects (see {{org.hibernate.boot.model}}) indicating their "source". E.g. Hibernate ORM, e.g., would set this to "orm"; Search would set it to "search"; Envers to "envers". Other integrations would pick a unique "source key".<br><br>Since it is integrators defining these mapping objects they would control the source value.<br><br>h2. Hiding these integrator-contributed domain objects<br><br>This would come into play for querying, and possibly when attempting to locate the domain descriptors (EntityDescriptor e.g.). Anything that is {{source != "orm"}} would not be available for querying *by default*. We discussed possibly allowing a query hint that would indicate that the user wants to directly query the non-application objects by source-name(s); something like {{query.setHint( "...allow_hidden_entities", true )}} (default == false) or better yet a multi-valued hint ala {{query.setHint( "...allow_hidden_entities", "search" )}} or {{query.setHint( "...allow_hidden_entities", "envers,search" )}}.<br><br>We may also apply this restriction to the methods to access the domain descriptors, again possibly overloaded to allow something like the hint discussed above.<br><br>h2. Schema tooling<br><br>Currently schema tooling is defined for the entire set of relational objects. This is makes it difficult for existing Hibernate ORM users to add these integrators into their stack because if they want those added relational objects exported, e.g., they have to export the entire relational model as known to Hibernate.<br><br>The idea here to allow controlling schema management for the various integration-contributed relational objects, again leveraging this {{source}} value. We'd expand the current {{hibernate.hbm2ddl}} setting to be source-specific using the pattern {{hibernate.hbm2ddl.[source]}}. The legacy {{hibernate.hbm2ddl}} value (no {{[source]}}) would be interpreted as either (1) {{"all"}} or (2) {{"orm"}}. {{"orm"}} would be more appropriate, but {{"all"}} would match the legacy behavior.<br><br>----<br>h2. Original description<br><br></span> <span class="diffcontext">It has become evident with integrations with Hibernate Search and Hibernate Envers that there are domain specific entity models that ideally would be useful to be module/system/domain -scoped to these integrations rather than be exposing them as a part of the user-scoped domain model.<br><br>A few ideas of brainstorming are:<br><br>For example, providing an {{@Hidden}} annotation that allows an entity model to be identified as something which isn't part of the user-scoped domain model. There are other alternatives for providing mappings such as JAXB or manually providing the mapping model to Hibernate in which we'd need to add support for these new system-scoped models.<br><br>For cases where the class may not be on the Hibernate ClassLoader, such as WildFly, we'd also need to provide a way for the class to be provided to Hibernate directly.<br><br>And lastly, we'd need to provide a way for these module/system/domain -scoped models to be queryable by their respective domains at runtime, while protecting them from normal user queries.</span> </td>
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