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<td class="page-title-pattern-first-line " style="padding: 0px; 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-10198" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-8a39851a-b2c1-45e6-9e98-948c9ebf4be1" height="16" width="16" border="0" align="absmiddle" alt="New Feature" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-10198" style="color: #3b73af; text-decoration: none">HHH-10198</a>
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<td style="vertical-align: top;; padding: 0px; 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-10198" style="color: #3b73af; text-decoration: none">Consider design for annotation for custom IdentifierGenerator declarations</a> </span>
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Change By:
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<td style="padding: 0px; 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>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <span class="diffcontext">Consider the pattern used for {{org.hibernate.annotations.ValueGenerationType}}.<br /><br />In some ways this is an extension to {{GenericGenerator}}. One option is to define this annotation with the intention that it be attached to the custom {{org.hibernate.id.IdentifierGenerator}} implementation class for discovery and some basic configuration. E.g.<br /><br />{code}<br />@ThisNewAnnotation<br />public class MyCustomGenerator implements IdentifierGenerator {<br /> ...<br />}<br />{code}<br /><br />Like we did with {{ValueGenerationType}}, I would love for this to express how the implementation should be configured from annotation values. Not sure exactly how this would look, but something like:<br /><br /><br />{code}<br />/**<br /> * Annotation to identify IdentifierGenerator implementations<br /> */<br />public @interface GeneratorImplementation {<br /> // this allows non-indexed (Jandex) resolutions. Do we want/need it?<br /> // The Jndex-y option is to simply find instances of this annotation<br /> // and look it their targets<br /> Class[] generatorImpls();<br />}<br /><br />/**<br /> * Extended IdentifierGenerator contract to account for annotation consumption<br />*/<br />public interface AnnotationBasedIdentifierGenerator<A extends Annotation,T extends Serializable><br /> extends IdentifierGenerator {<br /> /**<br /> * Consume the annotation (configuration)<br /> */<br /> void initialize(A ann);<br /><br /> @Override<br /> T generate(SessionImplementor session, Object object);<br />}<br /></span> <span class="diffaddedchars" style="background-color:#ddfade;">{code}</span> <span class="diffcontext"><br /><br /></span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;">// Sample usage ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span> <span class="diffcontext"><br /></span> <span class="diffaddedchars" style="background-color:#ddfade;">{code}</span> <span class="diffcontext"><br />/**<br /> * My custom generator annotation<br /> */<br />public interface @UuidGenerator {<br /> enum Strategy( RANDOM, RFC_4122 )<br /><br /> String name();<br /> Strategy strategy() default RFC_4122;<br />}<br /><br />@GeneratorImplementation<br />public class UuidIdentifierGenerator <br /> implements AnnotationBasedIdentifierGenerator<UuidGenerator,UUID> {<br /><br /> private String generatorName;<br /> private UUIDGenerationStrategy uuidGenStrategy;<br /><br /> @Override<br /> public void initialize(UuidGenerator ann) {<br /> this.generatorName = ann.name();<br /> this.uuidGenStrategy = decodeStrategy( ann.strategy() );<br /> }<br /><br /> private UUIDGenerationStrategy decodeStrategy(Strategy strategy) {<br /> switch( strategy ) {<br /> ...<br /> }<br /> }<br /><br /> @Override<br /> UUID generate(SessionImplementor session, Object object) {<br /> return uuidGenStrategy.generateUUID( session );<br /> }<br />}<br /><br />public class MyEntity {<br /> @GeneratedValue<br /> @UuidGenerator(strategy=RANDOM)<br /> private UUID id;<br /><br /> ...<br />}<br />{code}</span>
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