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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-10714" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-380ba506-fbb1-4abc-9dda-7c58bc84439b" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-10714" style="color: #3b73af; text-decoration: none">HHH-10714</a> </td>
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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-10714" style="color: #3b73af; text-decoration: none">Add support for @Immutable attribute types</a> </span> </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">Change By:</th>
<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="mih_vlad" id="email_mih_vlad" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=mih_vlad" style="color:#6c797f;; color: #3b73af; text-decoration: none">Vlad Mihalcea</a> </td>
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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">Currently, {{@Immutable}} works for entities and collections, as indicated by [ANN-542|https://hibernate.atlassian.net/browse/ANN-542].<br><br>By adding support for</span> <span class="diffremovedchars" style="background-color: #ffe7e7; text-decoration:line-through;"> attributes</span> <span class="diffaddedchars" style="background-color:#ddfade;"> attribute types</span> <span class="diffcontext">, we can benefit from:<br><br>* lower memory consumption (no need to create copies for checking if entity is dirty or to put/read it from cache) - especially in cases where entity contains JSON documents<br>* faster flush operations</span> <span class="diffaddedchars" style="background-color:#ddfade;"><br><br>An immutable attribute type looks like this:<br><br>{code:java}<br>@Immutable<br>public class Caption {<br><br> private String text;<br><br> public Caption(String text) {<br> this.text = text;<br> }<br><br> public String getText() {<br> return text;<br> }<br><br> public void setText(String text) {<br> this.text = text;<br> }<br><br> @Override<br> public boolean equals(Object o) {<br> if ( this == o ) {<br> return true;<br> }<br> if ( o == null || getClass() != o.getClass() ) {<br> return false;<br> }<br> Caption caption = (Caption) o;<br> return text != null ? text.equals( caption.text ) : caption.text == null;<br><br> }<br><br> @Override<br> public int hashCode() {<br> return text != null ? text.hashCode() : 0;<br> }<br>}<br>{code}<br><br>And it is used as follows:<br><br>{code:java}<br>@Entity<br>@SuppressWarnings("serial")<br>public class Photo implements Serializable {<br><br> private Integer id;<br><br> private String name;<br><br> private Exif metadata;<br><br> private Caption caption;<br><br> @Id<br> @GeneratedValue<br> public Integer getId() {<br> return id;<br> }<br><br> public String getName() {<br> return name;<br> }<br><br> public void setId(Integer integer) {<br> id = integer;<br> }<br><br> public void setName(String string) {<br> name = string;<br> }<br><br> public Exif getMetadata() {<br> return metadata;<br> }<br><br> public void setMetadata(Exif metadata) {<br> this.metadata = metadata;<br> }<br><br> @Convert(converter = CaptionConverter.class)<br> public Caption getCaption() {<br> return caption;<br> }<br><br> public void setCaption(Caption caption) {<br> this.caption = caption;<br> }<br>}<br>{code}<br><br>The {{@Immutable}} annotation still cannot be applied on fields directy, but it <br></span> </td>
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