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| <h1 class="page">@PersistenceCapable (jdo)</h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The <code>@javax.jdo.annotation.PersistenceCapable</code> is used by JDO/DataNucleus to indicate that a class is a domain entity to be persisted to the database.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Apache Isis also checks for this annotation, and if the <code>@PersistenceCapable#schema</code> attribute is present will use it to form the object type.</p> |
| </div> |
| <div class="admonitionblock note"> |
| <table> |
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| <td class="content"> |
| <div class="paragraph"> |
| <p>Isis parses the <code>@PersistenceCapable</code> annotation from the Java source code; it does not query the JDO metamodel. |
| This means that it the <code>@PersistenceCapable</code> annotation must be used rather than the equivalent <code><class></code> <a href="http://www.datanucleus.org/products/accessplatform_4_0/jdo/class_mapping.html">XML metadata</a>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Moreover, while JDO/DataNucleus will recognize annotations on either the field or the getter method, Apache Isis (currently) only inspects the getter method. |
| Therefore ensure that the annotation is placed there.</p> |
| </div> |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>This value is used internally to generate a string representation of an objects identity (the <code>Oid</code>). |
| This can appear in several contexts, including:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>as the value of <code>Bookmark#getObjectType()</code> and in the <code>toString()</code> value of <code>Bookmark</code> |
| (see <a href="../applib/index/services/bookmark/BookmarkService.html" class="page">BookmarkService</a>)</p> |
| </li> |
| <li> |
| <p>in the serialization of <code>OidDto</code> in the <a href="../schema/cmd.html" class="page">command</a> and <a href="../schema/ixn.html" class="page">interaction</a> schemas</p> |
| </li> |
| <li> |
| <p>in the URLs of the <a href="../../../vro/2.0.0-M6/about.html" class="page">RestfulObjects viewer</a></p> |
| </li> |
| <li> |
| <p>in the URLs of the <a href="../../../vw/2.0.0-M6/about.html" class="page">Web UI (Wicket viewer)</a></p> |
| </li> |
| <li> |
| <p>in XML snapshots generated by the <a href="../applib/index/services/xmlsnapshot/XmlSnapshotService.html" class="page">XmlSnapshotService</a></p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>The actual format of the object type used by Apache Isis for the concatenation of <code>schema()</code> and <code>@PersistenceCapable#table()</code>. |
| If the <code>table()</code> is not present, then the class' simple name is used instead.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="examples"><a class="anchor" href="#examples"></a>Examples</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>For example:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@javax.jdo.annotations.PersistenceCapable(schema="custmgmt") |
| public class Customer { |
| ... |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>has an object type of <code>custmgmt.Customer</code>, while:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@javax.jdo.annotations.PersistenceCapable(schema="custmgmt", table="Address") |
| public class AddressImpl { |
| ... |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>has an object type of <code>custmgmt.Address</code>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>On the other hand:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@javax.jdo.annotations.PersistenceCapable(table="Address") |
| public class AddressImpl { |
| ... |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>does <em>not</em> correspond to an object type, because the <code>schema</code> attribute is missing.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="precedence"><a class="anchor" href="#precedence"></a>Precedence</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The rules of precedence for determining a domain object’s object type are:</p> |
| </div> |
| <div class="olist arabic"> |
| <ol class="arabic"> |
| <li> |
| <p><a href="Discriminator.html" class="page">@Discriminator</a></p> |
| </li> |
| <li> |
| <p><code>@DomainObject#logicalTypeName</code></p> |
| </li> |
| <li> |
| <p><a href="PersistenceCapable.html" class="page">@PersistenceCapable</a>, if at least the <code>schema</code> attribute is defined.</p> |
| <div class="paragraph"> |
| <p>If both <code>schema</code> and <code>table</code> are defined, then the value is “schema.table”. |
| If only <code>schema</code> is defined, then the value is “schema.className”.</p> |
| </div> |
| </li> |
| <li> |
| <p>Fully qualified class name of the entity.</p> |
| </li> |
| </ol> |
| </div> |
| <div class="admonitionblock tip"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-tip" title="Tip"></i> |
| </td> |
| <td class="content"> |
| <div class="paragraph"> |
| <p>This might be obvious, but to make explicit: we recommend that you always specify an object type for your domain objects.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Otherwise, if you refactor your code (change class name or move package), then any externally held references to the OID of the object will break. |
| At best this will require a data migration in the database; at worst it could cause external clients accessing data through the <a href="../../../vro/2.0.0-M6/about.html" class="page">Restful Objects</a> viewer to break.</p> |
| </div> |
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| </td> |
| <td class="content"> |
| <div class="paragraph"> |
| <p>If the object type is not unique across all domain classes then the framework will fail-fast and fail to boot. |
| An error message will be printed in the log to help you determine which classes have duplicate object tyoes.</p> |
| </div> |
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