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| <b>Release 2.5</b><br /></font></td> |
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| <div class="refsect1"> |
| <h2 class="refsect1"><font face="arial, helvetica, sans-serif" color="#330099">@Noncacheable</font></h2> |
| <p>Use <code>@Noncacheable</code> to configure caching behavior for relationships. If used on a relationship, that relationship <em>will not</em> be cached, even though the parent Entity may be cached.</p> |
| <a id="sthref239" name="sthref239"></a> |
| <p><strong><br /><span class="refsubsect">Annotation Elements</span></strong></p> |
| <p>There are no elements for this annotation.</p> |
| <a id="sthref240" name="sthref240"></a> |
| <p><strong><br /><span class="refsubsect">Usage</span></strong></p> |
| <p>Each time EclipseLink retrieves the Entity, the relationship will be reloaded from the datasource. This may be useful for situations where caching of relationships is not desired or when using different EclipseLink cache types and having cached references extends the cache lifetime of related Entities using a different caching scheme. For instance Entity A references Entity B, Entity A is Full and Entity B is Weak. Without removing the caching of the relationsip the Entity B's cache effectively become Full.</p> |
| <a id="sthref241" name="sthref241"></a> |
| <p><strong><br /><span class="refsubsect">Examples</span></strong></p> |
| <p><a href="#CHDDEGCI">Example 2-76</a> shows how to use <code>@Noncacheable</code> to create a protected cache.</p> |
| <div class="example"><a id="CHDDEGCI" name="CHDDEGCI"></a><a id="TLJPA473" name="TLJPA473"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 2-76 Using @Noncacheable Annotation</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| @Entity |
| @Cache( |
| isolation=CacheIsolationType.PROTECTED |
| ) |
| public class Employee { |
| @Id |
| private long id; |
| ... |
| @OneToMany(mappedBy="manager") |
| <strong>@Noncacheable</strong> |
| private List<Employee> managedEmployees; |
| ... |
| } |
| </pre></div> |
| <!-- class="example" --> |
| <p><a href="#CHDDFJCH">Example 2-77</a> shows using the <code><noncacheable></code> XML element in the <code>eclipselink-orm.xml</code> file.</p> |
| <div class="example"><a id="CHDDFJCH" name="CHDDFJCH"></a><a id="TLJPA474" name="TLJPA474"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 2-77 Using <noncacheable> XML</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| <?xml version="1.0"?> |
| <entity-mappings |
| xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/orm" |
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" |
| xsi:schemaLocation="http://www.eclipse.org/eclipselink/xsds/persistence/orm http://www.eclipse.org/eclipselink/xsds/eclipselink_orm_2_4.xsd" |
| version="2.4"> |
| <entity name="Employee" class="org.acme.Employee" access="FIELD"> |
| <cache isolation="PROTECTED"/> |
| <attributes> |
| <id name= "id"/> |
| <one-to-many name="managedEmployees" mapped-by="manager"> |
| <strong><noncacheable/></strong> |
| </one-to-many> |
| </attributes> |
| </entity> |
| </entity-mappings |
| </pre></div> |
| <!-- class="example" --> |
| <a id="sthref242" name="sthref242"></a> |
| <p><strong><br /><span class="refsubsect">See Also</span></strong></p> |
| <p>For more information, see:</p> |
| <ul> |
| <li> |
| <p>"Caching"<br /> |
| <code><a href="http://wiki.eclipse.org/EclipseLink/UserGuide/JPA/Basic_JPA_Development/Caching">http://wiki.eclipse.org/EclipseLink/UserGuide/JPA/Basic_JPA_Development/Caching</a></code></p> |
| </li> |
| <li> |
| <p>"EclipseLink Caches" in <em>Understanding EclipseLink</em></p> |
| </li> |
| <li> |
| <p>"Scaling EclipseLink Applications in Clusters" in <em>Solutions Guide for EclispeLink</em></p> |
| </li> |
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