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| <h2 title="Class FlushClearCache" class="title">Class FlushClearCache</h2> |
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| <pre>public class <span class="typeNameLabel">FlushClearCache</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">FlushClearCache persistence property |
| defines modes of cache handling after em.flush call followed by em.clear call. |
| This property could be specified while creating either EntityManagerFactory |
| (createEntityManagerFactory or persistence.xml) |
| or EntityManager (createEntityManager); the latter overrides the former. |
| |
| <p>JPA persistence property Usage: |
| |
| <p><code>properties.add(PersistenceUnitProperties.FLUSH_CLEAR_CACHE, FlushClearCache.Drop);</code> |
| |
| <p>Values are case-insensitive. |
| "" could be used instead of default value FlushClearCache.DEFAULT.</div> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
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| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/config/FlushClearCache.html#DEFAULT">DEFAULT</a></span></code> </td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/config/FlushClearCache.html#Drop">Drop</a></span></code> |
| <div class="block">Call to clear method causes to drop the whole EntityManager cache.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/config/FlushClearCache.html#DropInvalidate">DropInvalidate</a></span></code> |
| <div class="block">Call to clear method causes to drops the whole EntityManager cache, |
| on commit the classes that have at least one object updated or deleted |
| are invalidated in the shared cache.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/config/FlushClearCache.html#Merge">Merge</a></span></code> |
| <div class="block">Call to clear method causes to drop from EntityManager cache only the objects that haven't been flushed.</div> |
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| <h4>Merge</h4> |
| <pre>public static final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> Merge</pre> |
| <div class="block">Call to clear method causes to drop from EntityManager cache only the objects that haven't been flushed. |
| This is the most accurate mode: shared cache is perfect after commit; |
| but the least memory effective: smbd repeatedly using flush followed by clear |
| may eventually run out of memory in a huge transaction.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.eclipse.persistence.config.FlushClearCache.Merge">Constant Field Values</a></dd> |
| </dl> |
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| <h4>Drop</h4> |
| <pre>public static final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> Drop</pre> |
| <div class="block">Call to clear method causes to drop the whole EntityManager cache. |
| This is the fasteset and using the least memory mode - |
| but after commit the shared cache potentially contains stale data.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.eclipse.persistence.config.FlushClearCache.Drop">Constant Field Values</a></dd> |
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| <h4>DropInvalidate</h4> |
| <pre>public static final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> DropInvalidate</pre> |
| <div class="block">Call to clear method causes to drops the whole EntityManager cache, |
| on commit the classes that have at least one object updated or deleted |
| are invalidated in the shared cache. |
| This is a compromise mode: potentially a bit slower than drop, |
| but has virtually the same memory efficiency. |
| After commit all potentially stale data is invalidated in the shared cache.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.eclipse.persistence.config.FlushClearCache.DropInvalidate">Constant Field Values</a></dd> |
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| <h4>DEFAULT</h4> |
| <pre>public static final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> DEFAULT</pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../constant-values.html#org.eclipse.persistence.config.FlushClearCache.DEFAULT">Constant Field Values</a></dd> |
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| <pre>public FlushClearCache()</pre> |
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