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| <h2 title="Interface ChangeTracker" class="title">Interface ChangeTracker</h2> |
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| <dt>All Known Subinterfaces:</dt> |
| <dd><a href="../../../../org/apache/openjpa/util/CollectionChangeTracker.html" title="interface in org.apache.openjpa.util">CollectionChangeTracker</a>, <a href="../../../../org/apache/openjpa/util/MapChangeTracker.html" title="interface in org.apache.openjpa.util">MapChangeTracker</a></dd> |
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| <dl> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><a href="../../../../org/apache/openjpa/util/AbstractChangeTracker.html" title="class in org.apache.openjpa.util">AbstractChangeTracker</a>, <a href="../../../../org/apache/openjpa/util/AbstractLRSProxyCollection.html" title="class in org.apache.openjpa.util">AbstractLRSProxyCollection</a>, <a href="../../../../org/apache/openjpa/util/AbstractLRSProxyMap.html" title="class in org.apache.openjpa.util">AbstractLRSProxyMap</a>, <a href="../../../../org/apache/openjpa/util/CollectionChangeTrackerImpl.html" title="class in org.apache.openjpa.util">CollectionChangeTrackerImpl</a>, <a href="../../../../org/apache/openjpa/util/DelayedCollectionChangeTrackerImpl.html" title="class in org.apache.openjpa.util">DelayedCollectionChangeTrackerImpl</a>, <a href="../../../../org/apache/openjpa/jdbc/meta/strats/LRSProxyCollection.html" title="class in org.apache.openjpa.jdbc.meta.strats">LRSProxyCollection</a>, <a href="../../../../org/apache/openjpa/util/MapChangeTrackerImpl.html" title="class in org.apache.openjpa.util">MapChangeTrackerImpl</a></dd> |
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| <br> |
| <pre>public interface <span class="strong">ChangeTracker</span></pre> |
| <div class="block">Interface for components that track changes to containers at a |
| fine-grained level. Proxies that use change trackers might have better |
| update performance than non-tracking proxies.</div> |
| <dl><dt><span class="strong">Author:</span></dt> |
| <dd>Abe White</dd></dl> |
| </li> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code><a href="http://download.oracle.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a></code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/openjpa/util/ChangeTracker.html#getAdded()">getAdded</a></strong>()</code> |
| <div class="block">Return the collection of values that need to be added to the managed |
| container.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code><a href="http://download.oracle.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a></code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/openjpa/util/ChangeTracker.html#getChanged()">getChanged</a></strong>()</code> |
| <div class="block">Return the set of elements that have changed.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/openjpa/util/ChangeTracker.html#getNextSequence()">getNextSequence</a></strong>()</code> |
| <div class="block">The next element sequence value for this proxy at load time.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code><a href="http://download.oracle.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a></code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/openjpa/util/ChangeTracker.html#getRemoved()">getRemoved</a></strong>()</code> |
| <div class="block">Return the set of values that need to be removed from the managed |
| container.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/openjpa/util/ChangeTracker.html#isTracking()">isTracking</a></strong>()</code> |
| <div class="block">Return true if this tracker has an up-to-date view of all the changes |
| to the container it is managing.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/openjpa/util/ChangeTracker.html#setNextSequence(int)">setNextSequence</a></strong>(int seq)</code> |
| <div class="block">The maximum element sequence value for this proxy at load time.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/openjpa/util/ChangeTracker.html#startTracking()">startTracking</a></strong>()</code> |
| <div class="block">Reset the state of the change tracker, and turn change tracking back |
| on if it has been disabled.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><strong><a href="../../../../org/apache/openjpa/util/ChangeTracker.html#stopTracking()">stopTracking</a></strong>()</code> |
| <div class="block">Tell the tracker to stop tracking changes for its container.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </li> |
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| <a name="isTracking()"> |
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| <h4>isTracking</h4> |
| <pre>boolean isTracking()</pre> |
| <div class="block">Return true if this tracker has an up-to-date view of all the changes |
| to the container it is managing.</div> |
| </li> |
| </ul> |
| <a name="startTracking()"> |
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| <h4>startTracking</h4> |
| <pre>void startTracking()</pre> |
| <div class="block">Reset the state of the change tracker, and turn change tracking back |
| on if it has been disabled.</div> |
| </li> |
| </ul> |
| <a name="stopTracking()"> |
| <!-- --> |
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| <h4>stopTracking</h4> |
| <pre>void stopTracking()</pre> |
| <div class="block">Tell the tracker to stop tracking changes for its container.</div> |
| </li> |
| </ul> |
| <a name="getAdded()"> |
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| <h4>getAdded</h4> |
| <pre><a href="http://download.oracle.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a> getAdded()</pre> |
| <div class="block">Return the collection of values that need to be added to the managed |
| container.</div> |
| </li> |
| </ul> |
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| <!-- --> |
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| <h4>getRemoved</h4> |
| <pre><a href="http://download.oracle.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a> getRemoved()</pre> |
| <div class="block">Return the set of values that need to be removed from the managed |
| container.</div> |
| </li> |
| </ul> |
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| <h4>getChanged</h4> |
| <pre><a href="http://download.oracle.com/javase/6/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a> getChanged()</pre> |
| <div class="block">Return the set of elements that have changed. In maps, this marks a |
| possible change in value for a key. In collections, this marks an |
| element that has been removed and re-added.</div> |
| </li> |
| </ul> |
| <a name="getNextSequence()"> |
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| <h4>getNextSequence</h4> |
| <pre>int getNextSequence()</pre> |
| <div class="block">The next element sequence value for this proxy at load time. |
| If the data store keeps this proxy's data in sequence order but allows |
| holes for removed objects, the implementation can set the next |
| sequence at load time, then retrieve it and start from there for |
| added objects at flush time. This value is set back to 0 if the |
| proxy stops tracking changes. For ordered proxies, it is set to the |
| proxy's size when the proxy starts tracking changes again.</div> |
| </li> |
| </ul> |
| <a name="setNextSequence(int)"> |
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| <h4>setNextSequence</h4> |
| <pre>void setNextSequence(int seq)</pre> |
| <div class="block">The maximum element sequence value for this proxy at load time. |
| If the data store keeps this proxy's data in sequence order but allows |
| holes for removed objects, the implementation can set the next |
| sequence at load time, then retrieve it and start from there for |
| added objects at flush time. This value is set back to 0 if the |
| proxy stops tracking changes. For ordered proxies, it is set to the |
| proxy's size when the proxy starts tracking changes again.</div> |
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