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| javax.jdo</FONT> |
| <BR> |
| Interface InstanceCallbacks</H2> |
| <HR> |
| <DL> |
| <DT>public interface <B>InstanceCallbacks</B></DL> |
| |
| <P> |
| A <code>PersistenceCapable</code> class that provides callback methods for life |
| cycle events implements this interface. |
| |
| <P>Classes which include non-persistent fields whose values depend |
| on the values of persistent fields require callbacks on specific |
| JDO instance life cycle events in order to correctly populate the |
| values in these fields. |
| |
| <P>This interface defines the methods executed |
| by the <code>PersistenceManager</code> for these life cycle events. If the class |
| implements <code>InstanceCallbacks</code>, it must explicitly declare it in the |
| class definition. |
| |
| <P>The callbacks might also be used if the persistent instances |
| need to be put into the runtime infrastructure of the application. |
| For example, a persistent instance might notify other instances |
| on changes to state. The persistent instance is in a list of |
| managed instances, and when the persistent instance is made hollow, |
| it can no longer generate change events, and the persistent |
| instance should be removed from the list of managed instances. |
| |
| <P>To implement this, the application programmer would implement |
| the <code>jdoPostLoad</code> callback to put itself into the list of managed |
| instances; and implement the <code>jdoPreClear</code> to remove itself from |
| the list. |
| |
| <P>Note that JDO does not manage the state of non-persistent |
| fields, and when a JDO instance transitions to hollow, JDO clears |
| the persistent fields. It is the programmer's responsibility to |
| clear non-persistent fields so that garbage collection of |
| referred instances can occur. |
| <P> |
| |
| <P> |
| <DL> |
| <DT><B>Version:</B></DT> |
| <DD>1.0</DD> |
| <DT><B>Author:</B></DT> |
| <DD>Craig Russell</DD> |
| </DL> |
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| <CODE> void</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/jdo/InstanceCallbacks.html#jdoPostLoad()">jdoPostLoad</A></B>()</CODE> |
| |
| <BR> |
| Called after the values are loaded from the data store into |
| this instance.</TD> |
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| <CODE> void</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/jdo/InstanceCallbacks.html#jdoPreClear()">jdoPreClear</A></B>()</CODE> |
| |
| <BR> |
| Called before the values in the instance are cleared.</TD> |
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| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> void</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/jdo/InstanceCallbacks.html#jdoPreDelete()">jdoPreDelete</A></B>()</CODE> |
| |
| <BR> |
| Called before the instance is deleted.</TD> |
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| <CODE> void</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/jdo/InstanceCallbacks.html#jdoPreStore()">jdoPreStore</A></B>()</CODE> |
| |
| <BR> |
| Called before the values are stored from this instance to the |
| data store.</TD> |
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| <A NAME="jdoPostLoad()"><!-- --></A><H3> |
| jdoPostLoad</H3> |
| <PRE> |
| public void <B>jdoPostLoad</B>()</PRE> |
| <DL> |
| <DD>Called after the values are loaded from the data store into |
| this instance. |
| |
| <P>This method is not modified by the Reference Enhancer. |
| <P>Derived fields should be initialized in this method. |
| The context in which this call is made does not allow access to |
| other persistent JDO instances. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="jdoPreStore()"><!-- --></A><H3> |
| jdoPreStore</H3> |
| <PRE> |
| public void <B>jdoPreStore</B>()</PRE> |
| <DL> |
| <DD>Called before the values are stored from this instance to the |
| data store. |
| |
| <P>Data store fields that might have been affected by modified |
| non-persistent fields should be updated in this method. |
| |
| <P>This method is modified by the enhancer so that changes to |
| persistent fields will be reflected in the data store. |
| The context in which this call is made allows access to the |
| <code>PersistenceManager</code> and other persistent JDO instances. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="jdoPreClear()"><!-- --></A><H3> |
| jdoPreClear</H3> |
| <PRE> |
| public void <B>jdoPreClear</B>()</PRE> |
| <DL> |
| <DD>Called before the values in the instance are cleared. |
| |
| <P>Transient fields should be cleared in this method. |
| Associations between this |
| instance and others in the runtime environment should be cleared. |
| |
| <P>This method is not modified by the enhancer. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="jdoPreDelete()"><!-- --></A><H3> |
| jdoPreDelete</H3> |
| <PRE> |
| public void <B>jdoPreDelete</B>()</PRE> |
| <DL> |
| <DD>Called before the instance is deleted. |
| This method is called before the state transition to persistent-deleted |
| or persistent-new-deleted. Access to field values within this call |
| are valid. Access to field values after this call are disallowed. |
| <P>This method is modified by the enhancer so that fields referenced |
| can be used in the business logic of the method. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
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