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| <H2> |
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| javax.jdo</FONT> |
| <BR> |
| Interface Transaction</H2> |
| <HR> |
| <DL> |
| <DT>public interface <B>Transaction</B></DL> |
| |
| <P> |
| The JDO <code>Transaction</code> interface provides for initiation and completion |
| of transactions under user control. |
| It is a sub-interface of the <A HREF="../../javax/jdo/PersistenceManager.html" title="interface in javax.jdo"><CODE>PersistenceManager</CODE></A> |
| that deals with options and transaction demarcation. |
| <P>Transaction options include whether optimistic concurrency |
| control should be used for the current transaction, whether instances |
| may hold values in the cache outside transactions, and whether |
| values should be retained in the cache after transaction completion. These |
| options are valid for both managed and non-managed transactions. |
| |
| <P>Transaction completion methods have the same semantics as |
| <code>javax.transaction.UserTransaction</code>, and are valid only in the |
| non-managed, non-distributed transaction environment. |
| <P>For operation in the distributed environment, <code>Transaction</code> is declared |
| to implement <code>javax.transaction.Synchronization</code>. This allows for |
| flushing the cache to the data store during externally managed |
| transaction completion. |
| <P> |
| |
| <P> |
| <DL> |
| <DT><B>Version:</B></DT> |
| <DD>1.0</DD> |
| <DT><B>Author:</B></DT> |
| <DD>Craig Russell</DD> |
| </DL> |
| <HR> |
| |
| <P> |
| <!-- ======== NESTED CLASS SUMMARY ======== --> |
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| <!-- =========== FIELD SUMMARY =========== --> |
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| <B>Method Summary</B></FONT></TD> |
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| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> void</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/jdo/Transaction.html#begin()">begin</A></B>()</CODE> |
| |
| <BR> |
| Begin a transaction.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> void</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/jdo/Transaction.html#commit()">commit</A></B>()</CODE> |
| |
| <BR> |
| Commit the current transaction.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> boolean</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/jdo/Transaction.html#getNontransactionalRead()">getNontransactionalRead</A></B>()</CODE> |
| |
| <BR> |
| If <code>true</code>, allows persistent instances to be read without |
| a transaction active.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> boolean</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/jdo/Transaction.html#getNontransactionalWrite()">getNontransactionalWrite</A></B>()</CODE> |
| |
| <BR> |
| If <code>true</code>, allows persistent instances to be written without |
| a transaction active.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> boolean</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/jdo/Transaction.html#getOptimistic()">getOptimistic</A></B>()</CODE> |
| |
| <BR> |
| Optimistic transactions do not hold data store locks until commit time.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> <A HREF="../../javax/jdo/PersistenceManager.html" title="interface in javax.jdo">PersistenceManager</A></CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/jdo/Transaction.html#getPersistenceManager()">getPersistenceManager</A></B>()</CODE> |
| |
| <BR> |
| The <code>Transaction</code> instance is always associated with exactly one |
| <code>PersistenceManager</code>.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> boolean</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/jdo/Transaction.html#getRestoreValues()">getRestoreValues</A></B>()</CODE> |
| |
| <BR> |
| Return the current value of the restoreValues property.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> boolean</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/jdo/Transaction.html#getRetainValues()">getRetainValues</A></B>()</CODE> |
| |
| <BR> |
| If <code>true</code>, at commit time instances retain their field values.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> javax.transaction.Synchronization</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/jdo/Transaction.html#getSynchronization()">getSynchronization</A></B>()</CODE> |
| |
| <BR> |
| The user-specified <code>Synchronization</code> instance for this <code>Transaction</code> instance.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> boolean</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/jdo/Transaction.html#isActive()">isActive</A></B>()</CODE> |
| |
| <BR> |
| Returns whether there is a transaction currently active.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> void</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/jdo/Transaction.html#rollback()">rollback</A></B>()</CODE> |
| |
| <BR> |
| Roll back the current transaction.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> void</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/jdo/Transaction.html#setNontransactionalRead(boolean)">setNontransactionalRead</A></B>(boolean nontransactionalRead)</CODE> |
| |
| <BR> |
| If <code>true</code>, allow persistent instances to be read without |
| a transaction active.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> void</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/jdo/Transaction.html#setNontransactionalWrite(boolean)">setNontransactionalWrite</A></B>(boolean nontransactionalWrite)</CODE> |
| |
| <BR> |
| If <code>true</code>, allow persistent instances to be written without |
| a transaction active.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> void</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/jdo/Transaction.html#setOptimistic(boolean)">setOptimistic</A></B>(boolean optimistic)</CODE> |
| |
| <BR> |
| Optimistic transactions do not hold data store locks until commit time.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> void</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/jdo/Transaction.html#setRestoreValues(boolean)">setRestoreValues</A></B>(boolean restoreValues)</CODE> |
| |
| <BR> |
| If <code>true</code>, at rollback, fields of newly persistent instances |
| are restored to |
| their values as of the beginning of the transaction, and the instances |
| revert to transient.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> void</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/jdo/Transaction.html#setRetainValues(boolean)">setRetainValues</A></B>(boolean retainValues)</CODE> |
| |
| <BR> |
| If <code>true</code>, at commit instances retain their values and the instances |
| transition to persistent-nontransactional.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> void</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../javax/jdo/Transaction.html#setSynchronization(javax.transaction.Synchronization)">setSynchronization</A></B>(javax.transaction.Synchronization sync)</CODE> |
| |
| <BR> |
| The user can specify a <code>Synchronization</code> instance to be notified on |
| transaction completions.</TD> |
| </TR> |
| </TABLE> |
| |
| <P> |
| |
| <!-- ============ FIELD DETAIL =========== --> |
| |
| |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| |
| |
| <!-- ============ METHOD DETAIL ========== --> |
| |
| <A NAME="method_detail"><!-- --></A> |
| <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
| <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
| <TD COLSPAN=1><FONT SIZE="+2"> |
| <B>Method Detail</B></FONT></TD> |
| </TR> |
| </TABLE> |
| |
| <A NAME="begin()"><!-- --></A><H3> |
| begin</H3> |
| <PRE> |
| public void <B>begin</B>()</PRE> |
| <DL> |
| <DD>Begin a transaction. The type of transaction is determined by the |
| setting of the Optimistic flag. |
| <P> |
| <DD><DL> |
| |
| <DT><B>Throws:</B> |
| <DD><CODE><A HREF="../../javax/jdo/JDOUserException.html" title="class in javax.jdo">JDOUserException</A></CODE> - if transactions are managed by a container |
| in the managed environment, or if the transaction is already active.<DT><B>See Also:</B><DD><A HREF="../../javax/jdo/Transaction.html#setOptimistic(boolean)"><CODE>setOptimistic(boolean)</CODE></A>, |
| <A HREF="../../javax/jdo/Transaction.html#getOptimistic()"><CODE>getOptimistic()</CODE></A></DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="commit()"><!-- --></A><H3> |
| commit</H3> |
| <PRE> |
| public void <B>commit</B>()</PRE> |
| <DL> |
| <DD>Commit the current transaction. |
| <P> |
| <DD><DL> |
| |
| <DT><B>Throws:</B> |
| <DD><CODE><A HREF="../../javax/jdo/JDOUserException.html" title="class in javax.jdo">JDOUserException</A></CODE> - if transactions are managed by a container |
| in the managed environment, or if the transaction is not active.</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="rollback()"><!-- --></A><H3> |
| rollback</H3> |
| <PRE> |
| public void <B>rollback</B>()</PRE> |
| <DL> |
| <DD>Roll back the current transaction. |
| <P> |
| <DD><DL> |
| |
| <DT><B>Throws:</B> |
| <DD><CODE><A HREF="../../javax/jdo/JDOUserException.html" title="class in javax.jdo">JDOUserException</A></CODE> - if transactions are managed by a container |
| in the managed environment, or if the transaction is not active.</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="isActive()"><!-- --></A><H3> |
| isActive</H3> |
| <PRE> |
| public boolean <B>isActive</B>()</PRE> |
| <DL> |
| <DD>Returns whether there is a transaction currently active. |
| <P> |
| <DD><DL> |
| |
| <DT><B>Returns:</B><DD><code>true</code> if the transaction is active.</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="setNontransactionalRead(boolean)"><!-- --></A><H3> |
| setNontransactionalRead</H3> |
| <PRE> |
| public void <B>setNontransactionalRead</B>(boolean nontransactionalRead)</PRE> |
| <DL> |
| <DD>If <code>true</code>, allow persistent instances to be read without |
| a transaction active. |
| If an implementation does not support this option, a |
| <code>JDOUnsupportedOptionException</code> is thrown. |
| <P> |
| <DD><DL> |
| <DT><B>Parameters:</B><DD><CODE>nontransactionalRead</CODE> - the value of the nontransactionalRead property</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="getNontransactionalRead()"><!-- --></A><H3> |
| getNontransactionalRead</H3> |
| <PRE> |
| public boolean <B>getNontransactionalRead</B>()</PRE> |
| <DL> |
| <DD>If <code>true</code>, allows persistent instances to be read without |
| a transaction active. |
| <P> |
| <DD><DL> |
| |
| <DT><B>Returns:</B><DD>the value of the nontransactionalRead property</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="setNontransactionalWrite(boolean)"><!-- --></A><H3> |
| setNontransactionalWrite</H3> |
| <PRE> |
| public void <B>setNontransactionalWrite</B>(boolean nontransactionalWrite)</PRE> |
| <DL> |
| <DD>If <code>true</code>, allow persistent instances to be written without |
| a transaction active. |
| If an implementation does not support this option, a |
| <code>JDOUnsupportedOptionException</code> is thrown. |
| <P> |
| <DD><DL> |
| <DT><B>Parameters:</B><DD><CODE>nontransactionalWrite</CODE> - the value of the nontransactionalRead property</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="getNontransactionalWrite()"><!-- --></A><H3> |
| getNontransactionalWrite</H3> |
| <PRE> |
| public boolean <B>getNontransactionalWrite</B>()</PRE> |
| <DL> |
| <DD>If <code>true</code>, allows persistent instances to be written without |
| a transaction active. |
| <P> |
| <DD><DL> |
| |
| <DT><B>Returns:</B><DD>the value of the nontransactionalWrite property</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="setRetainValues(boolean)"><!-- --></A><H3> |
| setRetainValues</H3> |
| <PRE> |
| public void <B>setRetainValues</B>(boolean retainValues)</PRE> |
| <DL> |
| <DD>If <code>true</code>, at commit instances retain their values and the instances |
| transition to persistent-nontransactional. |
| If an implementation does not support this option, a |
| <code>JDOUnsupportedOptionException</code> is thrown. |
| <P> |
| <DD><DL> |
| <DT><B>Parameters:</B><DD><CODE>retainValues</CODE> - the value of the retainValues property</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="getRetainValues()"><!-- --></A><H3> |
| getRetainValues</H3> |
| <PRE> |
| public boolean <B>getRetainValues</B>()</PRE> |
| <DL> |
| <DD>If <code>true</code>, at commit time instances retain their field values. |
| <P> |
| <DD><DL> |
| |
| <DT><B>Returns:</B><DD>the value of the retainValues property</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="setRestoreValues(boolean)"><!-- --></A><H3> |
| setRestoreValues</H3> |
| <PRE> |
| public void <B>setRestoreValues</B>(boolean restoreValues)</PRE> |
| <DL> |
| <DD>If <code>true</code>, at rollback, fields of newly persistent instances |
| are restored to |
| their values as of the beginning of the transaction, and the instances |
| revert to transient. Additionally, fields of modified |
| instances of primitive types and immutable reference types |
| are restored to their values as of the beginning of the |
| transaction. |
| <P>If <code>false</code>, at rollback, the values of fields of |
| newly persistent instances are unchanged and the instances revert to |
| transient. Additionally, dirty instances transition to hollow. |
| If an implementation does not support this option, a |
| <code>JDOUnsupportedOptionException</code> is thrown. |
| <P> |
| <DD><DL> |
| <DT><B>Parameters:</B><DD><CODE>restoreValues</CODE> - the value of the restoreValues property</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="getRestoreValues()"><!-- --></A><H3> |
| getRestoreValues</H3> |
| <PRE> |
| public boolean <B>getRestoreValues</B>()</PRE> |
| <DL> |
| <DD>Return the current value of the restoreValues property. |
| <P> |
| <DD><DL> |
| |
| <DT><B>Returns:</B><DD>the value of the restoreValues property</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="setOptimistic(boolean)"><!-- --></A><H3> |
| setOptimistic</H3> |
| <PRE> |
| public void <B>setOptimistic</B>(boolean optimistic)</PRE> |
| <DL> |
| <DD>Optimistic transactions do not hold data store locks until commit time. |
| If an implementation does not support this option, a |
| <code>JDOUnsupportedOptionException</code> is thrown. |
| <P> |
| <DD><DL> |
| <DT><B>Parameters:</B><DD><CODE>optimistic</CODE> - the value of the Optimistic flag.</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="getOptimistic()"><!-- --></A><H3> |
| getOptimistic</H3> |
| <PRE> |
| public boolean <B>getOptimistic</B>()</PRE> |
| <DL> |
| <DD>Optimistic transactions do not hold data store locks until commit time. |
| <P> |
| <DD><DL> |
| |
| <DT><B>Returns:</B><DD>the value of the Optimistic property.</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="setSynchronization(javax.transaction.Synchronization)"><!-- --></A><H3> |
| setSynchronization</H3> |
| <PRE> |
| public void <B>setSynchronization</B>(javax.transaction.Synchronization sync)</PRE> |
| <DL> |
| <DD>The user can specify a <code>Synchronization</code> instance to be notified on |
| transaction completions. The <code>beforeCompletion</code> method is called prior |
| to flushing instances to the data store. |
| |
| <P>The <code>afterCompletion</code> method is called after performing state |
| transitions of persistent and transactional instances, following |
| the data store commit or rollback operation. |
| <P>Only one <code>Synchronization</code> instance can be registered with the |
| <code>Transaction</code>. If the application requires more than one instance to |
| receive synchronization callbacks, then the single application instance |
| is responsible for managing them, and forwarding callbacks to them. |
| <P> |
| <DD><DL> |
| <DT><B>Parameters:</B><DD><CODE>sync</CODE> - the <code>Synchronization</code> instance to be notified; <code>null</code> for none</DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="getSynchronization()"><!-- --></A><H3> |
| getSynchronization</H3> |
| <PRE> |
| public javax.transaction.Synchronization <B>getSynchronization</B>()</PRE> |
| <DL> |
| <DD>The user-specified <code>Synchronization</code> instance for this <code>Transaction</code> instance. |
| <P> |
| <DD><DL> |
| |
| <DT><B>Returns:</B><DD>the user-specified <code>Synchronization</code> instance.</DL> |
| </DD> |
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| |
| <A NAME="getPersistenceManager()"><!-- --></A><H3> |
| getPersistenceManager</H3> |
| <PRE> |
| public <A HREF="../../javax/jdo/PersistenceManager.html" title="interface in javax.jdo">PersistenceManager</A> <B>getPersistenceManager</B>()</PRE> |
| <DL> |
| <DD>The <code>Transaction</code> instance is always associated with exactly one |
| <code>PersistenceManager</code>. |
| <P> |
| <DD><DL> |
| |
| <DT><B>Returns:</B><DD>the <code>PersistenceManager</code> for this <code>Transaction</code> instance</DL> |
| </DD> |
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