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| org.apache.openjpa.kernel</FONT> |
| <BR> |
| Interface LockManager</H2> |
| <DL> |
| <DT><B>All Superinterfaces:</B> <DD><A HREF="../../../../org/apache/openjpa/lib/util/Closeable.html" title="interface in org.apache.openjpa.lib.util">Closeable</A>, <A HREF="../../../../org/apache/openjpa/kernel/LockLevels.html" title="interface in org.apache.openjpa.kernel">LockLevels</A></DD> |
| </DL> |
| <DL> |
| <DT><B>All Known Subinterfaces:</B> <DD><A HREF="../../../../org/apache/openjpa/jdbc/kernel/JDBCLockManager.html" title="interface in org.apache.openjpa.jdbc.kernel">JDBCLockManager</A></DD> |
| </DL> |
| <DL> |
| <DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../org/apache/openjpa/kernel/AbstractLockManager.html" title="class in org.apache.openjpa.kernel">AbstractLockManager</A>, <A HREF="../../../../org/apache/openjpa/kernel/NoneLockManager.html" title="class in org.apache.openjpa.kernel">NoneLockManager</A>, <A HREF="../../../../org/apache/openjpa/jdbc/kernel/PessimisticLockManager.html" title="class in org.apache.openjpa.jdbc.kernel">PessimisticLockManager</A>, <A HREF="../../../../org/apache/openjpa/kernel/VersionLockManager.html" title="class in org.apache.openjpa.kernel">VersionLockManager</A></DD> |
| </DL> |
| <HR> |
| <DL> |
| <DT><PRE>public interface <B>LockManager</B><DT>extends <A HREF="../../../../org/apache/openjpa/lib/util/Closeable.html" title="interface in org.apache.openjpa.lib.util">Closeable</A>, <A HREF="../../../../org/apache/openjpa/kernel/LockLevels.html" title="interface in org.apache.openjpa.kernel">LockLevels</A></DL> |
| </PRE> |
| |
| <P> |
| Handles obtaining and releasing locks on objects. The lock manager |
| generally does not have to worry about synchronization, as the context is |
| responsible for synchronizing the calls it makes to the lock manager. |
| <P> |
| |
| <P> |
| <DL> |
| <DT><B>Author:</B></DT> |
| <DD>Marc Prud'hommeaux</DD> |
| </DL> |
| <HR> |
| |
| <P> |
| <!-- =========== FIELD SUMMARY =========== --> |
| |
| <A NAME="field_summary"><!-- --></A> |
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| <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
| <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
| <B>Field Summary</B></FONT></TH> |
| </TR> |
| </TABLE> |
| <A NAME="fields_inherited_from_class_org.apache.openjpa.kernel.LockLevels"><!-- --></A> |
| <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
| <TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"> |
| <TH ALIGN="left"><B>Fields inherited from interface org.apache.openjpa.kernel.<A HREF="../../../../org/apache/openjpa/kernel/LockLevels.html" title="interface in org.apache.openjpa.kernel">LockLevels</A></B></TH> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD><CODE><A HREF="../../../../org/apache/openjpa/kernel/LockLevels.html#LOCK_NONE">LOCK_NONE</A>, <A HREF="../../../../org/apache/openjpa/kernel/LockLevels.html#LOCK_READ">LOCK_READ</A>, <A HREF="../../../../org/apache/openjpa/kernel/LockLevels.html#LOCK_WRITE">LOCK_WRITE</A></CODE></TD> |
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| <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
| <B>Method Summary</B></FONT></TH> |
| </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="../../../../org/apache/openjpa/kernel/LockManager.html#beginTransaction()">beginTransaction</A></B>()</CODE> |
| |
| <BR> |
| Notification that a transaction is beginning.</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="../../../../org/apache/openjpa/kernel/LockManager.html#close()">close</A></B>()</CODE> |
| |
| <BR> |
| Free any resources.</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="../../../../org/apache/openjpa/kernel/LockManager.html#endTransaction()">endTransaction</A></B>()</CODE> |
| |
| <BR> |
| Notification that the current transaction has ended.</TD> |
| </TR> |
| <TR BGCOLOR="white" CLASS="TableRowColor"> |
| <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
| <CODE> int</CODE></FONT></TD> |
| <TD><CODE><B><A HREF="../../../../org/apache/openjpa/kernel/LockManager.html#getLockLevel(org.apache.openjpa.kernel.OpenJPAStateManager)">getLockLevel</A></B>(<A HREF="../../../../org/apache/openjpa/kernel/OpenJPAStateManager.html" title="interface in org.apache.openjpa.kernel">OpenJPAStateManager</A> sm)</CODE> |
| |
| <BR> |
| Return the lock level of the specified instance, or |
| <A HREF="../../../../org/apache/openjpa/kernel/LockLevels.html#LOCK_NONE"><CODE>LockLevels.LOCK_NONE</CODE></A> if not locked.</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="../../../../org/apache/openjpa/kernel/LockManager.html#lock(org.apache.openjpa.kernel.OpenJPAStateManager, int, int, java.lang.Object)">lock</A></B>(<A HREF="../../../../org/apache/openjpa/kernel/OpenJPAStateManager.html" title="interface in org.apache.openjpa.kernel">OpenJPAStateManager</A> sm, |
| int level, |
| int timeout, |
| <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> sdata)</CODE> |
| |
| <BR> |
| Obtain a lock on the specified object.</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="../../../../org/apache/openjpa/kernel/LockManager.html#lockAll(java.util.Collection, int, int, java.lang.Object)">lockAll</A></B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A> sms, |
| int level, |
| int timeout, |
| <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> sdata)</CODE> |
| |
| <BR> |
| Obtain locks on the specified objects.</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="../../../../org/apache/openjpa/kernel/LockManager.html#release(org.apache.openjpa.kernel.OpenJPAStateManager)">release</A></B>(<A HREF="../../../../org/apache/openjpa/kernel/OpenJPAStateManager.html" title="interface in org.apache.openjpa.kernel">OpenJPAStateManager</A> sm)</CODE> |
| |
| <BR> |
| Release the lock on the given object.</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="../../../../org/apache/openjpa/kernel/LockManager.html#setContext(org.apache.openjpa.kernel.StoreContext)">setContext</A></B>(<A HREF="../../../../org/apache/openjpa/kernel/StoreContext.html" title="interface in org.apache.openjpa.kernel">StoreContext</A> ctx)</CODE> |
| |
| <BR> |
| Set the context this lock manager is associated with.</TD> |
| </TR> |
| </TABLE> |
| |
| <P> |
| |
| <!-- ============ METHOD DETAIL ========== --> |
| |
| <A NAME="method_detail"><!-- --></A> |
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| <B>Method Detail</B></FONT></TH> |
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| </TABLE> |
| |
| <A NAME="setContext(org.apache.openjpa.kernel.StoreContext)"><!-- --></A><H3> |
| setContext</H3> |
| <PRE> |
| void <B>setContext</B>(<A HREF="../../../../org/apache/openjpa/kernel/StoreContext.html" title="interface in org.apache.openjpa.kernel">StoreContext</A> ctx)</PRE> |
| <DL> |
| <DD>Set the context this lock manager is associated with. |
| This will be invoked in the lock manager before any other methods are |
| called. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="getLockLevel(org.apache.openjpa.kernel.OpenJPAStateManager)"><!-- --></A><H3> |
| getLockLevel</H3> |
| <PRE> |
| int <B>getLockLevel</B>(<A HREF="../../../../org/apache/openjpa/kernel/OpenJPAStateManager.html" title="interface in org.apache.openjpa.kernel">OpenJPAStateManager</A> sm)</PRE> |
| <DL> |
| <DD>Return the lock level of the specified instance, or |
| <A HREF="../../../../org/apache/openjpa/kernel/LockLevels.html#LOCK_NONE"><CODE>LockLevels.LOCK_NONE</CODE></A> if not locked. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="lock(org.apache.openjpa.kernel.OpenJPAStateManager, int, int, java.lang.Object)"><!-- --></A><H3> |
| lock</H3> |
| <PRE> |
| void <B>lock</B>(<A HREF="../../../../org/apache/openjpa/kernel/OpenJPAStateManager.html" title="interface in org.apache.openjpa.kernel">OpenJPAStateManager</A> sm, |
| int level, |
| int timeout, |
| <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> sdata)</PRE> |
| <DL> |
| <DD>Obtain a lock on the specified object. This method may be called when |
| a user explicitly locks an object, and is also called automatically |
| for every object accessed during a transaction. The implementation |
| must track already-locked objects, and must be optimized to return |
| quickly when the given object does not need additional locking. |
| The lock manager might use the state manager's lock object for |
| bookkeeping information. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| <DT><B>Parameters:</B><DD><CODE>sm</CODE> - the object to lock<DD><CODE>level</CODE> - one of the lock constants defined in <A HREF="../../../../org/apache/openjpa/kernel/LockLevels.html" title="interface in org.apache.openjpa.kernel"><CODE>LockLevels</CODE></A>, |
| or a custom level<DD><CODE>timeout</CODE> - the timeout in milliseconds, or a negative number for |
| no timeout<DD><CODE>sdata</CODE> - the context information passed from the store manager |
| to the persistence context, if any; lock managers |
| specific to a certain back end may be able to take |
| advantage of this; others should ignore it |
| <DT><B>Throws:</B> |
| <DD><CODE><A HREF="../../../../org/apache/openjpa/util/LockException.html" title="class in org.apache.openjpa.util">LockException</A></CODE> - if a lock cannot be |
| obtained in the given number of milliseconds<DT><B>See Also:</B><DD><A HREF="../../../../org/apache/openjpa/kernel/OpenJPAStateManager.html#setLock(java.lang.Object)"><CODE>OpenJPAStateManager.setLock(java.lang.Object)</CODE></A></DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="lockAll(java.util.Collection, int, int, java.lang.Object)"><!-- --></A><H3> |
| lockAll</H3> |
| <PRE> |
| void <B>lockAll</B>(<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A> sms, |
| int level, |
| int timeout, |
| <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> sdata)</PRE> |
| <DL> |
| <DD>Obtain locks on the specified objects. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| <DT><B>See Also:</B><DD><A HREF="../../../../org/apache/openjpa/kernel/LockManager.html#lock(org.apache.openjpa.kernel.OpenJPAStateManager, int, int, java.lang.Object)"><CODE>lock(org.apache.openjpa.kernel.OpenJPAStateManager, int, int, java.lang.Object)</CODE></A></DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="release(org.apache.openjpa.kernel.OpenJPAStateManager)"><!-- --></A><H3> |
| release</H3> |
| <PRE> |
| void <B>release</B>(<A HREF="../../../../org/apache/openjpa/kernel/OpenJPAStateManager.html" title="interface in org.apache.openjpa.kernel">OpenJPAStateManager</A> sm)</PRE> |
| <DL> |
| <DD>Release the lock on the given object. This method will be called |
| automatically for each state manager with a lock object set on |
| transaction completion, just before the call to <A HREF="../../../../org/apache/openjpa/kernel/LockManager.html#endTransaction()"><CODE>endTransaction()</CODE></A>. |
| The lock manager should null the state manager's lock object. Note |
| that some state manager may be garbage collected during a transaction; |
| thus lock managers cannot rely on this method being called for every |
| state manager. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| <DT><B>See Also:</B><DD><A HREF="../../../../org/apache/openjpa/kernel/OpenJPAStateManager.html#setLock(java.lang.Object)"><CODE>OpenJPAStateManager.setLock(java.lang.Object)</CODE></A></DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="beginTransaction()"><!-- --></A><H3> |
| beginTransaction</H3> |
| <PRE> |
| void <B>beginTransaction</B>()</PRE> |
| <DL> |
| <DD>Notification that a transaction is beginning. Locks are only obtained |
| within transactions, so an implementation might use this method to |
| initialize bookkeeping datastructures, etc. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="endTransaction()"><!-- --></A><H3> |
| endTransaction</H3> |
| <PRE> |
| void <B>endTransaction</B>()</PRE> |
| <DL> |
| <DD>Notification that the current transaction has ended. Clear all |
| datastructures, release any left over locks, etc. |
| <P> |
| <DD><DL> |
| </DL> |
| </DD> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
| <HR> |
| |
| <A NAME="close()"><!-- --></A><H3> |
| close</H3> |
| <PRE> |
| void <B>close</B>()</PRE> |
| <DL> |
| <DD>Free any resources. |
| <P> |
| <DD><DL> |
| <DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/apache/openjpa/lib/util/Closeable.html#close()">close</A></CODE> in interface <CODE><A HREF="../../../../org/apache/openjpa/lib/util/Closeable.html" title="interface in org.apache.openjpa.lib.util">Closeable</A></CODE></DL> |
| </DD> |
| <DD><DL> |
| </DL> |
| </DD> |
| </DL> |
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