org.apache.openjpa.jdbc.kernel
Interface JDBCLockManager

All Superinterfaces:

Closeable, LockLevels, LockManager

All Known Implementing Classes:

MixedLockManager, PessimisticLockManager

public interface JDBCLockManager
extends LockManager

Extension of the LockManager interface with methods for datastore locking during the select and load process. Implementors of this interface can also take advantage of the fact that in the LockManager.lock(org.apache.openjpa.kernel.OpenJPAStateManager, int, int, java.lang.Object) and LockManager.lockAll(java.util.Collection, int, int, java.lang.Object) methods, the given conn parameter, if any, will be an instance of ConnectionInfo.

Author:

Abe White

Field Summary

Fields inherited from interface org.apache.openjpa.kernel.LockLevels

LOCK_NONE, LOCK_READ, LOCK_WRITE

Method Summary

void	loadedForUpdate(OpenJPAStateManager sm) Notification that the given instance was loaded via a result set produced by a FOR UPDATE select.
boolean	selectForUpdate(Select sel, int lockLevel) Return whether to issue the given select FOR UPDATE, depending on the capabilities of the dictionary and the fetch configuration.
boolean	skipRelationFieldLock() Return true if locking is not desired for relation fields.

Methods inherited from interface org.apache.openjpa.kernel.LockManager

beginTransaction, close, endTransaction, getLockLevel, lock, lockAll, refreshLock, release, setContext

Method Detail

selectForUpdate

boolean selectForUpdate(Select sel,
                        int lockLevel)

Return whether to issue the given select FOR UPDATE, depending on the capabilities of the dictionary and the fetch configuration.

loadedForUpdate

void loadedForUpdate(OpenJPAStateManager sm)

Notification that the given instance was loaded via a result set produced by a FOR UPDATE select.

skipRelationFieldLock

boolean skipRelationFieldLock()

Return true if locking is not desired for relation fields.