org.apache.openjpa.jdbc.kernel

Class MixedLockManager

java.lang.Object

org.apache.openjpa.kernel.AbstractLockManager

org.apache.openjpa.kernel.VersionLockManager

org.apache.openjpa.jdbc.kernel.PessimisticLockManager

org.apache.openjpa.jdbc.kernel.MixedLockManager

All Implemented Interfaces:

JDBCLockManager, LockLevels, LockManager, Closeable

public class MixedLockManager
extends PessimisticLockManager

Mixed lock manager implements both optimistic and pessimistic locking semantics in parallel to the JPA 2.0 specification.

Since:

2.0.0

Author:

Albert Lee

Field Summary

Fields inherited from class org.apache.openjpa.jdbc.kernel.PessimisticLockManager

_store, LOCK_DATASTORE_ONLY

Fields inherited from class org.apache.openjpa.kernel.AbstractLockManager

ctx, log

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

LOCK_NONE, LOCK_READ, LOCK_WRITE

Constructor Summary

Constructors

Constructor and Description
MixedLockManager()

Method Summary

Methods

Modifier and Type	Method and Description
protected List<SQLBuffer>	getLockRows(DBDictionary dict, Object id, ClassMapping mapping, JDBCFetchConfiguration fetch, SQLFactory factory)
protected void	lockInternal(OpenJPAStateManager sm, int level, int timeout, Object sdata, boolean postLockVersionCheck) Marks the instance's transactional status in accordance with the settings of VersionLockManager.getVersionCheckOnReadLock() and VersionLockManager.getVersionUpdateOnWriteLock().
protected void	optimisticLockInternal(OpenJPAStateManager sm, int level, int timeout, Object sdata, boolean postLockVersionCheck)
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() Default not to skip relation field to maintain PessimisticLockManager semantics.

Methods inherited from class org.apache.openjpa.jdbc.kernel.PessimisticLockManager

checkLock, executeQuery, getStore, loadedForUpdate, lockJoinTables, prepareStatement, setContext

Methods inherited from class org.apache.openjpa.kernel.VersionLockManager

getLockLevel, getVersionCheckOnReadLock, getVersionUpdateOnWriteLock, lock, refreshLock, release, setLockLevel, setVersionCheckOnReadLock, setVersionUpdateOnWriteLock

Methods inherited from class org.apache.openjpa.kernel.AbstractLockManager

beginTransaction, close, endTransaction, getContext, lockAll

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

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

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

Constructor Detail

MixedLockManager

public MixedLockManager()

Method Detail

selectForUpdate

public boolean selectForUpdate(Select sel,
                      int lockLevel)

Description copied from interface: JDBCLockManager

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

Specified by:

selectForUpdate in interface JDBCLockManager

Overrides:

selectForUpdate in class PessimisticLockManager

lockInternal

protected void lockInternal(OpenJPAStateManager sm,
                int level,
                int timeout,
                Object sdata,
                boolean postLockVersionCheck)

Description copied from class: VersionLockManager

Marks the instance's transactional status in accordance with the settings of VersionLockManager.getVersionCheckOnReadLock() and VersionLockManager.getVersionUpdateOnWriteLock(). Override to perform additional locking.

Overrides:

lockInternal in class PessimisticLockManager

See Also:

StoreContext.transactional(java.lang.Object, boolean, org.apache.openjpa.kernel.OpCallbacks)

getLockRows

protected List<SQLBuffer> getLockRows(DBDictionary dict,
                          Object id,
                          ClassMapping mapping,
                          JDBCFetchConfiguration fetch,
                          SQLFactory factory)

Overrides:

getLockRows in class PessimisticLockManager

optimisticLockInternal

protected void optimisticLockInternal(OpenJPAStateManager sm,
                          int level,
                          int timeout,
                          Object sdata,
                          boolean postLockVersionCheck)

Overrides:

optimisticLockInternal in class VersionLockManager

skipRelationFieldLock

public boolean skipRelationFieldLock()

Description copied from class: AbstractLockManager

Default not to skip relation field to maintain PessimisticLockManager semantics.

Specified by:

skipRelationFieldLock in interface JDBCLockManager

Overrides:

skipRelationFieldLock in class AbstractLockManager