org.apache.openjpa.kernel
Class NoneLockManager
java.lang.Object
org.apache.openjpa.kernel.AbstractLockManager
org.apache.openjpa.kernel.NoneLockManager
- All Implemented Interfaces:
- LockLevels, LockManager, Closeable
public class NoneLockManager
- extends AbstractLockManager
A lock manager that does not perform any locking.
- Author:
- Marc Prud'hommeaux
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
NoneLockManager
public NoneLockManager()
lock
public void lock(OpenJPAStateManager sm,
int level,
int timeout,
Object context)
- Description copied from interface:
LockManager
- 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.
- Parameters:
sm
- the object to locklevel
- one of the lock constants defined in LockLevels
,
or a custom leveltimeout
- the timeout in milliseconds, or a negative number for
no timeoutcontext
- 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- See Also:
OpenJPAStateManager.setLock(java.lang.Object)
refreshLock
public void refreshLock(OpenJPAStateManager sm,
int level,
int timeout,
Object context)
- Description copied from interface:
LockManager
- Perform the same function as previous lock method and has the option
to perform a version check after the lock function has completed.
release
public void release(OpenJPAStateManager sm)
- Description copied from interface:
LockManager
- 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
LockManager.endTransaction()
.
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.
- See Also:
OpenJPAStateManager.setLock(java.lang.Object)
getLockLevel
public int getLockLevel(OpenJPAStateManager sm)
- Description copied from interface:
LockManager
- Return the lock level of the specified instance, or
LockLevels.LOCK_NONE
if not locked.
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