org.datanucleus.state

Class LockManagerImpl

java.lang.Object

org.datanucleus.state.LockManagerImpl

All Implemented Interfaces:

LockManager

public class LockManagerImpl
extends Object
implements LockManager

Implementation of a lock manager for objects.

Field Summary

Fields inherited from interface org.datanucleus.state.LockManager

LOCK_MODE_NONE, LOCK_MODE_OPTIMISTIC_READ, LOCK_MODE_OPTIMISTIC_WRITE, LOCK_MODE_PESSIMISTIC_READ, LOCK_MODE_PESSIMISTIC_WRITE

Constructor Summary

Constructors

Constructor and Description
LockManagerImpl()

Method Summary

Modifier and Type	Method and Description
void	clear() Method to clear all settings of required lock level for object ids (mode 2).
void	close() Method to close the manager and release resources.
short	getLockMode(Object id) Accessor for what locking should be applied to the object with the specified identity (mode 2).
short	getLockMode(ObjectProvider sm) Accessor for the current lock mode for the object managed by the passed ObjectProvider (mode 1).
void	lock(ObjectProvider sm, short lockMode) Method to lock the object managed by the passed ObjectProvider (mode 1).
void	lock(Object id, short lockMode) Method to lock the object with the provided identity (mode 2).
void	unlock(ObjectProvider sm) Method to unlock the object managed by the passed ObjectProvider (mode 1).

Methods inherited from class java.lang.Object

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

Constructor Detail

LockManagerImpl

public LockManagerImpl()

Method Detail

close

public void close()

Description copied from interface: LockManager

Method to close the manager and release resources.

Specified by:

close in interface LockManager

lock

public void lock(Object id,
                 short lockMode)

Description copied from interface: LockManager

Method to lock the object with the provided identity (mode 2).

Specified by:

lock in interface LockManager

Parameters:

id - Identity of the object

lockMode - mode for locking

getLockMode

public short getLockMode(Object id)

Description copied from interface: LockManager

Accessor for what locking should be applied to the object with the specified identity (mode 2).

Specified by:

getLockMode in interface LockManager

Parameters:

id - The identity

Returns:

The lock mode to apply (NONE if nothing defined)

clear

public void clear()

Description copied from interface: LockManager

Method to clear all settings of required lock level for object ids (mode 2).

Specified by:

clear in interface LockManager

lock

public void lock(ObjectProvider sm,
                 short lockMode)

Description copied from interface: LockManager

Method to lock the object managed by the passed ObjectProvider (mode 1).

Specified by:

lock in interface LockManager

Parameters:

sm - ObjectProvider for the object

lockMode - mode for locking

unlock

public void unlock(ObjectProvider sm)

Description copied from interface: LockManager

Method to unlock the object managed by the passed ObjectProvider (mode 1).

Specified by:

unlock in interface LockManager

Parameters:

sm - ObjectProvider for the object

getLockMode

public short getLockMode(ObjectProvider sm)

Description copied from interface: LockManager

Accessor for the current lock mode for the object managed by the passed ObjectProvider (mode 1).

Specified by:

getLockMode in interface LockManager

Parameters:

sm - ObjectProvider for the object

Returns:

The lock mode