PessimisticLockingPolicy (EclipseLink Core 3.0.4-RC1 API)

java.lang.Object
- org.eclipse.persistence.descriptors.PessimisticLockingPolicy

All Implemented Interfaces:

Serializable, Cloneable
```
public class PessimisticLockingPolicy
extends Object
implements Cloneable, Serializable
```
Description: This policy is used to configure bean level pessimistic locking feature. It is set on the CMPPolicy instance of the ClassDescriptor Note that bean is not pessimistic locked in the following scenarios:
- No presence of a JTA transaction
- The current transaction is created and started by the Container for the invoking entity bean's method only. (i.e. invoke a business method without a client transaction)
- The bean has already been pessimistic locked in the current transaction
- Execution of ejbSelect
- Traversing relationship does not lock the returned result.
Responsibilities:
- Configure locking modes of WAIT or NO_WAIT
- Provide utility to configure an ObjectLevelReadQuery with pessimistic locking based on this policy.
Since:

TopLink 10.1.3

See Also:

CMPPolicy, Serialized Form

Field Summary

Fields
Modifier and Type Field Description

protected short lockingMode

Constructor Summary

Constructors
Constructor Description

PessimisticLockingPolicy()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Object`	`clone()`	INTERNAL: Clone the policy
`short`	`getLockingMode()`	PUBLIC: Return locking mode.
`void`	`setLockingMode(short mode)`	PUBLIC: Set locking mode.

Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - lockingMode
```
protected short lockingMode
```
- Constructor Detail
  - PessimisticLockingPolicy
```
public PessimisticLockingPolicy()
```
- Method Detail
  - getLockingMode
```
public short getLockingMode()
```
    PUBLIC: Return locking mode. Default locking mode is ObjectLevelReadQuery.LOCK.
    
    Returns:
    
    short locking mode value of ObjectLevelReadQuery.LOCK or ObjectLevelReadQuery.LOCK_NOWAIT
  - setLockingMode
```
public void setLockingMode(short mode)
```
    PUBLIC: Set locking mode. If the mode is not a valid value, the locking mode is unchanged.
    
    Parameters:
    
    mode - must be value of ObjectLevelReadQuery.LOCK or ObjectLevelReadQuery.LOCK_NOWAIT
  - clone
```
public Object clone()
```
    INTERNAL: Clone the policy
    
    Overrides:
    
    clone in class Object