org.hibernate.dialect.lock
Class PessimisticWriteUpdateLockingStrategy

java.lang.Object
  extended by org.hibernate.dialect.lock.PessimisticWriteUpdateLockingStrategy
All Implemented Interfaces:
LockingStrategy

public class PessimisticWriteUpdateLockingStrategy
extends Object
implements LockingStrategy

A pessimistic locking strategy where the locks are obtained through update statements.

This strategy is valid for LockMode.PESSIMISTIC_WRITE This class is a clone of UpdateLockingStrategy.

Since:
3.5
Author:
Steve Ebersole, Scott Marlow

Constructor Summary
PessimisticWriteUpdateLockingStrategy(Lockable lockable, LockMode lockMode)
          Construct a locking strategy based on SQL UPDATE statements.
 
Method Summary
protected  String generateLockString()
           
protected  LockMode getLockMode()
           
 void lock(Serializable id, Object version, Object object, int timeout, SessionImplementor session)
          Acquire an appropriate type of lock on the underlying data that will endure until the end of the current transaction.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

PessimisticWriteUpdateLockingStrategy

public PessimisticWriteUpdateLockingStrategy(Lockable lockable,
                                             LockMode lockMode)
Construct a locking strategy based on SQL UPDATE statements.

Parameters:
lockable - The metadata for the entity to be locked.
lockMode - Indictates the type of lock to be acquired. Note that read-locks are not valid for this strategy.
Method Detail

lock

public void lock(Serializable id,
                 Object version,
                 Object object,
                 int timeout,
                 SessionImplementor session)
          throws StaleObjectStateException,
                 JDBCException
Description copied from interface: LockingStrategy
Acquire an appropriate type of lock on the underlying data that will endure until the end of the current transaction.

Specified by:
lock in interface LockingStrategy
Parameters:
id - The id of the row to be locked
version - The current version (or null if not versioned)
object - The object logically being locked (currently not used)
timeout - timeout in milliseconds, 0 = no wait, -1 = wait indefinitely
session - The session from which the lock request originated
Throws:
StaleObjectStateException - Indicates an optimistic lock failure as part of acquiring the requested database lock.
JDBCException - Indicates errors from the JDBC driver.
See Also:
LockingStrategy.lock(java.io.Serializable, java.lang.Object, java.lang.Object, int, org.hibernate.engine.SessionImplementor)

generateLockString

protected String generateLockString()

getLockMode

protected LockMode getLockMode()


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