org.hibernate.dialect.lock
Class PessimisticReadUpdateLockingStrategy

java.lang.Object
  org.hibernate.dialect.lock.PessimisticReadUpdateLockingStrategy

All Implemented Interfaces:

LockingStrategy

public class PessimisticReadUpdateLockingStrategy
extends Object
implements LockingStrategy

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

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

Since:

3.5

Author:

Steve Ebersole, Scott Marlow

Constructor Summary

PessimisticReadUpdateLockingStrategy(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

PessimisticReadUpdateLockingStrategy

public PessimisticReadUpdateLockingStrategy(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()