Package org.hibernate.dialect.lock

Class SelectLockingStrategy

java.lang.Object

org.hibernate.dialect.lock.AbstractSelectLockingStrategy

org.hibernate.dialect.lock.SelectLockingStrategy

All Implemented Interfaces:

LockingStrategy

public class SelectLockingStrategy
extends AbstractSelectLockingStrategy

A locking strategy where a lock is obtained via a select statement.

For non-read locks, this is achieved through the dialect's native SELECT ... FOR UPDATE syntax.

Since:

3.2

See Also:

Dialect.getForUpdateString(LockMode), Dialect.appendLockHint(LockOptions, String)

Constructor Summary

Constructors

Constructor	Description
SelectLockingStrategy(Lockable lockable, LockMode lockMode)	Construct a locking strategy based on SQL SELECT statements.

Method Summary

Modifier and Type	Method	Description
protected String	generateLockString(int timeout)
void	lock(Object id, Object version, Object object, int timeout, EventSource 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 org.hibernate.dialect.lock.AbstractSelectLockingStrategy

determineSql, getLockable, getLockMode, getNoWaitSql, getSkipLockedSql

Methods inherited from class java.lang.Object

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

Constructor Detail

SelectLockingStrategy

public SelectLockingStrategy(Lockable lockable,
                             LockMode lockMode)

Construct a locking strategy based on SQL SELECT statements.

Parameters:

lockable - The metadata for the entity to be locked.

lockMode - Indicates the type of lock to be acquired.

Method Detail

lock

public void lock(Object id,
                 Object version,
                 Object object,
                 int timeout,
                 EventSource 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.

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 inability to locate the database row as part of acquiring the requested lock.

JDBCException

generateLockString

protected String generateLockString(int timeout)

Specified by:

generateLockString in class AbstractSelectLockingStrategy