/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
 */
package org.hibernate.dialect.lock;

import java.io.Serializable;

import org.hibernate.StaleObjectStateException;
import org.hibernate.engine.spi.SharedSessionContractImplementor;

A strategy abstraction for how locks are obtained in the underlying database.

All locking provided implementations assume the underlying database supports (and that the connection is in) at least read-committed transaction isolation. The most glaring exclusion to this is HSQLDB which only offers support for READ_UNCOMMITTED isolation.
Author:Steve Ebersole
See Also:
  • getLockingStrategy.getLockingStrategy
Since:3.2
/** * A strategy abstraction for how locks are obtained in the underlying database. * <p/> * All locking provided implementations assume the underlying database supports * (and that the connection is in) at least read-committed transaction isolation. * The most glaring exclusion to this is HSQLDB which only offers support for * READ_UNCOMMITTED isolation. * * @see org.hibernate.dialect.Dialect#getLockingStrategy * @since 3.2 * * @author Steve Ebersole */
public interface LockingStrategy {
Acquire an appropriate type of lock on the underlying data that will endure until the end of the current transaction.
Params:
  • 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:
/** * Acquire an appropriate type of lock on the underlying data that will * endure until the end of the current transaction. * * @param id The id of the row to be locked * @param version The current version (or null if not versioned) * @param object The object logically being locked (currently not used) * @param timeout timeout in milliseconds, 0 = no wait, -1 = wait indefinitely * @param 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. * @throws LockingStrategyException Indicates a failure in the lock attempt */
void lock(Serializable id, Object version, Object object, int timeout, SharedSessionContractImplementor session) throws StaleObjectStateException, LockingStrategyException; }