public MapPessimisticWriteLockingStrategy(Lockable lockable, LockMode lockMode) {
this.lockable = lockable;
this.lockMode = lockMode;
TypeTranslator typeTranslator =
lockable.getFactory().getServiceRegistry().getService(TypeTranslator.class);
this.identifierGridType = typeTranslator.getType(lockable.getIdentifierType());
}
/**
* Construct a locking strategy based on SQL UPDATE statements.
*
* @param lockable The metadata for the entity to be locked.
* @param lockMode Indictates the type of lock to be acquired. Note that read-locks are not valid
* for this strategy.
*/
public UpdateLockingStrategy(Lockable lockable, LockMode lockMode) {
this.lockable = lockable;
this.lockMode = lockMode;
if (lockMode.lessThan(LockMode.UPGRADE)) {
throw new HibernateException("[" + lockMode + "] not valid for update statement");
}
if (!lockable.isVersioned()) {
log.warn(
"write locks via update not supported for non-versioned entities ["
+ lockable.getEntityName()
+ "]");
this.sql = null;
} else {
this.sql = generateLockString();
}
}
/**
* Construct locking strategy.
*
* @param lockable The metadata for the entity to be locked.
* @param lockMode Indicates the type of lock to be acquired.
*/
public OptimisticForceIncrementLockingStrategy(Lockable lockable, LockMode lockMode) {
this.lockable = lockable;
this.lockMode = lockMode;
if (lockMode.lessThan(LockMode.OPTIMISTIC_FORCE_INCREMENT)) {
throw new HibernateException(
"[" + lockMode + "] not valid for [" + lockable.getEntityName() + "]");
}
}
@Override
public void lock(
Serializable id,
Object version,
Object object,
int timeout,
SharedSessionContractImplementor session) {
if (!lockable.isVersioned()) {
throw new HibernateException(
"["
+ lockMode
+ "] not supported for non-versioned entities ["
+ lockable.getEntityName()
+ "]");
}
final EntityEntry entry = session.getPersistenceContext().getEntry(object);
// Register the EntityIncrementVersionProcess action to run just prior to transaction commit.
((EventSource) session)
.getActionQueue()
.registerProcess(new EntityIncrementVersionProcess(object, entry));
}
/** @see LockingStrategy#lock */
public void lock(
Serializable id, Object version, Object object, int timeout, SessionImplementor session)
throws StaleObjectStateException, JDBCException {
if (!lockable.isVersioned()) {
throw new HibernateException(
"write locks via update not supported for non-versioned entities ["
+ lockable.getEntityName()
+ "]");
}
// todo : should we additionally check the current isolation mode explicitly?
SessionFactoryImplementor factory = session.getFactory();
try {
PreparedStatement st = session.getBatcher().prepareSelectStatement(sql);
try {
lockable.getVersionType().nullSafeSet(st, version, 1, session);
int offset = 2;
lockable.getIdentifierType().nullSafeSet(st, id, offset, session);
offset += lockable.getIdentifierType().getColumnSpan(factory);
if (lockable.isVersioned()) {
lockable.getVersionType().nullSafeSet(st, version, offset, session);
}
int affected = st.executeUpdate();
if (affected < 0) {
factory.getStatisticsImplementor().optimisticFailure(lockable.getEntityName());
throw new StaleObjectStateException(lockable.getEntityName(), id);
}
} finally {
session.getBatcher().closeStatement(st);
}
} catch (SQLException sqle) {
throw session
.getFactory()
.getSQLExceptionHelper()
.convert(
sqle,
"could not lock: " + MessageHelper.infoString(lockable, id, session.getFactory()),
sql);
}
}
protected String generateLockString() {
SessionFactoryImplementor factory = lockable.getFactory();
Update update = new Update(factory.getDialect());
update.setTableName(lockable.getRootTableName());
update.addPrimaryKeyColumns(lockable.getRootTableIdentifierColumnNames());
update.setVersionColumnName(lockable.getVersionColumnName());
update.addColumn(lockable.getVersionColumnName());
if (factory.getSettings().isCommentsEnabled()) {
update.setComment(lockMode + " lock " + lockable.getEntityName());
}
return update.toStatementString();
}
protected String generateLockString() {
SessionFactoryImplementor factory = lockable.getFactory();
SimpleSelect select =
new SimpleSelect(factory.getDialect())
.setLockMode(lockMode)
.setTableName(lockable.getRootTableName())
.addColumn(lockable.getRootTableIdentifierColumnNames()[0])
.addCondition(lockable.getRootTableIdentifierColumnNames(), "=?");
if (lockable.isVersioned()) {
select.addCondition(lockable.getVersionColumnName(), "=?");
}
if (factory.getSettings().isCommentsEnabled()) {
select.setComment(lockMode + " lock " + lockable.getEntityName());
}
return select.toStatementString();
}
/** @see LockingStrategy#lock */
public void lock(Serializable id, Object version, Object object, SessionImplementor session)
throws StaleObjectStateException, JDBCException {
SessionFactoryImplementor factory = session.getFactory();
try {
PreparedStatement st = session.getBatcher().prepareSelectStatement(sql);
try {
lockable.getIdentifierType().nullSafeSet(st, id, 1, session);
if (lockable.isVersioned()) {
lockable
.getVersionType()
.nullSafeSet(
st, version, lockable.getIdentifierType().getColumnSpan(factory) + 1, session);
}
ResultSet rs = st.executeQuery();
try {
if (!rs.next()) {
if (factory.getStatistics().isStatisticsEnabled()) {
factory.getStatisticsImplementor().optimisticFailure(lockable.getEntityName());
}
throw new StaleObjectStateException(lockable.getEntityName(), id);
}
} finally {
rs.close();
}
} finally {
session.getBatcher().closeStatement(st);
}
} catch (SQLException sqle) {
throw JDBCExceptionHelper.convert(
session.getFactory().getSQLExceptionConverter(),
sqle,
"could not lock: " + MessageHelper.infoString(lockable, id, session.getFactory()),
sql);
}
}
