Java Code Examples for org.hibernate.LockMode#greaterThan()

@Override
public LockingStrategy getLockingStrategy(Lockable lockable, LockMode lockMode) {
	// InterSystems Cache' does not current support "SELECT ... FOR UPDATE" syntax...
	// Set your transaction mode to READ_COMMITTED before using
	if ( lockMode==LockMode.PESSIMISTIC_FORCE_INCREMENT) {
		return new PessimisticForceIncrementLockingStrategy( lockable, lockMode);
	}
	else if ( lockMode==LockMode.PESSIMISTIC_WRITE) {
		return new PessimisticWriteUpdateLockingStrategy( lockable, lockMode);
	}
	else if ( lockMode==LockMode.PESSIMISTIC_READ) {
		return new PessimisticReadUpdateLockingStrategy( lockable, lockMode);
	}
	else if ( lockMode==LockMode.OPTIMISTIC) {
		return new OptimisticLockingStrategy( lockable, lockMode);
	}
	else if ( lockMode==LockMode.OPTIMISTIC_FORCE_INCREMENT) {
		return new OptimisticForceIncrementLockingStrategy( lockable, lockMode);
	}
	else if ( lockMode.greaterThan( LockMode.READ ) ) {
		return new UpdateLockingStrategy( lockable, lockMode );
	}
	else {
		return new SelectLockingStrategy( lockable, lockMode );
	}
}
 

@Override
public LockingStrategy getLockingStrategy(Lockable lockable, LockMode lockMode) {
	// TimesTen has no known variation of a "SELECT ... FOR UPDATE" syntax...
	if ( lockMode == LockMode.PESSIMISTIC_FORCE_INCREMENT ) {
		return new PessimisticForceIncrementLockingStrategy( lockable, lockMode );
	}
	else if ( lockMode == LockMode.PESSIMISTIC_WRITE ) {
		return new PessimisticWriteUpdateLockingStrategy( lockable, lockMode );
	}
	else if ( lockMode == LockMode.PESSIMISTIC_READ ) {
		return new PessimisticReadUpdateLockingStrategy( lockable, lockMode );
	}
	else if ( lockMode == LockMode.OPTIMISTIC ) {
		return new OptimisticLockingStrategy( lockable, lockMode );
	}
	else if ( lockMode == LockMode.OPTIMISTIC_FORCE_INCREMENT ) {
		return new OptimisticForceIncrementLockingStrategy( lockable, lockMode );
	}
	else if ( lockMode.greaterThan( LockMode.READ ) ) {
		return new UpdateLockingStrategy( lockable, lockMode );
	}
	else {
		return new SelectLockingStrategy( lockable, lockMode );
	}
}
 

@Override
public LockingStrategy getLockingStrategy(Lockable lockable, LockMode lockMode) {
	// Pointbase has no known variation of a "SELECT ... FOR UPDATE" syntax...
	if ( lockMode==LockMode.PESSIMISTIC_FORCE_INCREMENT) {
		return new PessimisticForceIncrementLockingStrategy( lockable, lockMode);
	}
	else if ( lockMode==LockMode.PESSIMISTIC_WRITE) {
		return new PessimisticWriteUpdateLockingStrategy( lockable, lockMode);
	}
	else if ( lockMode==LockMode.PESSIMISTIC_READ) {
		return new PessimisticReadUpdateLockingStrategy( lockable, lockMode);
	}
	else if ( lockMode==LockMode.OPTIMISTIC) {
		return new OptimisticLockingStrategy( lockable, lockMode);
	}
	else if ( lockMode==LockMode.OPTIMISTIC_FORCE_INCREMENT) {
		return new OptimisticForceIncrementLockingStrategy( lockable, lockMode);
	}
	else if ( lockMode.greaterThan( LockMode.READ ) ) {
		return new UpdateLockingStrategy( lockable, lockMode );
	}
	else {
		return new SelectLockingStrategy( lockable, lockMode );
	}
}
 

@Override
public LockingStrategy getLockingStrategy(Lockable lockable, LockMode lockMode) {
	// RDMS has no known variation of a "SELECT ... FOR UPDATE" syntax...
	if ( lockMode == LockMode.PESSIMISTIC_FORCE_INCREMENT ) {
		return new PessimisticForceIncrementLockingStrategy( lockable, lockMode );
	}
	else if ( lockMode == LockMode.PESSIMISTIC_WRITE ) {
		return new PessimisticWriteUpdateLockingStrategy( lockable, lockMode );
	}
	else if ( lockMode == LockMode.PESSIMISTIC_READ ) {
		return new PessimisticReadUpdateLockingStrategy( lockable, lockMode );
	}
	else if ( lockMode == LockMode.OPTIMISTIC ) {
		return new OptimisticLockingStrategy( lockable, lockMode );
	}
	else if ( lockMode == LockMode.OPTIMISTIC_FORCE_INCREMENT ) {
		return new OptimisticForceIncrementLockingStrategy( lockable, lockMode );
	}
	else if ( lockMode.greaterThan( LockMode.READ ) ) {
		return new UpdateLockingStrategy( lockable, lockMode );
	}
	else {
		return new SelectLockingStrategy( lockable, lockMode );
	}
}
 

@Override
public LockingStrategy getLockingStrategy(Lockable lockable, LockMode lockMode) {
	// Mckoi has no known variation of a "SELECT ... FOR UPDATE" syntax...
	if ( lockMode==LockMode.PESSIMISTIC_FORCE_INCREMENT) {
		return new PessimisticForceIncrementLockingStrategy( lockable, lockMode);
	}
	else if ( lockMode==LockMode.PESSIMISTIC_WRITE) {
		return new PessimisticWriteUpdateLockingStrategy( lockable, lockMode);
	}
	else if ( lockMode==LockMode.PESSIMISTIC_READ) {
		return new PessimisticReadUpdateLockingStrategy( lockable, lockMode);
	}
	else if ( lockMode==LockMode.OPTIMISTIC) {
		return new OptimisticLockingStrategy( lockable, lockMode);
	}
	else if ( lockMode==LockMode.OPTIMISTIC_FORCE_INCREMENT) {
		return new OptimisticForceIncrementLockingStrategy( lockable, lockMode);
	}
	else if ( lockMode.greaterThan( LockMode.READ ) ) {
		return new UpdateLockingStrategy( lockable, lockMode );
	}
	else {
		return new SelectLockingStrategy( lockable, lockMode );
	}
}
 

/**
 * Get the <tt>FOR UPDATE OF column_list</tt> fragment appropriate for this
 * dialect given the aliases of the columns to be write locked.
 *
 * @param aliases The columns to be write locked.
 * @param lockOptions the lock options to apply
 * @return The appropriate <tt>FOR UPDATE OF column_list</tt> clause string.
 */
@SuppressWarnings({"unchecked", "UnusedParameters"})
public String getForUpdateString(String aliases, LockOptions lockOptions) {
	LockMode lockMode = lockOptions.getLockMode();
	final Iterator<Map.Entry<String, LockMode>> itr = lockOptions.getAliasLockIterator();
	while ( itr.hasNext() ) {
		// seek the highest lock mode
		final Map.Entry<String, LockMode>entry = itr.next();
		final LockMode lm = entry.getValue();
		if ( lm.greaterThan( lockMode ) ) {
			lockMode = lm;
		}
	}
	lockOptions.setLockMode( lockMode );
	return getForUpdateString( lockOptions );
}
 

@Override
public LockingStrategy getLockingStrategy(Lockable lockable, LockMode lockMode) {
	// Frontbase has no known variation of a "SELECT ... FOR UPDATE" syntax...
	if ( lockMode==LockMode.PESSIMISTIC_FORCE_INCREMENT) {
		return new PessimisticForceIncrementLockingStrategy( lockable, lockMode);
	}
	else if ( lockMode==LockMode.PESSIMISTIC_WRITE) {
		return new PessimisticWriteUpdateLockingStrategy( lockable, lockMode);
	}
	else if ( lockMode==LockMode.PESSIMISTIC_READ) {
		return new PessimisticReadUpdateLockingStrategy( lockable, lockMode);
	}
	else if ( lockMode==LockMode.OPTIMISTIC) {
		return new OptimisticLockingStrategy( lockable, lockMode);
	}
	else if ( lockMode==LockMode.OPTIMISTIC_FORCE_INCREMENT) {
		return new OptimisticForceIncrementLockingStrategy( lockable, lockMode);
	}
	else if ( lockMode.greaterThan( LockMode.READ ) ) {
		return new UpdateLockingStrategy( lockable, lockMode );
	}
	else {
		return new SelectLockingStrategy( lockable, lockMode );
	}
}
 

@Override
public String applyLocksToSql(String sql, LockOptions aliasedLockOptions, Map<String, String[]> keyColumnNames) {
	// TODO:  merge additional lockoptions support in Dialect.applyLocksToSql
	final Iterator itr = aliasedLockOptions.getAliasLockIterator();
	final StringBuilder buffer = new StringBuilder( sql );

	while ( itr.hasNext() ) {
		final Map.Entry entry = (Map.Entry) itr.next();
		final LockMode lockMode = (LockMode) entry.getValue();
		if ( lockMode.greaterThan( LockMode.READ ) ) {
			final String alias = (String) entry.getKey();
			int start = -1;
			int end = -1;
			if ( sql.endsWith( " " + alias ) ) {
				start = ( buffer.length() - alias.length() );
				end = start + alias.length();
			}
			else {
				int position = buffer.indexOf( " " + alias + " " );
				if ( position <= -1 ) {
					position = buffer.indexOf( " " + alias + "," );
				}
				if ( position > -1 ) {
					start = position + 1;
					end = start + alias.length();
				}
			}

			if ( start > -1 ) {
				final String lockHint = appendLockHint( aliasedLockOptions, alias );
				buffer.replace( start, end, lockHint );
			}
		}
	}
	return buffer.toString();
}
 

public LockingStrategy getLockingStrategy(Lockable lockable, LockMode lockMode) {
	// Frontbase has no known variation of a "SELECT ... FOR UPDATE" syntax...
	if ( lockMode.greaterThan( LockMode.READ ) ) {
		return new UpdateLockingStrategy( lockable, lockMode );
	}
	else {
		return new SelectLockingStrategy( lockable, lockMode );
	}
}
 

public LockingStrategy getLockingStrategy(Lockable lockable, LockMode lockMode) {
	// Mckoi has no known variation of a "SELECT ... FOR UPDATE" syntax...
	if ( lockMode.greaterThan( LockMode.READ ) ) {
		return new UpdateLockingStrategy( lockable, lockMode );
	}
	else {
		return new SelectLockingStrategy( lockable, lockMode );
	}
}
 

public LockingStrategy getLockingStrategy(Lockable lockable, LockMode lockMode) {
	// RDMS has no known variation of a "SELECT ... FOR UPDATE" syntax...
	if ( lockMode.greaterThan( LockMode.READ ) ) {
		return new UpdateLockingStrategy( lockable, lockMode );
	}
	else {
		return new SelectLockingStrategy( lockable, lockMode );
	}
}
 

public String appendLockHint(LockMode mode, String tableName) {
	if ( mode.greaterThan( LockMode.READ ) ) {
		// does this need holdlock also? : return tableName + " with (updlock, rowlock, holdlock)";
		return tableName + " with (updlock, rowlock)";
	}
	else {
		return tableName;
	}
}
 

public LockingStrategy getLockingStrategy(Lockable lockable, LockMode lockMode) {
	// Pointbase has no known variation of a "SELECT ... FOR UPDATE" syntax...
	if ( lockMode.greaterThan( LockMode.READ ) ) {
		return new UpdateLockingStrategy( lockable, lockMode );
	}
	else {
		return new SelectLockingStrategy( lockable, lockMode );
	}
}
 

public LockingStrategy getLockingStrategy(Lockable lockable, LockMode lockMode) {
	// TimesTen has no known variation of a "SELECT ... FOR UPDATE" syntax...
	if ( lockMode.greaterThan( LockMode.READ ) ) {
		return new UpdateLockingStrategy( lockable, lockMode );
	}
	else {
		return new SelectLockingStrategy( lockable, lockMode );
	}
}
 

public String applyLocksToSql(String sql, Map aliasedLockModes, Map keyColumnNames) {
	Iterator itr = aliasedLockModes.entrySet().iterator();
	StringBuffer buffer = new StringBuffer( sql );
	int correction = 0;
	while ( itr.hasNext() ) {
		final Map.Entry entry = ( Map.Entry ) itr.next();
		final LockMode lockMode = ( LockMode ) entry.getValue();
		if ( lockMode.greaterThan( LockMode.READ ) ) {
			final String alias = ( String ) entry.getKey();
			int start = -1, end = -1;
			if ( sql.endsWith( " " + alias ) ) {
				start = ( sql.length() - alias.length() ) + correction;
				end = start + alias.length();
			}
			else {
				int position = sql.indexOf( " " + alias + " " );
				if ( position <= -1 ) {
					position = sql.indexOf( " " + alias + "," );
				}
				if ( position > -1 ) {
					start = position + correction + 1;
					end = start + alias.length();
				}
			}

			if ( start > -1 ) {
				final String lockHint = appendLockHint( lockMode, alias );
				buffer.replace( start, end, lockHint );
				correction += ( lockHint.length() - alias.length() );
			}
		}
	}
	return buffer.toString();
}
 

public String appendLockHint(LockMode mode, String tableName) {
	if ( mode.greaterThan( LockMode.READ ) ) {
		return tableName + " holdlock";
	}
	else {
		return tableName;
	}
}
 

public LockingStrategy getLockingStrategy(Lockable lockable, LockMode lockMode) {
	// InterSystems Cache' does not current support "SELECT ... FOR UPDATE" syntax...
	// Set your transaction mode to READ_COMMITTED before using
	if ( lockMode.greaterThan( LockMode.READ ) ) {
		return new UpdateLockingStrategy( lockable, lockMode );
	}
	else {
		return new SelectLockingStrategy( lockable, lockMode );
	}
}
 

/**
 * Performs a pessimistic lock upgrade on a given entity, if needed.
 *
 * @param object The entity for which to upgrade the lock.
 * @param entry The entity's EntityEntry instance.
 * @param lockOptions contains the requested lock mode.
 * @param source The session which is the source of the event being processed.
 */
protected void upgradeLock(Object object, EntityEntry entry, LockOptions lockOptions, EventSource source) {

	LockMode requestedLockMode = lockOptions.getLockMode();
	if ( requestedLockMode.greaterThan( entry.getLockMode() ) ) {
		// The user requested a "greater" (i.e. more restrictive) form of
		// pessimistic lock

		if ( entry.getStatus() != Status.MANAGED ) {
			throw new ObjectDeletedException(
					"attempted to lock a deleted instance",
					entry.getId(),
					entry.getPersister().getEntityName()
			);
		}

		final EntityPersister persister = entry.getPersister();

		if ( log.isTraceEnabled() ) {
			log.tracev(
					"Locking {0} in mode: {1}",
					MessageHelper.infoString( persister, entry.getId(), source.getFactory() ),
					requestedLockMode
			);
		}

		final boolean cachingEnabled = persister.canWriteToCache();
		SoftLock lock = null;
		Object ck = null;
		try {
			if ( cachingEnabled ) {
				EntityDataAccess cache = persister.getCacheAccessStrategy();
				ck = cache.generateCacheKey( entry.getId(), persister, source.getFactory(), source.getTenantIdentifier() );
				lock = cache.lockItem( source, ck, entry.getVersion() );
			}

			if ( persister.isVersioned() && requestedLockMode == LockMode.FORCE  ) {
				// todo : should we check the current isolation mode explicitly?
				Object nextVersion = persister.forceVersionIncrement(
						entry.getId(), entry.getVersion(), source
				);
				entry.forceLocked( object, nextVersion );
			}
			else {
				persister.lock( entry.getId(), entry.getVersion(), object, lockOptions, source );
			}
			entry.setLockMode(requestedLockMode);
		}
		finally {
			// the database now holds a lock + the object is flushed from the cache,
			// so release the soft lock
			if ( cachingEnabled ) {
				persister.getCacheAccessStrategy().unlockItem( source, ck, lock );
			}
		}

	}
}
 

/**
 * Performs a pessimistic lock upgrade on a given entity, if needed.
 *
 * @param object The entity for which to upgrade the lock.
 * @param entry The entity's EntityEntry instance.
 * @param lockOptions contains the requested lock mode.
 * @param source The session which is the source of the event being processed.
 */
protected CompletionStage<Void> upgradeLock(Object object, EntityEntry entry,
											LockOptions lockOptions,
											EventSource source) {

	LockMode requestedLockMode = lockOptions.getLockMode();
	if ( requestedLockMode.greaterThan( entry.getLockMode() ) ) {
		// The user requested a "greater" (i.e. more restrictive) form of
		// pessimistic lock

		if ( entry.getStatus() != Status.MANAGED ) {
			throw new ObjectDeletedException(
					"attempted to lock a deleted instance",
					entry.getId(),
					entry.getPersister().getEntityName()
			);
		}

		final EntityPersister persister = entry.getPersister();

		if ( log.isTraceEnabled() ) {
			log.tracev(
					"Locking {0} in mode: {1}",
					MessageHelper.infoString( persister, entry.getId(), source.getFactory() ),
					requestedLockMode
			);
		}

		final boolean cachingEnabled = persister.canWriteToCache();
		final SoftLock lock;
		final Object ck;
		if ( cachingEnabled ) {
			EntityDataAccess cache = persister.getCacheAccessStrategy();
			ck = cache.generateCacheKey(
					entry.getId(),
					persister,
					source.getFactory(),
					source.getTenantIdentifier()
			);
			lock = cache.lockItem( source, ck, entry.getVersion() );
		}
		else {
			lock = null;
			ck = null;
		}

		return ((ReactiveEntityPersister) persister).lockReactive(
				entry.getId(),
				entry.getVersion(),
				object,
				lockOptions,
				source
		).thenAccept( v -> entry.setLockMode(requestedLockMode) )
				.whenComplete( (r, e) -> {
					// the database now holds a lock + the object is flushed from the cache,
					// so release the soft lock
					if ( cachingEnabled ) {
						persister.getCacheAccessStrategy().unlockItem( source, ck, lock );
					}
				} );

	}
	else {
		return CompletionStages.nullFuture();
	}
}
 

/**
 * Performs a pessimistic lock upgrade on a given entity, if needed.
 *
 * @param object The entity for which to upgrade the lock.
 * @param entry The entity's EntityEntry instance.
 * @param requestedLockMode The lock mode being requested for locking.
 * @param source The session which is the source of the event being processed.
 * @throws HibernateException
 */
protected void upgradeLock(Object object, EntityEntry entry, LockMode requestedLockMode, SessionImplementor source)
throws HibernateException {

	if ( requestedLockMode.greaterThan( entry.getLockMode() ) ) {
		// The user requested a "greater" (i.e. more restrictive) form of
		// pessimistic lock

		if ( entry.getStatus() != Status.MANAGED ) {
			throw new ObjectDeletedException(
					"attempted to lock a deleted instance",
					entry.getId(),
					entry.getPersister().getEntityName()
			);
		}

		final EntityPersister persister = entry.getPersister();

		if ( log.isTraceEnabled() )
			log.trace(
					"locking " +
					MessageHelper.infoString( persister, entry.getId(), source.getFactory() ) +
					" in mode: " +
					requestedLockMode
			);

		final CacheConcurrencyStrategy.SoftLock lock;
		final CacheKey ck;
		if ( persister.hasCache() ) {
			ck = new CacheKey( 
					entry.getId(), 
					persister.getIdentifierType(), 
					persister.getRootEntityName(), 
					source.getEntityMode(), 
					source.getFactory() 
			);
			lock = persister.getCache().lock( ck, entry.getVersion() );
		}
		else {
			ck = null;
			lock = null;
		}
		
		try {
			if ( persister.isVersioned() && requestedLockMode == LockMode.FORCE ) {
				// todo : should we check the current isolation mode explicitly?
				Object nextVersion = persister.forceVersionIncrement(
						entry.getId(), entry.getVersion(), source
				);
				entry.forceLocked( object, nextVersion );
			}
			else {
				persister.lock( entry.getId(), entry.getVersion(), object, requestedLockMode, source );
			}
			entry.setLockMode(requestedLockMode);
		}
		finally {
			// the database now holds a lock + the object is flushed from the cache,
			// so release the soft lock
			if ( persister.hasCache() ) {
				persister.getCache().release(ck, lock );
			}
		}

	}
}