| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.ignite.cache.hibernate; |
| |
| import org.apache.ignite.Ignite; |
| import org.hibernate.cache.CacheException; |
| import org.hibernate.cache.spi.CacheDataDescription; |
| import org.hibernate.cache.spi.CollectionRegion; |
| import org.hibernate.cache.spi.access.AccessType; |
| import org.hibernate.cache.spi.access.CollectionRegionAccessStrategy; |
| import org.hibernate.engine.spi.SessionFactoryImplementor; |
| import org.hibernate.persister.collection.CollectionPersister; |
| |
| /** |
| * Implementation of {@link CollectionRegion}. This region is used to store collection data. |
| * <p> |
| * L2 cache for collection can be enabled in the Hibernate configuration file: |
| * <pre name="code" class="xml"> |
| * <hibernate-configuration> |
| * <!-- Enable L2 cache. --> |
| * <property name="cache.use_second_level_cache">true</property> |
| * |
| * <!-- Use Ignite as L2 cache provider. --> |
| * <property name="cache.region.factory_class">org.apache.ignite.cache.hibernate.HibernateRegionFactory</property> |
| * |
| * <!-- Specify entities. --> |
| * <mapping class="com.example.Entity"/> |
| * <mapping class="com.example.ChildEntity"/> |
| * |
| * <!-- Enable L2 cache with nonstrict-read-write access strategy for entities and collection. --> |
| * <collection-cache collection="com.example.Entity" usage="nonstrict-read-write"/> |
| * <collection-cache collection="com.example.ChildEntity" usage="nonstrict-read-write"/> |
| * <collection-cache collection="com.example.Entity.children" usage="nonstrict-read-write"/> |
| * </hibernate-configuration> |
| * </pre> |
| * Also cache for collection can be enabled using annotations: |
| * <pre name="code" class="java"> |
| * @javax.persistence.Entity |
| * public class Entity { |
| * ... |
| * |
| * @javax.persistence.OneToMany(cascade=CascadeType.ALL, fetch=FetchType.EAGER) |
| * @javax.persistence.JoinColumn(name="PARENT_ID") |
| * @org.hibernate.annotations.Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE) |
| * public List<ChildEntity> getChildren() {...} |
| * } |
| * </pre> |
| * Note: the collection cache does not cache the state of the actual entities in the cache, it caches only identifier |
| * values. For this reason, the collection cache should always be used in conjunction with |
| * the second-level cache for those entities expected to be cached as part of a collection cache. |
| */ |
| public class HibernateCollectionRegion extends HibernateTransactionalDataRegion implements CollectionRegion { |
| /** |
| * @param factory Region factory. |
| * @param name Region name. |
| * @param ignite Grid. |
| * @param cache Region cache. |
| * @param dataDesc Region data description. |
| */ |
| public HibernateCollectionRegion(HibernateRegionFactory factory, String name, |
| Ignite ignite, HibernateCacheProxy cache, CacheDataDescription dataDesc) { |
| super(factory, name, ignite, cache, dataDesc); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public CollectionRegionAccessStrategy buildAccessStrategy(AccessType accessType) throws CacheException { |
| return new AccessStrategy(createAccessStrategy(accessType)); |
| } |
| |
| /** |
| * Collection region access strategy. |
| */ |
| private class AccessStrategy extends HibernateAbstractRegionAccessStrategy |
| implements CollectionRegionAccessStrategy { |
| /** |
| * @param stgy Access strategy implementation. |
| */ |
| private AccessStrategy(HibernateAccessStrategyAdapter stgy) { |
| super(stgy); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public Object generateCacheKey(Object id, |
| CollectionPersister persister, |
| SessionFactoryImplementor factory, String tenantIdentifier) { |
| return HibernateKeyWrapper.staticCreateCollectionKey(id, persister, tenantIdentifier); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public Object getCacheKeyId(Object cacheKey) { |
| return ((HibernateKeyWrapper)cacheKey).id(); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public CollectionRegion getRegion() { |
| return HibernateCollectionRegion.this; |
| } |
| } |
| } |