We have an extensive entity model with 100+ entity classes. All the entity classes are subclasses of a single entity superclasses. The shared cache mode has been set to ALL.
@Entity
@Inheritance(strategy = InheritanceType.JOINED)
@Table(name = "entities")
public abstract class LongIdEntity {
@Id
@GeneratedValue(strategy = GenerationType.TABLE)
private Long id;
@Version
@Column(name = "OPT_LOCK_VERSION")
private Long lockVersion;
etc...
}
An example subclass:
@Entity
@Table(name = "cars")
public class Car extends LongIdEntity { ... }
We'd like to cache all entities in the 2nd level cache. The problem is that only 1 cache region is made for all the entities; named LongIdEntity.
Debugging shows Hibernate did find all the entity classes, but assigns them the same region anyway. Because at SessionFactoryImpl:339 :
String cacheRegionName = cacheRegionPrefix + model.getRootClass().getCacheRegionName();
In our case, the call to model.getRootClass() will always yield "LongIdEntity".
I presume this would indeed cache all the entities, but without any control of eviction. Some classes are very frequent and read-only. So we want to keep them pinned into memory. Some are typically used in a certain time span, etc... Cramming it all into the same cache invalidates it all.
Specifying the region in the annotation has no effect. For example:
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE,region = "cars")
@Entity
@Table(name = "cars")
public class Car extends LongIdEntity { ... }
The weird thing is that only shared cache mode ALL picks up the entity classes. In any other mode no entities are - even when annotated with @Cache and/or @Cacheable. Maybe this is an indication ?
Somebody has an idea how I can assign specific entity classes specific regions ?
TIA :-)
persistence.xml is elementary:
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="cars" transaction-type="RESOURCE_LOCAL">
<shared-cache-mode>ALL</shared-cache-mode>
</persistence-unit>
</persistence>
The session factory is made the classic way:
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceProviderClass" value="org.hibernate.ejb.HibernatePersistence"/>
<property name="persistenceUnitName" value="optimus"/>
<property name="dataSource" ref="dataSource"/>
<property name="jpaProperties">
<props>
<prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory</prop>
<prop key="hibernate.cache.use_second_level_cache">true</prop>
<prop key="hibernate.cache.use_query_cache">true</prop>
<prop key="hibernate.generate_statistics">true</prop>
<prop key="hibernate.cache.default_cache_concurrency_strategy">NONSTRICT_READ_WRITE</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
<prop key="hibernate.jdbc.batch_size">1000</prop>
<prop key="hibernate.show_sql">false</prop>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop>
<prop key="hibernate.search.default.directory_provider">filesystem</prop>
<prop key="hibernate.search.default.indexBase">/hibernate-search</prop>
</props>
</property>
</bean>
The environment
- JDK6
- Linux x64
- Hibernate 4.1.10
- Spring 3.2.1
UPDATE: Use @MappedSuperclass
@MappedSuperclass
@Inheritance(strategy = InheritanceType.JOINED)
public abstract class LongIdEntity { ... }
Does not change a thing either.
