hibernate 3.3采用新的缓存方法

hibernate 3.3采用新的缓存方法2011-01-19 javaeye xly_971223今天查看hibernate cache接口时 svn了hibernate3.3的源码

打开CacheProvider类一看居然给 @deprecated

真是大块人心

早就对hibernate的二级缓存和查询缓存不爽

只能按照实体配置不能针对某条查询语句设置

3.3的提供了两个接口 Region RegionFactory 来代替 3.2中的Cache CacheProvider

看看RegionFactory 的实现吧

看看这几个方法名字是多么的让人激动

Java代码

buildCollectionRegion 对集合的缓存 猜测是对一对多的集合进行配置的吧
buildQueryResultsRegion 查询缓存 自定义的查询 也可以有自己的region了
buildTimestampsRegion  给缓存设置过期时间吧

英文不好猜测的英文好的可以翻译一下

在gg上搜索了一下hibernate RegionFactory 关键字居然没搜索到

难道大家对个功能都不感冒

Java代码

public interface RegionFactory {

  public void start（Settings settings, Properties properties） throws CacheException;

  public void stop（）;

  public boolean isMinimalPutsEnabledByDefault（）;

  public long nextTimestamp（）;

  public EntityRegion buildEntityRegion（String regionName, Properties properties, CacheDataDescription metadata） throws CacheException;

  public CollectionRegion buildCollectionRegion（String regionName, Properties properties, CacheDataDescription metadata） throws CacheException;

  public QueryResultsRegion buildQueryResultsRegion（String regionName, Properties properties） throws CacheException;

  public TimestampsRegion buildTimestampsRegion（String regionName, Properties properties） throws CacheException;
}

附上hibernate3.3 cache包里的说明

引用

This package defines APIs/SPIs and implementations for the Hibernate second-level cache.

The legacy （and now deprecated） approach to caching is defined by the {@link org.hibernate.cache.CacheProvider} and {@link org.hibernate.cache.Cache} interfaces as well as the {@link org.hibernate.cache.CacheConcurrencyStrategy} interface along with the various implementations of all these interfaces. In that scheme, a {@link org.hibernate.cache.CacheProvider} defined how to configure and perform lifecycle operations in regards to a particular underlying caching library; it also defined how to build {@link org.hibernate.cache.Cache} instances which in turn defined how to access the "regions" of the underlying cache instance. For entity and collection data cache regions, {@link org.hibernate.cache.CacheConcurrencyStrategy} wrapped access to those cache regions to apply transactional/concurrent access semantics.

The improved approach is based on {@link org.hibernate.cache.RegionFactory}, the various {@link org.hibernate.cache.Region} specializations and the two access strategies contracts （{@link org.hibernate.cache.access.EntityRegionAccessStrategy} and {@link org.hibernate.cache.access.CollectionRegionAccessStrategy}）. The general approach here is that {@link org.hibernate.cache.RegionFactory} defined how to configure and perform lifecycle operations in regards to a particular underlying caching library （or libraries）. {@link org.hibernate.cache.RegionFactory} also defines how to build specialized {@link org.hibernate.cache.Region} instances based on the type of data we will be storing in that given region. The fact that {@link org.hibernate.cache.RegionFactory} is asked to build specialized regions （as opposed to just general access） is the first improvement over the legacy scheme. The second improvement is the fact that the regions （well the ones like entity and collection regions that are responsible for storing {@link org.hibernate.cache.TransactionalDataRegion transactional} data） are asked to build their own access strategies （see {@link org.hibernate.cache.EntityRegion#buildAccessStrategy} and {@link org.hibernate.cache.CollectionRegion#buildAccessStrategy}）.