Spring+EHcache配置

<ehcache>

??? <!-- Sets the path to the directory where cache .data files are created.

???????? If the path is a Java System Property it is replaced by
???????? its value in the running VM.

???????? The following properties are translated:
???????? user.home - User's home directory
???????? user.dir - User's current working directory
???????? java.io.tmpdir - Default temp file path -->
??? <diskStore path="java.io.tmpdir"/>

??? <!--Default Cache configuration. These will applied to caches programmatically created through
??????? the CacheManager.

??????? The following attributes are required:

??????? maxElementsInMemory??????????? - Sets the maximum number of objects that will be created in memory
??????? eternal??????????????????????? - Sets whether elements are eternal. If eternal,? timeouts are ignored and the
???????????????????????????????????????? element is never expired.
??????? overflowToDisk???????????????? - Sets whether elements can overflow to disk when the in-memory cache
???????????????????????????????????????? has reached the maxInMemory limit.

??????? The following attributes are optional:
??????? timeToIdleSeconds????????????? - Sets the time to idle for an element before it expires.
???????????????????????????????????????? i.e. The maximum amount of time between accesses before an element expires
???????????????????????????????????????? Is only used if the element is not eternal.
???????????????????????????????????????? Optional attribute. A value of 0 means that an Element can idle for infinity.
???????????????????????????????????????? The default value is 0.
??????? timeToLiveSeconds????????????? - Sets the time to live for an element before it expires.
???????????????????????????????????????? i.e. The maximum time between creation time and when an element expires.
???????????????????????????????????????? Is only used if the element is not eternal.
???????????????????????????????????????? Optional attribute. A value of 0 means that and Element can live for infinity.
???????????????????????????????????????? The default value is 0.
??????? diskPersistent???????????????? - Whether the disk store persists between restarts of the Virtual Machine.
???????????????????????????????????????? The default value is false.
??????? diskExpiryThreadIntervalSeconds- The number of seconds between runs of the disk expiry thread. The default value
???????????????????????????????????????? is 120 seconds.
??????? -->

??? <defaultCache
??????? maxElementsInMemory="10000"
??????? eternal="false"
??????? overflowToDisk="true"
??????? timeToIdleSeconds="120"
??????? timeToLiveSeconds="120"
??????? diskPersistent="false"
??????? diskExpiryThreadIntervalSeconds="120"/>
???????
??? <!-- See http://ehcache.sourceforge.net/documentation/#mozTocId258426 for how to configure caching for your objects -->
</ehcache>

2.applicationContext-hibernate.xml里Hibernate SessionFactory配置：

? <!-- Hibernate SessionFactory -->
??? <bean id="sessionFactory" ref="dataSource"/>
??????? <property name="configLocation"><value>classpath:hibernate.cfg.xml</value></property>
??????? <!-- The property below is commented out b/c it doesn't work when run via
???????????? Ant in Eclipse.? It works fine for individual JUnit tests and in IDEA ??
??????? <property name="mappingJarLocations">
??????????? <list><value>file:dist/appfuse-dao.jar</value></list>
??????? </property>
??????? -->
??????? <property name="hibernateProperties">
??????????? <props>
??????????????? <prop key="hibernate.dialect">@HIBERNATE-DIALECT@</prop>
??????????????? <!--<prop key="hibernate.show_sql">true</prop>-->
??????????????? <prop key="hibernate.max_fetch_depth">3</prop>
??????????????? <prop key="hibernate.hibernate.use_outer_join">true</prop>
??????????????? <prop key="hibernate.jdbc.batch_size">10</prop>
??????????????? <prop key="hibernate.cache.use_query_cache">true</prop>
??????????????? <prop key="hibernate.cache.use_second_level_cache">true</prop>
??????????????? <prop key="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</prop>
??????????????? <!--
??????????????? <prop key="hibernate.use_sql_comments">false</prop>
??????????????? -->
??????????????? <!-- Create/update the database tables automatically when the JVM starts up
??????????????? <prop key="hibernate.hbm2ddl.auto">update</prop> -->
??????????????? <!-- Turn batching off for better error messages under PostgreSQL
??????????????? <prop key="hibernate.jdbc.batch_size">0</prop> -->
??????????? </props>
??????? </property>
??????? <property name="entityInterceptor">
?????????? <ref local="auditLogInterceptor"/>
??????? </property>
??? </bean>

说明：如果不设置“查询缓存”，那么hibernate只会缓存使用load()方法获得的单个持久化对象，如果想缓存使用findall()、 list()、Iterator()、createCriteria()、createQuery()等方法获得的数据结果集的话，就需要设置hibernate.cache.use_query_cache true 才行

3.model类里采用Xdoclet生成*.hbm.xml里的cache xml标签，即<cache usage="read-only"/>

/**
?* @hibernate.class table="WF_WORKITEM_HIS"
?* @hibernate.cache usage="read-write"
?*
?*/

4.对于"query cache"，需要在程序里编码：

??????? getHibernateTemplate().setCacheQueries(true);
??????? return getHibernateTemplate().find(hql);