Spring实战之Cache-优快云博客

本文介绍如何在Spring框架中集成Ehcache进行缓存管理。通过配置Maven依赖、ehcache.xml及Spring配置文件，实现了对UserService的缓存代理，确保数据一致性的同时提升系统性能。

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spring cache caching exception user aop

这里假定我们已经有了一些现成的类和接口，比如说

1> 一个现成的User POJO对象

2> 一个UserDao接口和UserDaoHibernateImpl实现类

3> 一个UserService接口和UserServiceImpl实现类

1. 这是使用的是Maven做的项目管理工具，在使用cache（这里使用的是ehcache）之前，需要引入以下依赖

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<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.5.8</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-jdk14</artifactId>
<version>1.5.8</version>
</dependency>
<dependency>
<groupId>net.sf.ehcache</groupId>
<artifactId>ehcache</artifactId>
<version>2.2.0</version>
</dependency>
<dependency>
<groupId>org.springmodules</groupId>
<artifactId>spring-modules-cache</artifactId>
<version>0.8</version>
</dependency>

2.ehcache配置文件ehcache.xml

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<ehcache>
<defaultCache
maxElementsInMemory="500"
eternal="true"
overflowToDisk="false"
memoryStoreEvictionPolicy="LFU"/>
<cachename="userCache"
maxElementsInMemory="500"
eternal="true"
overflowToDisk="false"
memoryStoreEvictionPolicy="LFU"/>
</ehcache>

3. spring配置文件

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<?xmlversion="1.0"encoding="UTF-8"?>
<beansxmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:ehcache="http://www.springmodules.org/schema/ehcache"
xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop-2.0.xsd
http://www.springframework.org/schema/txhttp://www.springframework.org/schema/tx/spring-tx-2.0.xsd
http://www.springmodules.org/schema/ehcachehttp://www.springmodules.org/schema/cache/springmodules-ehcache.xsd"
default-lazy-init="true">
<ehcache:configconfigLocation="classpath:test/ehcache.xml"/>
<ehcache:proxyid="cachedUserService"refId="userService">
<ehcache:cachingmethodName="find*"cacheName="userCache"/>
<ehcache:cachingmethodName="list*"cacheName="userCache"/>
<ehcache:flushingmethodName="add*"cacheNames="userCache"when="before"/>
<ehcache:flushingmethodName="update*"cacheNames="userCache"when="before"/>
<ehcache:flushingmethodName="delete*"cacheNames="userCache"when="before"/>
</ehcache:proxy>
<beanid="userService"class="test.service.UserServiceImpl">
<propertyname="userDao"ref="userDao"/>
</bean>
<beanid="userDao"class="test.dao.UserDaoHibernateImpl">
<propertyname="sessionFactory"ref="mySessionFactory"/>
</bean>
<tx:adviceid="txAdvice"transaction-manager="myTransactionManager">
<tx:attributes>
<tx:methodname="get*"propagation="SUPPORTS"read-only="true"/>
<tx:methodname="list*"propagation="SUPPORTS"read-only="true"/>
<tx:methodname="find*"propagation="SUPPORTS"read-only="true"/>
<tx:methodname="*"propagation="REQUIRED"/>
</tx:attributes>
</tx:advice>
<aop:config>
<aop:pointcutid="userServiceOperation"expression="execution(**..service.UserService.*(..))"/>
<aop:advisoradvice-ref="txAdvice"pointcut-ref="userServiceOperation"/>
</aop:config>
<beanid="myTransactionManager"class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<propertyname="sessionFactory"ref="mySessionFactory"/>
</bean>
<beanid="mySessionFactory"class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<propertyname="dataSource"ref="myDataSource"/>
<propertyname="mappingResources">
<list>
<value>test/user.hbm.xml</value>
</list>
</property>
<propertyname="hibernateProperties">
<value>hibernate.dialect=org.hibernate.dialect.HSQLDialect</value>
</property>
</bean>
<beanid="myDataSource"class="org.apache.commons.dbcp.BasicDataSource"destroy-method="close">
<propertyname="driverClassName"value="org.hsqldb.jdbcDriver"/>
<propertyname="url"value="jdbc:hsqldb:res:hsqldb/testdb"/>
<propertyname="username"value="sa"/>
<propertyname="password"value=""/>
</bean>
</beans>

这里有几个地方需要注意：

1> 命名空间ehcache

xmlns:ehcache="http://www.springmodules.org/schema/ehcache"

http://www.springmodules.org/schema/ehcache http://www.springmodules.org/schema/cache/springmodules-ehcache.xsd

2> 以下ehcache的配置项必须放在第一行，否则会抛出异常Unexpected exception parsing XML document from class path resource [org/garbagecan/springstudy/dao/hibernate/spring-cache.xml]; nested exception is java.lang.IllegalStateException: An implementation of CacheProviderFacade should be registered under the name 'cacheProvider'

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