Spring-Hibernate Caching with Memcached - spring

Question

I have an application whose back end has been made with Spring and Hibernate.
I Want to apply memcaching to make the application more scalable. At first i thought that i could integrate the second level cache of hibernate with memcache but the problem arouse was that all the HQL written in the application r like book.grade.id where Book & Grade are two separate entities, hence, the second level cache mechanism failed.
Can anyone recommend me a way to implement caching? I have had a look at EHCache but i want the Memcache implementation for now. My application will be hit by several servers but only 1 Database Server will exist. Given the required conditions, any recommendations?

Answer 1

Below mentioned are the steps you can follow.
pom.xml changes to include the abstract cache mechanism for memcache and client implementation using xmemcache.
com.google.code.simple-spring-memcached
spring-cache
3.1.0
<dependency>
<groupId>com.google.code.simple-spring-memcached</groupId>
<artifactId>xmemcached-provider</artifactId>
<version>3.1.0</version>
</dependency>
Note : You need to include cglib too as this is aop based.
configuration.xml file changes
**defining beans**
<bean name="cacheManager" class="com.google.code.ssm.spring.SSMCacheManager">
<property name="caches">
<set>
<bean class="com.google.code.ssm.spring.SSMCache">
<constructor-arg name="cache" index="0" ref="defaultCache"/>
<!-- 5 minutes -->
<constructor-arg name="expiration" index="1" value="300"/>
<!-- #CacheEvict(..., "allEntries" = true) doesn't work -->
<constructor-arg name="allowClear" index="2" value="false"/>
</bean>
</set>
</property>
</bean>
<bean name="defaultCache" class="com.google.code.ssm.CacheFactory">
<property name="cacheName" value="defaultCache" />
<property name="cacheClientFactory">
<bean name="cacheClientFactory"
class="com.google.code.ssm.providers.xmemcached.MemcacheClientFactoryImpl" />
</property>
<property name="addressProvider">
<bean class="com.google.code.ssm.config.DefaultAddressProvider">
<property name="address" value="x.x.x.x:11211" />
</bean>
</property>
<property name="configuration">
<bean class="com.google.code.ssm.providers.CacheConfiguration">
<property name="consistentHashing" value="true" />
</bean>
</property>
</bean>
Sample method...
#Cacheable(value="defaultCache", key="new Integer(#id).toString().concat('.BOOKVO')")
public BookVO getBookById(Integer id){
...
}
with this changes your method will hit the db only if the key is not found in the memcache server.