memcached with @Cacheable is not working

[kishore....@gmail.com]

Hi All,

I am a newbie to memcache. I have a webservice which will return objects in json format, that one I would like to cache it.I have the following configuration in my application. Though I am not getting any error/exception, doesn't look like it is working because I can see the generated hql in the logs as many times I am invoking this service.


I have elastic cache cluster available in Amazone cloude. This is nothing but memcache managed by Amazone. Can I replace this address with DefaultAddressProvider's address?



<context:annotation-config />

    <bean class="org.springframework.web.servlet.view.BeanNameViewResolver" />
         <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"/>
                    <constructor-arg name="expiration" index="1" value="300"/>
                    <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="cloudadress:11211"/>
            </bean>
        </property>
        <property name="configuration">
            <bean class="com.google.code.ssm.providers.CacheConfiguration">
                <property name="consistentHashing" value="true"/>
            </bean>
        </property>
    </bean>


I have added the @Cacheable at method level in one of my Controller class, that invokes db through hibernate
    @RequestMapping(method = RequestMethod.GET, value = "/{ids}")
    @ResponseBody
    @EnableApiRequestResponseLogging
    @Cacheable(value = "defaultCache", key = "#ids")
    public ResponseEntity<List<MyModel>> read(@PathVariable("ids") String ids, final HttpServletRequest request) throws ServiceException {}

Can someone help me out on this?

Regards,
Kishor

[Jakub Białek]

Hi,

It should be possible to use and configure Amazon elastic search using DefaultAddressProvider, just provide hostname (or ip) and port number.

Regarding the cache issue I think it because how Spring is using proxy, here you can read a nice article that explains it: http://spring.io/blog/2012/05/23/transactions-caching-and-aop-understanding-proxy-usage-in-spring.

In general you shouldn't use @Cacheable at controller level instead:

- use @Cacheable on your services (beans that are used by controllers)

- if you want to cache controller's response (http response) use dedicated software: Varnish it will be a lot faster than caching in Java code (no matter what cache backend is used: memcached, ehcache, infinispan, hashmap).

Best regards,

-- Ragnor

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[kishore....@gmail.com]

Hi Ragnor,

Thanks for your post. I had gone thru the link which you mentioned in the previous post. As you mentioned I put @Cacheable in my service class, then I was getting

Caused by: org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class

Once I added default constructor in it, then it was not throwing any exception but still it is not caching.

I even changed the defaultaddressprovider's address to some another address which is not existing. Still it is not
throwing any exception. Looks like spring framework is ignoring the @Cacheable annotaion.

Regards,
Kishor

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[kishore....@gmail.com]

it was the connection issue. it was not able to connect to the memcache server. So in this case it should throw some exception, rt?

Kishor

[Jakub Białek]

Could you please show your Spring's xml configuration files?

You can look at http://code.google.com/p/simple-spring-memcached/source/browse/#svn%2Ftrunk%2Fspring-cache-integration-test to see working example of Spring Cache and SSM. As you can see the application-context.xml should contain:

<cache:annotation-driven />

<context:annotation-config />


<context:component-scan base-package="com.mypackage" />

-- Ragnor

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