Question

I am trying to use ehcache in my project.. i have specified the following properties in hibernate config file –

config.setProperty(“hibernate.cache.provider_class”,”org.hibernate.cache.EhCacheProvider”);
config.setProperty(“hibernate.cache.provider_configuration_file_resource_path”,”ehcache.xml”);
config.setProperty(“hibernate.cache.use_second_level_cache”,”true”);
config.setProperty(“hibernate.cache.use_query_cache”,”true”);

Now i am still not sure whether the results are coming from DB or the cache..

I looked around and found – Hibernate second level cache – print result where the person is suggesting HitCount/Misscount API’s

However when i tried using it the hitcount and miss count is always returned 0… here’s my code

String rName = “org.hibernate.cache.UpdateTimestampsCache”;
Statistics stat =
HibernateHelper.getInstance().getFactory().getStatistics();
long oldMissCount =
stat.getSecondLevelCacheStatistics(rName).getMissCount();
long oldHitCount =
stat.getSecondLevelCacheStatistics(rName).getHitCount();
UserDAO user = new UserDAO();
user.read(new Long(1)); long
newMissCount =
stat.getSecondLevelCacheStatistics(rName).getMissCount();
long newHitCount =
stat.getSecondLevelCacheStatistics(rName).getHitCount();

if(oldHitCount+1 == newHitCount &&
oldMissCount+1 == newMissCount) {
System.out.println(“came from DB”); }
else if(oldHitCount+1 == newHitCount
&& oldMissCount == newMissCount) {
System.out.println(“came from cache”);
}

Please let me know if i am using it wrong.. and what should be the rName(region Name) in this case..

Is there any other way of determining whether the second level cache is working ??

Thanks

Answer 1

You need to enable statistics collection:

config.setProperty("hibernate.generate_statistics", "true");