I'm getting no
improvement in speed when using Ehcache with Hibernate
Here are the results I get when i run the test below. The test is reading 80 Stop objects and then the same 80 Stop objects again using the cache.
On the second read it is hitting the cache, but there is no
improvement in speed. Any idea's on what I'm doing wrong?
Speed Test:
First Read: Reading stops 1-80 : 288ms
Second Read: Reading stops 1-80 : 275ms
Cache Info:
elementsInMemory: 79
elementsInMemoryStore: 79
elementsInDiskStore: 0
JunitCacheTest
public class JunitCacheTest extends TestCase {
static Cache stopCache;
public void testCache()
{
ApplicationContext context = new ClassPathXmlApplicationContext("beans-hibernate.xml");
StopDao stopDao = (StopDao) context.getBean("stopDao");
CacheManager manager = new CacheManager();
stopCache = (Cache) manager.getCache("ie.dataStructure.Stop.Stop");
//First Read
for (int i=1; i<80;i++)
{
Stop toStop = stopDao.findById(i);
}
//Second Read
for (int i=1; i<80;i++)
{
Stop toStop = stopDao.findById(i);
}
System.out.println("elementsInMemory " + stopCache.getSize());
System.out.println("elementsInMemoryStore " + stopCache.getMemoryStoreSize());
System.out.println("elementsInDiskStore " + stopCache.getDiskStoreSize());
}
public static Cache getStopCache() {
return stopCache;
}
}
HibernateStopDao
@Repository("stopDao")
public class HibernateStopDao implements StopDao {
private SessionFactory sessionFactory;
@Transactional(readOnly = true)
public Stop findById(int stopId) {
Cache stopCache = JunitCacheTest.getStopCache();
Element cacheResult = stopCache.get(stopId);
if (cacheResult != null){
return (Stop) cacheResult.getValue();
}
else{
Stop result =(Stop) sessionFactory.getCurrentSession().get(Stop.class, stopId);
Element element = new Element(result.getStopID(),result);
stopCache.put(element);
return result;
}
}
}
ehcache.xml
<cache name="ie.dataStructure.Stop.Stop"
maxElementsInMemory="1000"
eternal="false"
timeToIdleSeconds="5200"
timeToLiveSeconds="5200"
overflowToDisk="true">
</cache>
stop.hbm.xml
<class name="ie.dataStructure.Stop.Stop" table="stops" catalog="hibernate3" mutable="false" >
<cache usage="read-only"/>
<comment></comment>
<id name="stopID" type="int">
<column name="STOPID" />
<generator class="assigned" />
</id>
<property name="coordinateID" type="int">
<column name="COORDINATEID" not-null="true">
<comment></comment>
</column>
</property>
<property name="routeID" type="int">
<column name="ROUTEID" not-null="true">
<comment></comment>
</column>
</property>
</class>
Stop
public class Stop implements Comparable<Stop>, Serializable {
private static final long serialVersionUID = 7823769092342311103L;
private Integer stopID;
private int routeID;
private int coordinateID;
}
