Terracotta Discussion Forums (LEGACY READ-ONLY ARCHIVE)

Hi Rakesh,
A bit of explanation would clarify my doubts, if you can. What do you mean by single stripe?(Sorry, might seem a dumb question to you

)

Regards,
Niteesh

Hi Raj,
Thanks for the reply. But that open source you are talking about does not have Server array right? For distributed environment, is there any OOB feature other than TSA?

Cheers,
Niteesh

Hi All,
At one of our (webMethods) customer place, we were asked about Open Source TSA and BigMemory.

1. Is there anything called Open Source TSA?(EhCache is Open Source Proj AFAIK) .

2. Any free version of BigMemory available? If yes can it be used without TSA?

Any pointers would be great.

Regards,
Niteesh

Hi Alex,

I have tried removing the <property name="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</property> . But no change in behaviour.

The point to consider here is, I am getting the errors only in case of giving Thread.sleep(5000); duration. If i restart my tc server and give low value like 2000ms or so, that will run successfully.

Can somebody explain this behaviour? If at all my object is evicted after TTL, it should be loaded from DB rite? Why its throwing error?

Regards,
Niteesh

Thanks Alex for the reply.

My jar details are below:
hibernate3.jar
ehcache-core-ee-2.6.0.jar
ehcache-terracotta-ee-2.6.0.jar
terracotta-toolkit-1.6-runtime-ee-5.0.0.jar

hibernate-config.xml:
----------------------------------------------------------------------------
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
<session-factory>
<property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
<property name="connection.url">jdbc:oracle:thin:@blramd4.eur.ad.sag:1521:R11U2DB1</property>
<property name="hibernate.connection.username">asar2</property>
<property name="hibernate.connection.password">asar2</property>
<property name="hibernate.connection.pool_size">20</property>
<property name="show_sql">true</property>
<property name="dialect">org.hibernate.dialect.OracleDialect</property>
<property name="hibernate.temp.use_jdbc_metadata_defaults">false</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<property name="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</property>
<property name="hibernate.cache.region.factory_class">net.sf.ehcache.hibernate.EhCacheRegionFactory</property>
<property name="hibernate.cache.use_second_level_cache">true</property>
<property name="hibernate.cache.use_query_cache">true</property>

<property name="hibernate.cache.provider_configuration_file_resource_path">ehcache.xml</property>
<property name="hibernate.generate_statistics">true</property>
<property name="hibernate.default_batch_fetch_size">16</property>
<property name="hibernate.jdbc.batch_size">50</property>


<mapping resource="contact.hbm.xml"/>

</session-factory>
</hibernate-configuration>
----------------------------------------------------------------------------------
contact.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="roseindia.tutorial.hibernate.Contact" table="CONTACT">
<cache usage="nonstrict-read-write" />
<id name="id" type="int" column="ID" >
<generator class="assigned"/>
</id>
<property name="firstName">
<column name="FIRSTNAME" />
</property>
<property name="lastName">
<column name="LASTNAME"/>
</property>
<property name="email">
<column name="EMAIL"/>
</property>
</class>
</hibernate-mapping>
----------------------------------------------------------------------------------

Awaiting your response,

Regards,
Niteesh:)

Thanks Karthik for quick reply. Ya, I will check the versions of them.
But what I am confused is, if the object is evicted from cache after the timeout, my code should load the value from DB as before right? Why it is throwing errors? And also this behaviour is not consistent. When i start my tc-server first time and run this code it sometimes runs without errors. But when i run second time without restarting tc server, its giving errors each time.

Need your advice.
Thanks,
Niteesh

Hi All,
I am using ehCache level2 for hibernate. I want to know how can i check whether cached object is removed after TTL. I have connected it to dev-console too. But there, cached object count is not at all decreasing. And once its started there are some extra cached objects(For ex:Caching:688,offheap:0,tatal:957). I am adding only 2 objects.
Here is my code:

//import net.sf.ehcache.Cache;

import net.sf.ehcache.CacheManager;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.stat.SecondLevelCacheStatistics;

public class HibernateEhCacheExample {
public static void main(String[] args) {

Session session1 = null;

CacheManager manager = new CacheManager("src/ehcache.xml");//Loading existing cache manager

SessionFactory sessionFactory = new Configuration().configure("hibernate.cfg.xml").buildSessionFactory();//Read hibernate.cfg.xml and prepare hibernate for use
//Opening first session
session1 =sessionFactory.openSession();
System.out.println("Cache Statistics when its empty");
System.out.println("Cache Hits----"+sessionFactory.getStatistics().getSecondLevelCacheHitCount() );
System.out.println("Cache Misses----"+sessionFactory.getStatistics().getSecondLevelCacheMissCount());

Object o = session1.load(Contact.class, new Integer(6));// Loading the first object
Contact c = (Contact) o;

System.out.println("Cache Mode"+session1.getCacheMode());// NORMAL, IGNORE, GET, PUT.. etc
System.out.println("Loaded First Contact object's Name is___"+c.getFirstName());
System.out.println("Object Loaded from DB successfully.....!!");

session1.close();//Closing first session

System.out.println("------------------------------");
System.out.println("Waiting for exceeding Cache TimeToLive ......");
//Waiting for Cache timeout i.e 5000ms

try {
Thread.sleep(5000); //Waiting for Cache timeout i.e 5000ms
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

System.out.println("5 seconds compelted......!!!!!!!!");

// Create second session after timeout
Session session2 = sessionFactory.openSession();
Object o2 = session2.load(Contact.class, new Integer(6));// Loading the same first object from DB
Contact c2 = (Contact) o2;
System.out.println("");
System.out.println("Loaded First Contact object's Name is___"+c2.getFirstName());
System.out.println("Object loaded from the database, since timeout happened...!!");
//System.out.println("Cache Hits----"+sessionFactory.getStatistics().getSecondLevelCacheHitCount() );
System.out.println("Cache Misses----"+sessionFactory.getStatistics().getSecondLevelCacheMissCount());
System.out.println("Cache Hits----"+sessionFactory.getStatistics().getSecondLevelCacheHitCount() );

// Load a different object 7 in same session
Object o4 = session2.load(Contact.class, new Integer(7));
Contact c4 = (Contact) o4;
System.out.println("Loaded Second Contact object's Name is___"+c4.getFirstName());
System.out.println("Second Object loaded from DB since its a new Object.....!!");
System.out.println("Cache Hits----"+sessionFactory.getStatistics().getSecondLevelCacheHitCount() );
System.out.println("Cache Misses----"+sessionFactory.getStatistics().getSecondLevelCacheMissCount());

session2.close();

//Creating second session before cache timeout
Session session3 = sessionFactory.openSession();
Object o3 = session3.load(Contact.class, new Integer(7));
Contact c3 = (Contact) o3;
System.out.println("Loaded Second Contact object's Name is____"+c3.getFirstName());
System.out.println("Second Object loaded from global cache successfully.....!!");

SecondLevelCacheStatistics slcs = session3.getSessionFactory().getStatistics().getSecondLevelCacheStatistics("roseindia.tutorial.hibernate.Contact");

System.out.println("Cache Hits----"+sessionFactory.getStatistics().getSecondLevelCacheHitCount() );
System.out.println("Cache Misses----"+sessionFactory.getStatistics().getSecondLevelCacheMissCount());

System.out.println("----------------------Summary--------------------------------------");
System.out.println("Element Count in Cache Memory--"+slcs.getElementCountInMemory());
System.out.println("Put Count in Cache--"+slcs.getPutCount());
System.out.println("Element Count in Disk--"+slcs.getElementCountOnDisk());

// For Checking whether Key Exists or Not
/* for(Iterator<Object> iterator = keyList.iterator(); iterator.hasNext();){
Object key = iterator.next();
if(manager.getCache("roseindia.tutorial.hibernate.Contact").isKeyInCache(key)){

System.out.println("Key Object exists--"+key);
}
} */

/* Boolean status=true;

while(status)
{

} */

session3.close();

sessionFactory.close();

}
}
[/code]

ehCache.xml:
<cache name="Contact" maxElementsInMemory="100" eternal="false" timeToIdleSeconds="5" timeToLiveSeconds="5" memoryStoreEvictionPolicy="LFU" diskPersistent="false">
<terracotta/>
</cache>

I am also getting the below errors after 5sec for runs (except first one after i start tc server).

Exception in thread "main" org.hibernate.cache.CacheException: net.sf.ehcache.CacheException: Uncaught exception in get() - org.hibernate.cache.CacheKey.<init>(Ljava/io/Serializable;Lorg/hibernate/type/Type;Ljava/lang/String;Lorg/hibernate/EntityMode;Lorg/hibernate/engine/SessionFactoryImplementor;)V
at org.hibernate.cache.EhCache.get(EhCache.java:123)
at org.hibernate.cache.NonstrictReadWriteCache.get(NonstrictReadWriteCache.java:41)
at org.hibernate.event.def.DefaultLoadEventListener.loadFromSecondLevelCache(DefaultLoadEventListener.java:469)
at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:350)
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:166)
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:140)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:119)
at org.hibernate.impl.SessionImpl.immediateLoad(SessionImpl.java:571)
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:59)
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:80)
at org.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:133)
at roseindia.tutorial.hibernate.Contact$$EnhancerByCGLIB$$8bff1cfa.getFirstName(<generated>)
at roseindia.tutorial.hibernate.HibernateEhCacheExample.main(HibernateEhCacheExample.java:30)
Caused by: net.sf.ehcache.CacheException: Uncaught exception in get() - org.hibernate.cache.CacheKey.<init>(Ljava/io/Serializable;Lorg/hibernate/type/Type;Ljava/lang/String;Lorg/hibernate/EntityMode;Lorg/hibernate/engine/SessionFactoryImplementor;)V
at org.terracotta.modules.ehcache.store.ClusteredSafeStore.get(ClusteredSafeStore.java:685)
at net.sf.ehcache.Cache.searchInStoreWithStats(Cache.java:1960)
at net.sf.ehcache.Cache.get(Cache.java:1588)
at net.sf.ehcache.Cache.get(Cache.java:1561)
at org.hibernate.cache.EhCache.get(EhCache.java:110)
... 12 more
Caused by: java.lang.NoSuchMethodError: org.hibernate.cache.CacheKey.<init>(Ljava/io/Serializable;Lorg/hibernate/type/Type;Ljava/lang/String;Lorg/hibernate/EntityMode;Lorg/hibernate/engine/SessionFactoryImplementor;)V
at org.terracotta.modules.ehcache.store.HibernateElementSerializationStrategy.readStringKey(HibernateElementSerializationStrategy.java:49)
at org.terracotta.cache.serialization.DsoSerializationStrategy2.deserializeStringKey(DsoSerializationStrategy2.java:74)
at org.terracotta.modules.ehcache.store.ValueModeHandlerSerialization.realKeyObjectFor(ValueModeHandlerSerialization.java:139)
at org.terracotta.modules.ehcache.store.ValueModeHandlerSerialization.getRealKeyObject(ValueModeHandlerSerialization.java:126)
at org.terracotta.modules.ehcache.store.ValueModeHandlerHibernate.getRealKeyObject(ValueModeHandlerHibernate.java:8)
at org.terracotta.modules.ehcache.store.ClusteredStoreBackendImpl$TDCWithEvents.onExpiry(ClusteredStoreBackendImpl.java:250)
at org.terracotta.cache.TerracottaDistributedCache.expire(TerracottaDistributedCache.java:518)
at org.terracotta.cache.TerracottaDistributedCache.getNonExpiredEntry(TerracottaDistributedCache.java:257)
at org.terracotta.cache.TerracottaDistributedCache.getNonExpiredEntryUnlocked(TerracottaDistributedCache.java:157)
at org.terracotta.cache.TerracottaDistributedCache.unlockedGetTimestampedValue(TerracottaDistributedCache.java:654)
at org.terracotta.modules.ehcache.store.ClusteredStoreBackendImpl.unlockedGetTimestampedValue(ClusteredStoreBackendImpl.java:183)
at org.terracotta.modules.ehcache.store.backend.NonStrictBackend.get(NonStrictBackend.java:181)
at org.terracotta.modules.ehcache.store.ClusteredStore.doGet(ClusteredStore.java:419)
at org.terracotta.modules.ehcache.store.ClusteredStore.get(ClusteredStore.java:405)
at org.terracotta.modules.ehcache.store.ClusteredSafeStore.get(ClusteredSafeStore.java:682)
... 16 more

Hi all,

I am not able to add searchable attributes to the existing Cache Manager, not the new one. Kindly throw some light on this. Maybe a piece of code would be better.

I have tried this:
Cache cache = manager.getCache("sampleCache1");
Configuration cacheManagerConfig = new Configuration();
CacheConfiguration config = cache.getCacheConfiguration();

Searchable searchable = new Searchable();
config.addSearchable(searchable);

//Adding Search properties

searchable.addSearchAttribute(new SearchAttribute().name("empID").expression("value.getEmpID()"));
searchable.addSearchAttribute(new SearchAttribute().name("empName").expression("value.getEmpName()"));

Regards,
Niteesh