1 Reply Latest reply: Mar 20, 2012 5:40 AM by Galder Zamarreño RSS

CacheLoader

Meena Rajnai Newbie

Hi I need help in loading data from the database to infinispan with cacheloader.  I have configured infinispan-config.xml file like this. I have created the tables in postgres.

 

 

 

 

<namedCache name="entity">
       <loaders passivation="false" shared="false" preload="true">
          <loader class="org.infinispan.loaders.jdbc.stringbased.JdbcStringBasedCacheStore" fetchPersistentState="true" purgeOnStartup="false">
            <properties>
              <property name="stringsTableNamePrefix" value="bookentity" />
                      <property name="idColumnName" value="isbn" />
                      <property name="dataColumnName" value="authorname" />
                      <property name="databaseType" value="POSTGRES" />
                       <property name="datasourceJndiLocation" value="java:/PostgresDS" />
                     <!--    <property name="connectionFactoryClass" value="org.infinispan.loaders.jdbc.connectionfactory.PooledConnectionFactory" />  -->
             <property name="connectionFactoryClass" value="org.infinispan.loaders.jdbc.connectionfactory.ManagedConnectionFactory" /> 
                    <!--  <property name="connectionUrl" value="jdbc:postgresql://129.78.10.201:5432/test1" /> -->
                      <property name="userName" value="postgres" />
                      <!--<property name="password" value="password" />-->
                      <property name="driverClass" value="org.postgresql.Driver" />
                      <property name="idColumnType" value="INTEGER" />
                      <property name="dataColumnType" value="VARCHAR(255)" />
                      <property name="dropTableOnExit" value="false" />
                      <property name="createTableOnStart" value="true" />
            </properties>
          </loader>
        </loaders>

 

My persistence.xml file is

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
   version="1.0">
   <persistence-unit name="InfiniBookSahredCache-ejbPU" transaction-type="JTA">
   <provider>org.hibernate.ejb.HibernatePersistence</provider> 
      <jta-data-source>java:/PostgresDS</jta-data-source>
            <properties>
          <property name="hibernate.hbm2ddl.auto" value="update"/>
           <property name="hibernate.session_factory_name" value="SessionFactories/infinispan"/>
           <property name="javax.persistence.sharedCache.mode" value="ALL"/>
           
         
    <property name="hibernate.cache.use_second_level_cache" value="true" />
    <property name="hibernate.cache.use_query_cache" value="true"/>
    
    
    <property name="hibernate.cache.region_prefix" value="infinispan" />
    
     <property name="hibernate.cache.region.factory_class" value="org.hibernate.cache.infinispan.InfinispanRegionFactory"/>
       <property name="hibernate.cache.infinispan.cachemanager" value="java:CacheManager/entity"/> 
      </properties>
      
      
   </persistence-unit>
</persistence>

My BookSessionBean  which has all the business logic for creating, listing books. What I want to do is to load the data into cache without manually doing a put command to cache. seems there should be a straight forward way of loading the cache with the data from database (with a cache loader set). I am lost.   Please let me know how to do that  with the EJB and also with a simple application.

@Stateless
@Remote(BookInterface.class)
public class BookSessionBean implements BookInterface{
@PersistenceContext (unitName = "InfiniBookSahredCache-ejbPU")
protected EntityManager em;

@Resource(name = "CacheManager/entity", mappedName = "java:CacheManager/entity")
protected    EmbeddedCacheManager cm;

    public void addBook(Integer isbn, String a, String t){
        
        BookEntity bIns = new BookEntity();
        bIns.setAuthor(a);
        bIns.setISBN(isbn);
        bIns.setTitle(t);
        em.persist(bIns);
    
    }

public void listbooksTest() {
     Cache<Integer, BookEntity> c = cm.getCache("entity");
     System.out.println(c.getConfiguration().getCacheLoaders().isEmpty()+"this is from cacheloader");
     Query q = em.createQuery("SELECT b FROM BookEntity b");
     System.out.println(c.isEmpty()+"THHHHHHHHHHHHHHHHHHHHHHHHHIIIIIIIIIIIIIIIIIISSSSSSis from cache"); // output is true
     System.out.println(c.getConfiguration().getCacheLoaders().isEmpty()+"this is from cacheloader"); // output  flase
     System.out.println(c.getConfiguration().isCacheLoaderPreload()+" is preloaded"); //output true
        
     CacheLoaderManager manager2 = c.getAdvancedCache().getComponentRegistry().getComponent(CacheLoaderManager.class);
     CacheStore cs3 = manager2.getCacheStore();
     try {
                   //System.out.println(cs3.containsKey(1)+ "cs3.containsKey(1)");
                     cs3.loadAll();
                     System.out.println(cs3.containsKey(1)+".......cs3.containsKey(1).......");
                     //cs3.load(1);
                     //cs3.
            
      } catch (CacheLoaderException e1) {
                
                 e1.printStackTrace();
        }
                  System.out.println(c.isEmpty());
          
            System.out.println(c.getConfiguration().getCacheLoaders().contains(1)+ "contain a key 1 after ");
                  
          //assert cs2.load(1).
        for (InternalCacheEntry e : c.getAdvancedCache().getDataContainer().entrySet()){
            System.out.println(e.toString());
            System.out.println(e.getKey()+ "printing from internalCachEntry");
           }


}

  • 1. Re: CacheLoader
    Galder Zamarreño Master

    Why on earth have you added a cache store to the Infinispan 2LC??

     

    There's absolutely no need for that. Hibernate manages the 2LC and it talks to the database as well....

     

    Btw, what app server are you running on?