Technotrance, Illusions and Perspectives

Recently I have been working on an application involving PrimeFaces and required search capabilities directly on the persisted data. Though I can use Hibernate search for implementing search services, the Google Guice, the underlying IoC framework, which PrimeFaces provide does not provide me the out-of-the-box integration. I am extending from my previous blog post which talked about using Google Guice to inject JPA EntityManager. This post builds on the previous post and explores the option of search. Here are the following sequence of steps I followed to ensure PrimeFaces widgets are Hibernate Search compliant:

1)  Follow the steps mentioned to get an EntityManager instance fro m JBoss Seam’s component xml and register in the Google Guice injector using a Provider  implementation. Make a little change where the Provider’s getter method is made static.  Following is the EntityManagerProvider code snippet to do that:

class EntityManagerProvider implements Provider
{       static EntityManagerFactory entityManagerFactory = null;
        public static EntityManager get()
        {   return entityManagerFactory.createEntityManager();
        }
}

2) Implement Guice injection Provider for constructing a FullTextEntityManager from EntityManager

public class FullTextEntityManagerProvider implements Provider
{    static FullTextEntityManager fullTextManager = null;
     private static EntityManager entityManager;

     public static void setEntityManager(EntityManager em)
     {   entityManager = em;
     }

      public FullTextEntityManager get()
      {   if(fullTextManager==null)
             fullTextManager = Search.getFullTextEntityManager(entityManager);
           return fullTextManager;
      }
}

3) Modify the custom module (now refactored as MySearchEntityManagerModule) to construct the FullTextEntityManager using EntityManager instance as shown below.

public class MySearchEntityManagerModule extends AbstractModule
{      public void configure()
       {   Expressions expressions = Expressions.instance();
           ValueExpression emfVE = expressions.createValueExpression("#{my_persistence_unit}");
           EntityManagerFactory emf = (EntityManagerFactory)emfVE.getValue();
           EntityManagerProvider.setEntityManagerFactory(emf);
           FullTextEntityManagerProvider.setEntityManager(provider.get());

            //bind EntityManager and FullTextEntityManager for both pure database and search specific integration
            bind(EntityManager.class).toProvider(EntityManagerProvider.class).in(Scopes.SINGLETON);
            bind(FullTextEntityManager.class).toProvider(FullTextEntityManagerProvider.class).in(Scopes.SINGLETON);
     }
}

3) Inject the FullTextEntityManager in the dataservice (DAO) for searching for text tokens using Hibernate Search.

@Name("hybrid")
@Guice
public class HybridDAO
{  @Inject FullTextEntityManager searchManager;
    //other DAO methods to perform search using Hibernate Search and Lucene
}

This quick tip provides us a capability of enhancing Primefaces widgets to use the power of Hibernate Search for search and much more extensible features.