Chapter 5. Hibernate Services

Example Using ServiceRegistryBuilder to Create a ServiceRegistry

ServiceRegistryBuilder registryBuilder =
    new ServiceRegistryBuilder( bootstrapServiceRegistry );
    ServiceRegistry serviceRegistry = registryBuilder.buildServiceRegistry();

Example: Use ServiceRegistryBuilder to Replace an Existing Service with a Custom Service

ServiceRegistryBuilder registryBuilder =
    new ServiceRegistryBuilder(bootstrapServiceRegistry);
registryBuilder.addService(JdbcServices.class, new MyCustomJdbcService());
ServiceRegistry serviceRegistry = registryBuilder.buildServiceRegistry();

public class MyCustomJdbcService implements JdbcServices{

   @Override
   public ConnectionProvider getConnectionProvider() {
       return null;
   }

   @Override
   public Dialect getDialect() {
       return null;
   }

   @Override
   public SqlStatementLogger getSqlStatementLogger() {
       return null;
   }

   @Override
   public SqlExceptionHelper getSqlExceptionHelper() {
       return null;
   }

   @Override
   public ExtractedDatabaseMetaData getExtractedMetaDataSupport() {
       return null;
   }

   @Override
   public LobCreator getLobCreator(LobCreationContext lobCreationContext) {
       return null;
   }

   @Override
   public ResultSetWrapper getResultSetWrapper() {
       return null;
   }
}

Example: Using BootstrapServiceRegistryBuilder

BootstrapServiceRegistry bootstrapServiceRegistry =
    new BootstrapServiceRegistryBuilder()
    // pass in org.hibernate.integrator.spi.Integrator instances which are not
    // auto-discovered (for whatever reason) but which should be included
    .with(anExplicitIntegrator)
    // pass in a class loader that Hibernate should use to load application classes
    .with(anExplicitClassLoaderForApplicationClasses)
    // pass in a class loader that Hibernate should use to load resources
    .with(anExplicitClassLoaderForResources)
    // see BootstrapServiceRegistryBuilder for rest of available methods
    ...
    // finally, build the bootstrap registry with all the above options
    .build();

Example: Registering Event Listeners

public class MyIntegrator implements org.hibernate.integrator.spi.Integrator {

    public void integrate(
            Configuration configuration,
            SessionFactoryImplementor sessionFactory,
            SessionFactoryServiceRegistry serviceRegistry) {
        // As you might expect, an EventListenerRegistry is the thing with which event listeners are registered  It is a
        // service so we look it up using the service registry
        final EventListenerRegistry eventListenerRegistry = serviceRegistry.getService(EventListenerRegistry.class);

        // If you wish to have custom determination and handling of "duplicate" listeners, you would have to add an
        // implementation of the org.hibernate.event.service.spi.DuplicationStrategy contract like this
        eventListenerRegistry.addDuplicationStrategy(myDuplicationStrategy);

        // EventListenerRegistry defines 3 ways to register listeners:
        //     1) This form overrides any existing registrations with
        eventListenerRegistry.setListeners(EventType.AUTO_FLUSH, myCompleteSetOfListeners);
        //     2) This form adds the specified listener(s) to the beginning of the listener chain
        eventListenerRegistry.prependListeners(EventType.AUTO_FLUSH, myListenersToBeCalledFirst);
        //     3) This form adds the specified listener(s) to the end of the listener chain
        eventListenerRegistry.appendListeners(EventType.AUTO_FLUSH, myListenersToBeCalledLast);
    }
}