JPAPlugin.java

/**
 * 
 */
package org.minnal.jpa;

import java.util.List;

import javax.persistence.EntityManagerFactory;
import javax.persistence.spi.PersistenceProvider;
import javax.persistence.spi.PersistenceProviderResolverHolder;
import javax.persistence.spi.PersistenceUnitInfo;

import org.activejpa.jpa.JPA;
import org.minnal.core.Application;
import org.minnal.core.MinnalException;
import org.minnal.core.Plugin;
import org.minnal.core.config.ApplicationConfiguration;

/**
 * @author ganeshs
 *
 */
public class JPAPlugin implements Plugin {
	
	private EntityManagerFactory factory;

	public void init(Application<? extends ApplicationConfiguration> application) {
		List<PersistenceProvider> providers = getProviders();
		if (providers == null || providers.isEmpty()) {
			throw new MinnalException("No JPA persistence provider found");
		}
		PersistenceProvider provider = providers.get(0);
		PersistenceUnitInfo info = createPersistenceUnitInfo(application.getConfiguration(), provider); 
		factory = provider.createContainerEntityManagerFactory(info, null);
		JPA.instance.addPersistenceUnit(info.getPersistenceUnitName(), factory);
		application.addListener(new JerseyApplicationEventListener(application.getConfiguration().getDatabaseConfiguration()));
	}

	public void destroy() {
		factory.close(); 
	}

	protected List<PersistenceProvider> getProviders() {
		return PersistenceProviderResolverHolder.getPersistenceProviderResolver().getPersistenceProviders();
	}
	
	protected PersistenceUnitInfo createPersistenceUnitInfo(ApplicationConfiguration configuration, PersistenceProvider provider) {
		return new MinnalPersistenceUnitInfo(configuration.getName(), configuration.getDatabaseConfiguration(), provider);
	}
}