Home > Guides > Core Developers Guide > Interceptors > Non-IoC version of OpenSessionInViewInterceptor |
Gary was so kind to provide us a non-IoC Hibernate 'Open Session in View'-interceptor. Rather than having XWork or Spring doing the dependency injection, he sets up the Hibernate Session himself.
/* * HibernateOpenSessionInViewInterceptor.java * * Created on March 18, 2006, 3:51 PM * * To change this template, choose Tools | Template Manager * and open the template in the editor. */ package edu.washington.javawebdevelopment.webwork.interceptor; import com.opensymphony.xwork.ActionInvocation; import com.opensymphony.xwork.interceptor.AroundInterceptor; import edu.washington.javawebdevelopment.dao.DaoFactoryHibernate; import javax.servlet.ServletException; import org.hibernate.SessionFactory; import org.hibernate.StaleObjectStateException; /** * * @author gary */ public class HibernateOpenSessionInViewInterceptor extends AroundInterceptor { private SessionFactory hibernateSessionFactory; public void init() { System.out.println("Initializing HibernateOpenSessionInViewInterceptor interceptor, obtaining Hibernate SessionFactory from DaoFactoryHibernate"); hibernateSessionFactory = DaoFactoryHibernate.getSessionFactory(); } public void destroy() { } public void before(ActionInvocation invocation) throws Exception { System.out.println("Starting a database transaction in the HibernateOpenSessionInViewInterceptor"); hibernateSessionFactory.getCurrentSession().beginTransaction(); } public void after(ActionInvocation invocation, String result) throws Exception { // Commit and cleanup try { System.out.println("Committing the database transaction in the HibernateOpenSessionInViewInterceptor"); hibernateSessionFactory.getCurrentSession().getTransaction().commit(); } catch (StaleObjectStateException staleEx) { System.err.println("This interceptor does not implement optimistic concurrency control!"); System.err.println("Your application will not work until you add compensation actions!"); // Rollback, close everything, possibly compensate for any permanent changes // during the conversation, and finally restart business conversation. Maybe // give the user of the application a chance to merge some if his work with // fresh data... what you do here depends on your applications design. throw staleEx; } catch (Throwable ex) { // Rollback only ex.printStackTrace(); try { if (hibernateSessionFactory.getCurrentSession().getTransaction().isActive()) { System.out.println("Trying to rollback database transaction after exception"); hibernateSessionFactory.getCurrentSession().getTransaction().rollback(); } } catch (Throwable rbEx) { System.err.println("Could not rollback transaction after exception! - " + rbEx); } // Let others handle it... maybe another interceptor for exceptions? throw new ServletException(ex); } } }