在Hibernate中提供Session对象的DB管理器有什么好的设计模式？

Question

I'm developing a class that provides a session to any consumer. So, the class is responsible of getting a SessionFactory and opening up a session and passing it whenever needed.

So, What is a better design? Static method in a class like this?

public class DbStatIo {
     private static SessionFactory factory=null;

    public static Session getSessionForStatDb(){
        if (factory==null){
            SessionFactory factory=new Configuration()
            .configure(FilesManager.getSenseiConfigForStatDb())
            .buildSessionFactory();
        }
        return factory.openSession();
    }

}

or just a local public function? Or something else?

Answer 1

The creation of a SessionFactory instance is a very expensive operation due to the amount of information it holds (as shown here ); since it is thread-safe, having a single instance (as a singleton) or keeping a static reference should be sufficient.

However, using it as a singleton might give you better, more flexible control over the lifetime of the object than storing it as a field in static class. You can have a dependency on your data access objects to a IDatabaseService , exposing a method getSession , implemented by a single instance of HibernateService .