2008-03-25
采用单态模式保证Hibernate的SessionFactory的单态
SessionFactoryBuilder.java
//由SessionFactoryBuilder的单态来保证SessionFactory的单态
public class SessionFactoryBuilder {
private SessionFactory sessionFactory;
private static SessionFactoryBuilder sfb;
//空的私有构造函数
private SessionFactoryBuilder(){
}
public static SessionFactoryBuilder instance(){
if(sfb==null){
sfb=new SessionFactoryBuilder();
}
return sfb;
}
public SessionFactory getSessionFactory()throws MessageException{
if(sessionFactory==null){
try {
Configuration configuration=new Configuration().configure();
sessionFactory=configuration.buildSessionFactory();
} catch (HibernateException e) {
System.out.println("初始化SessionFactory出现异常......"+e);
throw new MessageException("初始化SessionFactory出现异常......");
}
}
return sessionFactory;
}
}
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