org.davesag.generica.servlet.filter
Class PersistenceManagementFilter

java.lang.Object
  org.davesag.generica.servlet.filter.PersistenceManagementFilter

All Implemented Interfaces:

Filter

public class PersistenceManagementFilter

extends Object

implements Filter

Filter which manages a ThreadLocal hibernate session. Obtain the session by calling Persistance.getSession(somesessionfactory).

Since:

Generica 1.0

Version:

CVS Revision $Id: PersistenceManagementFilter.java,v 1.8 2004/03/30 13:00:42 davesag Exp $

Author:

Dave Sag http://www.davesag.com, based on code written by Jeff Schnitzer

Field Summary

protected static ThreadLocal

HIBERNATE Holds the current hibernate session, if one has been created.

Constructor Summary

PersistenceManagementFilter()

Method Summary

void	destroy() does nothing.
void	doFilter(ServletRequest request, ServletResponse response, FilterChain chain) open a new hibernate session if one has not already been opened, and then close it after the request has been handled.
static Session	getSession(SessionFactory factory) Gets a session that will be closed by this filter at the end of the request.
void	init(FilterConfig filterConfig) does nothing.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

HIBERNATE

protected static ThreadLocal HIBERNATE

Holds the current hibernate session, if one has been created.

Constructor Detail

PersistenceManagementFilter

public PersistenceManagementFilter()

Method Detail

init

public void init(FilterConfig filterConfig)
          throws ServletException

does nothing.

Specified by:

init in interface Filter

Parameters:

filterConfig - the filter config object

Throws:

ServletException - if anything went wrong.

doFilter

public void doFilter(ServletRequest request,
                     ServletResponse response,
                     FilterChain chain)
              throws IOException,
                     ServletException

open a new hibernate session if one has not already been opened, and then close it after the request has been handled.

Specified by:

doFilter in interface Filter

Parameters:

request - the http request

response - the http response

chain - the next filter in the chain.

Throws:

IOException - if anything went wrong with io.

ServletException - if anythign else went wrong.

IllegalStateException - if there is already a hibernate session with this thread.

getSession

public static Session getSession(SessionFactory factory)
                          throws HibernateException

Gets a session that will be closed by this filter at the end of the request. NOTE: ONLY ever call this method from within the context of a servlet request (specifically, one that has been associated with this filter). If you want a Hibernate session at some other time, call getSessionFactory() and open/close the session yourself.

Parameters:

factory - The session factory to use to create this session.

Returns:

an appropriate Hibernate Session object.

Throws:

HibernateException - if there was a problem.

destroy

public void destroy()

does nothing.

Specified by:

destroy in interface Filter