Re: EnterSitemapEventListener

[Patrick Heiden <pa...@gmx.de>]

> Is there any documentation available about usage of
> EnterSitemapEventListener?

OK, maybe it would be helpfull to state the goals I want to achieve.
I read [1] and want/have to implement the OpenSessionInViewFilter/Interceptor for myself. Unfortunately for me, Robin left no results within his discussion ;)

So my basic idea/workflow is somewhat 'straightforward' (see [2], too):

1. Open Hibernate Session and bind it to the current thread:
   
   Session sess = sessionFactory.openSession();
   sess.beginTransaction();
   
   //Bind the Session to the current thread/transaction
   TransactionSynchronizationManager.
         bindResource(sessionFactory, new SessionHolder(sess));
   
   //Activate transaction synchronization for the current thread.
   TransactionSynchronizationManager.initSynchronization();

Springs TransactionSynchronizationManager comes into play directly, because  otherwise calls to getCurrentSession() would throw Exception, because LocalSessionFactory proxies Hibernate SessionFactory (in short: you have to tell what current session-context is).

2. render the view

3. commit the Session and close it (unbind it from the current Thread, too. Code example yould be found at [2])

Hopefully (as Robin stated) this won't breake calls to other sitemaps, but I would guess it wouldn't. Second idea behind that approach (away from Springs OSIV) is to use that as codebase to also implement the long-conversation-pattern and store Hibernates Session inside a users HttpSession.

And here I am left with no documentation about the Sitemap-Listeners. E.g. is the HttpSession available, or to be general, wich Objects are available inside those Listeners? I would think, that SitemapEvent.getEnvironment() would always return a HttpEnvironment at runtime, right? If so, the session could be retrieved by 

ObjectModelHelper.getRequest(sitemapEvent.getEnvironment().getObjectModel()).getSession()

Still right? This is the only way I've seen so far.

So maybe there is some hidden documentation available for those Listeners, or comments on what I've tried to explain ;)

Best greetings,
Patrick

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Re: EnterSitemapEventListener

[Patrick Heiden <pa...@gmx.de>]

Hi Robin!

Much thanks for that!!

Finally I went down a different road, too ;) I followed Jörgs taste from [1] and started reusing declarative transaction management (TM). This is for the cost of prinitializing much stuff (objects with collections and the like), but I do not have to worry about OSIV or more worse, long-conversation-Impl any more ;)

I think the design is much cleaner, since TM is solely within my domain-layer (or application layer for common vocabulary ;)

But if I get frustrated with that in future, I am now able to user your approach as well - THANKS again !!

Greetings,
Patrick
[1] http://forum.springframework.org/showthread.php?t=32270&page=2

-------- Original-Nachricht --------
> Datum: Fri, 2 May 2008 10:39:55 +0100
> Von: Robin Wyles <ro...@robinwyles.com>
> An: users@cocoon.apache.org
> Betreff: Re: EnterSitemapEventListener

> Hi Patrick,
> 
> I've been away, so I'm sorry I didn't see this post earlier. I am  
> very busy at the moment, so please also excuse my brief reply!
> 
> It's been a while since I looked at this, and in fact in the end we  
> went down a radically different route on this project that didn't  
> need this approach. However, before this departure, I'm pretty sure I  
> managed to get all this to work. Attached is the relevant sitemap  
> listener - I hope it's of some use.
> 
> Regards,
> 
> Robin
> 

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Re: EnterSitemapEventListener

[Robin Wyles <ro...@robinwyles.com>]

Hi Patrick,

I've been away, so I'm sorry I didn't see this post earlier. I am  
very busy at the moment, so please also excuse my brief reply!

It's been a while since I looked at this, and in fact in the end we  
went down a radically different route on this project that didn't  
need this approach. However, before this departure, I'm pretty sure I  
managed to get all this to work. Attached is the relevant sitemap  
listener - I hope it's of some use.

Regards,

Robin