Re: WebSocket Filter to open a Hibernate Session

[Marco Springer]

Hi Martin,

That's something I figured out as well, the bypassing of the Filters by 
WebSocket requests.

I did as you said and implemented a custom IRquestCycleListener to 
respond on the onBeginRequest & onEndRequest in case there is a 
WebSocketRequest.
This is working correctly now! Thanks for the pointer.

One other question though, since this seems awfully similar to how OSIV 
works.
If I do not filter on WebSocketRequest and allow the Session opening for 
each incoming request, in theory I should not need to apply the 
"OpenSessionInViewFilter" anymore correct?

But then another thing I noticed...
I set a debug point inside the onBeginRequest & onEndRequest to see 
what's is passing through those functions.
Apparently for a single page request the onBeginRequest & onEndRequest 
are called multiple times while I have no Lazy Loading components on that 
page.
My guess would be that those multiple requests are for the resources that 
needed to be loaded, e.g. images/js/css/whatever.
In that respect, it would absolutely not be wise to use that to open & close 
hibernate sessions ;-)

Upon a WebSocket event, the onBeginRequest & onEndRequest are called 
only once, so that's correct.

Again thanks.

Best Regards,
Marco Springer

On Tuesday 15 September 2015 18:06:51 Martin Grigorov wrote:
> Hi,
> 
> Servlet Filters are not used when sending messages in web socket
> connection. This is how Servlets work at the moment.
> 
> You can use Wicket's IRequestCycleListener's 
onBeginRequest/onEndRequest.
> 
> Martin Grigorov
> Wicket Training and Consulting
> https://twitter.com/mtgrigorov
> 
> On Tue, Sep 15, 2015 at 4:32 PM, Marco Springer  
wrote:
> > Hi,
> > 
> > Using normal requests and long-polling ajax timers to update an 
interface
> > works fine with hibernate sessions.
> > Now I'm trying to implement WebSockets to update small parts of a 
web
> > application that come from server side events. I want to get rid of the
> > long
> > polling.
> > 
> > For now I'm only using a @Scheduled annotation to broadcast an 
event to
> > all attached clients. As a simple scenario.
> > 
> > The web application should, in response, update with loading new 
data
> > from a database using Hibernate.
> > 
> > This is where it fails, giving the message:
> > /Caused by: org.hibernate.HibernateException: No Hibernate Session
> > bound to thread, and configuration does not allow creation of non-
> > transactional one here/
> > 
> > I know this fails due to the fact that WebSocket events don't go 
through
> > the normal filters, e.g. OpenSessionInViewFilter that I'm using.
> > 
> > 
> > *My question:*
> > Where can I create a hook where I can start the Hibernate Session 
the
> > same way the OpenSessionInViewFilter does?
> > 
> > If I'm totally off with my thoughts, I'd like to hear that too :)
> > 
> > Used libraries:
> > wicket 6.19.0
> > wicket-sprint 6.19.0
> > wicket-native-websocket-jetty9 6.19.0
> > hibernate 3.6.10-Final
> > springframework 3.2.13-RELEASE
> > (Why the old Hibernate/Spring versions: haven't had time to migrate 
yet,
> > too much to do!)
> > 
> > Thank you very much in advance.
> > 
> > Best regards,
> > Marco Springer

Re: WebSocket Filter to open a Hibernate Session

[Martin Grigorov]

Hi,

Servlet Filters are not used when sending messages in web socket
connection. This is how Servlets work at the moment.

You can use Wicket's IRequestCycleListener's onBeginRequest/onEndRequest.

Martin Grigorov
Wicket Training and Consulting
https://twitter.com/mtgrigorov

On Tue, Sep 15, 2015 at 4:32 PM, Marco Springer  wrote:

> Hi,
>
> Using normal requests and long-polling ajax timers to update an interface
> works fine with hibernate sessions.
> Now I'm trying to implement WebSockets to update small parts of a web
> application that come from server side events. I want to get rid of the
> long
> polling.
>
> For now I'm only using a @Scheduled annotation to broadcast an event to
> all attached clients. As a simple scenario.
>
> The web application should, in response, update with loading new data
> from a database using Hibernate.
>
> This is where it fails, giving the message:
> /Caused by: org.hibernate.HibernateException: No Hibernate Session
> bound to thread, and configuration does not allow creation of non-
> transactional one here/
>
> I know this fails due to the fact that WebSocket events don't go through
> the normal filters, e.g. OpenSessionInViewFilter that I'm using.
>
>
> *My question:*
> Where can I create a hook where I can start the Hibernate Session the
> same way the OpenSessionInViewFilter does?
>
> If I'm totally off with my thoughts, I'd like to hear that too :)
>
> Used libraries:
> wicket 6.19.0
> wicket-sprint 6.19.0
> wicket-native-websocket-jetty9 6.19.0
> hibernate 3.6.10-Final
> springframework 3.2.13-RELEASE
> (Why the old Hibernate/Spring versions: haven't had time to migrate yet,
> too much to do!)
>
> Thank you very much in advance.
>
> Best regards,
> Marco Springer
>
>
>

WebSocket Filter to open a Hibernate Session

[Marco Springer]

Hi,

Using normal requests and long-polling ajax timers to update an interface 
works fine with hibernate sessions.
Now I'm trying to implement WebSockets to update small parts of a web 
application that come from server side events. I want to get rid of the long 
polling.

For now I'm only using a @Scheduled annotation to broadcast an event to 
all attached clients. As a simple scenario.

The web application should, in response, update with loading new data 
from a database using Hibernate.

This is where it fails, giving the message:
/Caused by: org.hibernate.HibernateException: No Hibernate Session 
bound to thread, and configuration does not allow creation of non-
transactional one here/

I know this fails due to the fact that WebSocket events don't go through 
the normal filters, e.g. OpenSessionInViewFilter that I'm using.


*My question:*
Where can I create a hook where I can start the Hibernate Session the 
same way the OpenSessionInViewFilter does?

If I'm totally off with my thoughts, I'd like to hear that too :)

Used libraries:
wicket 6.19.0
wicket-sprint 6.19.0
wicket-native-websocket-jetty9 6.19.0
hibernate 3.6.10-Final
springframework 3.2.13-RELEASE
(Why the old Hibernate/Spring versions: haven't had time to migrate yet, 
too much to do!)

Thank you very much in advance.

Best regards,
Marco Springer