Portlets and stateful protocol

[Michael Gustav Simon <mg...@gmail.com>]

Hallo j2-Users,
a portlet is presented in the vm once (singleton).
HTTP is stateless, singleton is a good idea, but ...
How do I can realize a portlet, if i need a stateful protocol like for a
chat?

mgsimon

Re: Portlets and stateful protocol

[Michael Gustav Simon <mg...@gmail.com>]

aaron,
many thanks for this great hint!

Re: Portlets and stateful protocol

[Aaron Evans <aa...@yahoo.ca>]

Michael Gustav Simon <mgsimon <at> gmail.com> writes:

> 
> Have anyone an ideo to get a portletinstance per user?
> 

Michael,
you *really* would not want this.  This approach would never scale and this is
exactly why there is only one portlet instance per VM (actually, this isn't 
quite correct, as you can configure multiple instances, but the point is that
it is not on a per-user basis).

However, there is the portlet session, and this is one-to-one with portlet users.

I think what you really want to do is create a singleton service that would 
manage the mapping of user sessions to "chat connections" or what ever.  The
portlet would then use this service to determine what traffic belongs to the 
logged in user.

Just remember to make your service thread-safe!

HTH,
aaron



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Re: Portlets and stateful protocol

[Michael Gustav Simon <mg...@gmail.com>]

Have anyone an ideo to get a portletinstance per user?

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Re: Portlets and stateful protocol

[Michael Gustav Simon <mg...@gmail.com>]

But if this portlet needs a peer to peer connection to the backend for this
service,
i have one portlet instance in the vm only?

Re: Portlets and stateful protocol

[Philip Mark Donaghy <ph...@gmail.com>]

On 1/24/06, Michael Gustav Simon <mg...@gmail.com> wrote:
> Hallo j2-Users,
> a portlet is presented in the vm once (singleton).
> HTTP is stateless, singleton is a good idea, but ...
> How do I can realize a portlet, if i need a stateful protocol like for a
> chat?

Hi, I guess that you might need a good rich client library so that
your chat could be developed using AJAX. Where your browser requests
conversations from the server and the browser does not change pages.
This may work but chat usually uses a peer to peer mechanism.
Otherwise the Portlet itself is like a servlet. They are thread safe
if programmed correctly. As with servlets, portlets can maintain state
using session attributes.

>
> mgsimon
>
>


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