RE: Please Comment: plan for co-ordinating sessions across mutliple contexts

["Shapira, Yoav" <Yo...@mpi.com>]

Hi,
Can you make this UserDataBean work with Tomcat's SingleSignOn valve?
http://jakarta.apache.org/tomcat/tomcat-5.0-doc/config/host.html#Single%
20Sign%20On

Yoav Shapira
Millennium ChemInformatics


>-----Original Message-----
>From: Justin Johnson [mailto:justinj@irisusainc.com]
>Sent: Wednesday, March 10, 2004 10:58 AM
>To: 'Tomcat Users List'
>Subject: Please Comment: plan for co-ordinating sessions across
mutliple
>contexts
>
>I have an internal website with several web applications, and thus
several
>contexts.  The user's identity is automatically provided via jCIFs
(NTLM
>authentication).  At the start of a session, a UserDataBean is created
that
>loads user preferences from a database, including the language
preference
>for the user (the site is English/Japanese bilingual).
>
>I've implemented a site-wide filter that checks for changes to
preferences
>sent as a querystring by clicking a link (e.g., clicking on the
'nihon-go'
>link in the main menu sends the URL [current path]?Language=JA).  The
>filter
>catches the change, calls the change method in the session's
UserDataBean,
>which changes the preference and updates the database.
>
>The experienced among you have already spotted the problem: with
multiple
>contexts there are multiple sessions for the user, and multiple
>UserDataBeans; changing a preference in one bean doesn't change the
>preference in another bean, which has already populated its fields from
the
>database.  Switch to Japanese in one context, and the change isn't
>reflected
>in another.
>
>What I think will work is the create a UserDataBeanEvent that is
broadcast
>on changing a preference; all the other beans listen for that event,
and on
>receiving one, check if that event was sent by a bean for the same user
as
>the receiving UserDataBean; if it was, it can update its own fields to
the
>same value (without bothering to update the database since the
broadcasting
>bean did so), and so all the UserDataBeans are co-ordinated across
multiple
>contexts.
>
>Does this seem workable?  Am I forgetting something, or am I missing
>something about performance?  Is there a lighter-weight way to
accomplish
>the same thing?
>
>Thanks,
>Justin
>
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