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From Vernon Wu <>
Subject Re: User Notification
Date Mon, 23 Sep 2002 19:58:23 GMT

I don't follow you. Can you explain with more details?

9/23/2002 3:55:04 PM, Eddie Bush <> wrote:

>Yeah you could persist it to a DB though and show the message from the 
>DB when they ask to do that... and just rely on your 
>session-manager-thingie for notification.
>James Higginbotham wrote:
>>Ok, then you could use JMS to store a message in a topic and check for
>>it on each request to show the user an indicator if a message exists.
>>But, unless you turn off persistence for the topic, you will be using a
>>DB on the backend anyway. And a query against a DB on a field that is
>>indexed (such as the userid) would be very fast. 
>>The other option (assuming you are using only 1 server or have sticky
>>sessions in place) is to create a session manager that you store these
>>messages in a list, stored in a hash keyed by user id. It would probably
>>be a singleton within the app server's VM. You would then check this
>>manager on each request and show the indicator/message as appropriate.
>>Just attach a session listener so that when the user's session times out
>>or you kill it forcefully, your session manager will drop any existing
>>messages. Course, this isn't persistent so if the user isn't signed in,
>>they will never get the message (thus, see option 1 and previous posts
>>to this list). 
>Eddie Bush
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