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Re: [xmlblaster] Fail Safe for Applets - How?

chris lau wrote:

Hi Marcel,

I spent alot of time thinking about this fail safe stuff. I'm not an experienced java programmer
by any means so how would I go about writing a wrapper class that will do the reconnect? I mean,
what are the steps involved in doing this?

What I was trying to do previously is when the exception is thrown (because the connection went
down), I called a method which would go and try to do a connect. Then I would check isConnected to
see if true and if not wait a while and try again.

Yes, this could be the way in the wrapper.

Note however - you detect a failure not until your applet want to access the server:
If you need to detect missing callback notifications earlier
you need to ping the server to find out there is a problem.


Am I on the right track here?

--- Marcel Ruff <mr at marcelruff.info> wrote:

chris lau wrote:

I used the code from the applet examples as a reference to adding code in my applet to connect


xmlblaster. However, there was a case where the blaster server went down (I closed it
accidentally) and the applet threw an exception. When I started up the server again and


a message (PtP), the applet didn't get any notifications. The only way I got it to receive
messages again was to refresh the webpage which reloaded the applet - which logged in again. In


real life situation, the user wouldn't even know that the connection went down and would be
wondering why there are no notifications coming in.

I looked at some of the fail safe examples in the site and I noticed that none of the classes
needed are in the xmlBlasterAppletLib.jar. Does this mean I can't use them?

If not, is there a way to get some sort of simple fail safe mechanism working?

The primitive applet code has no fail safe features.
You could wrap a class around it which does reconnect for you.
This would be a nice feature to add to our distribution ...



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