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return, then instantiate?  RSS feed

 
Christopher Lombardi
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Hello.
Would like to create an EJB that uses a singleton pattern.
I have a slight twist on it however. The instantiation process
is terribly long, and I would not like the EJB clients to wait for the instantiation.
I would like the flow to go like this:
If the data is current, return the data.
If a refresh of data is in progress, return false.
If the data is expired, return false to the EJB client, and then kick off a refresh of the data.
The first two items are easy, the third, I cannot figure out how to do with the j2ee threading restriction.
Is there any way to do this?
Thanks much!
Christopher

 
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