> Retrieving that information can be very expensive for anything other than
> the JPA and In-Memory mechanisms, and in some cases impossible without
> actually explicitly storing that information (i.e. Memcached).

Can you explain why MemCacheTicketRegistry#getTickets() isn't
supported?  I can't imagine any fundamental reason that a cache system
wouldn't support some kind of iteration as needed here.  That's not to
say that Memcached does in fact support iteration over cache entries,
but that it ought to.

I would like to see a query API be exposed by the ticket storage
components to support use cases like this.  Is a query interface to
SessionStorage a reasonable feature for 4.0?

M

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