Mark,

Would you please look at changing Vector to ArrayList, and also look at
implementing a cache using a SoftReference?

Use the SoftReference to point to the current member Collection.  Clear it
when subscribing a new member.  To support manual database changes, we can
add an administrative command to also clear the SoftReference.  This would
cut down on user repository operations, and associated heap churning, in an
active mailing list server.

        --- Noel


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