In a session I'd have a Set<String> of logins that are currently
trying to register.
Upon user finishing typing in the login I'd pass that login to
session's reserve() method which should do the following
– check that the login is not in the Set<String>
– check that the login is not associated with any User by calling the
findByLogin method on a vault.
– put the login into the Set<String> if above passes.
Alex
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