The ConcurrencyThrottleInterceptor is a great bit of stuff to limit your use of heavy weight resources.
Use it simply by creating the bean:
Then weaving an aspect
However there is an important thing to note, which may-or-may not be completely obvious... the singleton must be set to false, otherwise you are saying that only a certain number of simultaneous invocations are allowed for all the beans you list, not just for each one individually.
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