add GetN method to retrieve batches of available items #11
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GetN retrieves up to n items that are currently available in the queue. If there are no items currently available, then none are returned and GetN does not wait for any. GetN is used to poll the DSQueue for items and return batches of those items. This is the most efficient way of fetching currently available items. GetN and Out can both be used to read items from the DSQueue, but they should not be used concurrently as items will be returned by one or tha other indeterminately.
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GetNretrieves up to n items that are currently available in the queue. If there are no items currently available, then none are returned andGetNdoes not wait for any.GetNis used to poll theDSQueuefor items and return batches of those items. This is the most efficient way of fetching currently available items.GetNandOutcan both be used to read items from theDSQueue, but they should not be used concurrently as items will be returned by one or the other indeterminately.Closes #10