On 07/14/2016 12:22 PM, Flores, Paul A. wrote:
Hi,
At client.
Basic questions that I have answered but want to double check.
Can I get some verification/clarification.
How does pre-fetch influence these questions/answers?
Thanks for the feedback it is appreciated.
Paul
Premise:
Given:
a Connection with a Session. (Connection to Session 1:1?)
a Session with more than 1 Receiver. (Session to Receiver 1:N)
Default configuration specifying pre-fetch
Each Receiver has a queue. (Receiver to Queue 1:1)
Questions:
1) Does Next Receiver "cycle" through receivers?
Given:
Three Receivers: A,B and C
Receivers A and C have message on their respective queues (Alpha and
Charlie respectively)
After a fetch on Receiver A (messages remain on Alpha)
Will a call to Next Receiver return Receiver C?
NextReceiver is not directly concerned with whether there are messages
on the queue, but whether there are messages that have been delivered on
the receiver to the client (based on prefetch). So, yes, NextReceiver
will eventually return C even though messages remain on Alpha.
2) Does Next Receiver always return the Receiver with messages on its queue?
Given:
Three Receivers: A,B and C
Receiver B's queue (Bravo) has messages while the other Receiver queues
are empty
After a fetch on Receiver B (messages remain on Bravo)
Will a call to Next Receiver return Receiver B?
NextReceiver _only_ returns receivers on which messages have been
prefetched. So, yes, NextReceiver will return B in this case. Once all
the messages on Bravo are delivered (even if they remain), NextReceiver
will block because there is no receiver with prefetched deliveries to
return.
Note that if there is no prefetch on any of the receivers, NextReceiver
will never return a receiver.
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