C++ API Next Receiver Questions

["Flores, Paul A." <PA...@SAIC.COM>]

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?



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?






________________________________

This communication (including any attachments) may contain information that is proprietary, confidential or exempt from disclosure. If you are not the intended recipient, please note that further dissemination, distribution, use or copying of this communication is strictly prohibited. Anyone who received this message in error should notify the sender immediately by telephone or by return email and delete it from his or her computer.

Re: C++ API Next Receiver Questions

[Ted Ross <tr...@redhat.com>]

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.

>
>
>
>
>
>
> ________________________________
>
> This communication (including any attachments) may contain information that is proprietary, confidential or exempt from disclosure. If you are not the intended recipient, please note that further dissemination, distribution, use or copying of this communication is strictly prohibited. Anyone who received this message in error should notify the sender immediately by telephone or by return email and delete it from his or her computer.
>

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