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https://issues.apache.org/jira/browse/QPID-750?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gordon Sim resolved QPID-750.
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Resolution: Fixed
Fix Version/s: M3
By using the SubscriptionManager explicit allocation of credit etc can be
delegated to a utility class. There are also now constants for the magic
numbers.
> MessageFlow needs sensible defaults, defined constants
> ------------------------------------------------------
>
> Key: QPID-750
> URL: https://issues.apache.org/jira/browse/QPID-750
> Project: Qpid
> Issue Type: Improvement
> Components: C++ Client
> Reporter: Jonathan Robie
> Fix For: M3
>
>
> Currently, the C++ client must explicitly allocate credit with messageFlow to
> receive messages, e.g.
> session.messageSubscribe(arg::queue="message_queue",
> arg::destination="listener_destination");
> session.messageFlow(arg::destination="listener_destination",
> arg::unit=0, arg::value=1);//messages ### Define a constant?
> session.messageFlow(arg::destination="listener_destination",
> arg::unit=1, arg::value=0xFFFFFFFF);//bytes ###### Define a constant?
> This complicates introductory examples and simple programs. It would be
> helpful to have a sensible default message flow that is used if the user does
> not explicitly allocate credit. (I am guessing that it's unlikely that
> someone would want to subscribe to a queue and not receive messages, so we
> don't have to worry about this case.)
> Even when explicit control over the number and size of messages received is
> important, there are no defined constants to make it clear what the above
> calls mean. How is the programmer supposed to know that arg::unit=0 in the
> second parameter means setting the number of messages to receive? Defined
> constants would make this code much more readable.
> What guidelines should we give users for the settings of message flow
> parameters in real programs?
> Jonathan
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