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https://issues.apache.org/jira/browse/PROTON-1952?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Stitcher updated PROTON-1952:
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Issue Type: Improvement (was: Bug)
> Add possibility to set link-credit in proton receiver API
> ---------------------------------------------------------
>
> Key: PROTON-1952
> URL: https://issues.apache.org/jira/browse/PROTON-1952
> Project: Qpid Proton
> Issue Type: Improvement
> Components: cpp-binding
> Affects Versions: proton-c-0.22.0
> Reporter: Jeremy
> Priority: Critical
> Labels: reproducer
>
> In the amqp standard,
> [link-credit|http://docs.oasis-open.org/amqp/core/v1.0/cos01/amqp-core-transport-v1.0-cos01.html#doc-flow-control]
> is defined as: "the current maximum legal amount that the delivery-count can
> be increased by". Only the receiver can set its value.
> In the current proton API, we can only add to the link-credit. We cannot set
> it (our need is to set it to a value less than the actual link-credit).
> As to why we need this, we are trying to implement an asynchronous get with
> timeout (by returning a std::future).
> I understand that in the amqp standard, there are 2 supported modes of
> delivery, and async get with timeout is not mentioned:
> * [Synchronous get (with/without
> timeout)|http://docs.oasis-open.org/amqp/core/v1.0/cos01/amqp-core-transport-v1.0-cos01.html#doc-idp494704]
>
> * [Asynchronous
> notifications|http://docs.oasis-open.org/amqp/core/v1.0/cos01/amqp-core-transport-v1.0-cos01.html#doc-idp502800]
> Therefore, we're implementing it for its convenience to us (the client
> receives the response/exception in his thread).
> Problem arises when we start having timeouts. Briefly (I can give you more
> details here if you want), having the ability to set the link-credit to a
> lower value would facilitate our lives.
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