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Posted to dev@qpid.apache.org by "Rob Godfrey (JIRA)" <ji...@apache.org> on 2017/06/06 09:59:18 UTC
[jira] [Commented] (QPID-7649) [Java Broker] Support the receipt of
AMQP 1.0 Attach with incomplete-unsettled=true
[ https://issues.apache.org/jira/browse/QPID-7649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16038508#comment-16038508 ]
Rob Godfrey commented on QPID-7649:
-----------------------------------
So, one use case that comes to mind for which the use of this flag would prove useful:
"persistent" assignment of messages for REST-like APIs for consumers
Imagine the link as a resource. You can POST credit to the link. A link with credit can then have message resources as children. These messages have essentially been assigned to the link. Once messages are assigned to you you want to be able to GET it as many times as you like. At some point you want to POST to accept it. Each GET / POST might be on a different connection. In the case of a GET that means you need to be able to re-send the message content
To achieve this we could set up a durable link with a default outcome of "RECEIVED". Assigned messages will be in the unsettled map with this state. When a connection is made, case the "client" resumes first with an empty, but incomplete unsettled map. The server then sends the unsettled map, listing all the messages which have been assigned but not accepted. The two detach, then the client attaches with an unsettled map that matches the server's - i.e. asking the server to resend all the assigned (but not accepted) messages.
> [Java Broker] Support the receipt of AMQP 1.0 Attach with incomplete-unsettled=true
> -----------------------------------------------------------------------------------
>
> Key: QPID-7649
> URL: https://issues.apache.org/jira/browse/QPID-7649
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Reporter: Lorenz Quack
> Fix For: qpid-java-broker-7.0.0
>
>
> The AMQP 1.0 spec (2.7.3) allows to send an Attach with an incomplete {{unsettled}} map together with {{incomplete-unsettled=true}}. This is useful in cases where the unsettled map is too large to fit in a single frame.
> We currently do not respect this, violating the spec.
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