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https://issues.apache.org/jira/browse/PROTON-2370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17320528#comment-17320528
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ASF GitHub Bot commented on PROTON-2370:
----------------------------------------
jiridanek commented on a change in pull request #309:
URL: https://github.com/apache/qpid-proton/pull/309#discussion_r612761509
##########
File path: cpp/src/delivery.cpp
##########
@@ -40,6 +42,7 @@ namespace proton {
delivery::delivery(pn_delivery_t* d): transfer(make_wrapper(d)) {}
receiver delivery::receiver() const { return make_wrapper<class
receiver>(pn_delivery_link(pn_object())); }
+tag delivery::tag() const { return make_wrapper<class
tag>(pn_delivery_tag(pn_object())); }
Review comment:
I think so. If you look at the tests that @pjfawcett wrote for these two
enhancements
https://github.com/apache/qpid-proton/pulls?q=is%3Apr+author%3Apjfawcett ,
you'll see that there are tests that set something when a message is being
sent/link is being created/... and then the tests check it on the receiving
end. **I think that this would be a good test in addition to what you have
already. It demonstrates that an end-user of the library is actually able to
use the tags.**
As you know, in AMQP you can set a tag when you are sending a message and
you will see the tag in the receiver when your program decides whether to
accept the message, and then again the tag is given back to the sender in the
delivery after the message has been disposed of.
Looking at the C++ binding, I see that when I send a message, I won't be
able to set my own tag, because the binding sets it for me (and tries
moderately hard to give unique tag). For example, in the Python binding, there
is `def send(self, sender, tag=None):` method in `message.py` so there I can
set my own tag.
https://github.com/apache/qpid-proton/blob/8ddf5399013b02f1fd13bda3fee7886bd48a98be/cpp/src/sender.cpp#L62-L72
When I receive the message, I will be able to read the delivery tag in the
`on_message` handler method
https://github.com/apache/qpid-proton/blob/8ddf5399013b02f1fd13bda3fee7886bd48a98be/cpp/examples/flow_control.cpp#L181
Finally, when the message is settled in the `on_message` handler of the
receiver (using one of the `.accept()`, `reject()`, ... methods, I want to be
able to see in the sender the final disposition and the tag. That should cause
the handler method `on_tracker_accept`/`on_tracker_reject`/... to be called.
**Problem is, I cannot access the delivery and therefore the delivery tag from
that method, at least I did not see a way!**
https://github.com/apache/qpid-proton/blob/8ddf5399013b02f1fd13bda3fee7886bd48a98be/cpp/examples/direct_send.cpp#L76
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> [cpp] An accessor for the delivery tag
> --------------------------------------
>
> Key: PROTON-2370
> URL: https://issues.apache.org/jira/browse/PROTON-2370
> Project: Qpid Proton
> Issue Type: Improvement
> Components: cpp-binding
> Reporter: Justin Ross
> Priority: Major
>
> *Assignee: Rakhi*
> Steps:
> * Get familiar with the AMQP idea of a delivery tag
> * Add a delivery tag accessor to the C++ delivery class
> * Document the accessor in the C++ header
> * Add a test for the accessor to the C++ test suite
> Resources:
> *
> [http://docs.oasis-open.org/amqp/core/v1.0/os/amqp-core-transport-v1.0-os.html#doc-idp438000]
> *
> [http://docs.oasis-open.org/amqp/core/v1.0/os/amqp-core-transport-v1.0-os.html#type-delivery-tag]
> *
> [https://github.com/apache/qpid-proton/blob/main/c/include/proton/delivery.h#L106]
> *
> [https://github.com/apache/qpid-proton/blob/main/cpp/include/proton/delivery.hpp]
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