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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DISPATCH-89) Model the legacy topic exchange behavior of qpidd
Date Tue, 23 Jan 2018 19:05:00 GMT

    [ https://issues.apache.org/jira/browse/DISPATCH-89?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16336250#comment-16336250
] 

ASF GitHub Bot commented on DISPATCH-89:
----------------------------------------

Github user ssorj commented on a diff in the pull request:

    https://github.com/apache/qpid-dispatch/pull/244#discussion_r163344546
  
    --- Diff: python/qpid_dispatch/management/qdrouter.json ---
    @@ -1126,6 +1126,106 @@
                 }
             },
     
    +        "router.config.exchange": {
    +            "description":"[EXPERIMENTAL] Defines a topic exchange.",
    +            "extends": "configurationEntity",
    +            "operations": ["CREATE", "DELETE"],
    +            "attributes": {
    +                "address": {
    --- End diff --
    
    I think address on router.node should change to "addr".  It's the only outlier.  The rest
of the config is using "addr" consistently.
    
    Side note: "address" for one address and "addr" for multiple addresses is an automatic
user gotcha.  There is zero help for the user in those names.
    
    And data point: The doc for "addr" on autoLink says it is just one address.


> Model the legacy topic exchange behavior of qpidd
> -------------------------------------------------
>
>                 Key: DISPATCH-89
>                 URL: https://issues.apache.org/jira/browse/DISPATCH-89
>             Project: Qpid Dispatch
>          Issue Type: New Feature
>          Components: Routing Engine
>    Affects Versions: 0.2
>            Reporter: Ken Giusti
>            Assignee: Ken Giusti
>            Priority: Major
>
> With Qpidd, a user can define a binding from an Exchange to a target queue.  The binding
uses a key that is compared to a message's subject field.  If the key matches, the message
is routed to the target queue for that binding.
> It should be possible to emulate this behavior using the dispatch router.
> Example:
> User defines a mappings from a target address (the 'exchange') to a different target
address(es) (the 'queue').  These mappings (the 'bindings') are driven by a pattern match
against the inbound message's subject field.
> Messages arriving at the router from any link whose target address has bindings defined
are not immediately routed.  Prior to routing, the message's subject field is extracted and
compared against each binding defined for the target.  A list of new target addresses is created
containing the target address from each binding that satisfied the pattern match.  The message
is then routed to each new target address.
> The pattern syntax should be the same 'dotted string' notation from qpidd, including
'*' and "#' wildcarding.



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