Re: [ebxml-dev] Role of message producer in Duplicate detection feature

[Theo Kramer <theo@flame.co.za>]

Hi Jean-Paul

The as4 profile does not provide a 'standard' way of handling duplicates - and unfortunately simply logging duplicates could mean that those cases could end up being lost…

My personal thinking would be to use the notion of idempotency - where the response to a duplicate message (receipt and/or http response) be exactly the same as for the first instance of the received message.

Also duplicate detection for the light/minimal client may also be problematic as these are typically intended for once of pushing and pulling and may therefore not remember state between different pulls...

On 22 Oct 2013, at 12:45 , Jean-Paul Berthelot <Jean.Paul.Berthelot@syncsoft.com.au> wrote:

> Hi all,
>  
> I have a question that would have related to the G series test cases, in particular G.1.1.
>  
> My question is around duplicate detection under AS4.
>  
> In section 3.2 Reception Awareness features and Duplicate Detection, duplicate detection is defined as:
>  
> “Ability for the MSH receiving a User message to detect and/or eliminate duplicates based on eb:MessageInfo/eb:MessageId.
> If duplicates are just detected (not eliminated) then at the very least it is REQUIRED that the Receiving MSH notifies its application (message Consumer) of the duplicates. For examples, these could be logged.
> Related quantitative parameters (time window for the detection, or maximum message log size) are left to the implementation.”
>  
> If a duplicate is detected, should a message be returned to the message producer or no communication with the message producer take place? If a message is to be sent to the message provducer, what type of message should be sent (that is for example an ebms error or SOAP fault returned to the message producer) ?
>  
> Advice would be greatly appreciated.
>  
> Kind regards,
>  
> Jean-Paul Berthelot
> Senior Analyst Programmer
> Oban Pty Ltd | 19-23 Prospect St | Box Hill Vic 3128 | Australia
> t +61 3 9044 1704 | m +61 432 327 799 | f +61 3 9044 1799
> e jean-paul.berthelot@obansolutions.com.au | w www.obansolutions.com.au
> 
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-- 
Regards
Theo