[Fiware-wpa] FIWARE: FMC Block diagrams: Reference_Sheet-Block_Diagram.pdf (application/pdf Object)

[Juanjo Hierro]

Hi,

  IMHO, what they are referring there as "RPC" or "RPC-like" is something open enough so that we can assign it the semantics that better suit to our convenience.  From my point of view, a RESTful interface could be categorized as having RPC-like semantics.   As pointed by Denes, meaning that "Agent A1 can request information from agent A2 which in turn responds (e.g. function calls or http request/responses)" and this is something that you can argue is what actually happens in a RESTful interface.

  Therefore, I agree with Denes here: the R with small arrow simply indicates the direction of the request, in a request-response communication.

  Given said the above, all chapter teams should review their FMC block diagrams to make sure they align with the FMC principles summarized in the sheet distributed by Torsten.   At least full alignment should be achieved by March 6 in the public wiki.

  Hope it helps,

-- Juanjo


On 28/02/12 07:56, Bisztray, Denes (NSN - HU/Budapest) wrote:
Dear Thorsten,

I agree with most of your points, lots of people doing it wrong. However, as far as I understood from the link you just provided the R with small arrow simply indicates the direction of the request-response communication, no RPC is mentioned anywhere. Quoting the pdf “Agent A1 can request information from agent A2 which in turn
responds (e.g. function calls or http request/responses)”.

Best,
Dénes



From: fiware-wpa-bounces at lists.fi-ware.eu<mailto:fiware-wpa-bounces at lists.fi-ware.eu> [mailto:fiware-wpa-bounces at lists.fi-ware.eu] On Behalf Of ext Leidig, Torsten
Sent: Monday, February 27, 2012 5:47 PM
To: fiware-wpa at lists.fi-ware.eu<mailto:fiware-wpa at lists.fi-ware.eu>; fiware-wpl at lists.fi-ware.eu<mailto:fiware-wpl at lists.fi-ware.eu>
Subject: [Fiware-wpa] FIWARE: FMC Block diagrams: Reference_Sheet-Block_Diagram.pdf (application/pdf Object)

http://www.fmc-modeling.org/download/notation_reference/Reference_Sheet-Block_Diagram.pdf

Dear Open Specification Writers,

while having a quick look at different Open Specifications in the private Wiki I noticed that there is some confusion according to the meaning FMC block diagrams.

Please have a look at this cheat sheet. The semantics is actually very simple. However, it would be nice if we can use it consistently across the different Specs.

So for example:


 *   The dotted rounded rectangle means: structure variance (parts of the diagram can be there multiple times, sometimes controlled by an agent.)
 *   If you want to subsume parts of the diagram you should us a plain border box (maybe with a light grey background)
 *   The R with a small arrow means an RPC-like semantics of a channel between two components (agents)
 *   Two components can only be connected via a channel. (no direct lines between them)
 *   A component (agent) can read/write from/to a storage (without a channel in between)


Best regards,

Torsten


Dr. Torsten Leidig
SAP Research Center CEC Karlsruhe
SAP AG
Vincenz-Prießnitz-Str. 1
76131 Karlsruhe
T +49 6227 7 52535
F +49 6227 78 29753
E torsten.leidig at sap.com<mailto:torsten.leidig at sap.com>
http://www.sap.com
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