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<p class="MsoNormal">I may not be understanding all of the implications of this, but this appears to be an issue of CM and version control.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If these objects are effectively global in nature then I believe that this CM and version control needs to be done globally. If it is “localized” in some way, relative to a system, then I believe that the CM needs to be handled local to
that deployment. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">To not handle CM and versioning, and to allow any system element to delete, redefine, etc elements without control or marking that this had occurred seems to me like a recipe for disaster.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Note that I am assuming that this redefinition implies changing type, number, or order of formal parameters. It does not imply that the values of these parameters cannot be changed.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards, Peter<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span lang="FR" style="font-size:12.0pt;color:black">From:
</span></b><span lang="FR" style="font-size:12.0pt;color:black">MOIMS-SC <moims-sc-bounces@mailman.ccsds.org> on behalf of MOIMS-SC MOIMS-SC <moims-sc@mailman.ccsds.org><br>
<b>Reply-To: </b>Churlaud Olivier <Olivier.Churlaud@cnes.fr><br>
<b>Date: </b>Tuesday, May 30, 2023 at 6:20 AM<br>
<b>To: </b>MOIMS-SC MOIMS-SC <moims-sc@mailman.ccsds.org><br>
<b>Subject: </b>[EXTERNAL] [Moims-sc] [MOv2] Removing a MAL object: precision needed<o:p></o:p></span></p>
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<div>
<p class="MsoNormal"><span lang="FR"><o:p> </o:p></span></p>
</div>
<p class="MsoNormal"><span lang="FR" style="font-size:10.0pt;font-family:"Arial",sans-serif">Dear all,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR" style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">I just finished a telecon with Serge about some expected behaviors in the Aggregation service, and it appears that we have a hole somewhere that would need precision.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR" style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">We often define operations in services that add and remove MAL objects.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">What happens if I remove a MAL object and add another one with the same KEY ?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">I see 3 possibilities:<o:p></o:p></span></p>
<ol style="margin-top:0in" start="1" type="a">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo2"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">It’s not authorized : the key is lost forever and thus…..the provider needs a database with all existing keys of the world<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo2"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">It’s authorized but the version must be bumped so that a consumer knows that something happened with it. The provider
needs a database with all existing keys and their current version. It means also that add/remove operations are rather upgrade/disable.<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo2"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">It’s authorized and the key is initialized to 1. The risk is that the consumer loses its mind, specifically in multi-users
scenarios, but everythink is way simpler<o:p></o:p></span></li></ol>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">I would vote for (c) that is simplier in all ways and would only need to add a sentence in the bluebook.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">In this case, it means that this scenario is possible:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo4"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">ESA creates aggregation GreatAggreg = [param1, param2, param10]<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo4"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Someone (ESA, CNES or another teamplayer) deletes the aggregation GreatAggreg<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo4"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">CNES creates the aggregation GreatAggreg = [param12,param3]<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo4"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">ESA receives an aggregation GreatAggreg and is not able to understand it.<o:p></o:p></span></li></ol>
<p class="MsoListParagraph" style="margin-left:.75in"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:.25in;mso-list:l2 level1 lfo6"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">ESA’s software (and every multi-player software) has to be robust to this case or have implementation specific code
to forbid it.<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Do you have opinions about this?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Best regards<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Olivier<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:FR"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#005191;mso-fareast-language:FR">Olivier CHURLAUD<o:p></o:p></span></b></p>
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