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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Dear all,<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 lang="EN-US" 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 style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" 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 lang="EN-US" 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 lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif">I see 3 possibilities:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l1 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"><span style="mso-list:Ignore">a)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" 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></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l1 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"><span style="mso-list:Ignore">b)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" 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></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l1 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"><span style="mso-list:Ignore">c)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" 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></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" 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 lang="EN-US" 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 lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><![if !supportLists]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"><span style="mso-list:Ignore">1)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif">ESA creates aggregation GreatAggreg = [param1, param2, param10]<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><![if !supportLists]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"><span style="mso-list:Ignore">2)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" 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></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><![if !supportLists]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"><span style="mso-list:Ignore">3)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif">CNES creates the aggregation GreatAggreg = [param12,param3]<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><![if !supportLists]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"><span style="mso-list:Ignore">4)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" 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></p>
<p class="MsoListParagraph" style="margin-left:54.0pt"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="margin-left:54.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo3">
<![if !supportLists]><span lang="EN-US" style="font-size:10.0pt;font-family:Wingdings"><span style="mso-list:Ignore">đ<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" 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></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" 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 lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif">Best regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif">Olivier<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" 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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<p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#005191;letter-spacing:.6pt;mso-fareast-language:FR">Architecte Segment Sol d'Opération<o:p></o:p></span></b></p>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#005191;letter-spacing:.6pt;mso-fareast-language:FR">Sous-Direction Opérations,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#005191;letter-spacing:.6pt;mso-fareast-language:FR">Service Développement de Segments Sol d’Opérations<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#005191;letter-spacing:.6pt;mso-fareast-language:FR">18 avenue Edouard Belin 31401 Toulouse Cedex 9<o:p></o:p></span></p>
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(0)5 61 28 19 08</span><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#005191;mso-fareast-language:FR"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#005191;mso-fareast-language:FR"><img width="10" height="10" style="width:.1041in;height:.1041in" id="Image_x0020_3" src="cid:image017.png@01D9930A.3C6FB490"> </span><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#005191;mso-fareast-language:FR">olivier.churlaud@cnes.fr</span><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#005191;mso-fareast-language:FR">
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<o:p></o:p></span></p>
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