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<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Hi Radovan,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Thanks for the thorough answer. Truth be known, I was expecting to receive it from you
</span><span lang="EN-US" style="font-family:Wingdings;color:#1F497D">J</span><span lang="EN-US" style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#1F497D;mso-fareast-language:RU">__________________________<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#1F497D;mso-fareast-language:RU"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Segoe UI",sans-serif;color:#1F497D;mso-fareast-language:RU">Ilya Dorofeev<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="color:windowtext;mso-fareast-language:RU">From:</span></b><span style="color:windowtext;mso-fareast-language:RU"> midPoint [mailto:midpoint-bounces@lists.evolveum.com]
<b>On Behalf Of </b>Radovan Semancik<br>
<b>Sent:</b> Thursday, June 23, 2016 2:10 PM<br>
<b>To:</b> midpoint@lists.evolveum.com<br>
<b>Subject:</b> Re: [midPoint] Projector waves<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi,<br>
<br>
There are several reasons. But perhaps the most important is provisioning dependencies:
<a href="https://wiki.evolveum.com/display/midPoint/Provisioning+Dependencies">https://wiki.evolveum.com/display/midPoint/Provisioning+Dependencies</a><br>
Resources (or even projections) with dependencies need to be processed sequentially. Outbound expression of a dependent projection needs to be reflected in the input of the "dependee" projection. So our solution is to sort the projections into waves. All the
independent projections are processed in the first wave, all the dependent in second wave, all that depends on those in third wave and so on.<br>
<br>
The other reason is that there are also attributes that the resource sets or changes by itself (we call them "volatile attributes"). So after provisioning an account we need to re-read that account and apply inbound expressions to make sure that these volatile
attribute are correctly applied to the focal object (e.g. user). Therefore even if there are no dependencies there is always a "half-wave" at the end of every projector run to make sure that provisioning side-effects are processed correctly.<br>
<br>
Overall, I'm more than aware that the waves are not an ideal way how to process this partially parallel partially sequential computation. A parallel tree-like approach would be much more appropriate. But also much more complex and significantly harder to debug.
Therefore we have decided to go with waves at the beginning and change the implementation to a tree-based processing when needed.<br>
<br>
<br>
<span style="font-size:12.0pt;mso-fareast-language:RU"><o:p></o:p></span></p>
<pre>-- <o:p></o:p></pre>
<pre>Radovan Semancik<o:p></o:p></pre>
<pre>Software Architect<o:p></o:p></pre>
<pre>evolveum.com<o:p></o:p></pre>
<p class="MsoNormal"><br>
<br>
On 06/23/2016 11:28 AM, Дорофеев Илья wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US">Hi guys,</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Recently I’ve come across a wiki page <a href="https://wiki.evolveum.com/display/midPoint/Simplification+of+processing+in+clockwork+and+projector">
https://wiki.evolveum.com/display/midPoint/Simplification+of+processing+in+clockwork+and+projector</a> and have been trying to comprehend what projector waves are all about. The given explanation, to be honest, isn’t clear enough. I have examined the source
code as well. Could you give a bit more detailed reasons for waves and ideas behind them? Probably, some use cases or anything else?</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt">__________________________</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt">Ilya Dorofeev</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;mso-fareast-language:RU"><br>
<br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>midPoint mailing list<o:p></o:p></pre>
<pre><a href="mailto:midPoint@lists.evolveum.com">midPoint@lists.evolveum.com</a><o:p></o:p></pre>
<pre><a href="http://lists.evolveum.com/mailman/listinfo/midpoint">http://lists.evolveum.com/mailman/listinfo/midpoint</a><o:p></o:p></pre>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;mso-fareast-language:RU"><o:p> </o:p></span></p>
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