<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 8 May 2017, at 08:57, Max Leske <<a href="mailto:maxleske@gmail.com" class="">maxleske@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><blockquote type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class=""><br class="Apple-interchange-newline">On 7 May 2017, at 23:09, Philippe Marschall <<a href="mailto:philippe.marschall@gmail.com" class="">philippe.marschall@gmail.com</a>> wrote:<br class=""><br class="">On Sun, May 7, 2017 at 8:26 AM, Max Leske <<a href="mailto:maxleske@gmail.com" class="">maxleske@gmail.com</a>> wrote:<br class=""><blockquote type="cite" class=""><br class=""><blockquote type="cite" class="">On 6 May 2017, at 20:04, Philippe Marschall <<a href="mailto:philippe.marschall@gmail.com" class="">philippe.marschall@gmail.com</a>> wrote:<br class=""><br class="">On Sat, May 6, 2017 at 5:34 PM, Max Leske <<a href="mailto:maxleske@gmail.com" class="">maxleske@gmail.com</a>> wrote:<br class=""><blockquote type="cite" class="">Hi,<br class=""><br class="">I would like to use a current request context variable that inherits from DynamicVariable in Pharo and not from WADynamicVariable (I don't want to use the exception mechanism).<br class=""></blockquote><br class="">Can you provide a bit more context? How is it implemented in Pharo? To<br class="">with Pharo versions does this apply?<br class=""></blockquote><br class="">Sure. DynamicVariables are stored in the environment of the process. They are singletons and the sole instance is used as the lookup key into the process environment dictionary. The access semantics are nearly identical to WADynamicVariable, so they can easily be exchanged. There are two advantages over WADynamicVariable:<br class=""><br class="">1. Access time is constant and no handler context is required<br class="">2. The process environment can easily be copied, making it possible to transfer availability of a request context to a different process, e.g. for debugging (I've done that for our own apps in Seaside 2.8)<br class=""><br class="">DynamicVariable has been in Pharo at least since version 1.1.1. and I have been using it in production as a replacement for WACurrentSession from Seaside 2.8 for about two years now.<br class=""></blockquote><br class="">I see the need but have reservations about the implementation. We have<br class="">other dynamic variables which would benefit from this as well.<br class="">WADynamicVariable is supposed to be our portable dynamic variable<br class="">abstraction.<br class="">Do you know what the situation is in the other dialects (GS, VASt, VW)<br class="">regarding dynamic variables? Do they have a DynamicVariable class as<br class="">well?<br class=""></blockquote><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">I have no clue, no (I've never worked with either VA nor VW). I'll try to find out this morning.</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""></div></blockquote><div><br class=""></div><div>VW does not have dynamic variables AFAICT, but they do have a process environment, so it would be straight forward to implement them in the same way as in Pharo.</div><div><br class=""></div><div>I'm still waiting for my VA evaluation download...</div><br class=""><blockquote type="cite" class=""><div class=""><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><blockquote type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">In theory we could say that the dialect has to provide a<br class="">GRDynamicVariable, we could provide a GRExceptionBasedDynamicVariable.<br class="">Dialects that have a DynamicVariable class could provide<br class="">GRDynamicVariable as a subclass of DynamicVariable. Dialects that do<br class="">not have a DynamicVariable class could provide GRDynamicVariable as a<br class="">subclass of GRExceptionBasedDynamicVariable.<br class=""></blockquote><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">Yes, that sounds like a good idea. I don't have a clear picture of how your suggestion would be implemented with Grease. So if you could help me out there, I'd appreciated it.</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">Cheers,</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">Max</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><blockquote type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class=""><br class="">Cheers<br class="">Philippe<br class="">_______________________________________________<br class="">seaside-dev mailing list<br class=""><a href="mailto:seaside-dev@lists.squeakfoundation.org" class="">seaside-dev@lists.squeakfoundation.org</a><br class=""><a href="http://lists.squeakfoundation.org/mailman/listinfo/seaside-dev" class="">http://lists.squeakfoundation.org/mailman/listinfo/seaside-dev</a></blockquote></div></blockquote></div><br class=""></body></html>