<div dir="ltr">Hi David,<br><div> The exception that is signaled is MethodInCallStackToBecomeInvalid.</div><div> It means that there is a method context in the stack that has a reference to the object you want to "become", in this case it is self.</div><div> Doing a become in such a condition can produce problems (I do not remember the exact details of them, but something related to the method being jitted or something like that) and that is why the check and signaling the exception, but the exception is resumable as you saw. I have never had any problem resuming that exception under this circumstance. </div><div><br></div><div>Cheers</div><div>Hernan.</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Feb 26, 2024 at 6:09 AM David Faitelson via Cuis-dev <<a href="mailto:cuis-dev@lists.cuis.st">cuis-dev@lists.cuis.st</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg319760941679385087"> <div lang="EN-US" style="overflow-wrap: break-word;"> <div class="m_319760941679385087WordSection1"> <p class="MsoNormal">Hi dear all,<u></u><u></u></p> <p class="MsoNormal"><u></u> <u></u></p> <p class="MsoNormal">I want to use become: to lazily load objects from a database. Something along the lines of:<u></u><u></u></p> <p class="MsoNormal"><u></u> <u></u></p> <p class="MsoNormal">Stub >> doesNotUnderstand: aMessage<u></u><u></u></p> <p class="MsoNormal"><u></u> <u></u></p> <p class="MsoNormal"> | actual |<u></u><u></u></p> <p class="MsoNormal"> <u></u><u></u></p> <p class="MsoNormal"> actual := “fetch from db”.<u></u><u></u></p> <p class="MsoNormal"> <u></u><u></u></p> <p class="MsoNormal"> self become: actual.<u></u><u></u></p> <p class="MsoNormal"> <u></u><u></u></p> <p class="MsoNormal"> aMessage sendTo: self.<u></u><u></u></p> <p class="MsoNormal"><u></u> <u></u></p> <p class="MsoNormal">When I run this code I get an exception, but if I continue despite the signal, the operations succeeds and the stub is correctly replaced by the actual object.<u></u><u></u></p> <p class="MsoNormal"><u></u> <u></u></p> <p class="MsoNormal">Is this specific use of become: safe despite the warning? Or does it work by luck and I should seek a different solution? Or perhaps I can use become: in some other way to achieve this effect?<u></u><u></u></p> <p class="MsoNormal"><u></u> <u></u></p> <p class="MsoNormal">Thanks,<u></u><u></u></p> <p class="MsoNormal">David<u></u><u></u></p> <p class="MsoNormal"><u></u> <u></u></p> <p class="MsoNormal"><u></u> <u></u></p> <p class="MsoNormal"><u></u> <u></u></p> <p class="MsoNormal"> <u></u><u></u></p> <p class="MsoNormal"><u></u> <u></u></p> <div> <div> <p class="MsoNormal"><span style="font-size:12pt;font-family:"Times New Roman",serif;color:black"> </span><span style="font-size:12pt;font-family:Calibri,sans-serif"><u></u><u></u></span></p> </div> </div> <p class="MsoNormal"><u></u> <u></u></p> </div> </div> -- <br> Cuis-dev mailing list<br> <a href="mailto:Cuis-dev@lists.cuis.st" target="_blank">Cuis-dev@lists.cuis.st</a><br> <a href="https://lists.cuis.st/mailman/listinfo/cuis-dev" rel="noreferrer" target="_blank">https://lists.cuis.st/mailman/listinfo/cuis-dev</a><br> </div></blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div style="font-size:small"><div dir="ltr"><div dir="ltr"><div style="font-size:12.8px"><span style="font-family:tahoma,sans-serif;font-size:xx-small;border-collapse:collapse"><strong><span style="font-size:8pt"><span style="font-size:small"><font size="2"><span style="font-weight:normal"><span style="font-weight:bold">Hernán Wilkinson</span><br>Agile Software Development, Teaching & Coaching</span></font></span></span></strong></span></div><div style="font-size:12.8px"><span style="font-family:tahoma,sans-serif;font-size:xx-small;border-collapse:collapse"><strong><span style="font-size:8pt"><span style="font-size:small"><font size="2"><span style="font-weight:normal">Phone: +54-011</span></font></span></span></strong></span><font face="tahoma, sans-serif" size="2">-4893-2057</font></div><div style="font-size:12.8px"><strong style="font-family:tahoma,sans-serif;font-size:xx-small"><span style="font-size:8pt"><span style="font-size:small"><font size="2"><span style="font-weight:normal">Twitter: @HernanWilkinson</span></font></span></span></strong></div><div style="font-size:12.8px"><span style="font-family:tahoma,sans-serif;font-size:xx-small;border-collapse:collapse"><strong><span style="font-size:8pt"><span style="font-size:small"><font size="2"><span style="font-weight:normal">site: <a href="http://www.10pines.com/" style="color:rgb(17,65,112)" target="_blank">http://www.10Pines.com</a></span></font></span></span></strong></span></div><div style="font-size:12.8px"><font face="tahoma, sans-serif"><span style="border-collapse:collapse">Address: Alem 896</span></font>, Floor 6, Buenos Aires, Argentina</div></div></div></div></div></div></div></div>