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asyncio and legacy replacement patterns

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Philip Sargent 2022-03-29 01:53:38 +01:00
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handbook/troggle/trognotes.html
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@ -57,7 +57,15 @@ Several of us have given this a lot of thought, see <a href="trogsimpler.html">'
the <a href="trog2030.html">2030 plan</a>, <a href="trogspeculate.html">architecture constraints</a> and most importantly, <a href="trogdjango.html#4layer">the 4-layer stack</a> <em>any</em> future technology with some public URLs would need to emulate.
<p>We have also been learning from the global software community when you really do need to 'Kill it with Fire': what are
the characteristics of code and of organisations that mean that it is a good idea to give up, and if so how to
manage the rewrite. The answers are "almost never" and "don't": as explained in <a href="trogkill.html">this summary of the book 'Kill it with Fire'</a>.
manage the rewrite. The answers are "almost never" and "don't": as explained in <a href="trogkill.html">this summary of the book 'Kill it with
Fire'</a>.
<p>Replacing old systems, and changing their architecture, while keeping them operating continuously, is now
<a href="https://martinfowler.com/articles/patterns-legacy-displacement/transitional-architecture.html">a well-understood
software engineering process</a> comprising a dozen separate techniques. With troggle, we can probably fairly easily replace the cross-referencing
between different types of things (e.g. logbook entries, survex files, persons, expedition days) but we will find it tricky to replace the
sychronisation and concurrency that SQL databases give us 'for free'. We are waiting to see if Django comes up with something cunning as it steadily
converts to a more asynchronous architecture using python <a href="https://docs.djangoproject.com/en/4.0/topics/async/">asyncio</a>.
<h3>Perhaps an external add-on?</h3>
<p>Perhaps you can program something external to troggle, in JavaScript say, using troggle data?