On Mar 14, 2021, at 6:44 PM, Paul DeBruicker <[hidden email]> wrote:

http://smalltalkhub.com/pdebruic/ThreadPool/

Is the code from Ramon's blog post & works with Seaside and Pharo/GemStone
and I think Squeak.





Aaron Rosenzweig wrote

Hi, 

Last I checked, Seaside is single-threaded which is a “good thing.” That
said, it implies that every user action must return quickly… perhaps no
longer than 1 second. If the action takes longer, a chain reaction starts
to form from multiple “simultaneous” users (not really at-the-same-time
users, they queue up with the single thread). There are times, in apps
I’ve written, where the act of clicking a link (or button) is expected to
take 10 minutes (sometimes half hour). During this time we want to fork a
thread to do the big task (like generate a report) that doesn’t tie up the
main thread. This way we can poll every 2 seconds to ask “are you done
yet?” with a progress bar and then ultimately bring the user back to the
normal flow. 

Does Seaside have a pre-baked solution for this? 

If not, I’ll take Ramon’s lead as his posts are the only thing I’ve been
able to find about the subject:
http://onsmalltalk.com/polling-for-long-running-processes
&lt;http://onsmalltalk.com/polling-for-long-running-processes&gt;
http://onsmalltalk.com/2010-07-28-a-simple-thread-pool-for-smalltalk
&lt;http://onsmalltalk.com/2010-07-28-a-simple-thread-pool-for-smalltalk&gt;

In his case, he wanted a page to load immediately but then have a handful
(or more) ajax requests running in the background pinging other servers to
tally prices for a travel quote site. Sort of like those interlaced GIF
images back in the day, his page pops with basic information then
progressively renders other parts. So his example has maybe 10 threads
forked for one page to fully load and shows updates inline. 

I was thinking more of one page WAProgress (I made that up) with one
forked thread that monitors its execution and returns when it either
completes, errors, or the user clicks a cancel link. 

These are things baked into WebObjects (NeXT / Apple) and is what my
buddies and I use daily. We are tiptoeing around the idea of starting new
web development projects with Smalltalk / Seaside and testing the waters. 

I’ve setup a public demo app / repo to test out these concepts: 

https://github.com/recurve/ScriptaculistPharoHeySql/
&lt;https://github.com/recurve/ScriptaculistPharoHeySql/&gt;

It’s an address book application. What I’ll do is modify the delete of a
contact to fork and render the Progress component and programmatically
make the delete slow to show the feature. By the way, how do I do the
equivalent of “Thread.sleep()” in Smalltalk? 

Thanks in advance for any advice you may have,
— Aaron
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