[Seaside] Long running tasks

[Paul DeBruicker]

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
> <http://onsmalltalk.com/polling-for-long-running-processes>
> http://onsmalltalk.com/2010-07-28-a-simple-thread-pool-for-smalltalk
> <http://onsmalltalk.com/2010-07-28-a-simple-thread-pool-for-smalltalk>
> 
> 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/
> <https://github.com/recurve/ScriptaculistPharoHeySql/>
> 
> 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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