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Message from discussion Gracefully Stop PeriodCallback During Shutdown
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Jon Parise  
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 More options Aug 23 2012, 7:13 pm
From: Jon Parise <j...@indelible.org>
Date: Thu, 23 Aug 2012 16:13:54 -0700
Local: Thurs, Aug 23 2012 7:13 pm
Subject: Re: [tornado] Gracefully Stop PeriodCallback During Shutdown
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I took a closer look at this code against Tornado 2.3, and it doesn't
behave quite the same way as when I originally wrote it a couple of
years back.  For example, the polling behavior doesn't appear to be
working as it once did.  I don't know if something changed in the
surrounding code or in Tornado itself, but I'm afraid I don't have the
time to dig into it at the moment.

If you learn anything useful, however, I'd appreciate hearing about it.

On Wed, Aug 22, 2012 at 2:44 PM, Calvin <calvinwyo...@gmail.com> wrote:
> Ahh this is awesome -- looks like what I was looking for.

> But I do one question about how it works.  On line 20 of your gist, you
> check that there's only a single element in the _handlers list before
> stopping the ioloop.  Reading through the ioloop code, I can see that
> PeriodicCallbacks push _Timeouts onto the _timeout queue, but I fail to see
> how that relates to the _handlers queue.  Why does checking the _handlers
> queue work here?

> Thanks again!

> On Wednesday, August 22, 2012 12:42:26 PM UTC-7, Jon Parise wrote:

>> On Wed, Aug 22, 2012 at 11:03 AM, Calvin <calvin...@gmail.com> wrote:
>> > Hi all,

>> > I have a PeriodicCallback that makes HTTP requests to an external API
>> > via
>> > SimpleAsyncHTTPClient.  Whenever a request is made, it's important to
>> > record
>> > the response in the datatabase; missing a response is bad.

>> > Whenever I shut down the Tornado server, I run the risk of doing so in
>> > the
>> > middle of a request, which would cause my application to miss recording
>> > a
>> > response.  Is there a way to gracefully shut down Tornado, but block if
>> > the
>> > PeriodicCallback is currently running?

>> I use a graceful shutdown process in my application.  It blocks for up
>> to 10 seconds while it waits for IO loop handlers to complete.

>> Here's the code: https://gist.github.com/3428652


 
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