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From Martin Townsend <>
Subject Re: Memory Pool
Date Tue, 12 Oct 2010 08:47:32 GMT
  On 11/10/2010 20:48, Nick Kew wrote:
> On Mon, 11 Oct 2010 15:14:02 +0100
> Martin Townsend<>  wrote:
>>    Hi,
>> I have created a pool from the child pool for storing warning messages
>> that can live across requests, the final request will insert the
>> warnings into the response.  How do I ensure that this pool is cleared
>> at the end of the final request?
> That doesn't really make sense.  What is "the final request"?
> If it's requests in a connection, use the connection pool.
> Otherwise, you're looking at a time-based solution such
> as garbage collection.

Thanks for the reply and Apologies, I should have put a bit more detail 
in.  I'm working on a module for an embedded platform where we can use 
the web server to configure the firmware.  The interface between the 
module and firmware allows the firmware to send back warning messages 
for side effects of configuration changes.  The time taken for the 
configuration change will likely outlive the connection timeout.  I 
could increase this timeout but I would like to keep it short as you can 
only connect to the web server from a local network and then I can keep 
the number of child processes low.

These warnings are inserted into a response as a table within a DIV HTML 
element by my output filter.  So what usually happens is that the first 
request is a POST with the configure command, an input filter parses 
this and sends the configure to the firmware, the firmware then may send 
back warning messages.  Theses are collected and stored in a list.  The 
next request (which I wrongly referred to as the final request) will 
then have the warning table inserted into the response to which the 
client can then use javascript to display as an overlay.

I've implemented a solution where I use a sub pool from the child pool 
which is now cleared using a flag which I set when the warnings are 
processed by the output filter.  The next (initial) request will then 
pick up the flag and clear the pool.  What I was hoping for, is a hook 
at a point after the data had been sent but the flag works well.

Martin Townsend
Suite 1, Unit 41
Shrivenham Hundred Business Park
Majors Road
Wilts SN6 8TZ

Mobile: 07884 444658
Skype: mtownsend1973

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