[Seaside] Zinc Callback Limit
Sven Van Caekenberghe
sven at beta9.be
Mon May 14 19:50:39 UTC 2012
Hi Mark,
On 14 May 2012, at 21:22, Mark Smith wrote:
> Hi all,
>
> I realise that this might not be typical usage however I have an application with a lot of checkboxes, well over 100, and have run into a small problem using the ZnZincServerAdaptor. When the form is submitted, by clicking the submit button, the final callback isn't executed, and the server appears to drop the connection.
>
> The following reliably replicates the issue –
>
> renderContentOn: html
> html form: [
> (1 to: 256) do: [ :aNumber |
> html checkbox
> callback: [ :aValue | ].
> html
> space;
> text: 'checkbox', aNumber asString;
> break ].
> html submitButton
> callback: [
> self inform: 'clicked' ];
> value: 'click' ]
>
> Although the exact number of fields/callbacks needed seems to vary. I arrived at 256 by a binary search.
>
> Unfortunately that's as far as I've got :).
>
> Does anyone have any suggestions?
Yes, this is part of Zn server protecting itself against general resource overconsumption as well as against a well-known, recently discovered attack vector. This is hardcoded at ZnConstants class>>#maximumNumberOfDictionaryEntries to 256.
You could overwrite it. In any case, you are the first one hitting the limit ;-)
Sven
--
Sven Van Caekenberghe
http://stfx.eu
Smalltalk is the Red Pill
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