[Seaside] Zinc Callback Limit

[Philippe Marschall]

On Mon, May 14, 2012 at 9:50 PM, Sven Van Caekenberghe <sven at beta9.be> wrote:
> 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.

It's checkboxes, not links, I overlooked that at first. Makes sense now.

Cheers
Philippe