Antwort: Re: Handling multiple concurrent submits

[mathias . werlitz]

A second thought:

There migth also be some important issues with the new sever-side state saving. I'm not sure how it is implemented in detail. The state consists of the component tree and the state.
Now if concurrent requests are processed for the same view, every request should get a individual component tree otherwise fatal side effects would occure within the components.

Mathias can you clarify the way how the component tree is saved and restored with the new implementation?




[EMAIL PROTECTED] schrieb am 09.11.2005 09:26:09:

> You'll need to synchronize access to your session objects - there
> really is not much way around it.
>
> Alternative is to have everything client side, then you don't have any
> problems on the server.
>
> Except the performance, of course ;)
>
> regards,
>
> Martin
>
> On 11/9/05, Simon Kitching <[EMAIL PROTECTED]> wrote:
> > Hi,
> >
> > I've noticed that if I click multiple times on a component that does a
> > submit then quite often I get an exception generated in the server.
> >
> > The most obvious case for me is a table with a sortable header; if I
> > pretend to be impatient and click several times on the sort header then
> > usually I end up with an exception page.
> >
> > I believe the cause is that the browser has submitted several concurrent
> > post requests to the server; multiple threads within the server then try
> > to run the view at the same time, and as view components are not
> > threadsafe all sorts of nasty side-effects occur. An example of a
> > non-threadsafe component is a UIData with session scope; it's got only
> > one rowIndex, so multiple threads trying to iterate over the rows in the
> > table is bound to result in something unpleasant.
> >
> > How do people handle this? I can't force my users to go on a training
> > course about waiting for a page to complete before clicking again. And I
> > can't live with exception pages being rendered to them if they click too
> > quick.
> >
> > Thanks,
> >
> > Simon
> >
>
>
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>
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