hello Koen,
nice to here about the improvements in Wt 3. Do you have any idea when you
will be able to release the first Wt 3?
Thanks
Misi
2009/2/16 Koen Deforche <[email protected]>
> Hey all,
>
> We have been working for some time now on a new development branch of
> Wt. This branch is expected to result in a Wt 3 version.
> The reason for the major version bump is a number of changes that are
> not backwards compatible (some of which were on our wish-list for some
> time but got postponed to a major version bump).
>
> The most important are:
>
> 1) signals are no longer public members of widgets, but instead are
> now accessible using an accessor. In practice this means that every
> 'connect' such as 'myWidget->clicked.connect(...)' has to be changed
> to 'myWidget->clicked().connect(...)'. The benefit is lower widget
> memory consumption (between 30 and 50% typically), as signals are only
> created when needed, which on embedded systems with small caches in
> turn results in huge performance benefits (speedups of 2 to 6 fold
> typically).
>
> 2) the resource API has been redesigned, into something at the same
> more simple (only one virtual method) and more powerful. The new API
> change was necessary to implement two specific requests:
> - asynchronous resource streaming: you can now piecewise feed data as
> a resource response. This has as major benefit that you do not need to
> load all data in memory first (or lock a thread for the entire
> duration). An example of this new API usage is the built-in
> WFileResource.
> - allow any kind of data to be POST'ed to a resource, including file
> uploads. This could be used to implement an alternative file upload
> functionality to WFileUpload.
>
> In addition, resources are now reentrant by default, and safeguarded
> against deletion while streaming. This means that resource requests
> will be handled by the application concurrently with normal event
> requests or other resource requests, within a single session, but
> deletion of a resource will block until all pending requests have
> finished.
>
> 3) flags parameters, which were of type 'int' which could accept a
> binary OR of enum values, are now of type WFlags<enum>. While existing
> code should not be affected by this change (although some enums were
> renamed for increased consistency), the benefit is increased static
> type checking by the compiler.
>
> The new branch also contains several other internal changes and
> performance improvements.
>
> But: it is a development branch and many things are still lacking, most
> notably:
> - documentation updates
> - the fastcgi connector is currently broken
>
> For those who are interested in a sneak preview, the new branch is
> available through git access:
> $ git clone http://www.webtoolkit.eu/git/wt.git
>
> We have been using (and enjoying) git internally for several months
> now, but still used CVS for public access. We are now making the
> switch to a public git repository. The public CVS will only be used
> for further maintenance to the Wt 2 series.
>
> Regards,
> koen
>
>
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