On Mon, Jun 24, 2013 at 10:26 PM, Dustin Parker <[email protected]>wrote:
> Forward Slope, Inc. developed a WFS notification mechanism way back in
> GeoServer 1.6.5 and updated it through 2.0.1. Under some of our contracts
> we can't submit GPL-licensed code, and our work is covered under that since
> it'd be a "derivative work". Are there any other notification mechanisms
> already in GeoServer or planned for a future release? I've seen
> documentation on the WFS-V extension and the JMS clustering extension. The
> latter only appears to do configuration metadata, not actual data, so I
> didn't think it was relevant. The WFS-V extension holds some promise, but
> it doesn't really publish per se (clients would have to poll) and doesn't
> appear to work with database views. (Our solution did work with database
> views, but was quite complicated, and we weren't able to get permission to
> release it to the community.) Is there anything else out there?
The WFS-V extension is dead, and has been removed from the GeoServer code
base.
Not sure if the geogit work is going to spawn a new WFS-V like protocol,
but as you say, the protocol was based on polling, like
all OGC protocols, which make no assumption about the server being able to
contact back the client.
In GeoServer we have a transaction listener interface that you can
implement to do what you want, including notifying the
world about changes incoming via WFS-T. The implementation of that and the
minimum bits to get the info out of
GeoServer are automatically under the GPL licence, once you're out of the
GeoServer process though, and reached
for some network or storage mechanism, you're free to licence whatever is
from there under the conditions you prefer
Cheers
Andrea
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