Re: LinkLayer and HTTP tunneling

Hi Chris,

On Sunday, April 14, 2002, at 04:09 PM, chrisvanlith@b3partners.nl
wrote:

>
> Hello,
>
> Not liking the fact that the linkLayer needs to use several ports, in
> case you want more than one linkLayer, I am looking for other options.
> As a matter of fact, my security officer does not like it if I use
> anything else than port 80 or 443.

Multiple LinkLayers don't have to have their own ports, it depends on
the capabilites of the LinkServer. A LinkServer can be written to use
the LinkProperties to fine-tune the request, so that different layers
can contact it for specific information. If a LinkServer has access to
a database with multiple feature types, the layer can specify which
feature it wants.

> For that reason I am considering HTTP tunneling in two options:
> 1.        Using the linkLayer as much as possible, using the transfer
> protocol as such. Several servlets can than serve as the provider of
> the graphics for the layers.
> 2.        To create a new system, where the client simply uses the
> OMGraphicList for additions and deletes. The client can than press a
> refresh button, which sends the the whole OMGraphicsList to the servlet
> (via the HTTP tunnel). The servlet in turn updates the database and
> sends the list back.
>
> After looking through the code I am inclined to go for the second
> option.
>
> Does anyone have experience with using HTTP tunneling with Openmaps? Is
> option 1 better than 2?

I was looking at
http://www-106.ibm.com/developerworks/java/library/j-tunnel/?dwzone=java

Seems like some of the same principles in the project could be applied
to wrapping the link communications through a HTTP tunnel, and leave
your current link code pretty much intact.

- Don

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Don Dietrick, BBN Technologies, dietrick@bbn.com
10 Moulton Street, Cambridge, MA 02138
617-873-3031 [fax]-2794
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