Magnus ?or Torfason wrote:
> I'm wondering if there is somewhere in Turbine an implementation of UUID's
> (Universally Unique Identifiers)?
> I really need to generate such ID's, and if it does not exist, I would like
> to write a generator and contribute it. One showstopper, I've not seen a
> way to get access to the MAC address of an ethernet card from Java.
> java.net seems to know nothing about the layers beneath IP.
>
> the layout of a UUID is like this (node ID is the MAC adress):
That's really interesting. I had the need for an unique indetifier for
a Turbine instance, and wrote a service that handles that.
Plase consult JavaDocs for org.apache.turbine.services.uniqueid package.
I didn't know about UUID, so I had to make something up. I noticed that
the URL that your application is accessed through makes a very good
world unique indetifier for your application. To normalize it a little bit
I calculated an MD5 sum of this URL. Of course it has a 1:2^128 chance
that different URLs get the same ID, but I think we can live with that :)
I don't think that there is a portable way of querying the MAC address
from under JAVA. This is very system dependent. But even if it was
possible, please consider that multiple application can run on a machine
that has one Ethernet interface assigned multiple IPs (IP aliasing).
Therefore MAC is not a good identifier anyways.
Rafal
PS. The URL I use includes schema,host,port(if nonstandard),context and servlet name
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