Ryan Heise wrote:
> Speaking of registries, could you please explain how they would be used?
> When an application is installed, does it put entries in a global system
> registry? If so, how do you ensure that those entries are deleted when I
> remove the software from my system? (for instances, if I just delete the
> sofware directory)
My implementation of a registry has nothing to do with the JOS system's
behaviour overall. That is, I am not supplying an
installation/deinstallation API with the registry, I am just making a
distributed (RMI), OO registry, that looks a lot like an inverted tree
file system, and can do things like move, replace, merge, retain, link,
update from remote, etc..
The registry is under org.jos.registry (I also made a Wiki page!) and
can be used by any application. If the JOS system decides to use a
central registry (instead of a temp directory), then applications
written for JOS will probably be able to write to a global registry. The
good thing with the registry is that it runs as a server, and it also
has replication capabilities (working on them now), which means that it
assists in the development of a truly distributed JOS system.
I've also included a lot of functionality in the addressing mechanism of
the registry. That is, to access an entry, you do something like this:
Address address = new Address("//dir/dir/dir/entry");
This address object though could have a URI pointing to a specific RMI
registry on any system, so functions like:
registry.copy(local_address, remote_address)
would have the registry copy entries from a registry in any part of the
world...
I will also start working on the security of the registry, which will
work in a way similar to Java's security overall - that is, a CodeBase
object is the group, a Class is the user, etc.
--
"Learn from others' mistakes, for you won't live long
enough to make them all yourself..."
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