[jboss-as7-dev] Exposing runtime state

[Brian Stansberry]

On 1/24/11 7:07 AM, Heiko Braun wrote:
>
>
> How can I retrieve runtime state from the domain model?
> For instance:
>
> - the number of server instances running on a host?

{
     "operation" => "read-children_names",
     "address" => [("host" => "hostA")],
     "name" => "server"
}

That's the direct way; get's a list of running server names.

> - the number of connections in use (JCA Pool) on a host?

{
     "operation" => "read-attribute",
     "address" => [
         ("host" => "hostA"),
         ("server" => "server1"),
         ("subsystem" => "connector"),
         ("connector" => "foo")
     ],
     "name" => "current-connection-count"
}

I made up the last bit of the address and the attribute name; I'll check 
with Jesper for details if you need them. Note the host=>hostA, 
server=>server1 -- that's what makes this a single server request.

> - the number of connections in use across servers?

{
     "operation" => "read-attribute",
     "address" => [
         ("profile" => "default"),
         ("subsystem" => "connector"),
         ("connector" => "foo")
     ],
     "name" => "current-connection-count"
}

The idea is the DC should send the request to all HCs, who in turn would 
translate it into server level requests for the relevant servers (those 
running profile=>default). The DC would report back results for all 
servers, a la the "Multi-Server Responses" section on 
http://community.jboss.org/docs/DOC-16354

The result wouldn't be an aggregate figure; i.e. add up the numbers from 
each server for a total. That kind of thing is possible, but I think 
would be too much work to do in any but the most critical use cases.

>
>
> A pseudo code expression for the operation and it's return values would be helpful.
> I am especially interested in addressing of those operations and the distinction between
> runtime state for the domain (i.e. number of server instances) and runtime state of a particular host.
>
> Ike
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-- 
Brian Stansberry
Principal Software Engineer
JBoss by Red Hat