[jboss-as7-dev] Exposing runtime state

[Heiko Braun]

Please see my comments inline.

On Jan 24, 2011, at 11:08 PM, Brian Stansberry wrote:

> 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"
> }
> 

Now I am confused. Looking at the schema, I did assume that
'/host/servers/server' is merely a configuration template for a server instance.

Will these be created dynamically when an instance is started?
Do they get a unique 'name' assigned?  

> 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.

ok, makes sense. I was basically wondering how instances are addressed.
(See question above)

> 
>> - 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.

Agreed, let's skip aggregation. 


> 
>> 
>> 
>> 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
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