[jboss-as7-dev] Exposing runtime state

[Kabir Khan]

On 25 Jan 2011, at 08:52, Heiko Braun wrote:

> 
> 
> 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?
Yes
> Do they get a unique 'name' assigned?  
Yes, host.xml defines server names
> 
>> 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
>>> _______________________________________________
>>> jboss-as7-dev mailing list
>>> jboss-as7-dev at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/jboss-as7-dev
>> 
>> 
>> -- 
>> Brian Stansberry
>> Principal Software Engineer
>> JBoss by Red Hat
>> _______________________________________________
>> jboss-as7-dev mailing list
>> jboss-as7-dev at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/jboss-as7-dev
> 
> 
> _______________________________________________
> jboss-as7-dev mailing list
> jboss-as7-dev at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/jboss-as7-dev