How to access JBoss port offset in my application?

[clempinch]

Hello,

We currently have several JBoss AS 7.1.1.Final servers deployed on the same machine and we are successfully using the offset properties to avoid port collision.

For example:

<server name="server1" group="server-group1" auto-start="true">

            <socket-bindings socket-binding-group="full-sockets" port-offset="250"/>

</server>

The fact is that I would like to retrieve this offset value in my application. There, I indeed define some listening port and I would like to avoid port collision the same way using the JBoss offset.

My application is packaged as an EAR and I was planning to retrieve this offset value as a system property.

I tried to use ${jboss.socket.binding.port-offset} but this does not work unless we have:

<server name="server1" group="server-group1" auto-start="true">

            <socket-bindings socket-binding-group="full-sockets" port-offset="${jboss.socket.binding.port-offset:250}"/>

</server>

and explicitely passing -Djboss.socket.binding.port-offset to the JBoss startup.

This does not satisfy me.

Does anyone know how I can access the port offset as a property from my application?

[nickarls]

If you connect with jboss-cli -c and do a

[standalone@localhost:9999 /] /socket-binding-group=standard-sockets:read-attribute(name="port-offset")

you get a

{

    "outcome" => "success",

    "result" => expression "${jboss.socket.binding.port-offset:0}"

}

which leads me to (without testing) believe that absolute values can be read in the same way. And that same attribute could also be read from within the application with a ModelControllerClient...

[clempinch]

Thank you for your reply.

It works! Here is the code using ModelControllerClient:

public int getOffset() {

    ModelControllerClient client = null;

    try {

        ModelNode op = new ModelNode();

        op.get(ClientConstants.OP).set("read-attribute");

        op.get("name").set("port-offset");

        op.get(ClientConstants.OP_ADDR).add("socket-binding-group", "standard-sockets");

        client = ModelControllerClient.Factory.create("localhost", 9999);

        ModelNode response = client.execute(new OperationBuilder(op).build());

        return Integer.parseInt(response.get(ClientConstants.RESULT).toString());

    } catch (UnknownHostException e) {

        // handle the exception

        return 0;

    } catch (IOException e) {

        // handle the exception

        return 0;

    } finally {

        if (client != null) {

        try {

            client.close();

        } catch (IOException e) {

            // handle the exception

        }

        }

    }

}

My concerns now are: how to avoid the remote calls to localhost:9999 and how to integrate this to my application as a system property...

I think I will try what is proposed there: http://management-platform.blogspot.fr/2012/07/co-located-management-client-for.html

But this is another debate.

[nickarls]

The direct service lookup has the advantage that you don't need to know the management port in advance.