alias mechanism for services

Currently I have these services defined:

• JBossNodeHandler (role = "jboss")
• JBossDeployHandler (abstract)
  • JBossDeployPassHandler (role = "pass")
  • JBossDeployAlexHandler (role = "alex")

This allows me to use the folowing .properties file:

whirr.cluster-name=jbosstest

whirr.instance-templates=2 jboss+alex,2 jboss+pass
whirr.hardware-min-ram=1024
whirr.firewall-rules.jboss=8080

# For EC2 set AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY environment variables.
whirr.provider=aws-ec2
whirr.identity=${env:AWS_ACCESS_KEY_ID}
whirr.credential=${env:AWS_SECRET_ACCESS_KEY}

# Apps to deploy
whirr.alex.tarball.url=http://x.y.org/wastebin/alex-1.0.war
whirr.pass.tarball.url=http://x.y.org/wastebin/pass-1.0.war

If I want to add a new service, I would need to create another subclass of JBossDeployHandler to create a new role which i can then use in the .properties file. Since all application deploys on jboss typically need the same procedure to deploy, it would be handy if I could just have 1 implementation (eg: JBossDeployHandler) that I can give multiple role names, so that i can just add new applications to the .properties file without needing to create new subclasses.

My subclasses currently are just dummy classes like:

public class JBossDeployAlexHandler extends JBossDeployHandler {
    public static final String ROLE = "alex";

    @Override
    public String getRole() {
        return ROLE;
    }
}