public class SopFactory{
    private static Map<String, List<ConfigObject>> confs = new HashMap<String, List<ConfigObject>>();

    public Sop createSop(name){
        List<ConfigObject> conf = null;
        if((conf = confs.get(name) == null){
            conf = loadConf(name);
            confs.put(name, conf)
        }
        return new Sop(conf);
    }

    public static void init(){
        // load configuration into conf
    }

    public static void destory(){
        conf.clear();
        conf = null;
    }

    private List<ConfigObject> loadConf(String confName){
        // ...
    }
}

public class Sop{
    // reference to cached configuration in SopFactory
    // it's for read only
    // for thread safety, never expose this to client
    private List<ConfigObject> conf;

    protected Sop(List<ConfigObject> conf){
        this.conf = conf;
    }

    public void send(Object data){
        for(ConfigObjecto : conf){
            // access configuration information to assemble packet
        }
    }
}