Гибкое общение клиента с сервером

public interface Command {
    public void execute();
}
 
public class Receiver {
 
    public Agency agency;
    public List<Agency> agencies;
 
    public Receiver(){}
 
    public void insertAgency(){
        new AgencyMapper().insert(agency);
    }
 
    public List<Agency> getAllAgencies(){
        return new AgencyMapper().getAll();
    }
}
 
public class Invoker {
 
    private Command insertAgencyCommand;
    private Command getAllAgenciesCommand;
 
    public Invoker(Command insertAgencyCommand, Command getAllAgenciesCommand) {
        this.insertAgencyCommand = insertAgencyCommand;
        this.getAllAgenciesCommand = getAllAgenciesCommand;
    }
 
    public void insertAgency(){
        insertAgencyCommand.execute();
    }
 
    public void getAllAgencies(){
        getAllAgenciesCommand.execute();
    }
}
 
public class InsertCommand implements Command {
 
    private Receiver receiver;
 
    public InsertCommand(Receiver receiver) {
        this.receiver = receiver;
    }
 
    @Override
    public void execute() {
        receiver.insertAgency();
    }
}
 
public class GetAllCommand implements Command {
 
    public Receiver receiver;
 
    public GetAllCommand(Receiver receiver) {
        this.receiver = receiver;
    }
 
    @Override
    public void execute() {
        receiver.getAllAgencies();
    }
}
 
//test
    public static void main(String[] args){
 
        Receiver res = new Receiver();
        Command insertCom = new InsertCommand(res);
        Command getAllCom = new GetAllCommand(res);
 
        Invoker invoker = new Invoker(insertCom, getAllCom);
 
        //invoker.insertAgency();
        invoker.getAllAgencies();
 
 
    }