import java.rmi.*;
import java.rmi.server.*;
import java.rmi.registry.*;

public abstract class NetworkPeer implements java.rmi.Remote {

    public void exportMethods() throws java.rmi.RemoteException {
        java.rmi.server.UnicastRemoteObject.exportObject(this);
    }

    public java.rmi.Remote locatePeer(String peerHost,int peerPort, String peerName) throws Exception {
        return java.rmi.Naming.lookup("rmi://" + peerHost + ":" + peerPort + "/" + peerName);
    }

    public void startAsNetworkClientOf(String peerHost, int peerPort, String peerName) throws Exception {
        this.exportMethods();
        java.rmi.Remote peer = this.locatePeer(peerHost, peerPort, peerName);
        this.startAsClientOf(peer); // see below 
    }

    public void startAsNetworkServer(String name, int port) {
        System.setSecurityManager(new java.rmi.RMISecurityManager());
        try {
            this.exportMethods();
            java.rmi.registry.Registry registry = java.rmi.registry.LocateRegistry.createRegistry(port);
            registry.bind(name, this);
            this.startAsServer(); // see below 
        } catch (Exception e) { System.out.println("Server error: " + e + " ... "); }
    }

    public void startAsServer() { // essentially empty implementation, just like the method below
        System.out.println("Server is ready ... ");
    }

    public void startAsClientOf(java.rmi.Remote peer) throws java.rmi.RemoteException {
        System.out.println("Client created/started... ");
    } 


}