RMI
- By Vince Huston
- July 24, 2001
Java Primer
Incremental J2EE
by Vince Huston
Listing 2. RMI.
// Purpose. RMI
import java.util.*;
import java.rmi.*; // Remote, RemoteException
import java.rmi.server.*; // UnicastRemoteObject
import java.net.MalformedURLException;
class Item implements java.io.Serializable {
private String name;
public Item( String na ) { name = na; }
public String toString() { return name; }
}
interface RIStore extends Remote {
ArrayList getItems() throws RemoteException;
String placeOrder( ArrayList list ) throws RemoteException;
}
class StoreImpl extends UnicastRemoteObject implements RIStore {
private ArrayList itemList = new ArrayList();
public StoreImpl() throws RemoteException {
itemList.add( new Item( "Design Patterns by GOF" ) );
itemList.add( new Item( "Using UML and Patterns" ) );
itemList.add( new Item( "C++ for Deadend Careers" ) );
itemList.add( new Item( "Java for Resume Inflation" ) );
itemList.add( new Item( "Practical Java" ) );
}
public ArrayList getItems() { return itemList; }
public String placeOrder( ArrayList list ) {
StringBuffer sb = new StringBuffer();
Item ele;
System.out.println();
sb.append( "The following items were ordered:\n" );
for (Iterator it = list.iterator(); it.hasNext(); ) {
ele = (Item) itemList.get( ((Integer)it.next()).intValue() );
System.out.println( ele );
sb.append( " " );
sb.append( ele );
sb.append( '\n' );
}
return sb.toString();
}
public static void main( String[] args ) {
try {
Naming.rebind( "rmi://127.0.0.1/StoreServer", new StoreImpl() );
System.out.println( "StoreServer bound in rmiregistry" );
} catch (MalformedURLException ex ) { ex.printStackTrace();
} catch (RemoteException ex ) { ex.printStackTrace();
} } }
import java.util.*;
import java.io.*;
import java.rmi.*;
import java.net.MalformedURLException;
public class StoreClient {
public static void main( String[] args ) {
BufferedReader in = new BufferedReader(
new InputStreamReader( System.in ) );
ArrayList theChoices = new ArrayList();
int choice;
try {
RIStore theStore = (RIStore) Naming.lookup( "rmi://localhost/StoreServer" );
ArrayList theItems = theStore.getItems();
System.out.println( "Select from (0 when done):" );
Iterator it = theItems.iterator();
for (int i=1; it.hasNext(); i++)
System.out.println( " " + i + " - " + it.next() );
while (true) {
System.out.print( "Choice: " );
if ((choice = Integer.parseInt( in.readLine() )) == 0) break;
theChoices.add( new Integer( choice-1 ) );
}
System.out.println( theStore.placeOrder( theChoices ) );
} catch (NotBoundException ex ) { ex.printStackTrace();
} catch (RemoteException ex ) { ex.printStackTrace();
} catch (IOException ex ) { ex.printStackTrace();
} } }
// Select from (0 when done):
// 1 - Design Patterns by GOF
// 2 - Using UML and Patterns
// 3 - C++ for Deadend Careers
// 4 - Java for Resume Inflation
// 5 - Practical Java
// Choice: 1
// Choice: 3
// Choice: 5
// Choice: 0
// The following items were ordered:
// Design Patterns by GOF
// C++ for Deadend Careers
// Practical Java