RMI

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

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