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Client:
import java.rmi.*;
import java.math.*;
public class Client {
public static void doIt(String catServer, String mouseServer, int port) {
MyServer aCatServer;
MyServer aMouseServer;
Point aPoint = new Point(4, 2 );
System.out.println("In Client: cat is on: " + catServer );
System.out.println("In Client: mouse is on: " + mouseServer );
System.out.println("In Client: port is: " + port );
try {
aCatServer = (MyServer)Naming.lookup("rmi://" +
catServer + ":" + port + "/CatServer");
aMouseServer = (MyServer)Naming.lookup("rmi://" +
mouseServer + ":" + port + "/MouseServer");
// -------------- Cat --------------------
System.out.println("In Client: aCatServer.movePoint(aPoint): " +
(aPoint = aCatServer.movePoint(aPoint)).toString() );
System.out.println("In Client: aCatServer.movePoint(aPoint): " +
aCatServer.movePoint(aPoint).toString() );
System.out.println("In Client: aCatServer.movePoint(aPoint): " +
aCatServer.movePoint(aPoint).toString() );
// -------------- Mouse --------------------
System.out.println("In Client: aMouseServer.movePoint(aPoint): " +
(aPoint = aMouseServer.movePoint(aPoint)).toString() );
System.out.println("In Client: aMouseServer.movePoint(aPoint): " +
aMouseServer.movePoint(aPoint).toString() );
System.out.println("In Client: aMouseServer.movePoint(aPoint): " +
aMouseServer.movePoint(aPoint).toString() );
} catch (Exception e) {
System.out.println("Something went wrong: " +
e.getMessage());
e.printStackTrace();
}
}
public static void main(String args[] ) {
int port = 1099;
String catServer = "yps";
String mouseServer = "yps";
if ( args.length >= 1 )
catServer = args[0];
if ( args.length >= 2 )
mouseServer = args[1];
if ( args.length == 3 )
try {
port = Integer.parseInt(args[2]);
}
catch ( NumberFormatException e ) {
System.out.println("Hm , port = " +
args[2] + " is not valid.");
System.exit(1);
}
if ( args.length > 3 ) {
System.out.println("Usage: " +
"java Client [CatServer [MouseServer [port]]]");
System.exit(1);
}
doIt(catServer, mouseServer, port);
}
}
Source Code: Src//16_MS/Client.java
Interface:
public interface MyServer extends java.rmi.Remote {
Point movePoint(Point aPoint) throws java.rmi.RemoteException;
int getX() throws java.rmi.RemoteException;
int getY() throws java.rmi.RemoteException;
}
Source Code: Src//16_MS/MyServer.java
Cat Server
import java.rmi.*;
import java.rmi.server.UnicastRemoteObject;
public class CatServer extends UnicastRemoteObject implements MyServer
{
final private int DELTA = 10;
private int x;
private int y;
private Point aPoint;
public CatServer() throws RemoteException {
;
}
public Point movePoint(Point aPoint) throws RemoteException {
System.out.println("\tIN CatServer: movePoint(): "
+ aPoint.toString() );
return aPoint.move(DELTA, DELTA);
}
public int getX() throws RemoteException {
System.out.println("\tCIN atServer: getX(): " + x );
return x;
}
public int getY() throws RemoteException {
System.out.println("\tCIN atServer: getY(): " + y );
return x;
}
public static void main(String args[])
{
int port = 1099;
// System.setSecurityManager(new RMISecurityManager());
if ( args.length == 1 )
try {
port = Integer.parseInt(args[0]);
}
catch ( NumberFormatException e ) {
System.out.println("Hm , port = " +
args[0] + " is not valid.");
System.exit(1);
}
try {
CatServer obj = new CatServer();
System.out.println("\tIN CatServer: " +
"rmi://:" + port + "/CatServer");
Naming.rebind("rmi://:" + port + "/CatServer", obj);
System.out.println("\tIN CatServer bound in registry");
} catch (RemoteException e) {
System.out.println("CatServer RemoteException ");
e.printStackTrace();
} catch (Exception e) {
System.out.println("CatServer err: "
+ e.getMessage());
e.printStackTrace();
}
}
}
Source Code: Src//16_MS/CatServer.java
Point Class:
/**
* This class implements a point in a two dimensional
* area.
* All methods print the method name, when they are called.
* state information includes:
*
* @version $Id$
*
* RIT's home page: <a href="http://www.cs.rit.edu/~hpb">RIT</a>
*
* Revisions:
* $Log$
*/
import java.io.*;
public class Point implements Serializable {
private int x; // x coordinate of the point
private int y; // y cooridnate of the point
/**
* Constructor.
* initialize x and y values of a point
*
* @param x x coordinate
* @param y y coordinate
*
* @return a Point object
*/
public Point(int _x, int _y){
this.x = _x;
this.y = _y;
}
private void writeObject(ObjectOutputStream s) throws IOException {
s.defaultWriteObject();
}
private void readObject(ObjectInputStream s) throws IOException {
try {
s.defaultReadObject();
}
catch ( ClassNotFoundException e) {
System.out.println(e.getMessage());
e.printStackTrace();
}
}
/**
* initialzes x and y of a point.
*
* @param x int x coordinate
* @param y int y coordinate
*
* @return a Point object
*/
public Point initPoint(int _x, int _y){
this.x = _x;
this.y = _y;
return this;
}
/**
* moves a point
*
* @param _x int delta x value
* @param _y int delta y value
*
* @return a Point object
*/
public Point move(int _x, int _y){
this.x += _x;
this.y += _y;
return this;
}
/**
* Returns the x coordinate of a point
*
* @return x value
*/
public int getX(){
return this.x;
}
/**
* Returns the y coordinate of a point
*
* @return y value
*/
public int getY(){
return this.y;
}
/**
* Returns a String reperesentation of the point
*
* @return String reprasentation of the point
*/
public String toString(){
return "Point at (" + x + "/" + y + ")";
}
}
Source Code: Src/16_MS/Point.java
Makefile:
1 2 3 all: Point.class \ 4 CatServer_Skel.class CatServer_Stub.class \ 5 MouseServer_Skel.class MouseServer_Stub.class \ 6 MyServer.class Client.class 7 8 fireItUp 9 10 11 CatServer_Skel.class CatServer_Stub.class: CatServer.java 12 rmic CatServer 13 MouseServer_Skel.class MouseServer_Stub.class: MouseServer.java 14 rmic MouseServer 15 16 MyServer.class: MyServer.java 17 javac MyServer.java 18 19 Client.class: Client.java 20 javac Client.java 21 22 CatServer.class: CatServer.java 23 javac CatServer.java 24 25 MouseServer.class: MouseServer.java 26 javac MouseServer.java 27 28 Point.class: Point.java 29 javac Point.java 30 31 clean: 32 rm -f *class
Source Code: Src/16_MS/makefile
Result:
IN CatServer: //yps:2001/CatServer
IN MouseServer: /yps:2001/MouseServer
IN CatServer bound in registry
In Client: cat is on: yps
In Client: mouse is on: yps
In Client: port is: 2001
IN MouseServer bound in registry
IN CatServer: movePoint(): Point at (4/2)
In Client: aCatServer.movePoint(aPoint): Point at (14/12)
IN CatServer: movePoint(): Point at (14/12)
In Client: aCatServer.movePoint(aPoint): Point at (24/22)
IN CatServer: movePoint(): Point at (14/12)
In Client: aCatServer.movePoint(aPoint): Point at (24/22)
Start of a fireItUp Script:
1 #!/bin/sh
2
3 KILL_IT="killIt; killIt java"
4 ME="`who am i | sed 's/ .*//'`"
5 HOSTNAME="`hostname`"
6 USEDHOSTS="yps yps yps" # <-- modify here ...
7 WD=`pwd`
8
9
10 remote_cmd() # bg host cmd
11 {
12 echo "$HOSTNAME $ME" > $HOME/.rhosts
13 if [ $1 = "bg" ]
14 then
15 rsh $2 "rm -f $HOME/.rhosts; cd $WD && $3" &
16 else
17 rsh $2 "rm -f $HOME/.rhosts; cd $WD && $3"
18 fi
19 }
20
21 kill_all()
22 {
23 for i in $USEDHOSTS
24 do
25 remote_cmd fg $i "$KILL_IT" 2>&1 > /dev/null
26 done
27 }
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42 kill_all
43 sleep 2
44
45 echo 1
46 rmiregistry &
47 echo "Waiting for rmiregistry .... chrr ... "; sleep 1
48 java CatServer &
49
50 echo 2
51 remote_cmd bg yps "rmiregistry &"
52
53 echo 3
54 echo "Waiting for rmiregistry .... chrr ... "; sleep 2
55 remote_cmd bg yps "java MouseServer &"
56
57 echo 4
58 echo "Waiting for the servers .... chrr ... "; sleep 2
59 remote_cmd fg yps "java Client $HOSTNAME stones"
60
61 kill_all
62
63 exit 0
64
Source Code: Src/16_MS/fireItUp
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Created by
unroff,
java2html &
& hp-tools.
© by csfac. All Rights Reserved (2010).
It is not allowed to print these pages on a CAST printer.
Last modified: 01/April/10 (17:16)