INFO Ass 4. Exercise 1
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1 Exercise 1 INFO Ass 4 public class UserInfo public static final long TIME_OUT = 1000 * 3000 ; public String user; public long id; public long creationdate; public UserInfo(String user,long id) this.user = user; this.id = id; this.creationdate = System.currentTimeMillis(); public boolean isvalid() return (System.currentTimeMillis() - creationdate) < TIME_OUT; public interface ServerIDInterface extends Remote public long login(string username, String password) throws RemoteException; public void logout(long ID) throws RemoteException; public void postmessage(long ID, String message) throws RemoteException; import java.rmi.server.*; import java.util.*; public class ServerIDImpl extends UnicastRemoteObject implements ServerIDInterface private Map idmap; private Random rng; private Map passmap; public ServerIDImpl() throws RemoteException super(); idmap = new HashMap(); passmap = new HashMap(); rng = new Random(); // local method public void adduser(string username, String password) passmap.put(username,password); 1 / 22
2 public long login(string username, String password) throws RemoteException if(passmap.containskey(username)) if(passmap.get(username).equals(password)) long id; Long idobj; do id = rng.nextlong(); idobj = new Long(id); while(idmap.containskey(idobj)); idmap.put(idobj,new UserInfo(username,id)); System.out.println("Connection of " + username + " id : "+id); return id; throw new RemoteException("Connection refused"); public void logout(long id) throws RemoteException Long idobj = new Long(id); if(idmap.containskey(idobj)) idmap.remove(idobj); else throw new RemoteException("Invalid ID"); public void postmessage(long id, String message) throws RemoteException Long idobj = new Long(id); if(idmap.containskey(idobj)) UserInfo user = (UserInfo)idMap.get(idObj); if(user.isvalid()) System.out.println(user.user+" : "+message); return; else // timeout logout(id); 2 / 22
3 throw new RemoteException("Invalid ID"); ServerIDImpl server = new ServerIDImpl(); server.adduser("toto","1234"); server.adduser("titi","1234"); server.adduser("fifi","1234"); Naming.rebind("rmi:// :1234/ServerID",server); System.out.println("Server Started"); public class Client ServerIDInterface server = (ServerIDInterface)Naming.lookup("rmi:// :1234/ServerID"); if(args[0].equals("login")) System.out.println(server.login(args[1],args[2])); else if(args[0].equals("logout")) server.logout(long.parselong(args[1])); else if(args[0].equals("post")) server.postmessage(long.parselong(args[1]),args[2]); Exercise 2 public interface ServerLoginInterface extends Remote public ServerInterface login(string username, String password) throws RemoteException; import java.rmi.server.*; import java.util.*; public class ServerLoginImpl extends UnicastRemoteObject implements ServerLoginInterface private Map passmap; private Display display; public ServerLoginImpl() throws RemoteException 3 / 22
4 super(); passmap = new HashMap(); display = new Display(); // local method public void adduser(string user,string pass) passmap.put(user,pass); public ServerInterface login(string user,string pass) throws RemoteException if(passmap.containskey(user)) if(passmap.get(user).equals(pass)) System.out.println("Connection of "+user); return new ServerImpl(display,user); throw new RemoteException("Connection refused"); ServerLoginImpl server = new ServerLoginImpl(); server.adduser("toto","1234"); server.adduser("titi","1234"); server.adduser("fifi","1234"); Naming.rebind("rmi:// :1234/ServerLogin",server); System.out.println("Server Started"); public interface ServerInterface extends Remote public void postmessage(string message) throws RemoteException; import java.rmi.server.*; public class ServerImpl extends UnicastRemoteObject implements ServerInterface private Display display; private String user; public ServerImpl(Display display, String user) throws RemoteException 4 / 22
5 super(); this.display = display; this.user = user; public void postmessage(string msg) throws RemoteException display.post(user, msg); public class Display public void post(string username, String message) System.out.println(username + " : " + message); public class Client ServerLoginInterface server = (ServerLoginInterface)Naming.lookup("rmi:// :1234/ServerLogin"); ServerInterface connection1 = server.login("toto","1234"); ServerInterface connection2 = server.login("fifi","1234"); connection1.postmessage("hello World!"); connection2.postmessage("hi toto"); connection1.postmessage("where are you fifi?"); connection2.postmessage("somewhere in this World ;)"); 5 / 22
6 INFO Ass 4 Exercise 1 import java.util.random; public class Demo public static void main(string[] args) Random rng = new Random(); DisplayInteger t1 = new DisplayInteger(20,rng); DisplayInteger t2 = new DisplayInteger(15,rng); t1.start(); t2.start(); System.out.println("Launching Finished"); try t1.join(); t2.join(); catch(interruptedexception e) System.out.println(e); System.out.println("Threads Finished"); import java.util.random; public class DisplayInteger extends Thread private int max; private Random rng; public DisplayInteger(int n,random rng) max = n; this.rng = rng; public void run() String name = getname(); for(int i=1;i<=max;i++) System.out.println(name+": "+i); try sleep(math.abs(rng.nextint())%1500); catch (InterruptedException e) System.out.println(name+" terminated"); 6 / 22
7 Exercise 2 import java.util.random; public class Demo public static void main(string[] args) Random rng = new Random(); DisplayInteger t1 = new DisplayInteger(20,rng); DisplayInteger t2 = new DisplayInteger(15,rng); t1.start(); t2.start(); System.out.println("Launching Finished"); t1.suspendt(); try Thread.sleep(4000); catch (InterruptedException e) t2.suspendt(); t1.resumet(); try Thread.sleep(4000); catch (InterruptedException e) t2.resumet(); import java.util.random; public class DisplayInteger extends Thread private int max; private Random rng; private boolean active; public DisplayInteger(int n,random rng) max = n; this.rng = rng; active = true; public void run() String name = getname(); for(int i=1;i<=max;i++) while(!active) // active waiting / busy waiting System.out.println("active waiting ("+name+")"); try sleep(1000); catch (InterruptedException e) System.out.println(name+": "+i); try sleep(math.abs(rng.nextint())%1500); catch (InterruptedException e) 7 / 22
8 System.out.println(name+" terminated"); public void suspendt() active = false; System.out.println("Suspension of "+getname()); public void resumet() active = true; System.out.println("Resuming "+getname()); 8 / 22
9 Exercise 3 import java.util.random; public class Demo public static void main(string[] args) Random rng = new Random(); DisplayInteger t1 = new DisplayInteger(20,rng); DisplayInteger t2 = new DisplayInteger(15,rng); t1.start(); t2.start(); System.out.println("Launching Finished"); t1.suspendt(); try Thread.sleep(4000); catch (InterruptedException e) t2.suspendt(); t1.resumet(); try Thread.sleep(4000); catch (InterruptedException e) t2.resumet(); import java.util.random; public class DisplayInteger extends Thread private int max; private Random rng; private boolean active; public DisplayInteger(int n,random rng) max = n; this.rng = rng; active = true; public void run() String name = getname(); for(int i=1;i<=max;i++) synchronized(this) while(!active) // passive waiting System.out.println("Passive waiting ("+name+")"); try wait(); catch (InterruptedException e) 9 / 22
10 System.out.println(name+": "+i); try sleep(math.abs(rng.nextint())%1500); catch (InterruptedException e) System.out.println(name+" terminated"); public synchronized void suspendt() active = false; System.out.println("Suspension of "+getname()); public synchronized void resumet() active = true; System.out.println("Resuming "+getname()); notify(); 10 / 22
11 Exercise 4 public interface ServerInterface extends Remote public String echo(string message) throws RemoteException; import java.rmi.server.*; import java.util.*; public class ServerImpl extends UnicastRemoteObject implements ServerInterface public ServerImpl() throws RemoteException super(); public String echo(string message) throws RemoteException System.out.println("Ping"); try Thread.sleep(5000); catch(interruptedexception e) System.out.println("Pong"); return "["+message+"]"; ServerImpl server = new ServerImpl(); Naming.rebind("rmi:// :1234/ServerEcho",server); System.out.println("Server Started"); public class Client // the final is added because of the anonymouse class final ServerInterface server = (ServerInterface)Naming.lookup("rmi:// :1234/ServerEcho"); // solution with anonymouse class Thread t = new Thread(new Runnable() public void run() try System.out.println(server.echo("Hello World!")); catch(remoteexception e) System.out.println(e); ); t.start(); 11 / 22
12 System.out.println("Starting the call"); for(int i=1;i<=5;i++) System.out.println(i); try Thread.sleep(1500); catch (InterruptedException e) System.out.println("End of main"); 12 / 22
13 Exercise 5 public class AsynchronousCall extends Thread private ServerInterface server; private boolean done; private String result; private String param; public AsynchronousCall(ServerInterface server,string param) this.server = server; done = false; this.param = param; public void run() try result = server.echo(param); catch(remoteexception e) System.out.println(e); synchronized(this) done = true; notify(); public synchronized boolean isdone() return done; public synchronized String getresult() while(!done) try wait(); catch (InterruptedException e) return result; public class Client ServerInterface server = (ServerInterface)Naming.lookup("rmi:// :1234/ServerEcho"); AsynchronousCall call = new AsynchronousCall(server,"Hello World!"); call.start(); 13 / 22
14 System.out.println("Starting the call"); for(int i=1;i<=5;i++) System.out.println(i); try Thread.sleep(1500); catch (InterruptedException e) System.out.println("Waiting the result"); System.out.println(call.getResult()); System.out.println("End of main"); 14 / 22
15 Exercise 6 public interface PullServerInterface extends Remote public DoSomethingResultInterface dosomething(string param) throws RemoteException; import java.rmi.server.*; public class PullServerImpl extends UnicastRemoteObject implements PullServerInterface public PullServerImpl() throws RemoteException super(); public DoSomethingResultInterface dosomething(string param) throws RemoteException System.out.println("Ping"); DoSomethingResultImpl result = new DoSomethingResultImpl(param); Thread support = new Thread(result); support.start(); System.out.println("Pong"); return result; PullServerImpl server = new PullServerImpl(); Naming.rebind("rmi:// :1234/ServerPull",server); System.out.println("Server Started"); public interface DoSomethingResultInterface extends Remote public boolean isdone() throws RemoteException; public String getresult() throws RemoteException; import java.rmi.server.*; public class DoSomethingResultImpl extends UnicastRemoteObject implements DoSomethingResultInterface,Runnable private String param; private String result; private boolean done; public DoSomethingResultImpl(String param) throws RemoteException super(); this.param = param; done = false; public boolean isdone() throws RemoteException 15 / 22
16 System.out.println("isDone"); return done; public String getresult() throws RemoteException System.out.println("getResult"); return result; public void run() try Thread.sleep(5000); catch(interruptedexception e) result = "["+param+"]"; done = true; public class Client PullServerInterface server = (PullServerInterface)Naming.lookup("rmi:// :1234/ServerPull"); System.out.println("Starting the call"); DoSomethingResultInterface result = server.dosomething("hello World!"); boolean first = true; for(int i=1;i<=5;i++) System.out.println(i); try Thread.sleep(1500); catch (InterruptedException e) System.out.println("Waiting the result"); if(first && result.isdone()) System.out.print("Here it is : "); System.out.println(result.getResult()); first = false; System.out.println("End of main"); 16 / 22
17 Exercise 7 public interface DoSomethingResultInterface extends Remote public boolean isdone() throws RemoteException; public String getresult() throws RemoteException; public void waitforresult() throws RemoteException; import java.rmi.server.*; public class DoSomethingResultImpl extends UnicastRemoteObject implements DoSomethingResultInterface,Runnable private String param; private String result; private boolean done; public DoSomethingResultImpl(String param) throws RemoteException super(); this.param = param; done = false; public synchronized boolean isdone() throws RemoteException System.out.println("isDone"); return done; public synchronized String getresult() throws RemoteException System.out.println("getResult"); return result; public synchronized void waitforresult() throws RemoteException System.out.println("waitForResult"); while(!done) try wait(); catch(interruptedexception e) public void run() try Thread.sleep(5000); catch(interruptedexception e) synchronized(this) result = "["+param+"]"; done = true; notify(); 17 / 22
18 public class Client PullServerInterface server = (PullServerInterface)Naming.lookup("rmi:// :1234/ServerPull"); System.out.println("Starting the call"); DoSomethingResultInterface result = server.dosomething("hello World!"); boolean first = true; for(int i=1;i<=5;i++) System.out.println(i); try Thread.sleep(500); catch (InterruptedException e) System.out.println("Waiting the result"); if(first && result.isdone()) System.out.print("Here it is : "); System.out.println(result.getResult()); first = false; if(first) System.out.println("Still no result, switching to passive waiting... "); result.waitforresult(); System.out.print("Here it is : "); System.out.println(result.getResult()); System.out.println("End of main"); 18 / 22
19 Exercise 8 public interface PushServerInterface extends Remote public void dosomething(string param, DoSomethingCallbackInterface callback) throws RemoteException; import java.rmi.server.*; public class PushServerImpl extends UnicastRemoteObject implements PushServerInterface public PushServerImpl() throws RemoteException super(); public void dosomething(string param, DoSomethingCallbackInterface callback) throws RemoteException System.out.println("Ping"); DoSomething support = new DoSomething(param,callback); support.start(); System.out.println("Pong"); PushServerImpl server = new PushServerImpl(); Naming.rebind("rmi:// :1234/ServerPush",server); System.out.println("Server Started"); public class DoSomething extends Thread private String param; private DoSomethingCallbackInterface callback; public DoSomething(String param,dosomethingcallbackinterface callback) this.param = param; this.callback = callback; public void run() try Thread.sleep(5000); catch(interruptedexception e) try callback.reportcompletion(param); catch(remoteexception e) System.err.println("Cannot report completion: "+e); 19 / 22
20 public interface DoSomethingCallbackInterface extends Remote public void reportcompletion(string result) throws RemoteException; import java.rmi.server.*; public class DoSomethingCallbackImpl extends UnicastRemoteObject implements DoSomethingCallbackInterface public DoSomethingCallbackImpl() throws RemoteException super(); public void reportcompletion(string result) throws RemoteException System.out.println(result); public class Client DoSomethingCallbackImpl callback = new DoSomethingCallbackImpl(); PushServerInterface server = (PushServerInterface)Naming.lookup("rmi:// :1234/ServerPush"); System.out.println("Starting the call"); server.dosomething("hello World! ",callback); for(int i=1;i<=5;i++) System.out.println(i); try Thread.sleep(1500); catch (InterruptedException e) System.out.println("End of main"); 20 / 22
21 Exercise 9 import java.rmi.server.*; public class DoSomethingCallbackImpl extends UnicastRemoteObject implements DoSomethingCallbackInterface private String result; private boolean done; public DoSomethingCallbackImpl() throws RemoteException super(); done = false; public synchronized void reportcompletion(string result) throws RemoteException System.out.println("reportCompletion"); done = true; this.result = result; notify(); public synchronized boolean isdone() return done; public synchronized String getresult() return result; public synchronized void waitforresult() while(!done) try wait(); catch(interruptedexception e) public class Client DoSomethingCallbackImpl callback = new DoSomethingCallbackImpl(); PushServerInterface server = (PushServerInterface)Naming.lookup("rmi:// :1234/ServerPush"); System.out.println("Starting the call"); 21 / 22
22 server.dosomething("hellow World!",callback); boolean first = true; for(int i=1;i<=5;i++) System.out.println(i); try Thread.sleep(500); catch (InterruptedException e) System.out.println("Waiting for the result"); if(first && callback.isdone()) System.out.print("Here it is : "); System.out.println(callback.getResult()); first = false; if(first) System.out.println("Still no result, switching to passive waiting... "); callback.waitforresult(); System.out.print("Here it is : "); System.out.println(callback.getResult()); System.out.println("End of main"); 22 / 22
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