/**
* Deregistra un player dal server, rendendo nuovamente disponibile il nickname ad altri player.
*
* @param nickname nome del player da deregistrare
*/
public void deregisterPlayer(String nickname) {
try {
server.deregister(nickname);
} catch (RemoteException e) {
System.out.println("Impossible to logout." + e.getMessage());
}
}
/**
* Create a MonitoredHostProvider instance using the given HostIdentifier.
*
* @param hostId the host identifier for this MonitoredHost
* @throws MonitorException Thrown on any error encountered while communicating with the remote
* host.
*/
public MonitoredHostProvider(HostIdentifier hostId) throws MonitorException {
this.hostId = hostId;
this.listeners = new ArrayList();
this.interval = DEFAULT_POLLING_INTERVAL;
this.activeVms = new HashSet();
String rmiName;
String sn = serverName;
String path = hostId.getPath();
if ((path != null) && (path.length() > 0)) {
sn = path;
}
if (hostId.getPort() != -1) {
rmiName = "rmi://" + hostId.getHost() + ":" + hostId.getPort() + sn;
} else {
rmiName = "rmi://" + hostId.getHost() + sn;
}
try {
remoteHost = (RemoteHost) Naming.lookup(rmiName);
} catch (RemoteException e) {
/*
* rmi registry not available
*
* Access control exceptions, where the rmi server refuses a
* connection based on policy file configuration, come through
* here on the client side. Unfortunately, the RemoteException
* doesn't contain enough information to determine the true cause
* of the exception. So, we have to output a rather generic message.
*/
String message = "RMI Registry not available at " + hostId.getHost();
if (hostId.getPort() == -1) {
message = message + ":" + java.rmi.registry.Registry.REGISTRY_PORT;
} else {
message = message + ":" + hostId.getPort();
}
if (e.getMessage() != null) {
throw new MonitorException(message + "\n" + e.getMessage(), e);
} else {
throw new MonitorException(message, e);
}
} catch (NotBoundException e) {
// no server with given name
String message = e.getMessage();
if (message == null) message = rmiName;
throw new MonitorException("RMI Server " + message + " not available", e);
} catch (MalformedURLException e) {
// this is a programming problem
e.printStackTrace();
throw new IllegalArgumentException("Malformed URL: " + rmiName);
}
this.vmManager = new RemoteVmManager(remoteHost);
this.timer = new Timer(true);
}
/**
* ***************************************************************
*
* @param ip
* @param port
* @return
*/
public ChordMessageInterface rmiChord(String ip, int port) {
ChordMessageInterface chord = null;
try {
Registry registry = LocateRegistry.getRegistry(ip, port);
chord = (ChordMessageInterface) (registry.lookup("Chord"));
return chord;
} catch (RemoteException e) {
e.printStackTrace();
} catch (NotBoundException e) {
e.printStackTrace();
}
return null;
}
public static void main(String[] args) {
String host = args[0];
int port = Integer.parseInt(args[1]);
if (System.getSecurityManager() == null) {
System.setSecurityManager(new RMISecurityManager());
}
String name = "//" + host + ":" + port + "/EquationSolver";
double[][] A = {
{4.0, 3.0, 1.0},
{2.0, -6.0, 4.0},
{7.0, 5.0, 3.0}
};
double[] b = {17.0, 8.0, 32.0};
try {
EquationSolver solver = (EquationSolver) Naming.lookup(name);
double[] x = solver.solve(A, b);
StringBuffer sb = new StringBuffer();
for (int i = 0; i < x.length; i++) {
sb.append(x[i]);
sb.append(' ');
}
System.out.println(sb);
} catch (RemoteException ex) {
ex.printStackTrace(System.err);
} catch (NotBoundException ex) {
ex.printStackTrace(System.err);
} catch (MalformedURLException ex) {
ex.printStackTrace(System.err);
}
}
/**
* @param argv The parameters passed to this program.
* @exception Exception if the filesystem does not exist.
* @return 0 on success, non zero on error.
*/
private int processArgs(String[] argv) throws Exception {
if (argv.length < 1) {
printUsage("");
return -1;
}
int exitCode = -1;
int i = 0;
String cmd = argv[i++];
//
// verify that we have enough command line parameters
//
if ("-geteditsize".equals(cmd)) {
if (argv.length != 1) {
printUsage(cmd);
return exitCode;
}
} else if ("-checkpoint".equals(cmd)) {
if (argv.length != 1 && argv.length != 2) {
printUsage(cmd);
return exitCode;
}
if (argv.length == 2 && !"force".equals(argv[i])) {
printUsage(cmd);
return exitCode;
}
}
exitCode = 0;
try {
if ("-checkpoint".equals(cmd)) {
long size = namenode.getEditLogSize();
if (size >= checkpointSize || argv.length == 2 && "force".equals(argv[i])) {
doCheckpoint();
} else {
System.err.println(
"EditLog size "
+ size
+ " bytes is "
+ "smaller than configured checkpoint "
+ "size "
+ checkpointSize
+ " bytes.");
System.err.println("Skipping checkpoint.");
}
} else if ("-geteditsize".equals(cmd)) {
long size = namenode.getEditLogSize();
System.out.println("EditLog size is " + size + " bytes");
} else {
exitCode = -1;
LOG.error(cmd.substring(1) + ": Unknown command");
printUsage("");
}
} catch (RemoteException e) {
//
// This is a error returned by hadoop server. Print
// out the first line of the error mesage, ignore the stack trace.
exitCode = -1;
try {
String[] content;
content = e.getLocalizedMessage().split("\n");
LOG.error(cmd.substring(1) + ": " + content[0]);
} catch (Exception ex) {
LOG.error(cmd.substring(1) + ": " + ex.getLocalizedMessage());
}
} catch (IOException e) {
//
// IO exception encountered locally.
//
exitCode = -1;
LOG.error(cmd.substring(1) + ": " + e.getLocalizedMessage());
} finally {
// Does the RPC connection need to be closed?
}
return exitCode;
}
