src/and/hpcvm/Server.java

   1 package and.hpcvm ;
   2
   3 import java.io.BufferedReader;
   4 import java.io.File;
   5 import java.io.IOException;
   6 import java.io.InputStreamReader;
   7 import java.rmi.Naming;
   8 import java.rmi.RemoteException;
   9 import java.rmi.registry.LocateRegistry;
  10 import java.rmi.registry.Registry;
  11 import java.rmi.server.UnicastRemoteObject;
  12 import java.util.ArrayList;
  13 import java.util.Iterator;
  14 import java.util.concurrent.Semaphore;
  15
  16
  17 public class Server extends UnicastRemoteObject implements ServicesServer
  18 {
  19         private class DiscCount
  20         {
  21                 private int nb ;
  22
  23                 DiscCount() { nb = 0 ; }
  24
  25                 protected void inc() { nb++ ; }
  26
  27                 protected void dec() {
  28                         if( nb > 0 )
  29                         {
  30                                 nb-- ;
  31                         }
  32                 }
  33
  34                 protected int getNb() { return nb ; }
  35         }
  36
  37
  38         private class IPAssociation
  39         {
  40                 private String vmIP ;
  41                 private String hostIP ;
  42
  43                 IPAssociation()
  44                 {
  45                         vmIP = "" ;
  46                         hostIP = "" ;
  47                 }
  48
  49                 protected void setVmIP( String _vmIP )
  50                 {
  51                         vmIP = _vmIP ;
  52                 }
  53
  54                 protected void setHostIP( String _hostIP )
  55                 {
  56                         hostIP = _hostIP ;
  57                 }
  58
  59                 protected String getVmIP()
  60                 {
  61                         return vmIP ;
  62                 }
  63
  64                 protected String getHostIP()
  65                 {
  66                         return hostIP ;
  67                 }
  68         }
  69
  70
  71
  72         private static final long serialVersionUID = 1L ;
  73         private int port ;
  74         private ArrayList<ConnectedClient> clients ;
  75         private ArrayList<ComputingClient> computingClients ;
  76         private ArrayList<RunningApplication> applications ;
  77         private int max_timeout ;
  78         private ConnectedMonitor monitor ;
  79         private DiscCount counter ;
  80         private ArrayList<IPAssociation> vmIPs ;
  81         private String working_directory ;
  82         private long save_interleave ;
  83         private Semaphore semaSave ;
  84         private OperatingClients startingClients ;
  85         private OperatingClients deployingClients ;
  86         private LimitThread limitThread ;
  87         private int maxThread ;
  88         private int ind ;
  89         private boolean running ;
  90
  91
  92         protected Server() throws RemoteException
  93         {
  94                 super() ;
  95         }
  96
  97
  98
  99         @Override
 100         public Integer register( ServicesClient _stub )
 101         {
 102                 if( _stub != null )
 103                 {
 104                         synchronized( clients )
 105                         {
 106                                 String ip = "" ;
 107                                 try {
 108                                         ip = _stub.getIPHost() ;
 109                                 } catch (RemoteException e) {
 110                                         e.printStackTrace() ;
 111                                         return 1 ;
 112                                 }
 113
 114                                 boolean exists = false ;
 115                                 int i ;
 116
 117                                 for( i = 0 ; i < clients.size() ; i++ )
 118                                 {
 119                                         if( ip.equals( clients.get( i ).getIP() ) )
 120                                         {
 121                                                 exists = true ;
 122                                                 System.out.println( "Client already connected!" ) ;
 123                                                 break ;
 124                                         }
 125                                 }
 126
 127                                 if( exists )
 128                                 {
 129                                         System.out.println( "The client stub will be replaced." ) ;
 130                                         clients.get( i ).setStub( _stub ) ;
 131                                         System.out.println( "(reconnection of " + clients.get( i ).getName() + ")" ) ;
 132                                         return 2 ;
 133                                 } else {
 134                                         System.out.println( "New connection!" ) ;
 135                                         clients.add( new ConnectedClient( _stub ) ) ;
 136                                         System.out.println( "(connection of " + clients.get( clients.size() - 1 ).getName() + ")" ) ;
 137                                         generateVmIP( ip ) ;
 138
 139                                         if( clients.size() == 0 )
 140                                         {
 141                                                 System.out.println( "There is no client connected." ) ;
 142                                         } else if( clients.size() == 1 ) {
 143                                                 System.out.println( "There is one client connected." ) ;
 144                                         } else {
 145                                                 System.out.println( "There are " + clients.size() + " clients connected." ) ;
 146                                         }
 147
 148                                         return 0 ;
 149                                 }
 150                         }
 151                 }
 152
 153                 return 1 ;
 154         }
 155
 156
 157         private void generateVmIP( String _ip )
 158         {
 159                 if( _ip != null && ! _ip.equals( "" ) )
 160                 {
 161                         for( int i = 0 ; i < vmIPs.size() ; i++ )
 162                         {
 163                                 if( vmIPs.get( i ).getHostIP().equalsIgnoreCase( "" ) )
 164                                 {
 165                                         vmIPs.get( i ).setHostIP( _ip ) ;
 166
 167                                         break ;
 168                                 }
 169                         }
 170                 }
 171         }
 172
 173
 174         @Override
 175         public void ping( String _ip )
 176         {
 177                 if( _ip != null )
 178                 {
 179                         for( int i = 0 ; i < clients.size() ; i++ )
 180                         {
 181                                 if( _ip.equals( clients.get( i ).getIP() ) )
 182                                 {
 183                                         clients.get( i ).resetTimeout() ;
 184                                         break ;
 185                                 }
 186                         }
 187                 }
 188         }
 189
 190
 191         @Override
 192         public void changeStatus( String _ip, String _status )
 193         {
 194                 if( _ip != null && _status != null )
 195                 {
 196                         for( int i = 0 ; i < clients.size() ; i++ )
 197                         {
 198                                 if( _ip.equals( clients.get( i ).getIP() ) )
 199                                 {
 200                                         clients.get( i ).setStatus( _status ) ;
 201                                         System.out.println( "Client " + clients.get( i ).getName() + " changed its status to: " + _status ) ;
 202
 203                                         break ;
 204                                 }
 205                         }
 206                 }
 207         }
 208
 209
 210         public void init( int _port )
 211         {
 212                 port = _port ;
 213                 max_timeout = 4 ;
 214
 215                 clients = new ArrayList<ConnectedClient>() ;
 216                 computingClients = new ArrayList<ComputingClient>() ;
 217                 applications = new ArrayList<RunningApplication>() ;
 218                 monitor = null ;
 219
 220                 startingClients = new OperatingClients() ;
 221                 deployingClients = new OperatingClients() ;
 222                 limitThread = new LimitThread() ;
 223                 maxThread = 20 ;
 224
 225                 ind = -1 ;
 226                 running = false ;
 227
 228                 working_directory = "/localhome/vmware" ;
 229
 230                 save_interleave  = 30 * 60 * 1000 ;
 231
 232                 semaSave = new Semaphore( 1 ) ;
 233
 234                 exportObject() ;
 235
 236                 vmIPs = new ArrayList<IPAssociation>() ;
 237                 // TODO initialisation of VM IPs
 238                 for( int i = 2 ; i < 101 ; i++ )
 239                 {
 240                         vmIPs.add( new IPAssociation() ) ;
 241                         vmIPs.get( vmIPs.size() - 1 ).setVmIP( "10.11.10." + i ) ;
 242                 }
 243
 244                 clients = new ArrayList<ConnectedClient>() ;
 245
 246                 counter = new DiscCount() ;
 247
 248                 monitor = new ConnectedMonitor() ;
 249                 monitor.start() ;
 250
 251                 // TODO
 252                 // Check if there are running applications ... and restart them :)
 253         }
 254
 255
 256         public void stop()
 257         {
 258                 if( monitor != null ) { monitor.stopMonitor() ; }
 259
 260                 for( int i = 0 ; i < clients.size() ; i++ )
 261                 {
 262                         try {
 263                                 clients.get( i ).getStub().emergencyStop() ;
 264                                 clients.get( i ).getStub().stop() ;
 265                         } catch (RemoteException e) {
 266                                 e.printStackTrace();
 267                         }
 268                 }
 269
 270                 // unexportObject ?
 271
 272                 System.exit( 0 ) ;
 273         }
 274
 275
 276         private void exportObject()
 277         {
 278                 ServicesServer ref = null ;
 279                 Registry reg = null ;
 280
 281                 try
 282                 {
 283                         while( true )
 284                         {
 285                                 reg = LocateRegistry.getRegistry( port ) ;
 286
 287                                 String tab[] = reg.list() ;
 288
 289                                 System.out.println( "There is an existing RMI Registry on port " +
 290                                                 port + " with " + tab.length + " entries!" ) ;
 291                                 for( int i = 0 ; i < tab.length ; i++ )
 292                                 {
 293                                         try {
 294                                                 if( UnicastRemoteObject.unexportObject( Naming.lookup(tab[i]), true ) )
 295                                                 {
 296                                                         System.out.println( "Register successfuly deleted!" ) ;
 297                                                 } else {
 298                                                         System.err.println( "Register undeleted !!!" ) ;
 299                                                 }
 300                                         } catch( Exception e ) {
 301                                                 e.printStackTrace() ;
 302                                         }
 303                                 }
 304                         }
 305                 } catch( RemoteException e ) {
 306                 }
 307
 308                 try {
 309                         if ( System.getSecurityManager() == null )
 310                         {
 311                     System.setSecurityManager( new SecurityManager() ) ;
 312                 }
 313
 314                         LocateRegistry.createRegistry( port ) ;
 315                         LocateRegistry.getRegistry( port ).rebind( "Server", this ) ;
 316                         ref = (ServicesServer) Naming.lookup( "rmi://"
 317                                         + LocalHost.Instance().getIP() + ":" + port
 318                                         + "/Server" ) ;
 319                 } catch ( Exception e ) {
 320                         System.err.println( "Error in Server.exportObject() when creating local services:" + e ) ;
 321                         System.err.println( "Exit from Server.exportObject" ) ;
 322                         System.exit( 1 ) ;
 323                 }
 324
 325                 LocalHost.Instance().setServerStub( ref ) ;
 326
 327                 System.out.println( "Server launched on IP " + LocalHost.Instance().getIP() +
 328                                 " on port " + port + "." ) ;
 329         }
 330
 331         /** Fault manager thread **/
 332         private class FaultManager extends Thread
 333         {
 334                 ConnectedClient cl ;
 335
 336                 FaultManager( ConnectedClient _cl )
 337                 {
 338                         cl = _cl ;
 339                 }
 340
 341                 @Override
 342                 public void run()
 343                 {
 344                         if( cl != null && cl.getStatus().equalsIgnoreCase( "running" ) ||
 345                                         cl.getStatus().equalsIgnoreCase( "saving" ) )
 346                         {
 347                                 ComputingClient cc = cl.getComputingClient() ;
 348 //                              ServicesClient dead = cc.getClient().getStub() ;
 349                                 String ipDead = cc.getClient().getIP() ;
 350                                 SaveNeighbor snDead = null ;
 351                                 for( int i = 0 ; i < computingClients.size() ; i++ )
 352                                 {
 353                                         if( computingClients.get( i ).getSaveNeighbor().getIPHost().equalsIgnoreCase( ipDead ) )
 354                                         {
 355                                                 snDead = computingClients.get( i ).getSaveNeighbor() ;
 356                                                 break ;
 357                                         }
 358                                 }
 359
 360                                 boolean ok = false ;
 361
 362                                 for( int i = 0 ; i < clients.size() ; i++ )
 363                                 {
 364                                         if( clients.get( i ).getStatus().equalsIgnoreCase( "connected" ) )
 365                                         {
 366 //                                              int res = 1 ;
 367 //                                              try {
 368 //                                                      res = clients.get( i ).getStub().startVM() ;
 369 //                                              } catch( RemoteException e ) {
 370 //                                                      e.printStackTrace();
 371 //                                              }
 372 //
 373 //                                              if( res == 0 )
 374 //                                              {
 375                                                         //clients.get(i).setStatus( "running" ) ;
 376
 377                                                 int pos = computingClients.indexOf( cc )  ;
 378                                                 if( pos == -1 )
 379                                                 {
 380                                                         System.err.println( "Dead client not found in the computing clients list!" ) ;
 381                                                 } else {
 382                                                         System.out.println( "Trying to replace " + cc.getClient().getName() + " with " +
 383                                                                         clients.get(i).getName() + " ... " ) ;
 384
 385                                                         String save_name = computingClients.get( pos ).getLastSave() ;
 386
 387                                                         ComputingClient ccl = new ComputingClient( clients.get(i) ) ;
 388                                                         clients.get( i ).setComputingClient( ccl ) ;
 389                                                         SaveNeighbor sn = computingClients.get( pos ).getSaveNeighbor() ;
 390                                                         ccl.setSaveNeighbor( sn ) ;
 391                                                         computingClients.set( pos, ccl ) ;
 392
 393
 394                                                         int res = 1 ;
 395                                                         try {
 396                                                                 res = computingClients.get( pos ).getClient().getStub().
 397                                                                       retrieveSave( save_name ) ;
 398                                                         } catch( RemoteException e ) {
 399                                                                 System.err.println( "Unable to indicate to client to retrieve last save!" ) ;
 400                                                                 e.printStackTrace() ;
 401                                                         }
 402
 403                                                         if( res == 0 )
 404                                                         {
 405                                                                 ok = true ;
 406
 407                                                                 boolean ok_new = false, ok_old = false ;
 408
 409                                                                 // replace dead client in vmIPs
 410                                                                 for( int j = 0 ; j < vmIPs.size() ; j++ )
 411                                                                 {
 412                                                                         if( vmIPs.get( j ).getHostIP().equalsIgnoreCase( computingClients.get( pos ).getClient().getIP() ) )
 413                                                                         {
 414                                                                                 vmIPs.get( j ).setHostIP( "" ) ;
 415                                                                                 ok_new = true ;
 416                                                                         }
 417                                                                         if( vmIPs.get( j ).getHostIP().equalsIgnoreCase( ipDead ) )
 418                                                                         {
 419                                                                                 String vmIP = vmIPs.get( j ).getVmIP() ;
 420                                                                                 vmIPs.get( j ).setHostIP( computingClients.get( pos ).getClient().getIP() ) ;
 421                                                                                 ok_old = true ;
 422
 423                                                                                 try {
 424                                                                                         computingClients.get( pos ).getClient().getStub().setIPVM( vmIP ) ;
 425                                                                                 } catch( RemoteException e ) {
 426                                                                                         System.err.println( "Unable to set the new VM IP on the replacing client!" ) ;
 427                                                                                         e.printStackTrace() ;
 428                                                                                 }
 429
 430                                                                                 if( ok_new && ok_old )
 431                                                                                 {
 432                                                                                         break ;
 433                                                                                 }
 434                                                                         }
 435                                                                 }
 436
 437                                                                 // Replacing in RunningApplication
 438                                                                 applications.get( ind ).replaceComputingClient( cc, ccl ) ;
 439
 440                                                                 for( int l = 0 ; l < applications.get( ind ).getComputingClients().size() ; l++ )
 441                                                                 {
 442                                                                         applications.get( ind ).getComputingClients().get( l ).setSaveRequest( false ) ;
 443                                                                 }
 444
 445
 446                                                                 System.out.println( "Successful redeployment of the VM." ) ;
 447                                                         } else {
 448                                                                 System.err.println( "Unable to deploy the save on the new computing client!" ) ;
 449                                                         }
 450                                                 }
 451
 452                                                 if( ok )
 453                                                 {
 454                                                         for( int k = 0 ; k < computingClients.size() ; k++ )
 455                                                         {
 456                                                                 try {
 457                                                                         computingClients.get( k ).getClient().getStub().
 458                                                                                 replaceSaveNeighbor( snDead, new SaveNeighbor( clients.get( i ).getStub() ) ) ;
 459                                                                 } catch( RemoteException e ) {
 460                                                                         System.err.println( "Unable to inform " + computingClients.get( k ).getClient().getName() +
 461                                                                                         " of the replacement of a save neighbor!" ) ;
 462                                                                         e.printStackTrace() ;
 463                                                                 }
 464                                                         }
 465
 466                                                         System.out.println( "Dead client successfully replaced." ) ;
 467
 468                                                         break ;
 469                                                 } else {
 470                                                         System.err.println( "Dead client not replaced!!" ) ;
 471                                                 }
 472                                         }
 473                                 }
 474                         }
 475
 476                         try {
 477                                 synchronized( counter ) {
 478                                         counter.dec() ;
 479                                         counter.notifyAll() ;}
 480                         } catch( Exception e ) {}
 481                 }
 482         }
 483
 484
 485         /** Monitoring thread **/
 486         private class ConnectedMonitor extends Thread
 487         {
 488                 boolean run ;
 489
 490                 ConnectedMonitor()
 491                 {
 492                         run = true ;
 493                 }
 494
 495                 protected void stopMonitor() { run = false ; }
 496
 497                 @Override
 498                 public void run()
 499                 {
 500                         boolean change ;
 501
 502                         while( run )
 503                         {
 504                                 change = false ;
 505                                 Iterator<ConnectedClient> it = clients.iterator() ;
 506                                 int nb_disconnections = 0 ;
 507                                 int nb_disconnections_computing = 0 ;
 508
 509                                 while( it.hasNext() )
 510                                 {
 511                                         ConnectedClient cl = it.next() ;
 512                                         cl.incTimeout() ;
 513
 514                                         if( cl.getTimeout() > max_timeout )
 515                                         {
 516                                                 System.out.println( "Disconnection of " + cl.getName() ) ;
 517                                                 if( cl.getStatus().equalsIgnoreCase( "running" ) || cl.getStatus().equalsIgnoreCase( "saving" ) )
 518                                                 {
 519                                                         System.out.println( "A VM was running on it!!" ) ;
 520                                                         System.out.println( "I will redeploy a save and restart all VM ..." ) ;
 521
 522 //                                                      for( int i = 0 ; i < computingClients.size() ; i++ )
 523 //                                                      {
 524 //                                                              if( computingClients.get( i ).getClient().getIP().equals( cl.getIP() ) )
 525 //                                                              {
 526 //                                                                      computingClients.remove( i ) ;
 527 //                                                                      break ;
 528 //                                                              }
 529 //                                                      }
 530                                                         synchronized( counter ){
 531                                                                 counter.inc() ;}
 532
 533
 534                                                         new Server.FaultManager( cl ).start() ;
 535                                                         nb_disconnections_computing++ ;
 536                                                 } else {
 537                                                         System.out.println( "There was no VM running on it." ) ;
 538                                                         System.out.println( "Maybe it will come back later :)" ) ;
 539                                                 }
 540
 541                                                 synchronized( clients )
 542                                                 {
 543                                                         it.remove() ;
 544                                                 }
 545                                                 nb_disconnections++ ;
 546                                                 change = true ;
 547                                         }
 548                                 }
 549
 550                                 if( change )
 551                                 {
 552                                         synchronized( clients )
 553                                         {
 554                                                 if( clients.size() == 0 )
 555                                                 {
 556                                                         System.out.println( "There is no client connected." ) ;
 557                                                 } else if( clients.size() == 1 ) {
 558                                                         System.out.println( "There is one client connected." ) ;
 559                                                 } else {
 560                                                         System.out.println( "There are " + clients.size() + " clients connected." ) ;
 561                                                 }
 562                                         }
 563                                 }
 564
 565
 566                                 if( nb_disconnections_computing > 0 )
 567                                 {
 568                                         System.out.println( "Sending emergency stop signal to all computing nodes ... " ) ;
 569
 570                                         for( int i = 0 ; i < clients.size() ; i++ )
 571                                         {
 572                                                 if( clients.get( i ).getStatus().equalsIgnoreCase( "running" )
 573                                                         || clients.get( i ).getStatus().equalsIgnoreCase( "saving" ) )
 574                                                 {
 575                                                         try {
 576                                                                 clients.get( i ).getStub().emergencyStop() ;
 577                                                         } catch( RemoteException e ) {
 578                                                                 System.err.println( "Unable to invoke emergency stop signal on " + clients.get( i ).getName() ) ;
 579                                                                 e.printStackTrace() ;
 580                                                         }
 581                                                 }
 582                                         }
 583
 584                                         System.out.println( "I will redeploy save and restart VMs ... " ) ;
 585
 586                                         synchronized( counter )
 587                                         {
 588                                                 if( counter.getNb() > 0 )
 589                                                 {
 590                                                         System.out.println( "... waiting all redeployments done ..." ) ;
 591                                                 }
 592
 593                                                 while( counter.getNb() != 0 )
 594                                                 {
 595                                                         try {
 596                                                                 counter.wait() ;
 597                                                         } catch( InterruptedException e ) {
 598                                                                 e.printStackTrace() ;
 599                                                         }
 600                                                 }
 601                                         }
 602
 603                                         for( int i = 0 ; i < applications.get( ind ).getComputingClients().size() ; i++ )
 604                                         {
 605                                                 final ServicesClient sc = applications.get( ind ).getComputingClients().get( i ).getClient().getStub() ;
 606
 607                                                 applications.get( ind ).getComputingClients().get( i ).setRestartOk( false ) ;
 608
 609                                                 new Thread( new Runnable() {
 610
 611                                                         @Override
 612                                                         public void run()
 613                                                         {
 614                                                                 try {
 615                                                                         sc.restartVMAfterCrash() ;
 616                                                                 } catch( RemoteException e ) {
 617                                                                         e.printStackTrace() ;
 618                                                                 }
 619                                                         }
 620                                                 } ).start() ;
 621                                         }
 622                                 }
 623
 624                                 try
 625                                 {
 626                                         Thread.sleep( 2000 ) ;
 627                                 } catch( InterruptedException e ) {
 628                                         e.printStackTrace() ;
 629                                 }
 630                         }
 631                 }
 632         }
 633
 634         @Override
 635         public Integer saveOk( String _ip, String _saveName )
 636         {
 637                 int i ;
 638                 for( i = 0 ; i < computingClients.size() ; i ++ )
 639                 {
 640                         if( computingClients.get( i ).getClient().getIP().equalsIgnoreCase( _ip ) )
 641                         {
 642                                 computingClients.get( i ).setLastSave( _saveName ) ;
 643                                 computingClients.get( i ).setSaveStatus( true ) ;
 644                                 break ;
 645                         }
 646                 }
 647
 648
 649                 boolean all_ok = true ;
 650                 i = 0 ;
 651
 652                 while( all_ok && i < computingClients.size() )
 653                 {
 654                         all_ok = all_ok & computingClients.get( i ).getSaveStatus() ;
 655                         i++ ;
 656                 }
 657
 658                 if( all_ok )
 659                 {
 660                         for( i = 0 ; i < computingClients.size() ; i++ )
 661                         {
 662                                 try {
 663                                         computingClients.get( i ).getClient().getStub().saveOk() ;
 664                                 } catch (RemoteException e) {
 665                                         e.printStackTrace();
 666                                 }
 667                                 computingClients.get( i ).setSaveStatus( false ) ;
 668                         }
 669
 670                         applications.get( ind ).setLastSaveDate( System.currentTimeMillis() ) ;
 671                 }
 672
 673                 return 0 ;
 674         }
 675
 676
 677         public Integer changeSaveName( String _ip, String _saveName )
 678         {
 679                 if( _ip != null && _ip.length() > 0 && _saveName != null && _saveName.length() > 0 )
 680                 {
 681                         for( int i = 0 ; i < computingClients.size() ; i ++ )
 682                         {
 683                                 if( computingClients.get( i ).getClient().getIP().equalsIgnoreCase( _ip ) )
 684                                 {
 685                                         computingClients.get( i ).setLastSave( _saveName ) ;
 686                                         System.out.println( "Save name successfully changed on " + computingClients.get( i ).getClient().getName() ) ;
 687                                         return 0 ;
 688                                 }
 689                         }
 690
 691                         System.err.println( "Unable to found computing client with IP " + _ip + "!" ) ;
 692                         return 1 ;
 693                 }
 694
 695                 System.err.println( "Unable to change save name. IP or save name empty ! (IP: " + _ip + " ; save name: " + _saveName +")" ) ;
 696
 697                 return 1 ;
 698         }
 699
 700         @Override
 701         public ArrayList<ServicesClient> startApplication( int _nb )
 702         {
 703                 int nb = clients.size() - computingClients.size() ;
 704
 705                 if( nb > _nb && ! running )
 706                 {
 707                         running = true ;
 708
 709                         final ArrayList<ServicesClient> ac = new ArrayList<ServicesClient>() ;
 710                         final ArrayList<ComputingClient> tmp = new ArrayList<ComputingClient>() ;
 711
 712                         RunningApplication app = new RunningApplication( "Test" ) ;
 713
 714                         int i = 0 ;
 715                         boolean ok ;
 716
 717                         while( i < clients.size() && ac.size() < _nb )
 718                         {
 719                                 ok = false ;
 720                                 if( clients.get( i ).getStatus().equalsIgnoreCase( "connected" ) )
 721                                 {
 722                                         synchronized( startingClients )
 723                                         {
 724                                                 while( ac.size() + startingClients.getNb() >= _nb )
 725                                                 {
 726                                                         if( ac.size() == _nb ) break ;
 727
 728                                                         try {
 729                                                                 startingClients.wait() ;
 730                                                         } catch (InterruptedException e) {
 731                                                                 e.printStackTrace();
 732                                                         }
 733                                                 }
 734
 735                                                 if( ac.size() < _nb )
 736                                                 {
 737                                                         startingClients.inc() ;
 738                                                         ok = true ;
 739                                                 }
 740                                         }
 741
 742                                         if( ok )
 743                                         {
 744                                                 synchronized( limitThread )
 745                                                 {
 746                                                         while( limitThread.getNb() >= maxThread )
 747                                                         {
 748                                                                 try {
 749                                                                         limitThread.wait() ;
 750                                                                 } catch (InterruptedException e) {
 751                                                                         e.printStackTrace();
 752                                                                 }
 753                                                         }
 754
 755                                                         limitThread.inc() ;
 756                                                 }
 757
 758                                                 final int indice = i ;
 759                                                 new Thread( new Runnable(){
 760
 761                                                         @Override
 762                                                         public void run()
 763                                                         {
 764                                                                 int res = 1 ;
 765                                                                 try {
 766                                                                         res = clients.get( indice ).getStub().startVM( 0 ) ;
 767                                                                 } catch( RemoteException e ) {
 768                                                                         e.printStackTrace();
 769                                                                 }
 770
 771                                                                 if( res == 0 )
 772                                                                 {
 773                                                                         ac.add( clients.get( indice ).getStub() ) ;
 774                                                                         clients.get( indice ).setStatus( "running" ) ;
 775                                                                         ComputingClient cl = new ComputingClient( clients.get( indice ) ) ;
 776                                                                         clients.get( indice ).setComputingClient( cl ) ;
 777                                                                         computingClients.add( cl ) ;
 778                                                                         tmp.add( cl ) ;
 779                                                                 } else {
 780                                                                         System.err.println( "Problem while launching the VM on "
 781                                                                                         + clients.get( indice ).getName() + "!" ) ;
 782                                                                 }
 783
 784                                                                 synchronized( limitThread )
 785                                                                 {
 786                                                                         limitThread.dec() ;
 787                                                                         limitThread.notifyAll() ;
 788                                                                 }
 789
 790                                                                 synchronized( startingClients )
 791                                                                 {
 792                                                                         startingClients.dec() ;
 793                                                                         startingClients.notifyAll() ;
 794                                                                 }
 795                                                         }
 796                                                 }).start() ;
 797                                         }
 798                                 }
 799
 800                                 i++ ;
 801                         }
 802
 803                         if( ac.size() == _nb )
 804                         {
 805                                 app.setComputingClients( tmp ) ;
 806                                 app.setRunning( true ) ;
 807 //                              app.setStartTime( System.currentTimeMillis() ) ;
 808
 809                                 int index, index2 ;
 810                                 /* Choosing save neighbors */
 811                                 for( i = 0 ; i < tmp.size() ; i++ )
 812                                 {
 813                                         if( i == tmp.size() - 1 )
 814                                         {
 815                                                 index = computingClients.indexOf( tmp.get( i ) ) ;
 816                                                 index2 = computingClients.indexOf( tmp.get( 0 ) ) ;
 817
 818                                                 if( index == -1 || index2 == -1 )
 819                                                 {
 820                                                         System.err.println( "Problem in ComputingClients list!" ) ;
 821                                                 } else {
 822                                                         try {
 823                                                                 computingClients.get( index ).setSaveNeighbor( new SaveNeighbor( computingClients.get( index2 ).getClient().getStub() )) ;
 824                                                         } catch( RemoteException e ) {
 825                                                                 System.err.println( "Unable to create the save neighbor!" ) ;
 826                                                                 e.printStackTrace() ;
 827                                                         }
 828                                                 }
 829                                         } else {
 830                                                 index = computingClients.indexOf( tmp.get( i ) ) ;
 831                                                 index2 = computingClients.indexOf( tmp.get( i + 1 ) ) ;
 832
 833                                                 if( index == -1 || index2 == -1 )
 834                                                 {
 835                                                         System.err.println( "Problem in ComputingClients list!" ) ;
 836                                                 } else {
 837                                                         try {
 838                                                                 computingClients.get( index ).setSaveNeighbor( new SaveNeighbor( computingClients.get( index2 ).getClient().getStub() ) ) ;
 839                                                         } catch( RemoteException e ) {
 840                                                                 System.err.println( "Unable to create the save neighbor!" ) ;
 841                                                                 e.printStackTrace() ;
 842                                                         }
 843                                                 }
 844                                         }
 845                                 }
 846                         }
 847
 848                         applications.add( app ) ;
 849
 850                         ind = applications.indexOf( app ) ;
 851
 852                         return ac ;
 853                 }
 854
 855                 return null ;
 856         }
 857
 858
 859         @Override
 860         public void requestSave( String _ip )
 861         {
 862                 try {
 863                         semaSave.acquire() ;
 864                 } catch( InterruptedException e ) {
 865                         System.err.println( "Unable to obtain the semaphore for semaSave!" ) ;
 866                         e.printStackTrace() ;
 867                 }
 868
 869                 final String ip = _ip ;
 870
 871                 new Thread( new Runnable() {
 872
 873                         @Override
 874                         public void run()
 875                         {
 876                                 treatRequestSave( ip ) ;
 877                         }
 878                 } ).start() ;
 879         }
 880
 881
 882         public void treatRequestSave( String _ip )
 883         {
 884                 if( applications.size() > 0 && _ip != null && _ip.length() > 0 )
 885                 {
 886                         if( (System.currentTimeMillis() - applications.get( ind ).getLastSaveDate()) > save_interleave )
 887                         {
 888                                 // Mark it as a requester
 889                                 for( int i = 0 ; i < applications.get( ind ).getComputingClients().size() ; i++ )
 890                                 {
 891                                         if( applications.get( ind ).getComputingClients().get( i ).getClient().getIP().equalsIgnoreCase( _ip ) )
 892                                         {
 893                                                 applications.get( ind ).getComputingClients().get( i ).setSaveRequest( true ) ;
 894
 895                                                 break ;
 896                                         }
 897                                 }
 898
 899                                 semaSave.release() ;
 900
 901                                 // Is every body ok?
 902                                 boolean ok = false ;
 903                                 for( int i = 0 ; i < applications.get( ind ).getComputingClients().size() ; i++ )
 904                                 {
 905                                         if( i == 0 )
 906                                         {
 907                                                 ok = applications.get( ind ).getComputingClients().get( i ).getSaveRequest() ;
 908                                         } else {
 909                                                 ok = ok & applications.get( ind ).getComputingClients().get( i ).getSaveRequest() ;
 910                                         }
 911
 912                                         if( ! ok )
 913                                         {
 914                                                 break ;
 915                                         }
 916                                 }
 917
 918                                 if( ok )
 919                                 {
 920 //                                      try {
 921 //                                              Thread.sleep( 5000 ) ;
 922 //                                      } catch( InterruptedException e1 ) {
 923 //                                              e1.printStackTrace() ;
 924 //                                      }
 925
 926                                         for( int i = 0 ; i < applications.get( ind ).getComputingClients().size() ; i++ )
 927                                         {
 928                                                 try {
 929                                                         applications.get( ind ).getComputingClients().get( i ).getClient().getStub().responseSave( true ) ;
 930                                                         applications.get( ind ).getComputingClients().get( i ).setSaveRequest( false ) ;
 931                                                 } catch( RemoteException e ) {
 932                                                         System.err.println( "Unable to send the save request response to " +
 933                                                                         applications.get( ind ).getComputingClients().get( i ).getClient().getName() + "!" ) ;
 934                                                         e.printStackTrace() ;
 935                                                 }
 936                                         }
 937
 938                                         applications.get( ind ).setLastSaveDate( System.currentTimeMillis() ) ;
 939                                 }
 940
 941                         } else {
 942                                 semaSave.release() ;
 943
 944                                 for( int i = 0 ; i < applications.get( ind ).getComputingClients().size() ; i++ )
 945                                 {
 946                                         if( applications.get( ind ).getComputingClients().get( i ).getClient().getIP().equalsIgnoreCase( _ip ) )
 947                                         {
 948                                                 try {
 949                                                         applications.get( ind ).getComputingClients().get( i ).getClient().getStub().responseSave( false ) ;
 950                                                 } catch( RemoteException e ) {
 951                                                         System.err.println( "Unable to send the save request response to " +
 952                                                                         applications.get( ind ).getComputingClients().get( i ).getClient().getName() + "!" ) ;
 953                                                         e.printStackTrace() ;
 954                                                 }
 955                                                 break ;
 956                                         }
 957                                 }
 958                         }
 959                 } else {
 960                         semaSave.release() ;
 961                         System.err.println( "!! Serious problem in treatRequestSave method!!" ) ;
 962                 }
 963         }
 964
 965
 966         @Override
 967         public void restartOk( String _ip )
 968         {
 969                 if( applications.size() > 0 && _ip != null && _ip.length() > 0 )
 970                 {
 971                         System.out.println( "Client " + _ip + " has finished to restart ("+applications.get( ind ).getComputingClients().size()+") ... " ) ;
 972 //                      if( (System.currentTimeMillis() - applications.get( ind ).getLastSaveDate()) > save_interleave )
 973                         {
 974                                 // Has it already finished?
 975                                 for( int i = 0 ; i < applications.get( ind ).getComputingClients().size() ; i++ )
 976                                 {
 977                                         if( applications.get( ind ).getComputingClients().get( i ).getClient().getIP().equalsIgnoreCase( _ip ) )
 978                                         {
 979                                                 applications.get( ind ).getComputingClients().get( i ).setRestartOk( true ) ;
 980
 981                                                 break ;
 982                                         }
 983                                 }
 984
 985                                 // Is everybody ok?
 986                                 boolean ok = false ;
 987                                 for( int i = 0 ; i < applications.get( ind ).getComputingClients().size() ; i++ )
 988                                 {
 989                                         if( i == 0 )
 990                                         {
 991                                                 ok = applications.get( ind ).getComputingClients().get( i ).getRestartOk() ;
 992                                         } else {
 993                                                 ok = ok & applications.get( ind ).getComputingClients().get( i ).getRestartOk() ;
 994                                         }
 995
 996                                         if( ! ok )
 997                                         {
 998                                                 break ;
 999                                         }
1000                                 }
1001
1002                                 if( ok )
1003                                 {
1004                                         applications.get( ind ).setLastSaveDate( System.currentTimeMillis() ) ;
1005
1006                                         for( int i = 0 ; i < applications.get( ind ).getComputingClients().size() ; i++ )
1007                                         {
1008                                                 applications.get( ind ).getComputingClients().get( i ).setRestartOk( false ) ;
1009                                         }
1010                                 }
1011
1012                         }
1013                 }
1014         }
1015
1016
1017         @Override
1018         public void goApplication()
1019         {
1020                 synchronized( applications ) {
1021                 if( running && applications.get( ind ).getStartTime() != 0 )
1022                 {
1023                         applications.get( ind ).setStartTime( System.currentTimeMillis() ) ;
1024                         applications.get( ind ).setLastSaveDate( System.currentTimeMillis() ) ;
1025                 }}
1026         }
1027
1028
1029         @Override
1030         public void endApplication()
1031         {
1032                 synchronized( applications )
1033                 {
1034                 if( running )
1035                 {
1036                         Iterator<ComputingClient> it = computingClients.iterator() ;
1037
1038                         while( it.hasNext() )
1039                         {
1040                                 ComputingClient cl = it.next() ;
1041
1042                                 try {
1043                                         cl.getClient().getStub().emergencyStop() ;
1044                                 } catch (RemoteException e) {
1045                                         e.printStackTrace();
1046                                 }
1047
1048                                 cl.getClient().setStatus( "connected" ) ;
1049                                 cl.getClient().setComputingClient( null ) ;
1050                                 it.remove() ;
1051                                 cl = null ;
1052                         }
1053
1054                         applications.get( ind ).setEndTime( System.currentTimeMillis() ) ;
1055                         applications.get( ind ).setRunning( false ) ;
1056                         applications.get( ind ).clear() ;
1057 //                      applications.remove( ind ) ;
1058
1059                         running = false ;
1060
1061                         System.out.println( "Application " + applications.get( ind ).getName() + " ends in " +
1062                                         applications.get( ind ).getExecutionTime() + " seconds." ) ;
1063                 }}
1064         }
1065
1066
1067
1068         @Override
1069         public String getAssociatedIP( String _ip )
1070         {
1071                 String ret = null ;
1072
1073                 for( int i = 0 ; i < vmIPs.size() ; i++ )
1074                 {
1075                         if( vmIPs.get( i ).getHostIP().equalsIgnoreCase( _ip ) )
1076                         {
1077                                 ret = vmIPs.get( i ).getVmIP() ;
1078                                 break ;
1079                         }
1080                 }
1081
1082                 return ret ;
1083         }
1084
1085
1086         public Integer deployVM( final String _name, final String _archive, final String _directory )
1087         {
1088                 int nb = 0, pb = 0 ;
1089
1090                 if( _name != null && _name.length() > 0 && _archive != null && _name.length() > 0
1091                                 && _directory != null && _directory.length() > 0 )
1092                 {
1093                         System.out.println( "Deploying the VM " + _name + " (" + _archive + ") ... " ) ;
1094
1095                         File file = new File( working_directory + "/" + _archive ) ;
1096                         if( ! file.exists() )
1097                         {
1098                                 System.err.println( "There is no archive named " + _archive + " in my working directory!" ) ;
1099                                 file = null ;
1100                                 return 1 ;
1101                         } else if( file.isDirectory() ) {
1102                                 System.err.println( _archive + " is a directory!" ) ;
1103                                 file = null ;
1104                                 return 1 ;
1105                         }
1106
1107                         file = null ;
1108
1109                         // TODO do a better deployment !!
1110 //                      int ret ;
1111 //                      boolean error, ok, server ;
1112 //                      ArrayList<ConnectedClient> deployed = new ArrayList<ConnectedClient>() ;
1113
1114 //                      boolean server = true ;
1115 //                      boolean ok ;
1116
1117                         for( int i = 0 ; i < clients.size() ; i++ )
1118                         {
1119 //                              ret = 1 ;
1120                                 nb++ ;
1121 //                              error = false ;
1122 //                              ok = false ;
1123                                 if( clients.get( i ).getStatus().equalsIgnoreCase( "connected" ) )
1124                                 {
1125                                         synchronized( limitThread )
1126                                         {
1127                                                 while( limitThread.getNb() >= maxThread )
1128                                                 {
1129                                                         try {
1130                                                                 limitThread.wait() ;
1131                                                         } catch (InterruptedException e) {
1132                                                                 e.printStackTrace();
1133                                                         }
1134                                                 }
1135
1136                                                 limitThread.inc() ;
1137                                         }
1138
1139                                         final int indice = i ;
1140                                         new Thread( new Runnable() {
1141
1142                                                 @Override
1143                                                 public void run() {
1144                                                         int ret = -1 ;
1145                                                         boolean error = true  ;
1146
1147                                                         try {
1148                                                                 ret = clients.get( indice ).getStub().deployVM( _name, _archive, _directory ) ;
1149                                                         } catch( RemoteException e ) {
1150                                                                 System.err.println( "Unable to deploy the VM on " + clients.get( indice ).getName() + "!" ) ;
1151                                                                 e.printStackTrace() ;
1152                                                         }
1153
1154                                                         // The client does not have the archive, we have to send it.
1155                                                         if( ret == 2 )
1156                                                         {
1157                                                                 // Attention au multi-envois !!!
1158                                                                 System.out.print( "Sending VM archive to " + clients.get( indice ).getName() + " ... " ) ;
1159
1160                                                                 String wd = "" ;
1161                                                                 String snIP = "" ;
1162                                                                 error = false ;
1163
1164                                                                 try {
1165                                                                         wd = clients.get( indice ).getStub().getWorkingDirectory() ;
1166                                                                         snIP = clients.get( indice ).getStub().getIPHost() ;
1167                                                                 } catch (RemoteException e2) {
1168                                                                         System.err.println( "Unable to retrieve information on " + clients.get( indice ).getName() + "!" ) ;
1169                                                                         e2.printStackTrace() ;
1170                                                                         error = true ;
1171                                                                 }
1172
1173                                                                 String[] command = new String[]{ "/usr/bin/scp", working_directory + "/" + _archive,
1174                                                                                 snIP + ":" + wd } ;
1175
1176                                                                 if( ! error )
1177                                                                 {
1178                                                                         try {
1179                                                                                 Process proc = Runtime.getRuntime().exec( command ) ;
1180                                                                                 proc.waitFor() ;
1181
1182                                                                                 if( proc.exitValue() == 0 )
1183                                                                                 {
1184                                                                                         System.out.println( "Initial VM archive successfully sent." ) ;
1185                                                                                 } else {
1186                                                                                         System.err.println( "Initial VM archive not sent!" ) ;
1187                                                                                         System.err.println( "Error: " + proc.exitValue() ) ;
1188                                                                                         BufferedReader b = new BufferedReader( new InputStreamReader( proc.getErrorStream() ) ) ;
1189
1190                                                                                         String l ;
1191                                                                                         try {
1192                                                                                                 while( (l = b.readLine()) != null )
1193                                                                                                 {
1194                                                                                                         System.err.println( l ) ;
1195                                                                                                 }
1196                                                                                         } catch( IOException e ) {
1197                                                                                                 e.printStackTrace() ;
1198                                                                                         }
1199
1200                                                                                         error = true ;
1201                                                                                 }
1202                                                                         } catch( IOException e ) {
1203                                                                                 System.err.println( "Error during initial VM archive send command: " ) ;
1204                                                                                 e.printStackTrace() ;
1205                                                                                 error = true ;
1206                                                                         } catch( InterruptedException e ) {
1207                                                                                 e.printStackTrace() ;
1208                                                                                 error = true ;
1209                                                                         }
1210                                                                 }
1211
1212
1213                                                                 if( ! error )
1214                                                                 {
1215                                                                         // Second try ...
1216                                                                         ret = 1 ;
1217                                                                         try {
1218                                                                                 ret = clients.get( indice ).getStub().deployVM( _name, _archive, _directory ) ;
1219                                                                         } catch( RemoteException e ) {
1220                                                                                 System.err.println( "Unable to deploy the VM on " + clients.get( indice ).getName() + "!" ) ;
1221                                                                                 e.printStackTrace() ;
1222                                                                         }
1223                                                                 }
1224                                                         }
1225
1226                                                         if( ret == 0 )
1227                                                         {
1228                                                                 System.out.println( "Initial VM archive successfully deployed on " + clients.get( indice ).getName() + "." ) ;
1229
1230                                                                 synchronized( deployingClients )
1231                                                                 {
1232                                                                         deployingClients.inc() ;
1233                                                                 }
1234                                                         }
1235
1236                                                         synchronized( limitThread )
1237                                                         {
1238                                                                 limitThread.dec() ;
1239                                                                 limitThread.notifyAll() ;
1240                                                         }
1241                                                 }
1242                                         }).start() ;
1243                                 }
1244                         }
1245                 }
1246
1247                 synchronized( limitThread )
1248                 {
1249                         while( limitThread.getNb() > 0  )
1250                         {
1251                                 try {
1252                                         limitThread.wait() ;
1253                                 } catch( InterruptedException e ) {
1254                                         e.printStackTrace() ;
1255                                 }
1256                         }
1257                 }
1258
1259                 if( nb - deployingClients.getNb() > 0 )
1260                 {
1261                         if( pb == 1 )
1262                                 System.err.println( "** " + pb + " machine is not deployed!" ) ;
1263                         if( pb > 1 )
1264                                 System.err.println( "** " + pb + " machines are not deployed!" ) ;
1265                 }
1266
1267                 return nb ;
1268         }
1269
1270
1271         public String getWorkingDirectory()
1272         {
1273                 return working_directory ;
1274         }
1275
1276
1277         private class OperatingClients
1278         {
1279                 private int nb ;
1280
1281                 OperatingClients() { nb = 0 ; }
1282
1283                 protected void inc() { nb++ ; }
1284
1285                 protected void dec() { nb-- ; }
1286
1287                 protected int getNb() { return nb ; }
1288         }
1289
1290
1291         private class LimitThread
1292         {
1293                 private int nb ;
1294
1295                 LimitThread() { nb = 0 ; }
1296
1297                 protected void inc() { nb++ ; }
1298
1299                 protected void dec() { nb-- ; }
1300
1301                 protected int getNb() { return nb ; }
1302         }
1303
1304 }
1305
1306 /** La programmation est un art, respectons ceux qui la pratiquent !! **/
1307