opendaylight/clustering/services_implementation/src/main/java/org/opendaylight/controller/clustering/services_implementation/internal/ClusterManager.java

   1
   2 /*
   3  * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
   4  *
   5  * This program and the accompanying materials are made available under the
   6  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   7  * and is available at http://www.eclipse.org/legal/epl-v10.html
   8  */
   9
  10 package org.opendaylight.controller.clustering.services_implementation.internal;
  11
  12 import java.io.PrintWriter;
  13 import java.io.StringWriter;
  14 import java.net.InetAddress;
  15 import java.net.NetworkInterface;
  16 import java.net.SocketException;
  17 import java.net.UnknownHostException;
  18 import java.util.ArrayList;
  19 import java.util.EnumSet;
  20 import java.util.Enumeration;
  21 import java.util.HashSet;
  22 import java.util.List;
  23 import java.util.Properties;
  24 import java.util.Set;
  25 import java.util.StringTokenizer;
  26 import java.util.concurrent.ConcurrentMap;
  27
  28 import javax.transaction.HeuristicMixedException;
  29 import javax.transaction.HeuristicRollbackException;
  30 import javax.transaction.NotSupportedException;
  31 import javax.transaction.RollbackException;
  32 import javax.transaction.SystemException;
  33 import javax.transaction.Transaction;
  34 import javax.transaction.TransactionManager;
  35
  36 import org.infinispan.Cache;
  37 import org.infinispan.configuration.cache.Configuration;
  38 import org.infinispan.manager.DefaultCacheManager;
  39 import org.infinispan.manager.EmbeddedCacheManager;
  40 import org.infinispan.notifications.Listener;
  41 import org.infinispan.notifications.cachemanagerlistener.annotation.ViewChanged;
  42 import org.infinispan.notifications.cachemanagerlistener.event.ViewChangedEvent;
  43 import org.infinispan.remoting.transport.Address;
  44 import org.infinispan.remoting.transport.Transport;
  45 import org.infinispan.remoting.transport.jgroups.JGroupsAddress;
  46 import org.infinispan.remoting.transport.jgroups.JGroupsTransport;
  47 import org.jgroups.Channel;
  48 import org.jgroups.Event;
  49 import org.jgroups.stack.GossipRouter;
  50 import org.opendaylight.controller.clustering.services.CacheConfigException;
  51 import org.opendaylight.controller.clustering.services.CacheExistException;
  52 import org.opendaylight.controller.clustering.services.CacheListenerAddException;
  53 import org.opendaylight.controller.clustering.services.IClusterServices;
  54 import org.opendaylight.controller.clustering.services.IGetUpdates;
  55 import org.opendaylight.controller.clustering.services.IListenRoleChange;
  56 import org.opendaylight.controller.clustering.services.ListenRoleChangeAddException;
  57 import org.slf4j.Logger;
  58 import org.slf4j.LoggerFactory;
  59
  60 public class ClusterManager implements IClusterServices {
  61     protected static final Logger logger = LoggerFactory
  62             .getLogger(ClusterManager.class);
  63     private DefaultCacheManager cm;
  64     GossipRouter gossiper;
  65     private HashSet<IListenRoleChange> roleChangeListeners;
  66     private ViewChangedListener cacheManagerListener;
  67
  68     private static String loopbackAddress = "127.0.0.1";
  69
  70     /**
  71      * Start a JGroups GossipRouter if we are a supernode. The
  72      * GosispRouter is nothing more than a simple
  73      * rendevouz-pointer. All the nodes that wants to join the cluster
  74      * will come to any of the rendevouz point and they introduce the
  75      * nodes to all the others. Once the meet and greet phase if over,
  76      * the nodes will open a full-mesh with the remaining n-1 nodes,
  77      * so even if the GossipRouter goes down nothing is lost.
  78      * NOTE: This function has the side effect to set some of the
  79      * JGROUPS configurations, this because in this function already
  80      * we try to retrieve some of the network capabilities of the
  81      * device and so it's better not to do that again
  82      *
  83      *
  84      * @return GossipRouter
  85      */
  86     private GossipRouter startGossiper() {
  87         boolean amIGossipRouter = false;
  88         Integer gossipRouterPortDefault = 12001;
  89         Integer gossipRouterPort = gossipRouterPortDefault;
  90         InetAddress gossipRouterAddress = null;
  91         String supernodes_list = System.getProperty("supernodes",
  92                 loopbackAddress);
  93         StringBuffer sanitized_supernodes_list = new StringBuffer();
  94         List<InetAddress> myAddresses = new ArrayList<InetAddress>();
  95
  96         StringTokenizer supernodes = new StringTokenizer(supernodes_list, ":");
  97         if (supernodes.hasMoreTokens()) {
  98             // Populate the list of my addresses
  99             try {
 100                 Enumeration<NetworkInterface> e = NetworkInterface.getNetworkInterfaces();
 101                 while (e.hasMoreElements()) {
 102                     NetworkInterface n = (NetworkInterface) e.nextElement();
 103                     Enumeration<InetAddress> ee = n.getInetAddresses();
 104                     while (ee.hasMoreElements()) {
 105                         InetAddress i = (InetAddress) ee.nextElement();
 106                         myAddresses.add(i);
 107                     }
 108                 }
 109             } catch (SocketException se) {
 110                 logger.error("Cannot get the list of network interfaces");
 111                 return null;
 112             }
 113         }
 114         while (supernodes.hasMoreTokens()) {
 115             String curr_supernode = supernodes.nextToken();
 116             logger.debug("Examining supernode " + curr_supernode);
 117             StringTokenizer host_port = new StringTokenizer(curr_supernode,
 118                     "[]");
 119             String host;
 120             String port;
 121             Integer port_num = gossipRouterPortDefault;
 122             if (host_port.countTokens() > 2) {
 123                 logger.error("Error parsing supernode " + curr_supernode
 124                         + " proceed to the next one");
 125                 continue;
 126             }
 127             host = host_port.nextToken();
 128             InetAddress hostAddr;
 129             try {
 130                 hostAddr = InetAddress.getByName(host);
 131             } catch (UnknownHostException ue) {
 132                 logger.error("Host not known");
 133                 continue;
 134             }
 135             if (host_port.hasMoreTokens()) {
 136                 port = host_port.nextToken();
 137                 try {
 138                     port_num = Integer.valueOf(port);
 139                 } catch (NumberFormatException ne) {
 140                     logger
 141                             .error("Supplied supernode gossiepr port is not recognized, using standard gossipport");
 142                     port_num = gossipRouterPortDefault;
 143                 }
 144                 if ((port_num > 65535) || (port_num < 0)) {
 145                     logger
 146                             .error("Supplied supernode gossip port is outside a valid TCP port range");
 147                     port_num = gossipRouterPortDefault;
 148                 }
 149             }
 150             if (!amIGossipRouter) {
 151                 if (host != null) {
 152                     for (InetAddress myAddr : myAddresses) {
 153                         if (myAddr.equals(hostAddr)) {
 154                             amIGossipRouter = true;
 155                             gossipRouterAddress = hostAddr;
 156                             gossipRouterPort = port_num;
 157                             break;
 158                         }
 159                     }
 160                 }
 161             }
 162             if (!sanitized_supernodes_list.toString().equals("")) {
 163                 sanitized_supernodes_list.append(",");
 164             }
 165             sanitized_supernodes_list.append(hostAddr.getHostAddress() + "["
 166                     + port_num + "]");
 167         }
 168
 169         if (amIGossipRouter) {
 170             // Set the Jgroups binding interface to the one we got
 171             // from the supernodes attribute
 172             if (gossipRouterAddress != null) {
 173                 System.setProperty("jgroups.tcp.address", gossipRouterAddress
 174                         .getHostAddress());
 175             }
 176         } else {
 177             // Set the Jgroup binding interface to the one we are well
 178             // known outside or else to the first with non-local
 179             // scope.
 180             try {
 181                 String myBind = InetAddress.getLocalHost().getHostAddress();
 182                 if (myBind == null
 183                         || InetAddress.getLocalHost().isLoopbackAddress()) {
 184                     for (InetAddress myAddr : myAddresses) {
 185                         if (myAddr.isLoopbackAddress()
 186                                 || myAddr.isLinkLocalAddress()) {
 187                             logger.debug("Skipping local address "
 188                                     + myAddr.getHostAddress());
 189                             continue;
 190                         } else {
 191                             // First non-local address
 192                             myBind = myAddr.getHostAddress();
 193                             logger.debug("First non-local address " + myBind);
 194                             break;
 195                         }
 196                     }
 197                 }
 198                 String jgroupAddress = System
 199                         .getProperty("jgroups.tcp.address");
 200                 if (jgroupAddress == null) {
 201                     if (myBind != null) {
 202                         logger.debug("Set bind address to be " + myBind);
 203                         System.setProperty("jgroups.tcp.address", myBind);
 204                     } else {
 205                         logger
 206                                 .debug("Set bind address to be LOCALHOST=127.0.0.1");
 207                         System.setProperty("jgroups.tcp.address", "127.0.0.1");
 208                     }
 209                 } else {
 210                     logger.debug("jgroup.tcp.address already set to be "
 211                             + jgroupAddress);
 212                 }
 213             } catch (UnknownHostException uhe) {
 214                 logger
 215                         .error("Met UnknownHostException while trying to get binding address for jgroups");
 216             }
 217         }
 218
 219         // The supernodes list constitute also the tcpgossip initial
 220         // host list
 221         System.setProperty("jgroups.tcpgossip.initial_hosts",
 222                 sanitized_supernodes_list.toString());
 223         logger.debug("jgroups.tcp.address set to "
 224                 + System.getProperty("jgroups.tcp.address"));
 225         logger.debug("jgroups.tcpgossip.initial_hosts set to "
 226                 + System.getProperty("jgroups.tcpgossip.initial_hosts"));
 227         GossipRouter res = null;
 228         if (amIGossipRouter) {
 229             logger.info("I'm a GossipRouter will listen on port "
 230                     + gossipRouterPort);
 231             res = new GossipRouter(gossipRouterPort);
 232         }
 233         return res;
 234     }
 235
 236     public void start() {
 237         this.gossiper = startGossiper();
 238         if (this.gossiper != null) {
 239             logger.debug("Trying to start Gossiper");
 240             try {
 241                 this.gossiper.start();
 242                 logger.info("Started GossipRouter");
 243             } catch (Exception e) {
 244                 logger.error("GossipRouter didn't start exception " + e
 245                         + " met");
 246                 logger.error("Stack Trace that raised the exception");
 247                 logger.error("",e);
 248             }
 249         }
 250         logger.info("Starting the ClusterManager");
 251         try {
 252             //FIXME keeps throwing FileNotFoundException
 253             this.cm = new DefaultCacheManager("/config/infinispan-config.xml");
 254             logger.debug("Allocated ClusterManager");
 255             if (this.cm != null) {
 256                 this.cm.start();
 257                 this.cm.startCache();
 258                 logger.debug("Started the ClusterManager");
 259             }
 260         } catch (Exception ioe) {
 261             logger.error("Cannot configure infinispan .. bailing out ");
 262             logger.error("Stack Trace that raised th exception");
 263             logger.error("",ioe);
 264             this.cm = null;
 265             this.stop();
 266         }
 267         logger.debug("Cache Manager has value " + this.cm);
 268     }
 269
 270     public void stop() {
 271         logger.info("Stopping the ClusterManager");
 272         if (this.cm != null) {
 273             logger.info("Found a valid ClusterManager, now let it be stopped");
 274             this.cm.stop();
 275             this.cm = null;
 276         }
 277         if (this.gossiper != null) {
 278             this.gossiper.stop();
 279             this.gossiper = null;
 280         }
 281     }
 282
 283     @Override
 284     public ConcurrentMap<?, ?> createCache(String containerName,
 285             String cacheName, Set<cacheMode> cMode) throws CacheExistException,
 286             CacheConfigException {
 287         EmbeddedCacheManager manager = this.cm;
 288         Cache<Object,Object> c;
 289         String realCacheName = "{" + containerName + "}_{" + cacheName + "}";
 290         if (manager == null) {
 291             return null;
 292         }
 293
 294         if (manager.cacheExists(realCacheName)) {
 295             throw new CacheExistException();
 296         }
 297
 298         // Sanity check to avoid contrasting parameters
 299         if (cMode.containsAll(EnumSet.of(
 300                 IClusterServices.cacheMode.NON_TRANSACTIONAL,
 301                 IClusterServices.cacheMode.TRANSACTIONAL))) {
 302             throw new CacheConfigException();
 303         }
 304
 305         if (cMode.contains(IClusterServices.cacheMode.NON_TRANSACTIONAL)) {
 306             c = manager.getCache(realCacheName);
 307             return c;
 308         } else if (cMode.contains(IClusterServices.cacheMode.TRANSACTIONAL)) {
 309             Configuration rc = manager
 310                     .getCacheConfiguration("transactional-type");
 311             manager.defineConfiguration(realCacheName, rc);
 312             c = manager.getCache(realCacheName);
 313             return c;
 314         }
 315         return null;
 316     }
 317
 318     @Override
 319     public ConcurrentMap<?, ?> getCache(String containerName, String cacheName) {
 320         EmbeddedCacheManager manager = this.cm;
 321         Cache<Object,Object> c;
 322         String realCacheName = "{" + containerName + "}_{" + cacheName + "}";
 323         if (manager == null) {
 324             return null;
 325         }
 326
 327         if (manager.cacheExists(realCacheName)) {
 328             c = manager.getCache(realCacheName);
 329             return c;
 330         }
 331         return null;
 332     }
 333
 334     @Override
 335     public void destroyCache(String containerName, String cacheName) {
 336         EmbeddedCacheManager manager = this.cm;
 337         String realCacheName = "{" + containerName + "}_{" + cacheName + "}";
 338         if (manager == null) {
 339             return;
 340         }
 341         if (manager.cacheExists(realCacheName)) {
 342             manager.removeCache(realCacheName);
 343         }
 344     }
 345
 346     @Override
 347     public boolean existCache(String containerName, String cacheName) {
 348         EmbeddedCacheManager manager = this.cm;
 349         String realCacheName = "{" + containerName + "}_{" + cacheName + "}";
 350         if (manager == null) {
 351             return false;
 352         }
 353         return manager.cacheExists(realCacheName);
 354     }
 355
 356     @Override
 357     public Set<String> getCacheList(String containerName) {
 358         Set<String> perContainerCaches = new HashSet<String>();
 359         EmbeddedCacheManager manager = this.cm;
 360         if (manager == null) {
 361             return null;
 362         }
 363         for (String cacheName : manager.getCacheNames()) {
 364             if (cacheName.startsWith("{" + containerName + "}_")) {
 365                 String[] res = cacheName.split("[{}]");
 366                 if (res.length >= 4 && res[1].equals(containerName)
 367                         && res[2].equals("_")) {
 368                     perContainerCaches.add(res[3]);
 369                 }
 370             }
 371         }
 372
 373         return (perContainerCaches);
 374     }
 375
 376     @Override
 377     public Properties getCacheProperties(String containerName, String cacheName) {
 378         EmbeddedCacheManager manager = this.cm;
 379         if (manager == null) {
 380             return null;
 381         }
 382         String realCacheName = "{" + containerName + "}_{" + cacheName + "}";
 383         if (!manager.cacheExists(realCacheName)) {
 384             return null;
 385         }
 386         Configuration conf = manager.getCache(realCacheName).getAdvancedCache()
 387                 .getCacheConfiguration();
 388         Properties p = new Properties();
 389         p.setProperty(IClusterServices.cacheProps.TRANSACTION_PROP.toString(),
 390                 conf.transaction().toString());
 391         p.setProperty(IClusterServices.cacheProps.CLUSTERING_PROP.toString(),
 392                 conf.clustering().toString());
 393         p.setProperty(IClusterServices.cacheProps.LOCKING_PROP.toString(), conf
 394                 .locking().toString());
 395         return p;
 396     }
 397
 398     @Override
 399     public void addListener(String containerName, String cacheName,
 400             IGetUpdates<?, ?> u) throws CacheListenerAddException {
 401         EmbeddedCacheManager manager = this.cm;
 402         Cache<Object,Object> c;
 403         String realCacheName = "{" + containerName + "}_{" + cacheName + "}";
 404         if (manager == null) {
 405             return;
 406         }
 407
 408         if (!manager.cacheExists(realCacheName)) {
 409             throw new CacheListenerAddException();
 410         }
 411         c = manager.getCache(realCacheName);
 412         CacheListenerContainer cl = new CacheListenerContainer(u,
 413                 containerName, cacheName);
 414         c.addListener(cl);
 415     }
 416
 417     @Override
 418     public Set<IGetUpdates<?, ?>> getListeners(String containerName,
 419             String cacheName) {
 420         EmbeddedCacheManager manager = this.cm;
 421         Cache<Object,Object> c;
 422         String realCacheName = "{" + containerName + "}_{" + cacheName + "}";
 423         if (manager == null) {
 424             return null;
 425         }
 426
 427         if (!manager.cacheExists(realCacheName)) {
 428             return null;
 429         }
 430         c = manager.getCache(realCacheName);
 431
 432         Set<IGetUpdates<?, ?>> res = new HashSet<IGetUpdates<?, ?>>();
 433         Set<Object> listeners = c.getListeners();
 434         for (Object listener : listeners) {
 435             if (listener instanceof CacheListenerContainer) {
 436                 CacheListenerContainer cl = (CacheListenerContainer) listener;
 437                 res.add(cl.whichListener());
 438             }
 439         }
 440
 441         return res;
 442     }
 443
 444     @Override
 445     public void removeListener(String containerName, String cacheName,
 446             IGetUpdates<?, ?> u) {
 447         EmbeddedCacheManager manager = this.cm;
 448         Cache<Object,Object> c;
 449         String realCacheName = "{" + containerName + "}_{" + cacheName + "}";
 450         if (manager == null) {
 451             return;
 452         }
 453
 454         if (!manager.cacheExists(realCacheName)) {
 455             return;
 456         }
 457         c = manager.getCache(realCacheName);
 458
 459         Set<Object> listeners = c.getListeners();
 460         for (Object listener : listeners) {
 461             if (listener instanceof CacheListenerContainer) {
 462                 CacheListenerContainer cl = (CacheListenerContainer) listener;
 463                 if (cl.whichListener() == u) {
 464                     c.removeListener(listener);
 465                     return;
 466                 }
 467             }
 468         }
 469     }
 470
 471     @Override
 472     public void tbegin() throws NotSupportedException, SystemException {
 473         EmbeddedCacheManager manager = this.cm;
 474         if (manager == null) {
 475             throw new IllegalStateException();
 476         }
 477         TransactionManager tm = manager.getCache("transactional-type")
 478                 .getAdvancedCache().getTransactionManager();
 479         if (tm == null) {
 480             throw new IllegalStateException();
 481         }
 482         tm.begin();
 483     }
 484
 485     @Override
 486     public void tcommit() throws RollbackException, HeuristicMixedException,
 487             HeuristicRollbackException, java.lang.SecurityException,
 488             java.lang.IllegalStateException, SystemException {
 489         EmbeddedCacheManager manager = this.cm;
 490         if (manager == null) {
 491             throw new IllegalStateException();
 492         }
 493         TransactionManager tm = manager.getCache("transactional-type")
 494                 .getAdvancedCache().getTransactionManager();
 495         if (tm == null) {
 496             throw new IllegalStateException();
 497         }
 498         tm.commit();
 499     }
 500
 501     @Override
 502     public void trollback() throws java.lang.IllegalStateException,
 503             java.lang.SecurityException, SystemException {
 504         EmbeddedCacheManager manager = this.cm;
 505         if (manager == null) {
 506             throw new IllegalStateException();
 507         }
 508         TransactionManager tm = manager.getCache("transactional-type")
 509                 .getAdvancedCache().getTransactionManager();
 510         if (tm == null) {
 511             throw new IllegalStateException();
 512         }
 513         tm.rollback();
 514     }
 515
 516     @Override
 517     public Transaction tgetTransaction() throws SystemException {
 518         EmbeddedCacheManager manager = this.cm;
 519         if (manager == null) {
 520             throw new IllegalStateException();
 521         }
 522         TransactionManager tm = manager.getCache("transactional-type")
 523                 .getAdvancedCache().getTransactionManager();
 524         if (tm == null) {
 525             return null;
 526         }
 527         return tm.getTransaction();
 528     }
 529
 530     @Override
 531     public boolean amIStandby() {
 532         EmbeddedCacheManager manager = this.cm;
 533         if (manager == null) {
 534             // In case we cannot fetch the information, lets assume we
 535             // are standby, so to have less responsibility.
 536             return true;
 537         }
 538         return (!manager.isCoordinator());
 539     }
 540
 541     private InetAddress addressToInetAddress(Address a) {
 542         EmbeddedCacheManager manager = this.cm;
 543         if ((manager == null) || (a == null)) {
 544             // In case we cannot fetch the information, lets assume we
 545             // are standby, so to have less responsibility.
 546             return null;
 547         }
 548         Transport t = manager.getTransport();
 549         if (t instanceof JGroupsTransport) {
 550             JGroupsTransport jt = (JGroupsTransport) t;
 551             Channel c = jt.getChannel();
 552             if (a instanceof JGroupsAddress) {
 553                 JGroupsAddress ja = (JGroupsAddress) a;
 554                 org.jgroups.Address phys = (org.jgroups.Address) c
 555                         .down(new Event(Event.GET_PHYSICAL_ADDRESS, ja
 556                                 .getJGroupsAddress()));
 557                 if (phys instanceof org.jgroups.stack.IpAddress) {
 558                     InetAddress bindAddress = ((org.jgroups.stack.IpAddress) phys)
 559                             .getIpAddress();
 560                     return bindAddress;
 561                 }
 562             }
 563         }
 564         return null;
 565     }
 566
 567     public List<InetAddress> getClusteredControllers() {
 568         EmbeddedCacheManager manager = this.cm;
 569         if (manager == null) {
 570             return null;
 571         }
 572         List<Address> controllers = manager.getMembers();
 573         if ((controllers == null) || controllers.size() == 0)
 574             return null;
 575
 576         List<InetAddress> clusteredControllers = new ArrayList<InetAddress>();
 577         for (Address a : controllers) {
 578             InetAddress inetAddress = addressToInetAddress(a);
 579             if (inetAddress != null
 580                     && !inetAddress.getHostAddress().equals(loopbackAddress))
 581                 clusteredControllers.add(inetAddress);
 582         }
 583         return clusteredControllers;
 584     }
 585
 586     public InetAddress getMyAddress() {
 587         EmbeddedCacheManager manager = this.cm;
 588         if (manager == null) {
 589             return null;
 590         }
 591         return addressToInetAddress(manager.getAddress());
 592     }
 593
 594     @Override
 595     public InetAddress getActiveAddress() {
 596         EmbeddedCacheManager manager = this.cm;
 597         if (manager == null) {
 598             // In case we cannot fetch the information, lets assume we
 599             // are standby, so to have less responsibility.
 600             return null;
 601         }
 602
 603         return addressToInetAddress(manager.getCoordinator());
 604     }
 605
 606     @Override
 607     public void listenRoleChange(IListenRoleChange i)
 608             throws ListenRoleChangeAddException {
 609         EmbeddedCacheManager manager = this.cm;
 610         if (manager == null) {
 611             // In case we cannot fetch the information, lets assume we
 612             // are standby, so to have less responsibility.
 613             throw new ListenRoleChangeAddException();
 614         }
 615
 616         if (this.roleChangeListeners == null) {
 617             this.roleChangeListeners = new HashSet<IListenRoleChange>();
 618             this.cacheManagerListener = new ViewChangedListener(
 619                     this.roleChangeListeners);
 620             manager.addListener(this.cacheManagerListener);
 621         }
 622
 623         if (this.roleChangeListeners != null) {
 624             this.roleChangeListeners.add(i);
 625         }
 626     }
 627
 628     @Override
 629     public void unlistenRoleChange(IListenRoleChange i) {
 630         EmbeddedCacheManager manager = this.cm;
 631         if (manager == null) {
 632             // In case we cannot fetch the information, lets assume we
 633             // are standby, so to have less responsibility.
 634             return;
 635         }
 636
 637         if (this.roleChangeListeners != null) {
 638             this.roleChangeListeners.remove(i);
 639         }
 640
 641         if ((this.roleChangeListeners != null && this.roleChangeListeners
 642                 .isEmpty())
 643                 && (this.cacheManagerListener != null)) {
 644             manager.removeListener(this.cacheManagerListener);
 645             this.cacheManagerListener = null;
 646             this.roleChangeListeners = null;
 647         }
 648     }
 649
 650     @Listener
 651     public class ViewChangedListener {
 652         Set<IListenRoleChange> roleListeners;
 653
 654         public ViewChangedListener(Set<IListenRoleChange> s) {
 655             this.roleListeners = s;
 656         }
 657
 658         @ViewChanged
 659         public void viewChanged(ViewChangedEvent e) {
 660             for (IListenRoleChange i : this.roleListeners) {
 661                 i.newActiveAvailable();
 662             }
 663         }
 664     }
 665 }