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 {} proceed to the next one",
 124                         curr_supernode);
 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 Stack Trace",
 245                              e);
 246             }
 247         }
 248         logger.info("Starting the ClusterManager");
 249         try {
 250             //FIXME keeps throwing FileNotFoundException
 251             this.cm = new DefaultCacheManager("config/infinispan-config.xml");
 252             logger.debug("Allocated ClusterManager");
 253             if (this.cm != null) {
 254                 this.cm.start();
 255                 this.cm.startCache();
 256                 logger.debug("Started the ClusterManager");
 257             }
 258         } catch (Exception ioe) {
 259             logger.error("Cannot configure infinispan .. bailing out ");
 260             logger.error("Stack Trace that raised th exception");
 261             logger.error("",ioe);
 262             this.cm = null;
 263             this.stop();
 264         }
 265         logger.debug("Cache Manager has value {}", this.cm);
 266     }
 267
 268     public void stop() {
 269         logger.info("Stopping the ClusterManager");
 270         if (this.cm != null) {
 271             logger.info("Found a valid ClusterManager, now let it be stopped");
 272             this.cm.stop();
 273             this.cm = null;
 274         }
 275         if (this.gossiper != null) {
 276             this.gossiper.stop();
 277             this.gossiper = null;
 278         }
 279     }
 280
 281     @Override
 282     public ConcurrentMap<?, ?> createCache(String containerName,
 283             String cacheName, Set<cacheMode> cMode) throws CacheExistException,
 284             CacheConfigException {
 285         EmbeddedCacheManager manager = this.cm;
 286         Cache<Object,Object> c;
 287         String realCacheName = "{" + containerName + "}_{" + cacheName + "}";
 288         if (manager == null) {
 289             return null;
 290         }
 291
 292         if (manager.cacheExists(realCacheName)) {
 293             throw new CacheExistException();
 294         }
 295
 296         // Sanity check to avoid contrasting parameters
 297         if (cMode.containsAll(EnumSet.of(
 298                 IClusterServices.cacheMode.NON_TRANSACTIONAL,
 299                 IClusterServices.cacheMode.TRANSACTIONAL))) {
 300             throw new CacheConfigException();
 301         }
 302
 303         if (cMode.contains(IClusterServices.cacheMode.NON_TRANSACTIONAL)) {
 304             c = manager.getCache(realCacheName);
 305             return c;
 306         } else if (cMode.contains(IClusterServices.cacheMode.TRANSACTIONAL)) {
 307             Configuration rc = manager
 308                     .getCacheConfiguration("transactional-type");
 309             manager.defineConfiguration(realCacheName, rc);
 310             c = manager.getCache(realCacheName);
 311             return c;
 312         }
 313         return null;
 314     }
 315
 316     @Override
 317     public ConcurrentMap<?, ?> getCache(String containerName, String cacheName) {
 318         EmbeddedCacheManager manager = this.cm;
 319         Cache<Object,Object> c;
 320         String realCacheName = "{" + containerName + "}_{" + cacheName + "}";
 321         if (manager == null) {
 322             return null;
 323         }
 324
 325         if (manager.cacheExists(realCacheName)) {
 326             c = manager.getCache(realCacheName);
 327             return c;
 328         }
 329         return null;
 330     }
 331
 332     @Override
 333     public void destroyCache(String containerName, String cacheName) {
 334         EmbeddedCacheManager manager = this.cm;
 335         String realCacheName = "{" + containerName + "}_{" + cacheName + "}";
 336         if (manager == null) {
 337             return;
 338         }
 339         if (manager.cacheExists(realCacheName)) {
 340             manager.removeCache(realCacheName);
 341         }
 342     }
 343
 344     @Override
 345     public boolean existCache(String containerName, String cacheName) {
 346         EmbeddedCacheManager manager = this.cm;
 347         String realCacheName = "{" + containerName + "}_{" + cacheName + "}";
 348         if (manager == null) {
 349             return false;
 350         }
 351         return manager.cacheExists(realCacheName);
 352     }
 353
 354     @Override
 355     public Set<String> getCacheList(String containerName) {
 356         Set<String> perContainerCaches = new HashSet<String>();
 357         EmbeddedCacheManager manager = this.cm;
 358         if (manager == null) {
 359             return null;
 360         }
 361         for (String cacheName : manager.getCacheNames()) {
 362             if (cacheName.startsWith("{" + containerName + "}_")) {
 363                 String[] res = cacheName.split("[{}]");
 364                 if (res.length >= 4 && res[1].equals(containerName)
 365                         && res[2].equals("_")) {
 366                     perContainerCaches.add(res[3]);
 367                 }
 368             }
 369         }
 370
 371         return (perContainerCaches);
 372     }
 373
 374     @Override
 375     public Properties getCacheProperties(String containerName, String cacheName) {
 376         EmbeddedCacheManager manager = this.cm;
 377         if (manager == null) {
 378             return null;
 379         }
 380         String realCacheName = "{" + containerName + "}_{" + cacheName + "}";
 381         if (!manager.cacheExists(realCacheName)) {
 382             return null;
 383         }
 384         Configuration conf = manager.getCache(realCacheName).getAdvancedCache()
 385                 .getCacheConfiguration();
 386         Properties p = new Properties();
 387         p.setProperty(IClusterServices.cacheProps.TRANSACTION_PROP.toString(),
 388                 conf.transaction().toString());
 389         p.setProperty(IClusterServices.cacheProps.CLUSTERING_PROP.toString(),
 390                 conf.clustering().toString());
 391         p.setProperty(IClusterServices.cacheProps.LOCKING_PROP.toString(), conf
 392                 .locking().toString());
 393         return p;
 394     }
 395
 396     @Override
 397     public void addListener(String containerName, String cacheName,
 398             IGetUpdates<?, ?> u) throws CacheListenerAddException {
 399         EmbeddedCacheManager manager = this.cm;
 400         Cache<Object,Object> c;
 401         String realCacheName = "{" + containerName + "}_{" + cacheName + "}";
 402         if (manager == null) {
 403             return;
 404         }
 405
 406         if (!manager.cacheExists(realCacheName)) {
 407             throw new CacheListenerAddException();
 408         }
 409         c = manager.getCache(realCacheName);
 410         CacheListenerContainer cl = new CacheListenerContainer(u,
 411                 containerName, cacheName);
 412         c.addListener(cl);
 413     }
 414
 415     @Override
 416     public Set<IGetUpdates<?, ?>> getListeners(String containerName,
 417             String cacheName) {
 418         EmbeddedCacheManager manager = this.cm;
 419         Cache<Object,Object> c;
 420         String realCacheName = "{" + containerName + "}_{" + cacheName + "}";
 421         if (manager == null) {
 422             return null;
 423         }
 424
 425         if (!manager.cacheExists(realCacheName)) {
 426             return null;
 427         }
 428         c = manager.getCache(realCacheName);
 429
 430         Set<IGetUpdates<?, ?>> res = new HashSet<IGetUpdates<?, ?>>();
 431         Set<Object> listeners = c.getListeners();
 432         for (Object listener : listeners) {
 433             if (listener instanceof CacheListenerContainer) {
 434                 CacheListenerContainer cl = (CacheListenerContainer) listener;
 435                 res.add(cl.whichListener());
 436             }
 437         }
 438
 439         return res;
 440     }
 441
 442     @Override
 443     public void removeListener(String containerName, String cacheName,
 444             IGetUpdates<?, ?> u) {
 445         EmbeddedCacheManager manager = this.cm;
 446         Cache<Object,Object> c;
 447         String realCacheName = "{" + containerName + "}_{" + cacheName + "}";
 448         if (manager == null) {
 449             return;
 450         }
 451
 452         if (!manager.cacheExists(realCacheName)) {
 453             return;
 454         }
 455         c = manager.getCache(realCacheName);
 456
 457         Set<Object> listeners = c.getListeners();
 458         for (Object listener : listeners) {
 459             if (listener instanceof CacheListenerContainer) {
 460                 CacheListenerContainer cl = (CacheListenerContainer) listener;
 461                 if (cl.whichListener() == u) {
 462                     c.removeListener(listener);
 463                     return;
 464                 }
 465             }
 466         }
 467     }
 468
 469     @Override
 470     public void tbegin() throws NotSupportedException, SystemException {
 471         EmbeddedCacheManager manager = this.cm;
 472         if (manager == null) {
 473             throw new IllegalStateException();
 474         }
 475         TransactionManager tm = manager.getCache("transactional-type")
 476                 .getAdvancedCache().getTransactionManager();
 477         if (tm == null) {
 478             throw new IllegalStateException();
 479         }
 480         tm.begin();
 481     }
 482
 483     @Override
 484     public void tcommit() throws RollbackException, HeuristicMixedException,
 485             HeuristicRollbackException, java.lang.SecurityException,
 486             java.lang.IllegalStateException, SystemException {
 487         EmbeddedCacheManager manager = this.cm;
 488         if (manager == null) {
 489             throw new IllegalStateException();
 490         }
 491         TransactionManager tm = manager.getCache("transactional-type")
 492                 .getAdvancedCache().getTransactionManager();
 493         if (tm == null) {
 494             throw new IllegalStateException();
 495         }
 496         tm.commit();
 497     }
 498
 499     @Override
 500     public void trollback() throws java.lang.IllegalStateException,
 501             java.lang.SecurityException, SystemException {
 502         EmbeddedCacheManager manager = this.cm;
 503         if (manager == null) {
 504             throw new IllegalStateException();
 505         }
 506         TransactionManager tm = manager.getCache("transactional-type")
 507                 .getAdvancedCache().getTransactionManager();
 508         if (tm == null) {
 509             throw new IllegalStateException();
 510         }
 511         tm.rollback();
 512     }
 513
 514     @Override
 515     public Transaction tgetTransaction() throws SystemException {
 516         EmbeddedCacheManager manager = this.cm;
 517         if (manager == null) {
 518             throw new IllegalStateException();
 519         }
 520         TransactionManager tm = manager.getCache("transactional-type")
 521                 .getAdvancedCache().getTransactionManager();
 522         if (tm == null) {
 523             return null;
 524         }
 525         return tm.getTransaction();
 526     }
 527
 528     @Override
 529     public boolean amIStandby() {
 530         EmbeddedCacheManager manager = this.cm;
 531         if (manager == null) {
 532             // In case we cannot fetch the information, lets assume we
 533             // are standby, so to have less responsibility.
 534             return true;
 535         }
 536         return (!manager.isCoordinator());
 537     }
 538
 539     private InetAddress addressToInetAddress(Address a) {
 540         EmbeddedCacheManager manager = this.cm;
 541         if ((manager == null) || (a == null)) {
 542             // In case we cannot fetch the information, lets assume we
 543             // are standby, so to have less responsibility.
 544             return null;
 545         }
 546         Transport t = manager.getTransport();
 547         if (t instanceof JGroupsTransport) {
 548             JGroupsTransport jt = (JGroupsTransport) t;
 549             Channel c = jt.getChannel();
 550             if (a instanceof JGroupsAddress) {
 551                 JGroupsAddress ja = (JGroupsAddress) a;
 552                 org.jgroups.Address phys = (org.jgroups.Address) c
 553                         .down(new Event(Event.GET_PHYSICAL_ADDRESS, ja
 554                                 .getJGroupsAddress()));
 555                 if (phys instanceof org.jgroups.stack.IpAddress) {
 556                     InetAddress bindAddress = ((org.jgroups.stack.IpAddress) phys)
 557                             .getIpAddress();
 558                     return bindAddress;
 559                 }
 560             }
 561         }
 562         return null;
 563     }
 564
 565     public List<InetAddress> getClusteredControllers() {
 566         EmbeddedCacheManager manager = this.cm;
 567         if (manager == null) {
 568             return null;
 569         }
 570         List<Address> controllers = manager.getMembers();
 571         if ((controllers == null) || controllers.size() == 0)
 572             return null;
 573
 574         List<InetAddress> clusteredControllers = new ArrayList<InetAddress>();
 575         for (Address a : controllers) {
 576             InetAddress inetAddress = addressToInetAddress(a);
 577             if (inetAddress != null
 578                     && !inetAddress.getHostAddress().equals(loopbackAddress))
 579                 clusteredControllers.add(inetAddress);
 580         }
 581         return clusteredControllers;
 582     }
 583
 584     public InetAddress getMyAddress() {
 585         EmbeddedCacheManager manager = this.cm;
 586         if (manager == null) {
 587             return null;
 588         }
 589         return addressToInetAddress(manager.getAddress());
 590     }
 591
 592     @Override
 593     public InetAddress getActiveAddress() {
 594         EmbeddedCacheManager manager = this.cm;
 595         if (manager == null) {
 596             // In case we cannot fetch the information, lets assume we
 597             // are standby, so to have less responsibility.
 598             return null;
 599         }
 600
 601         return addressToInetAddress(manager.getCoordinator());
 602     }
 603
 604     @Override
 605     public void listenRoleChange(IListenRoleChange i)
 606             throws ListenRoleChangeAddException {
 607         EmbeddedCacheManager manager = this.cm;
 608         if (manager == null) {
 609             // In case we cannot fetch the information, lets assume we
 610             // are standby, so to have less responsibility.
 611             throw new ListenRoleChangeAddException();
 612         }
 613
 614         if (this.roleChangeListeners == null) {
 615             this.roleChangeListeners = new HashSet<IListenRoleChange>();
 616             this.cacheManagerListener = new ViewChangedListener(
 617                     this.roleChangeListeners);
 618             manager.addListener(this.cacheManagerListener);
 619         }
 620
 621         if (this.roleChangeListeners != null) {
 622             this.roleChangeListeners.add(i);
 623         }
 624     }
 625
 626     @Override
 627     public void unlistenRoleChange(IListenRoleChange i) {
 628         EmbeddedCacheManager manager = this.cm;
 629         if (manager == null) {
 630             // In case we cannot fetch the information, lets assume we
 631             // are standby, so to have less responsibility.
 632             return;
 633         }
 634
 635         if (this.roleChangeListeners != null) {
 636             this.roleChangeListeners.remove(i);
 637         }
 638
 639         if ((this.roleChangeListeners != null && this.roleChangeListeners
 640                 .isEmpty())
 641                 && (this.cacheManagerListener != null)) {
 642             manager.removeListener(this.cacheManagerListener);
 643             this.cacheManagerListener = null;
 644             this.roleChangeListeners = null;
 645         }
 646     }
 647
 648     @Listener
 649     public class ViewChangedListener {
 650         Set<IListenRoleChange> roleListeners;
 651
 652         public ViewChangedListener(Set<IListenRoleChange> s) {
 653             this.roleListeners = s;
 654         }
 655
 656         @ViewChanged
 657         public void viewChanged(ViewChangedEvent e) {
 658             for (IListenRoleChange i : this.roleListeners) {
 659                 i.newActiveAvailable();
 660             }
 661         }
 662     }
 663 }