openflowplugin-impl/src/main/java/org/opendaylight/openflowplugin/impl/device/DeviceContextImpl.java

   1 /**
   2  * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.openflowplugin.impl.device;
   9
  10 import com.google.common.annotations.VisibleForTesting;
  11 import com.google.common.base.Preconditions;
  12 import com.google.common.util.concurrent.SettableFuture;
  13 import io.netty.util.HashedWheelTimer;
  14 import io.netty.util.Timeout;
  15 import java.math.BigInteger;
  16 import java.util.ArrayList;
  17 import java.util.HashMap;
  18 import java.util.Iterator;
  19 import java.util.List;
  20 import java.util.Map;
  21 import java.util.TreeMap;
  22 import java.util.concurrent.atomic.AtomicLong;
  23 import javax.annotation.Nonnull;
  24 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  25 import org.opendaylight.controller.md.sal.binding.api.ReadTransaction;
  26 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  27 import org.opendaylight.controller.sal.binding.api.NotificationProviderService;
  28 import org.opendaylight.openflowplugin.api.openflow.connection.ConnectionContext;
  29 import org.opendaylight.openflowplugin.api.openflow.device.DeviceContext;
  30 import org.opendaylight.openflowplugin.api.openflow.device.DeviceState;
  31 import org.opendaylight.openflowplugin.api.openflow.device.MessageTranslator;
  32 import org.opendaylight.openflowplugin.api.openflow.device.RequestContext;
  33 import org.opendaylight.openflowplugin.api.openflow.device.TranslatorLibrary;
  34 import org.opendaylight.openflowplugin.api.openflow.device.Xid;
  35 import org.opendaylight.openflowplugin.api.openflow.device.exception.DeviceDataException;
  36 import org.opendaylight.openflowplugin.api.openflow.device.handlers.DeviceContextClosedHandler;
  37 import org.opendaylight.openflowplugin.api.openflow.device.handlers.DeviceDisconnectedHandler;
  38 import org.opendaylight.openflowplugin.api.openflow.device.listener.OpenflowMessageListenerFacade;
  39 import org.opendaylight.openflowplugin.api.openflow.md.core.SwitchConnectionDistinguisher;
  40 import org.opendaylight.openflowplugin.api.openflow.md.core.TranslatorKey;
  41 import org.opendaylight.openflowplugin.api.openflow.registry.flow.DeviceFlowRegistry;
  42 import org.opendaylight.openflowplugin.api.openflow.registry.group.DeviceGroupRegistry;
  43 import org.opendaylight.openflowplugin.api.openflow.registry.meter.DeviceMeterRegistry;
  44 import org.opendaylight.openflowplugin.api.openflow.statistics.ofpspecific.MessageSpy;
  45 import org.opendaylight.openflowplugin.impl.common.NodeStaticReplyTranslatorUtil;
  46 import org.opendaylight.openflowplugin.impl.registry.flow.DeviceFlowRegistryImpl;
  47 import org.opendaylight.openflowplugin.impl.registry.group.DeviceGroupRegistryImpl;
  48 import org.opendaylight.openflowplugin.impl.registry.meter.DeviceMeterRegistryImpl;
  49 import org.opendaylight.openflowplugin.impl.services.RequestContextUtil;
  50 import org.opendaylight.openflowplugin.openflow.md.core.session.SwitchConnectionCookieOFImpl;
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.FlowCapableNodeConnector;
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeConnectorId;
  53 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.node.NodeConnector;
  54 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.node.NodeConnectorBuilder;
  55 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.node.NodeConnectorKey;
  56 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.Node;
  57 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.common.types.rev130731.PortReason;
  58 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.Error;
  59 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.FlowRemoved;
  60 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.MultipartReply;
  61 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.OfHeader;
  62 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.PacketIn;
  63 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.PacketInMessage;
  64 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.PortGrouping;
  65 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.PortStatusMessage;
  66 import org.opendaylight.yang.gen.v1.urn.opendaylight.packet.service.rev130709.PacketReceived;
  67 import org.opendaylight.yang.gen.v1.urn.opendaylight.port.statistics.rev131214.FlowCapableNodeConnectorStatisticsData;
  68 import org.opendaylight.yang.gen.v1.urn.opendaylight.port.statistics.rev131214.FlowCapableNodeConnectorStatisticsDataBuilder;
  69 import org.opendaylight.yangtools.yang.binding.ChildOf;
  70 import org.opendaylight.yangtools.yang.binding.DataObject;
  71 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  72 import org.opendaylight.yangtools.yang.binding.KeyedInstanceIdentifier;
  73 import org.opendaylight.yangtools.yang.common.RpcError;
  74 import org.opendaylight.yangtools.yang.common.RpcResult;
  75 import org.opendaylight.yangtools.yang.common.RpcResultBuilder;
  76 import org.slf4j.Logger;
  77 import org.slf4j.LoggerFactory;
  78
  79 /**
  80  *
  81  */
  82 public class DeviceContextImpl implements DeviceContext {
  83
  84     private static final Logger LOG = LoggerFactory.getLogger(DeviceContextImpl.class);
  85     public static final String DEVICE_DISCONNECTED = "Device disconnected.";
  86
  87     private final ConnectionContext primaryConnectionContext;
  88     private final DeviceState deviceState;
  89     private final DataBroker dataBroker;
  90     private final XidGenerator xidGenerator;
  91     private final HashedWheelTimer hashedWheelTimer;
  92     private Map<Long, RequestContext> requests = new TreeMap();
  93
  94     private final Map<SwitchConnectionDistinguisher, ConnectionContext> auxiliaryConnectionContexts;
  95     private final TransactionChainManager txChainManager;
  96     private TranslatorLibrary translatorLibrary;
  97     private OpenflowMessageListenerFacade openflowMessageListenerFacade;
  98     private final DeviceFlowRegistry deviceFlowRegistry;
  99     private final DeviceGroupRegistry deviceGroupRegistry;
 100     private final DeviceMeterRegistry deviceMeterRegistry;
 101     private Timeout barrierTaskTimeout;
 102     private NotificationProviderService notificationService;
 103     private final MessageSpy<Class> messageSpy;
 104     private DeviceDisconnectedHandler deviceDisconnectedHandler;
 105     private List<DeviceContextClosedHandler> closeHandlers = new ArrayList<>();
 106
 107
 108     @VisibleForTesting
 109     DeviceContextImpl(@Nonnull final ConnectionContext primaryConnectionContext,
 110                       @Nonnull final DeviceState deviceState,
 111                       @Nonnull final DataBroker dataBroker,
 112                       @Nonnull final HashedWheelTimer hashedWheelTimer,
 113                       @Nonnull final MessageSpy _messageSpy) {
 114         this.primaryConnectionContext = Preconditions.checkNotNull(primaryConnectionContext);
 115         this.deviceState = Preconditions.checkNotNull(deviceState);
 116         this.dataBroker = Preconditions.checkNotNull(dataBroker);
 117         this.hashedWheelTimer = Preconditions.checkNotNull(hashedWheelTimer);
 118         xidGenerator = new XidGenerator();
 119         txChainManager = new TransactionChainManager(dataBroker, hashedWheelTimer, 500L, 500L);
 120         auxiliaryConnectionContexts = new HashMap<>();
 121         deviceFlowRegistry = new DeviceFlowRegistryImpl();
 122         deviceGroupRegistry = new DeviceGroupRegistryImpl();
 123         deviceMeterRegistry = new DeviceMeterRegistryImpl();
 124         messageSpy = _messageSpy;
 125     }
 126
 127     /**
 128      * This method is called from {@link DeviceManagerImpl} only. So we could say "posthandshake process finish"
 129      * and we are able to set a scheduler for an automatic transaction submitting by time (0,5sec).
 130      */
 131     void submitTransaction() {
 132         txChainManager.enableCounter();
 133         txChainManager.submitTransaction();
 134     }
 135
 136     @Override
 137     public <M extends ChildOf<DataObject>> void onMessage(final M message, final RequestContext requestContext) {
 138         // TODO Auto-generated method stub
 139
 140     }
 141
 142     @Override
 143     public void addAuxiliaryConenctionContext(final ConnectionContext connectionContext) {
 144         final SwitchConnectionDistinguisher connectionDistinguisher = new SwitchConnectionCookieOFImpl(connectionContext.getFeatures().getAuxiliaryId());
 145         auxiliaryConnectionContexts.put(connectionDistinguisher, connectionContext);
 146     }
 147
 148     @Override
 149     public void removeAuxiliaryConenctionContext(final ConnectionContext connectionContext) {
 150         // TODO Auto-generated method stub
 151     }
 152
 153     @Override
 154     public DeviceState getDeviceState() {
 155         return deviceState;
 156     }
 157
 158     @Override
 159     public ReadTransaction getReadTransaction() {
 160         return dataBroker.newReadOnlyTransaction();
 161     }
 162
 163     @Override
 164     public <T extends DataObject> void writeToTransaction(final LogicalDatastoreType store,
 165                                                           final InstanceIdentifier<T> path, final T data) {
 166         txChainManager.writeToTransaction(store, path, data);
 167     }
 168
 169     @Override
 170     public <T extends DataObject> void addDeleteToTxChain(final LogicalDatastoreType store, final InstanceIdentifier<T> path) {
 171         txChainManager.addDeleteOperationTotTxChain(store, path);
 172     }
 173
 174     @Override
 175     public ConnectionContext getPrimaryConnectionContext() {
 176         return primaryConnectionContext;
 177     }
 178
 179     @Override
 180     public ConnectionContext getAuxiliaryConnectiobContexts(final BigInteger cookie) {
 181         return auxiliaryConnectionContexts.get(new SwitchConnectionCookieOFImpl(cookie.longValue()));
 182     }
 183
 184     @Override
 185     public Xid getNextXid() {
 186         return xidGenerator.generate();
 187     }
 188
 189     @Override
 190     public RequestContext lookupRequest(Xid xid) {
 191         return requests.get(xid.getValue());
 192     }
 193
 194     @Override
 195     public int getNumberOfOutstandingRequests() {
 196         return requests.size();
 197     }
 198
 199     @Override
 200     public void hookRequestCtx(final Xid xid, final RequestContext requestFutureContext) {
 201         requests.put(xid.getValue(), requestFutureContext);
 202     }
 203
 204     @Override
 205     public RequestContext unhookRequestCtx(Xid xid) {
 206         return requests.remove(xid.getValue());
 207     }
 208
 209     @Override
 210     public void attachOpenflowMessageListener(final OpenflowMessageListenerFacade openflowMessageListenerFacade) {
 211         this.openflowMessageListenerFacade = openflowMessageListenerFacade;
 212         primaryConnectionContext.getConnectionAdapter().setMessageListener(openflowMessageListenerFacade);
 213     }
 214
 215     @Override
 216     public OpenflowMessageListenerFacade getOpenflowMessageListenerFacade() {
 217         return openflowMessageListenerFacade;
 218     }
 219
 220     @Override
 221     public DeviceFlowRegistry getDeviceFlowRegistry() {
 222         return deviceFlowRegistry;
 223     }
 224
 225     @Override
 226     public DeviceGroupRegistry getDeviceGroupRegistry() {
 227         return deviceGroupRegistry;
 228     }
 229
 230     @Override
 231     public DeviceMeterRegistry getDeviceMeterRegistry() {
 232         return deviceMeterRegistry;
 233     }
 234
 235     @Override
 236     public void processReply(final OfHeader ofHeader) {
 237         final RequestContext requestContext = requests.get(ofHeader.getXid());
 238         if (null != requestContext) {
 239             final SettableFuture replyFuture = requestContext.getFuture();
 240             requests.remove(ofHeader.getXid());
 241             RpcResult<OfHeader> rpcResult;
 242             if (ofHeader instanceof Error) {
 243                 //TODO : this is the point, where we can discover that add flow operation failed and where we should
 244                 //TODO : remove this flow from deviceFlowRegistry
 245                 final Error error = (Error) ofHeader;
 246                 final String message = "Operation on device failed with xid "+ofHeader.getXid()+".";
 247                 rpcResult = RpcResultBuilder
 248                         .<OfHeader>failed()
 249                         .withError(RpcError.ErrorType.APPLICATION, message, new DeviceDataException(message, error))
 250                         .build();
 251                 messageSpy.spyMessage(ofHeader.getImplementedInterface(), MessageSpy.STATISTIC_GROUP.FROM_SWITCH_PUBLISHED_FAILURE);
 252             } else {
 253                 rpcResult = RpcResultBuilder
 254                         .<OfHeader>success()
 255                         .withResult(ofHeader)
 256                         .build();
 257                 messageSpy.spyMessage(ofHeader.getImplementedInterface(), MessageSpy.STATISTIC_GROUP.FROM_SWITCH_PUBLISHED_SUCCESS);
 258             }
 259
 260             replyFuture.set(rpcResult);
 261             try {
 262                 requestContext.close();
 263             } catch (final Exception e) {
 264                 LOG.warn("Closing RequestContext failed: {}", e.getMessage());
 265                 LOG.debug("Closing RequestContext failed.. ", e);
 266             }
 267         } else {
 268             LOG.warn("Can't find request context registered for xid : {}. Type of reply: {}. From address: {}", ofHeader.getXid(), ofHeader.getClass().getName(),
 269                     getPrimaryConnectionContext().getConnectionAdapter().getRemoteAddress());
 270         }
 271     }
 272
 273     @Override
 274     public void processReply(final Xid xid, final List<MultipartReply> ofHeaderList) {
 275         final RequestContext requestContext = requests.get(xid.getValue());
 276         if (null != requestContext) {
 277             final SettableFuture replyFuture = requestContext.getFuture();
 278             requests.remove(xid.getValue());
 279             final RpcResult<List<MultipartReply>> rpcResult = RpcResultBuilder
 280                     .<List<MultipartReply>>success()
 281                     .withResult(ofHeaderList)
 282                     .build();
 283             replyFuture.set(rpcResult);
 284             for (MultipartReply multipartReply : ofHeaderList) {
 285                 messageSpy.spyMessage(multipartReply.getImplementedInterface(), MessageSpy.STATISTIC_GROUP.FROM_SWITCH_PUBLISHED_FAILURE);
 286             }
 287
 288             try {
 289                 requestContext.close();
 290             } catch (final Exception e) {
 291                 LOG.warn("Closing RequestContext failed: {}", e.getMessage());
 292                 LOG.debug("Closing RequestContext failed.. ", e);
 293             }
 294         } else {
 295             LOG.warn("Can't find request context registered for xid : {}. Type of reply: MULTIPART. From address: {}", xid.getValue(),
 296                     getPrimaryConnectionContext().getConnectionAdapter().getRemoteAddress());
 297         }
 298     }
 299
 300     @Override
 301     public void processException(final Xid xid, final DeviceDataException deviceDataException) {
 302
 303         LOG.trace("Processing exception for xid : {}", xid.getValue());
 304
 305         final RequestContext requestContext = requests.get(xid.getValue());
 306
 307         if (null != requestContext) {
 308             final SettableFuture replyFuture = requestContext.getFuture();
 309             requests.remove(xid.getValue());
 310             final RpcResult<List<OfHeader>> rpcResult = RpcResultBuilder
 311                     .<List<OfHeader>>failed()
 312                     .withError(RpcError.ErrorType.APPLICATION, String.format("Message processing failed : %s", deviceDataException.getError()), deviceDataException)
 313                     .build();
 314             replyFuture.set(rpcResult);
 315             messageSpy.spyMessage(deviceDataException.getClass(), MessageSpy.STATISTIC_GROUP.FROM_SWITCH_PUBLISHED_FAILURE);
 316             try {
 317                 requestContext.close();
 318             } catch (final Exception e) {
 319                 LOG.warn("Closing RequestContext failed: ", e);
 320                 LOG.debug("Closing RequestContext failed..", e);
 321             }
 322         } else {
 323             LOG.warn("Can't find request context registered for xid : {}. Exception message {}",
 324                     xid.getValue(), deviceDataException.getMessage());
 325         }
 326     }
 327
 328     @Override
 329     public void processFlowRemovedMessage(final FlowRemoved flowRemoved) {
 330         //TODO: will be defined later
 331     }
 332
 333     @Override
 334     public void processPortStatusMessage(final PortStatusMessage portStatus) {
 335         messageSpy.spyMessage(portStatus.getImplementedInterface(), MessageSpy.STATISTIC_GROUP.FROM_SWITCH_PUBLISHED_SUCCESS);
 336         final TranslatorKey translatorKey = new TranslatorKey(portStatus.getVersion(), PortGrouping.class.getName());
 337         final MessageTranslator<PortGrouping, FlowCapableNodeConnector> messageTranslator = translatorLibrary.lookupTranslator(translatorKey);
 338         final FlowCapableNodeConnector flowCapableNodeConnector = messageTranslator.translate(portStatus, this, null);
 339
 340         final KeyedInstanceIdentifier<NodeConnector, NodeConnectorKey> iiToNodeConnector = provideIIToNodeConnector(portStatus.getPortNo(), portStatus.getVersion());
 341         if (portStatus.getReason().equals(PortReason.OFPPRADD) || portStatus.getReason().equals(PortReason.OFPPRMODIFY)) {
 342             // because of ADD status node connector has to be created
 343             final NodeConnectorBuilder nConnectorBuilder = new NodeConnectorBuilder().setKey(iiToNodeConnector.getKey());
 344             nConnectorBuilder.addAugmentation(FlowCapableNodeConnectorStatisticsData.class, new FlowCapableNodeConnectorStatisticsDataBuilder().build());
 345             nConnectorBuilder.addAugmentation(FlowCapableNodeConnector.class, flowCapableNodeConnector);
 346             writeToTransaction(LogicalDatastoreType.OPERATIONAL, iiToNodeConnector, nConnectorBuilder.build());
 347         } else if (portStatus.getReason().equals(PortReason.OFPPRDELETE)) {
 348             addDeleteToTxChain(LogicalDatastoreType.OPERATIONAL, iiToNodeConnector);
 349         }
 350     }
 351
 352     private KeyedInstanceIdentifier<NodeConnector, NodeConnectorKey> provideIIToNodeConnector(final long portNo, final short version) {
 353         final InstanceIdentifier<Node> iiToNodes = deviceState.getNodeInstanceIdentifier();
 354         final BigInteger dataPathId = deviceState.getFeatures().getDatapathId();
 355         final NodeConnectorId nodeConnectorId = NodeStaticReplyTranslatorUtil.nodeConnectorId(dataPathId.toString(), portNo, version);
 356         return iiToNodes.child(NodeConnector.class, new NodeConnectorKey(nodeConnectorId));
 357     }
 358
 359     @Override
 360     public void processPacketInMessage(final PacketInMessage packetInMessage) {
 361         messageSpy.spyMessage(packetInMessage.getImplementedInterface(), MessageSpy.STATISTIC_GROUP.FROM_SWITCH_PUBLISHED_SUCCESS);
 362         final TranslatorKey translatorKey = new TranslatorKey(packetInMessage.getVersion(), PacketIn.class.getName());
 363         final MessageTranslator<PacketInMessage, PacketReceived> messageTranslator = translatorLibrary.lookupTranslator(translatorKey);
 364         final PacketReceived packetReceived = messageTranslator.translate(packetInMessage, this, null);
 365         notificationService.publish(packetReceived);
 366     }
 367
 368     @Override
 369     public TranslatorLibrary oook() {
 370         return translatorLibrary;
 371     }
 372
 373     @Override
 374     public void setTranslatorLibrary(final TranslatorLibrary translatorLibrary) {
 375         this.translatorLibrary = translatorLibrary;
 376     }
 377
 378     @Override
 379     public HashedWheelTimer getTimer() {
 380         return hashedWheelTimer;
 381     }
 382
 383     @Override
 384     public void close() throws Exception {
 385         deviceState.setValid(false);
 386
 387         LOG.trace("Removing node {} from operational DS.", getDeviceState().getNodeId());
 388         addDeleteToTxChain(LogicalDatastoreType.OPERATIONAL, getDeviceState().getNodeInstanceIdentifier());
 389
 390         deviceGroupRegistry.close();
 391         deviceFlowRegistry.close();
 392         deviceMeterRegistry.close();
 393
 394         if (primaryConnectionContext.getConnectionAdapter().isAlive()) {
 395             primaryConnectionContext.setConnectionState(ConnectionContext.CONNECTION_STATE.RIP);
 396             primaryConnectionContext.getConnectionAdapter().disconnect();
 397         }
 398         for (Map.Entry<Long, RequestContext> entry : requests.entrySet()) {
 399             RequestContextUtil.closeRequestContextWithRpcError(entry.getValue(), DEVICE_DISCONNECTED);
 400         }
 401         for (ConnectionContext connectionContext : auxiliaryConnectionContexts.values()) {
 402             if (connectionContext.getConnectionAdapter().isAlive()) {
 403                 connectionContext.getConnectionAdapter().disconnect();
 404             }
 405         }
 406         for (DeviceContextClosedHandler deviceContextClosedHandler : closeHandlers) {
 407             deviceContextClosedHandler.onDeviceContextClosed(this);
 408         }
 409
 410     }
 411
 412     @Override
 413     public void onDeviceDisconnected(final ConnectionContext connectionContext) {
 414         if (this.getPrimaryConnectionContext().equals(connectionContext)) {
 415             try {
 416                 close();
 417             } catch (Exception e) {
 418                 LOG.trace("Error closing device context.");
 419             }
 420             if (null != deviceDisconnectedHandler) {
 421                 deviceDisconnectedHandler.onDeviceDisconnected(connectionContext);
 422             }
 423         } else {
 424             auxiliaryConnectionContexts.remove(connectionContext);
 425         }
 426     }
 427
 428
 429     private class XidGenerator {
 430
 431         private final AtomicLong xid = new AtomicLong(0);
 432
 433         public Xid generate() {
 434             return new Xid(xid.incrementAndGet());
 435         }
 436     }
 437
 438     @Override
 439     public RequestContext extractNextOutstandingMessage(final long barrierXid) {
 440         RequestContext nextMessage = null;
 441         final Iterator<Long> keyIterator = requests.keySet().iterator();
 442         if (keyIterator.hasNext()) {
 443             final Long oldestXid = keyIterator.next();
 444             if (oldestXid < barrierXid) {
 445                 nextMessage = requests.remove(oldestXid);
 446             }
 447         }
 448         return nextMessage;
 449     }
 450
 451     @Override
 452     public void setCurrentBarrierTimeout(final Timeout timeout) {
 453         barrierTaskTimeout = timeout;
 454     }
 455
 456     @Override
 457     public Timeout getBarrierTaskTimeout() {
 458         return barrierTaskTimeout;
 459     }
 460
 461     @Override
 462     public void setNotificationService(final NotificationProviderService notificationServiceParam) {
 463         notificationService = notificationServiceParam;
 464     }
 465
 466     @Override
 467     public MessageSpy getMessageSpy() {
 468         return messageSpy;
 469     }
 470
 471     @Override
 472     public void setDeviceDisconnectedHandler(final DeviceDisconnectedHandler deviceDisconnectedHandler) {
 473         this.deviceDisconnectedHandler = deviceDisconnectedHandler;
 474     }
 475
 476     @Override
 477     public void addDeviceContextClosedHandler(final DeviceContextClosedHandler deviceContextClosedHandler) {
 478         this.closeHandlers.add(deviceContextClosedHandler);
 479     }
 480
 481     @Override
 482     public void startGatheringOperationsToOneTransaction() {
 483         txChainManager.startGatheringOperationsToOneTransaction();
 484     }
 485
 486     @Override
 487     public void commitOperationsGatheredInOneTransaction() {
 488         txChainManager.commitOperationsGatheredInOneTransaction();
 489     }
 490
 491 }