Examples of com.sun.sgs.service.DataService

com.sun.sgs.service.DataService
Provides facilities for services to manage access to shared, persistent objects. In addition to the methods provided by {@link DataManager}, this interface includes methods for an additional set of service bindings. These service bindings are intended to by used by services to support their needs to store objects persistently. The objects associated with service bindings are independent of the objects bound through methods defined on DataManager. Services should insure that they use unique names for service bindings by using their class or package name as the prefix for the name.

      lastKey = nodePrefix;
  }


  /** {@inheritDoc} */
  public void run() {
      DataService dataService =
    ClientSessionServiceImpl.getInstance().getDataService();
      // TBD: this could use a BindingKeyedMap.
      String key = dataService.nextServiceBoundName(lastKey);
      if (key != null && key.startsWith(nodePrefix)) {
    TaskService taskService =
        ClientSessionServiceImpl.getTaskService();
    taskService.scheduleTask(
        new CleanupDisconnectedSessionTask(key));

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      this.key = key;
  }


  /** {@inheritDoc} */
  public void run() {
      DataService dataService =
    ClientSessionServiceImpl.getInstance().getDataService();
      ClientSessionImpl sessionImpl =
    (ClientSessionImpl) dataService.getServiceBinding(key);
      sessionImpl.notifyListenerAndRemoveSession(
    dataService, false, true);
  }

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     * within a transaction.
     */
    private static Map<Long, Set<ProtocolDescriptor>>
  getProtocolDescriptorsMap()
    {
  DataService dataService = getInstance().getDataService();
  Map<Long, Set<ProtocolDescriptor>> protocolDescriptorsMap;
  try {
      protocolDescriptorsMap = Objects.uncheckedCast(
    dataService.getServiceBinding(PROTOCOL_DESCRIPTORS_MAP_KEY));
  } catch (NameNotBoundException e) {
      protocolDescriptorsMap =
    new ScalableHashMap<Long, Set<ProtocolDescriptor>>();
      dataService.setServiceBinding(PROTOCOL_DESCRIPTORS_MAP_KEY,
            protocolDescriptorsMap);
  }
  return protocolDescriptorsMap;
    }

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   * also removes the protocol descriptors for the node
   * specified during construction.
   */
  public void run() {
      String sessionServerKey = getClientSessionServerKey(nodeId);
      DataService dataService = getInstance().getDataService();
      try {
    dataService.removeObject(
        dataService.getServiceBinding(sessionServerKey));
    getProtocolDescriptorsMap().remove(nodeId);
      } catch (NameNotBoundException e) {
    // already removed
    return;
      } catch (ObjectNotFoundException e) {
      }
      dataService.removeServiceBinding(sessionServerKey);
  }

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  this.identity = identity;
  this.deliveries = deliveries;
  this.nodeId = sessionService.getLocalNodeId();
        this.maxMessageLength = maxMessageLength;
  writeBufferCapacity = sessionService.getWriteBufferSize();
  DataService dataService = sessionService.getDataService();
  ManagedReference<ClientSessionImpl> sessionRef =
      dataService.createReference(this);
  id = sessionRef.getId();
  this.wrappedSessionRef =
      dataService.createReference(new ClientSessionWrapper(sessionRef));
  idBytes = id.toByteArray();
  // TBD: these service bindings could be stored in a BindingKeyedMap
  // instead.
  dataService.setServiceBinding(getSessionKey(), this);
  dataService.setServiceBinding(getSessionNodeKey(), this);
  dataService.setServiceBinding(getEventQueueKey(), new EventQueue(this));
  logger.log(Level.FINEST, "Stored session, identity:{0} id:{1}",
       identity, id);
    }

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  if (newNodeId != sessionService.getLocalNodeId()) {
      throw new IllegalArgumentException(
    "newNodeId:" + newNodeId + " must match the local node ID:" +
    sessionService.getLocalNodeId());
  }
  DataService dataService = sessionService.getDataService();
  dataService.markForUpdate(this);
  dataService.removeServiceBinding(getSessionNodeKey());
  nodeId = newNodeId;
  // TBD: this could use a BindingKeyedMap.
  dataService.setServiceBinding(getSessionNodeKey(), this);
    }

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     * Returns the event queue for the client session with the specified
     * {@code sessionId}, or null if the event queue is not bound in the
     * data service.
     */
    private static EventQueue getEventQueue(byte[] sessionId) {
  DataService dataService =
      ClientSessionServiceImpl.getInstance().getDataService();
  String eventQueueKey = getEventQueueKey(sessionId);
  try {
      return (EventQueue) dataService.getServiceBinding(eventQueueKey);
  } catch (NameNotBoundException e) {
      return null;
  }
    }

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  /**
   * Constructs an event queue for the specified {@code sessionImpl}.
   */
  EventQueue(ClientSessionImpl sessionImpl) {
      DataService dataService =
    sessionImpl.sessionService.getDataService();
      sessionRef = dataService.createReference(sessionImpl);
      queueRef = dataService.createReference(
    new ManagedQueue<SessionEvent>());
      writeBufferAvailable = sessionImpl.writeBufferCapacity;
  }

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    }
    return;
      }


      ManagedQueue<SessionEvent> eventQueue = getQueue();
      DataService dataService =
    ClientSessionServiceImpl.getInstance().getDataService();
      
      for (int i = 0; i < sessionService.eventsPerTxn; i++) {
    SessionEvent event = eventQueue.poll();
    if (event == null) {
        // no more events
        // TBD: should the session's task queue for servicing
        // events be cleared?
        return;
    }


    logger.log(Level.FINEST, "processing event:{0}", event);


                int cost = event.getCost();
    if (cost > 0) {
        // TBD: this update is costly.
        dataService.markForUpdate(this);
        writeBufferAvailable += cost;
        if (logger.isLoggable(Level.FINEST)) {
            logger.log(Level.FINEST,
           "{0} cleared reservation of " +
           "{1,number,#} bytes, leaving {2,number,#}",

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  /* -- Implement ManagedObjectRemoval -- */


  /** {@inheritDoc} */
  public void removingObject() {
      try {
    DataService dataService =
        ClientSessionServiceImpl.getInstance().getDataService();
    dataService.removeObject(queueRef.get());
      } catch (ObjectNotFoundException e) {
    // already removed.
      }
  }

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