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.

   * also removes the protocol descriptors for the node
   * specified during construction.
   */
  public void run() {
      String sessionServerKey = getClientSessionServerKey(nodeId);
      DataService dataService = 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.properties = properties;
        }


        /** Starts the application, throwing an exception on failure. */
        public void run() throws Exception {
            DataService dataService =
                Kernel.proxy.getService(DataService.class);
            try {
                // test to see if this name if the listener is already bound...
                dataService.getServiceBinding(StandardProperties.APP_LISTENER);
            } catch (NameNotBoundException nnbe) {
                // ...if it's not, create and then bind the listener
                AppListener listener =
                    (new PropertiesWrapper(properties)).
                    getClassInstanceProperty(StandardProperties.APP_LISTENER,
                                             AppListener.class, new Class[] {});
                if (listener instanceof ManagedObject) {
                    dataService.setServiceBinding(
                            StandardProperties.APP_LISTENER, listener);
                } else {
                    dataService.setServiceBinding(
                            StandardProperties.APP_LISTENER,
                            new ManagedSerializable<AppListener>(listener));
                }


                // since we created the listener, we're the first one to

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    /** {@inheritDoc} */
    @SuppressWarnings("unchecked")
    public V remove(Object key) {
  checkKey("key", key);
  DataService dataService = BindingKeyedCollectionsImpl.getDataService();
  String bindingName = getBindingName((String) key);
  V value = null;
  try {
      ManagedObject v = dataService.getServiceBinding(bindingName);
      if (v instanceof Wrapper) {
    value = (V) ((Wrapper) v).get();
    dataService.removeObject(v);
      } else {
    value = (V) v;
      }
      dataService.removeServiceBinding(bindingName);
  } catch (NameNotBoundException e) {
  }
  return value;
    }

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     * @param  keyPrefix a key prefix
     * @returns  {@code true} if the {@code keyPrefix} corresponds to an
     *    empty map 
     */
    private static boolean isEmptyInternal(String keyPrefix) {
  DataService dataService = BindingKeyedCollectionsImpl.getDataService();
  String key = dataService.nextServiceBoundName(keyPrefix);
  return key == null || !key.startsWith(keyPrefix);
    }

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    /**
     * Returns {@code true} if a service binding with the specified
     * {@code bindingName} exists.
     */
    private static boolean containsKeyInternal(String bindingName) {
  DataService dataService = BindingKeyedCollectionsImpl.getDataService();
  boolean containsKey = false;
  try {
      dataService.getServiceBinding(bindingName);
      containsKey = true;
  } catch (NameNotBoundException e) {
  } catch (ObjectNotFoundException e) {
      containsKey = true;
  }

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     * {@code false}.
     */
    private static boolean removeOverrideInternal(String bindingName) {
  boolean previouslyMapped = containsKeyInternal(bindingName);
  if (previouslyMapped) {
      DataService dataService =
    BindingKeyedCollectionsImpl.getDataService();
      try {
    removeValue(bindingName);
      } catch (ObjectNotFoundException ignore) {
      }
      dataService.removeServiceBinding(bindingName);
  }
  return previouslyMapped;
    }

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     * @throws  NameNotBoundException if the service binding does not exist
     * @throws  ObjectNotFoundException if the value associated with the
     *    specified {@code bindingName} has been removed
     */
    private static void removeValue(String bindingName) {
  DataService dataService =
      BindingKeyedCollectionsImpl.getDataService();
  ManagedObject v = dataService.getServiceBinding(bindingName);
  if (v instanceof Wrapper) {
      dataService.removeObject(v);
  }
    }

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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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