public void updateRegularData(final String sensorclassID, final Node[] nodes) {
  //create a list for the sensor data
  List<SimpleSensor> sensorList = new ArrayList<SimpleSensor>();
  //traverse all nodes of the sensorclass
  for(Node node : nodes) {
    //and every sensor of a node
    for(Sensor sensor : node.getSensors()) {
      //create new simplesensor with its properties
      SimpleSensor newSensor = new SimpleSensor();
      newSensor.setId(sensor.getID());
      newSensor.setName(sensor.getName());
      newSensor.setValue(sensor.getSensorValue().getValue());
      newSensor.setMax(sensor.getSensorValue().getMax());
      newSensor.setMin(sensor.getSensorValue().getMin());
      newSensor.setUnit(sensor.getSensorValue().getUnit());
      newSensor.setOnline(!sensor.isOffline());
      newSensor.setParent(node.getID());
      //and put it into the list
      sensorList.add(newSensor);
    }
  }
  //update the data of the model with the newly created list
  SensorModelProvider.INSTANCE.updateData(sensorclassID, sensorList);
  MonitoringView.defaultDisplay.asyncExec(new MyRunnable(sensorclassID));
}

private class MyRunnable implements Runnable {
  private final String sensorclassID;
  MyRunnable(String sensorclassID) {
    this.sensorclassID = sensorclassID;
  }
  @Override
  public void run() {
    //this call does not affect anything
    UICallBack.activate(sensorclassID);
    //check whether there is already a view for displaying the data
    if(!manager.containsViewer(sensorclassID)) {
      //if not, create a new one
      manager.createViewer(MonitoringView.TOP_CONTAINER, sensorclassID);
    }
    else {
      //otherwise just update the view
      manager.updateViewer(sensorclassID);
    }
    //this call does not affect anything
    UICallBack.deactivate(sensorclassID);
  }
}

        ISessionStore sessionStore = RWT.getSessionStore();
        sessionStore.addSessionStoreListener(new SessionStoreListener()
        {
            public void beforeDestroy(SessionStoreEvent event)
            {
              UICallBack.deactivate(key);
            }
        });