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Atlas & Atlas Reactivity Engine Hands -on Session Mobile Computing - CNT 5517-5564. Dr. Sumi Helal Professor Computer & Information Science & Engineering Department University of Florida, Gainesville, FL 32611 [email protected] . Agenda. Demo Knopflerfish Atlas Middleware

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Atlas & Atlas Reactivity Engine

Hands-on SessionMobile Computing - CNT 5517-5564

Dr. SumiHelal


Computer & Information Science & Engineering Department

University of Florida, Gainesville, FL 32611

[email protected]

  • Demo
    • Knopflerfish
    • Atlas Middleware
    • Atlas Emulators
    • KitSampleApp
    • Atlas Reactivity Engine
  • Atlas Service API
    • AtlasService & AtlasClient Interface
    • KitSampleApp Code Study
  • ARE Code Review
  • Q&A
project set up
Project Set Up
  • Install KnophlerfishOSGi (Version 1.3.5)
  • Install Atlas middleware
  • Install Atlas Device Emulators
  • Atlas demo application
  • Install Atlas Reactivity Engine

(You may find all the links in


Install Knophlerfish

  • Download and install.
  • After installation, launch the KnopflerfishOSGi framework by double clicking the executable JAR file “framework.jar” or typing “java –jar framework.jar” in the command line.
  • The OSGi window (right) will pop up.

Install Atlas Middleware

  • Install the middlewarebundles. Click FileOpen Bundles in the OSGi menu
  • Launch all middleware bundles
  • Bundles reside in the directory:
  • …\AtlaSoft-1.5 clean\AtlaSoft-1.5 copy\atlas\

Install Atlas Device Emulators

  • Device emulators include:
    • DigitalContactSensorEmulator
    • HS322ServoEmulator
    • HumiditySensorEmulator
    • InterlinkPressureSensorEmulator
    • TemperatureSensorEmulator
  • Install and launch
  • The GUI for the emulators is shown (right)

Atlas Demo Application

  • KitSampleApp.jar is an Atlas demo application (bundle) that will use the device services provided by the emulator bundles.
  • Install the Atlas Kit Sample Application bundle. Click FileOpen Bundles in the OSGi menu, launch KitSampleApp.jar.
  • The GUI for the kit sample application (right). Note that devices are shown as offline if their corresponding service bundles have not yet been activated
atlas demo application
Atlas Demo Application
  • Customize sensor measurements. Readings and the sampling rate of the Pressure sensor can now be customized using the GUI interface. User can change their values by either sliding the slider or typing in a value in the text box. Once changes are applied by pressing the update button, they will be reflected in the application window.
  • Maneuvering servos. Controlling the servo is the other way around since it is an actuator. Users issue “move servo” command from the application window and specify a turning angle by sliding the slider. The servo emulator will virtually turn the angle and shows the current position.
  • Uninstall emulators. Uninstalling emulators is easy. Just click on the close button on the emulator window. The bundle will be ejected from the OSGi automatically. And the device icons on the application will return to offline.

Install Reactivity Engine

  • Find the engine in:
  • …\AtlasRE\ATLAS RE REFERENCE IMPLEMENTATION\src\AtlasReactivityEngine10\jars\ReactiveEngine.jar
  • Install and launch Atlas Reactivity Engine. The GUI for it will pop up immediately.(Right)
reactivity engine code review
Reactivity Engine Code Review
  • An OSGi bundle is basically like a normal Java application instantiated by an Activator class.
  • Each bundle have its own Activator which links the application into OSGi.
  • Reactivity Engine is implemented as an OSGi bundle as well.
  • Our job mainly focuses on the .java file “”

ATLAS Service API*


atlas service
Atlas Service
  • Atlas Service
    • Providing basic Atlas Service Functions such as sensor data subscription & delivery
    • A base class (interface) for developers to extend and build their own Atlas device services, e.g. temperature sensor, sensor emulators.
    • Two versions (package:
      • Interface AtlasService
      • Class AtlasServieClass
    • Key methods:
      • DataHandler(String, String)
      • subscribeToSensorData(AtlasClient)
      • unsubscribeToSensorData(AtlasClient)
      • getData(AtlasService) -> getSensorReading(AtlasClient) *
atlas client
Atlas Client
  • Atlas Client
    • An interface implemented by applications require sensor data from the Atlas network
    • For example, KitSampleApp and ARE are Atlas Clients.
    • package:
    • Key methods:
      • ReceivedData(String, Properties)
command interpreter
Command Interpreter
  • LIST: list all the basic events, basic actions, user-defined events, user-defined actions and rules.
  • BASIC: list all the basic events, basic actions.
  • DEFINE: used to define event, condition
    • Define atomic event:

DEFINE event e1=ref_ID (range)

    • Define composite event:

DEFINE event e2=e1+e2*e3

    • Define action:

DEFINE action a1=ref_ID(range)

command interpreter1
Command Interpreter
  • DEFINE: used to define event, condition
    • Define condition:

DEFINE condition c1=true (or false)

    • Define rule:

DEFINE rule r1=e1,c1,a1

  • RUN
  • STOP