Atlas & Atlas Reactivity - PowerPoint Presentation

Slide1

Atlas & Atlas Reactivity Engine Hands-on SessionMobile Computing - CNT 5517-5564

Dr.

Sumi

Helal

Professor

Computer & Information Science & Engineering Department

University of Florida, Gainesville, FL 32611

helal@cise.ufl.edu

AgendaDemoKnopflerfishAtlas MiddlewareAtlas EmulatorsKitSampleAppAtlas Reactivity EngineAtlas Service APIAtlasService & AtlasClient InterfaceKitSampleApp Code Study ARE Code ReviewQ&A

DEMO

Project Set UpInstall Knophlerfish OSGi (Version 1.3.5)http://www.knopflerfish.org/download.html#1.3.5Install Atlas middlewarehttp://www.icta.ufl.edu/atlas/Install Atlas Device Emulatorshttp://www.icta.ufl.edu/atlas/emulator/Atlas demo applicationInstall Atlas Reactivity Enginehttp://www.icta.ufl.edu/atlas/are/(You may find all the links in http://www.icta.ufl.edu/atlas/

)

Install Knophlerfish Download and install.After installation, launch the Knopflerfish

OSGi

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 middleware bundles. 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:DigitalContactSensorEmulatorHS322ServoEmulatorHumiditySensorEmulatorInterlinkPressureSensorEmulatorTemperatureSensorEmulator

Install and launch

The GUI for the emulators is shown (right)

Atlas Demo ApplicationKitSampleApp.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 ApplicationCustomize 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.jarInstall and launch Atlas Reactivity Engine. The GUI for it will pop up immediately.(Right)

Reactivity Engine Code ReviewAn 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 “KitSampleApp.java”

ATLAS Service API** http://www.icta.ufl.edu/atlas/emulator/AtlasDev_Javadocs/doc/

Atlas ServiceAtlas ServiceProviding basic Atlas Service Functions such as sensor data subscription & deliveryA base class (interface) for developers to extend and build their own Atlas device services, e.g. temperature sensor, sensor emulators. Two versions (package: com.pervasa.atlas.dev.service)Interface AtlasServiceClass AtlasServieClassKey methods:DataHandler(String, String)subscribeToSensorData(AtlasClient)unsubscribeToSensorData(AtlasClient)getData(AtlasService) -> getSensorReading(AtlasClient) *

Atlas ClientAtlas ClientAn interface implemented by applications require sensor data from the Atlas networkFor example, KitSampleApp and ARE are Atlas Clients.package: com.pervasa.atlas.dev.serviceKey methods:ReceivedData(String, Properties)

Push & Pull APIsPushPullEmulatorMethod nameContactSensorvoid getContactReading(AtlasClient ac)InterlinkPressurevoid getPressureReading(AtlasClient ac)Humidityvoid getSensorReading(AtlasClient ac)Temperaturevoid getSensorReading(AtlasClient ac)Method name

void

subscribeToSensorReading(AtlasClient

ac)

void

unsubscribeToSensorReading

(

AtlasClient

ac)

void

ReceivedData

(

AtlasClient

ac)

CODE REVIEW

Command InterpreterLIST: 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, conditionDefine atomic event: DEFINE event e1=ref_ID (range)Define composite event: DEFINE event e2=e1+e2*e3Define action: DEFINE action a1=ref_ID(range)

Command InterpreterDEFINE: used to define event, conditionDefine condition: DEFINE condition c1=true (or false)Define rule: DEFINE rule r1=e1,c1,a1RUNSTOP

Q & A