Programming Web Apps for Tiny Devices with Java Card 3.0 Connected Edition

Transcription

1 Programming Web Apps for Tiny Devices with Java Card 3.0 Connected Edition Laurent LAGOSANTO Jean-Jacques VANDEWALLE Patrick VAN HAVER TS-5910

2 Discover the features of Java Card platform 3.0 Connected Edition illustrated with live demonstrations Learn how to program web applications for smart cards and other tiny devices 2008 JavaOne SM Conference java.sun.com/javaone 2

3 Agenda Java Card platform 3.0 overview and use cases 1 st demonstration: multimedia server Focus on web 2.0 use cases 2 nd demonstration: mashup with web widgets Focus on Java Card system programming techniques 3 rd demonstration: robots battle Wrap up 2008 JavaOne SM Conference java.sun.com/javaone 3

4 Java Card Platform 3.0 Editions Java Card Platform 3.0 Classic Edition Evolution of Java Card Platform for the same kind of devices Targets APDU based applications Binary backward compatible (at CAP file level) Out of the scope of this presentation Java Card Platform 3.0 Connected Edition Major Release: evolutions of VM and framework Introduces web applications as a core application model Leverages hardware evolutions (better connectivity, more RAM, ) Tool-assisted backward compatibility (normalizer tool) Main focus of this presentation 2008 JavaOne SM Conference java.sun.com/javaone 4

5 Java Card Platform 3.0 Connected Edition Features (1/3) New virtual machine Java Platform 6 file format: pre-verified class files packaged in Java Archive (JAR) Regular Java bytecode set (no floating point) Support for multithreading and automatic garbage collection New application model: web applications Subset of Java Servlet API v2.4 Web container is a core part of the JCRE Container managed authentication & authorization Richer APIs and language features CLDC-like APIs, generics, enums, annotations Optional file system API (suitable for large memories) 2008 JavaOne SM Conference java.sun.com/javaone 5

6 Java Card Platform 3.0 Connected Edition Features (2/3) Firewall Same rules as Java Card Platform 2.2 Extended with usability features (object ownership transfer, registry) No longer limited to a single Java technology package Extended transaction model APIs replaced by method annotations (safer, cleaner) Adapted to multithreaded runtime environment Extended memory model Compatible with Java Card Platform 2.2 Objects are created in RAM (if they fit) Automatic promotion in NVM (transitive persistence) 2008 JavaOne SM Conference java.sun.com/javaone 6

7 Java Card Platform 3.0 Connected Edition Features (3/3) Access control framework Applications are loaded into protection domains Permissions are assigned to protection domains Examples of permissions: thread creation, network access, Facilities Event framework: registry and listener-based Task registry: list of Runnables to be restarted at each platform reset Extended and classic applets APDU based application model Extended applets can use any Connected Edition features Classic applets restricted to Classic Edition APIs JCRE guarantees mono-threaded execution for classic applets 2008 JavaOne SM Conference java.sun.com/javaone 7

8 Java Card Platform 3.0 Connected Edition Targeted Devices Footprint 400 KB ROM/Flash 128 KB NVM 16 KB RAM Externally powered SIM cards USB tokens smart cards µ-controllers Additional memory optional (NAND Flash) High speed interface (USB) programmable toys 2008 JavaOne SM Conference java.sun.com/javaone 8

9 Java Card Platform 3.0 Connected Edition is the Platform of Choice for Web application use cases Serving web pages: applications come with UIs, on-card portals Offering services through web APIs Leveraging and extending the Smart Card Web Server Connected device use cases Application data update and backup (download / upload) Application data synchronization (card and server) Consuming services through web APIs Multimedia use cases Multimedia contents can be stored in the file system They can also be served by the web container 2008 JavaOne SM Conference java.sun.com/javaone 9

10 First demonstration Multimedia server 2008 JavaOne SM Conference java.sun.com/javaone 10

11 Agenda Java Card Platform 3.0 overview and use cases 1 st demonstration: multimedia use cases Focus on web 2.0 use cases 2 nd demonstration: mashup with web widgets Focus on Java Card platform programming techniques 3 rd demonstration: robots battle Wrap up 2008 JavaOne SM Conference java.sun.com/javaone 11

12 Serving Web Applications from a Java Card Platform 3 Connected Edition Allow for making personal web applications portable across system and devices Maintain privacy of personal data in a controlled local web server (that even works offline) Using AJAX development techniques allow for rich user experience even from a small device Local web applications can be mixed with online services using mashup techniques 2008 JavaOne SM Conference java.sun.com/javaone 12

13 Scenario #1: a Local Web Server The more capable the browser the richer the card web applications Fast and secure access to on-card content An alternative to remote server hosting (personal) content Runs offline 2008 JavaOne SM Conference java.sun.com/javaone 13

14 Scenario #1: Using AJAX Techniques Presentation Application Data initial rendering and behavior runs JavaScript programs upon user actions XMLHttpRequest(get/update/del data) runs JavaScript programs to decode and inject data into the page (DOM object creation or innerhtml) encoded data JavaScript, CSS, HTML, images static files runs business logic in Servlet returns data encoded accesses data resources POJOs in Java Card VM persistent heap More details at JavaOne 2007 TS-5203 Web 2.0 Applications on a Next-Generation Java Card Platform JavaOne SM Conference java.sun.com/javaone 14

15 Scenario #2: Mixing Local and Online Web Applications Local applications enriched with online content Online applications personalized with local content local web applications online web applications 2008 JavaOne SM Conference java.sun.com/javaone 15

16 Scenario #2: Using Mashup Techniques online content requested by JavaScript code using Dynamic Script Tag (DST) initial page and JavaScript code <script src= /> text/javascript f(data); returned JavaScript code implements a call to the provided callback function (f) passing its generated data as parameters resulting page 2008 JavaOne SM Conference java.sun.com/javaone 16

17 Scenario #2: Alternate Implementation Mashup Initiated by Online Code initial page and JavaScript code <script src= /> text/javascript f(data) card content fetched by DST from an online web widget resulting page 2008 JavaOne SM Conference java.sun.com/javaone 17

18 Second demonstration Mashup with web widgets 2008 JavaOne SM Conference java.sun.com/javaone 18

19 Agenda Java Card Platform 3.0 overview and use cases 1 st demonstration: multimedia server Focus on web 2.0 use cases 2 nd demonstration: mashup with web widgets Focus on Java Card Platform programming techniques 3 rd demonstration: robots battle Wrap up 2008 JavaOne SM Conference java.sun.com/javaone 19

20 Write Your Own Java Code Robot! Actions Move body (ahead, back, turn...) Fire, turn radar Events onhitbybullet, onhitwall, onscannedrobot, 2008 JavaOne SM Conference java.sun.com/javaone 20

21 Architecture of a Java Card Platform 3.0 Robot Robocode bot-proxy HTTP robot web app Implements Robocode API Translates events to HTTP requests sent to the card robot web application Executes scripts sent back by the card Implements strategy Processes game events received by HTTP requests Generates scripts of actions 2008 JavaOne SM Conference java.sun.com/javaone 21

22 Robot Web Application Design bot-proxy event control robot strategy radar enemy collection resources web tier robot logic data model 2008 JavaOne SM Conference java.sun.com/javaone 22

23 Web Tier: Roles of the Servlets 1 Servlet used by the bot-proxy Called when bot-proxy is asking for instructions Also called when an event occurred on the battle field Provides contextual parameters : X,Y robot coordinates, energy, number of remaining enemies, Or event type, bearing, distance of the enemy, 1 Servlet for robot settings configuration Called to set configuration parameters 2008 JavaOne SM Conference java.sun.com/javaone 23

24 Plumbing: Decoding the Protocol The event Servlet decodes events, creates and handles the corresponding event object public void doget(httpservletrequest req,httpservletresponse res) throws ServletException, IOException { [ ] PrintWriter out = res.getwriter(); MyBot bot=this.getservletcontext().getattribute("jc3bot.me"); String what = req.getparameter("what"); [ ] if (EVENT_SCAN.equals(what)) { bot.onscannedrobot(out, new ScannedRobotEvent(req)); } else if (EVENT_HITBYBULLET.equals(what)) { bot.onhitbybullet(out, new HitByBulletEvent(req)); } else if (EVENT_HITWALL.equals(what)) { bot.onhitwall(out, new HitWallEvent(req)); } else 2008 JavaOne SM Conference java.sun.com/javaone 24

25 Robot Logic: Enemy Scanned When an enemy is scanned Stores information in the enemy repository Turns radar to track this enemy Fires! public void onscannedrobot(printwriter out, ScannedRobotEvent e) { enemies.get().add( new Enemy(e.getName(),e.getTargetX(),e.getTargetY(), e.getbearing(), e.getdistance(), System.currentTimeMillis())); next_radar = adjustradaron( event.getradarheading(), event.getbearing()); } this.fire( out, adjustpower(e) ); 2008 JavaOne SM Conference java.sun.com/javaone 25

26 Robot Logic: Generating Scripts Actions and parameters written in HTTP stream public class Robot { [ ] public final void fire(printwriter out, int power) { out.println("fire"); out.println(power); } public final void ahead(printwriter out, int distance) { out.println("ahead"); out.println(distance); } 2008 JavaOne SM Conference java.sun.com/javaone 26

27 Data Model: Transient Storage During a round, every scanned enemy is stored in a collection (that must remain in RAM for efficiency) public class Robot { TransientReference<EnemyCollection> enemies = new TransientReference(new EnemyCollection()); [ ] } public class EnemyCollection { private Hashtable<Enemy> enemies; public Enemy add(enemy en){ return enemies.put(en.name, en); } public EnemyCollection () { enemies = new Hashtable<Enemy>(); } [ ] } 2008 JavaOne SM Conference java.sun.com/javaone 27

28 Data Model: Persistent Storage Statistics are written in the file system public class Stats { } public void savestats() { try { FileConnection fc= (FileConnection)Connector.open("file:///~/stats.bin"); DataOutputStream os = fc.opendataoutputstream(); os.writebyte( ); } catch( IOException e ) { } } 2008 JavaOne SM Conference java.sun.com/javaone 28

29 Packaging and Deployment Packaging Same packaging format as Java Platform, Enterprise Edition (Java EE platform) servers:.war files WAR files are JAR files containing codes, resources, and descriptors Can be built by off-the-shelf tools Descriptors WEB-INF/web.xml: subset of the Java Servlet descriptor META-INF/MANIFEST.MF: deployment information META-INF/javacard.xml: Java Card Platform specific descriptor Deployment means Over HTTP ant tasks available 2008 JavaOne SM Conference java.sun.com/javaone 29

30 Third demonstration Robots battle 2008 JavaOne SM Conference java.sun.com/javaone 30

31 Wrap up What you ve seen during this session Overview of Java Card Platform 3.0 features and use cases Web programming techniques applied to the smart card Java Card Platform 3.0 is powerful enough to program games Participate to the Java Card Coding Contest Build your own robot! Finalists will fight on stage, during the Toy Show, on Day 4 More info on the Sun and Gemalto booths Free your creativity with Java Card Platform JavaOne SM Conference java.sun.com/javaone 31

32 Java Card Platform 3.0 Availability Specification and development kit publicly available TCK available end of 2008: required for products issuance Will be complemented with Global Platform Card Spec 3.0 Candidate technology for the upcoming ETSI Release JavaOne SM Conference java.sun.com/javaone 32

33 More information BOF-5366: Java Card Technology Demo Internals Unveiled Sebastian Hans and Thierry Violleau, Sun Microsystems, Inc. Tuesday May 06 20:30-21:20 - Moscone Center - Esplanade 302 TS-5940: Getting Started with the Java Card 3.0 Platform Bela Gangal, Sun Microsystems, Inc.; Anki Nelaturu, Sun Microsystems, Inc.; Eric Vetillard, Trusted Labs Tuesday May 06 18:00-19:00 - Moscone Center - Esplanade 303 BOF-5611: Free Mobile-to-Mobile Money Transmission Proves Popular in Many Countries Ram Banerjee, Sun Microsystems, Inc.; Jean-Yves Bitterlich, Sun Microsystems, Inc. Thursday May 08 20:30-21:20 - Moscone Center - Esplanade 303 Java card coding contest JavaOne SM Conference java.sun.com/javaone 33

34 Laurent LAGOSANTO Jean-Jacques VANDEWALLE Patrick VAN HAVER TS JavaOne SM Conference java.sun.com/javaone 34