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ATM Terminal Services the RESTful Way
- 1. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion ATM Terminal Services the RESTful Way JavaOne India 2013 Kausal Malladi Srivatsan Sridharan International Institute of Information Technology - Bangalore May 9, 2013
- 2. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion About Me An M.Tech. student from IIIT-B specializing in Computer Science Systems Engineer at Infosys Limited for 2 years A B.Tech. graduate specialized in Information Technology from JNTU, Hyderabad Interests Theoretical Computer Science Machine Learning Information Retrieval Web Services Hobbies Occasional Blogging Music Cricket My website - http://www.kausalmalladi.tk JavaOne India 2013
- 3. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion Agenda 1 Introduction 2 The Idea 3 Implementing the RESTful Way System Architecture How is REST effective? 4 Demonstration 5 Conclusion JavaOne India 2013
- 4. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion REpresentational State Transfer Roy Fielding (2000)’s dissertation An architectural style! Resource oriented Resources identified by URIs (Uniform Resource Identifiers) Stateless messages which are self descriptive Resources - Conceptual target of a Hyperref Resources - Retrieved as complete representation of concepts JavaOne India 2013
- 5. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion REpresentational State Transfer Multiple representations of data XML, Plain Text, HTML, RSS, JSON... All resources mapped to HTTP methods GET, POST, PUT, DELETE (Universal Verbs) URIs - Nouns Transport level security! A few DOs and DON’Ts on HTTP leads to REST style easily! JavaOne India 2013
- 6. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion Motivation Design a robust e-voting system Using most of the existing infrastructure (ATMs) Minimize costs to governments Highly scalable Real-time Performance Security and Voting guidelines to be adhered to! JavaOne India 2013
- 7. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion Why using ATMs? Highly scalable infrastructure already setup Good on-going research, to include Non-Financial Services Few modifications to business logic and database schema of Banks can result in incorporating several Non-Financial Services Issues to be addressed: Increased load on Bank Servers Heavy traffic flow all the way Adherence to Banking and Voting process related issues Security! User Interface JavaOne India 2013
- 8. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion Architecture Available Options Simple extension to existing Architecture Web Services Simple extension isn’t effective! Existing Architecture not easily known Not an easy task Huge loads on servers Architecture is not same across all Banks Web Services chosen because they can be plugged in anywhere without much difficulty! JavaOne India 2013
- 9. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion High Level Architecture JavaOne India 2013
- 10. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion Exposed Web Services JavaOne India 2013
- 11. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion Why REST over SOAP/WSDL? REST is cleaner than SOAP Safe encapsulation of Legacy systems REST isn’t any obscure, its the way Web works aided with some rules! Plain Text Data exchange Not many standards to follow other than basic HTTP methods! JavaOne India 2013
- 12. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion Features in our system Registration of Right to Vote ATM Card registration for Voting Robust e-Voting system JavaOne India 2013
- 13. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion Uncovering the e-Voting System 1 Voter requests for One Time Password (OTP) and List of Candidates on SMS 2 User authenticates himself with ATM PIN and OTP 3 Interface to capture Votes for all elections is loaded 4 User enters the corresponding Candidate ID in the available TextBox along with Voting PIN 5 Vote Count for corresponding candidate is updated 6 Instant result availability - key feature! JavaOne India 2013
- 14. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion e-Voting : Interaction among Web Services JavaOne India 2013
- 15. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion Advantages of using REST style Scalable Components Simple interfaces Independently deployable Secure Easy real-time deployment Real-time performance Multiple data formats Lesser loads on servers JavaOne India 2013
- 16. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion Scalability REST encourages using good practices for Scalability Each Web Service can be deployed on a separate server Ensures the services aren’t affected by performance bottlenecks Very close to real-time deployment Easier Functional Scalability More Non-Functional Services can be added to the ATM Terminals JavaOne India 2013
- 17. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion Security Security a serious issue! ATMs in private networks of Banks All messages transferred via SSL (Secure Sockets Layer) Messages required to be transferred directly between the Election Authority and the Client are encrypted using a shared key (2048 bit) between ATM Terminal Client and Election Authority Bank merely forwards the messages to Election Authority but will NOT be able to read it! JavaOne India 2013
- 18. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion Real-time Deployment Web Services can be deployed on different servers as interfaces are well-defined Supports deployment on distributed servers Real-time performance because no much interaction latency Banks already have well set-up infrastructure and setting up a robust infrastructure for Election Authority can handle huge requests, which is a typical scenario of an e-Voting system JavaOne India 2013
- 19. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion Multiple Data Formats Parsing XML is a costlier process SOAP/WSDL allows only XML for interactions XML, JSON, HTML, Plain Text are allowed in REST Parsing one data format to other not required, as the Web services can agree on a single data format as simple as Plain Text for simplicity JavaOne India 2013
- 20. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion Load on Servers In an application where large number of requests are to be served, storing state information can lead to performance bottlenecks e-Voting is a system where almost 100000 clients may perform some operation plus the normal financial transactions on ATM terminals are also to be satisfied In REST, the servers are not required to maintain state of clients Messages contain necessary information required for a Web Service, including but not limited to state of the client JavaOne India 2013
- 21. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion A Small Demonstration All Web Services hosted on one machine only, this is just for understanding of the application JavaOne India 2013
- 22. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion Winding it up... REST style can facilitate many Non-Financial Services on ATM Terminals Performance guaranteed Scalable, Real-time Deployment of Web Services to accomplish several additional tasks on ATMs Using REST and making excellent use of existing ATM-Bank infrastructure, a robust e-Voting system can be developed “Statelessness means that the client’s state is not maintained by server, which states that the performance bottlenecks don’t arise!” JavaOne India 2013
- 23. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion Questions? JavaOne India 2013
- 24. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion Acknowledgement Mr. Sastry Malladi - Chief Architect, Stubhub Inspired me to try on a big stage like this Always provided several valuable ideas w.r.t. technology My encounter with “REST” happened because of him! Dr. L T Jayprakash - Associate Professor, IIIT-B Gave me freedom to architect the system JavaOne India 2013
- 25. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion Connect! JavaOne India 2013
- 26. Agenda Introduction The Idea Implementing the RESTful Way Demonstration Conclusion Thank you! Kausal.Malladi@iiitb.org kausalmalladi@gmail.com JavaOne India 2013