JSON is one of the most widely used data-interchange format. There is a large number of tools open for modelling with i*. However, none of them provides supporting for JSON. In this paper we propose iStarJSON language, a JSON-based proposal for interchanging i* models. We also, present an open source software that transforms XML-based format models to JSON models that expose a set of web services for mining iStarJSON models.

1. iStarJSON: A Lightweight
Data-Format for i* Models
Oscar Franco-Bedoya
ohernan@essi.upc.edu
David Ameller
dameller@essi.upc.edu
Dolors Costal
dolors@essi.upc.edu
Lidia López
llopez@essi.upc.edu

2. 2
Agenda
Motivation
iStarJSON Language
iStarJSON Services
IStarJSON PoC
Conclusions & Future Work
1
2
3
4
5
iStarJSON:ALightweightData-Formatfori*Models

3. 3
iStarJSON:ALightweightData-Formatfori*Models
iStarJSON has been carried out in the
context of a general framework for
Open Source Software ECOsystems
(OSSECOs) quality analysis and
modelling process.
i* is used to represent OSSECOs, and
the framework uses model analysis for
OSSECO quality analysis (e.g.,
identifying main goals, members
relationships, strategic dependencies)
Motivation

4. 4
iStarJSON:ALightweightData-Formatfori*Models
Source: Programmable Web Site
Over more than 16.000 APIs
JSON trend is growing
2005 2007 2009 2011 2013
80%
70%
60%
50%
40%
30%
20%
10%
API Data Exchange: XML vs. JSON
XML
JSON

5. 5
ISTARJSON LANGUAGE
iStarJSON:ALightweightData-Formatfori*Models

6. 6
iStarJSON:ALightweightData-Formatfori*Models
Source: iStar Wiki
G = (V;E)
V = {actor; agent; role; position}U {goal; task; resource; softgoal; belief }
An iStar model is a directed graph
Atype = {association;dependency;means_end;decomposition;contribution}
Dependencies are represented by three nodes (depender, dependee and dependum) and two
links, one from the depender to the dependum and other from the dependum to the dependee.

7. 7
iStarJSON:ALightweightData-Formatfori*Models
iStarJSON
from iStarML hierarchical structure to
iStarJSON graph structure
Graph structure does not affect to the i*
syntax or semantics
Graph structure allow using existing
tools and algorithms for graph
manipulation (e.g., graph layouts, node
centrality, shortest path)

8. 8
iStarJSON:ALightweightData-Formatfori*Models
iStarJSON (partial) Schema

9. 9
iStarJSON:ALightweightData-Formatfori*Models
iStarJSON (partial) Example

10. 10
ISTARJSON OSS PROJECT
iStarJSON:ALightweightData-Formatfori*Models

11. 11
iStarJSON:ALightweightData-Formatfori*Models
iStarJSON Project Architecture

12. 12
iStarJSON:ALightweightData-Formatfori*Models
iStarJSON project in Github
https://github.com/UPC-gessi-oscar-franco/iStarJson

13. 13
ISTARJSON PoC
iStarJSON:ALightweightData-Formatfori*Models

14. 14
iStarJSON:ALightweightData-Formatfori*Models
iStarJSON REST Web Services
iStarML to iStarJSON
converter
iStarJSON Validator
iStarJSON Graph
Generator
1
2
3

15. 15
iStarJSON:ALightweightData-Formatfori*Models
i* Model for Testing

16. 16
iStarJSON:ALightweightData-Formatfori*Models
iStarML to iStarJSON Converter
curl -v -H "Content-Type: application/xml" -X POST --data @Test2.istarml
http://localhost:8080/iStarJSONServiceREST/istar/istarToJSON >Test2.istarjson

17. 17
iStarJSON:ALightweightData-Formatfori*Models
iStarJSON Validator
curl -v -H "Content-Type: application/xml" -X POST --data @Test2.json
http://localhost:8080/iStarJSONServiceREST/istar/istarJSONvalidator > valid.txt
curl -v -H "Content-Type: application/xml" -X POST --data @Test2Bad.json
http://localhost:8080/iStarJSONServiceREST/istar/istarJSONvalidator > invalid.txt

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iStarJSON:ALightweightData-Formatfori*Models
iStarJSON Graph Generator
curl -v -H "Content-Type: application/xml" -X POST --data @Test2.json
"http://localhost:8080/iStarJSONServiceREST/istar/istarJSONconverter/param?lay
aout=dot&type=pdf" >grap.pdf

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iStarJSON:ALightweightData-Formatfori*Models
Graph Visualization
Generated from an iStarML file
Just in
case…

20. 20
iStarJSON on the cloud (AZURE)
• Converter
curl -v -H "Content-Type: application/xml" -X POST --data
@Test2.istarml
http://testoneosseco.azurewebsites.net/iStarJSONServiceREST
/istar/istarToJSON
• Validator
curl -v -H "Content-Type: application/xml" -X POST --data
@Test2.json
http://testoneosseco.azurewebsites.net/iStarJSONServiceREST
/istar/istarJSONvalidator
• Graph Generator: Coming soon!
iStarJSON:ALightweightData-Formatfori*Models

21. 21
CONCLUSIONS & FUTURE WORK
iStarJSON:ALightweightData-Formatfori*Models

22. 22
iStarJSON:ALightweightData-Formatfori*Models
Conclusions
Definition of JSON
language
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2
3
Release iStarJSON as OSS project
Provision of 3 REST
Web Services
iStarML to iStarJSON converter
iStarJSON Validator
iStarJSON Graph Generator
https://github.com/UPC-gessi-oscar-franco/iStarJson

23. 23
iStarJSON:ALightweightData-Formatfori*Models
i* Model Analysis
Social Network Analysis
Software Ecosystems
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2
3
Future work
Adding more services for…

24. 24
iStarJSON:ALightweightData-Formatfori*Models
?
Thank you!