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JavaScript Topic Maps in server environments
JavaScript Topic Maps in server environments
JavaScript Topic Maps in server environments
JavaScript Topic Maps in server environments
JavaScript Topic Maps in server environments
JavaScript Topic Maps in server environments
JavaScript Topic Maps in server environments
JavaScript Topic Maps in server environments
JavaScript Topic Maps in server environments
JavaScript Topic Maps in server environments
JavaScript Topic Maps in server environments
JavaScript Topic Maps in server environments
JavaScript Topic Maps in server environments
JavaScript Topic Maps in server environments
JavaScript Topic Maps in server environments
JavaScript Topic Maps in server environments
JavaScript Topic Maps in server environments
JavaScript Topic Maps in server environments
JavaScript Topic Maps in server environments
JavaScript Topic Maps in server environments
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JavaScript Topic Maps in server environments

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This paper is about the JavaScript-based Topic Maps Engine tmjs.

This paper is about the JavaScript-based Topic Maps Engine tmjs.

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  • 1. W E B V E V E R I E T JavaScript Topic Maps in server environments Jan Schreiber <jans@ravn.no> Ravn Webveveriet AS, 2010-10-01 1
  • 2. Outline • JavaScript • The tmjs Topic Maps engine • Use Case: A PSI Server • Outlook W E B V E V E R I E T 2
  • 3. JavaScript • JavaScript is LISP with a C-like syntax • Virtually every personal computer in the world has at least one JavaScript interpreter installed on it and in active use. W E B V E V E R I E T 3
  • 4. tmjs • A Topic Maps engine • Written in pure JavaScript • Full TMDM including Variants • TMAPI 2.0-based • In-memory backend, JTM import/ export, experimental XTM 2.0 import (requires DOM) W E B V E V E R I E T 4
  • 5. tmjs • Platform independent: All(iPhone & browsers, mobile devices modern Android), server-side JavaScript • Unit tests, CXTM tests (partly) & JSLint validating • Small changes to TMAPI due to the lack of method overloading • Syntactic sugar: Supports chaining of TMAPI calls W E B V E V E R I E T 5
  • 6. Chaining 1 tm.createTopic().addSubjectIdentifier(foo). 2 createName('bar').getParent(). 3 createOccurrence(type,'baz'). 4 addScopingTopic(quux); W E B V E V E R I E T 6
  • 7. tmjs: Outlook • More import/export formats: XTM 2.0, CTM • Complete TMAPI, add more tests, full CXTM • Persistence: • Web SQL Database backend • Persistent backend for Node (couchdb?) • Later: Query language W E B V E V E R I E T 7
  • 8. Use Case: A PSI Server • Idea: Start the server with a Topic Map and it will serve information about all Subject Identifiers for a given domain W E B V E V E R I E T 8
  • 9. • Screenshot node-psi-server W E B V E V E R I E T 9
  • 10. Server-side JavaScript • 1996: Netscape releases LiveWire as part of Netscape Enterprise Server 2.0 • 2009: Ryan Dahl writes Node W E B V E V E R I E T 10
  • 11. Node • A framework for low-level network applications based on Google's V8 engine • TCP, DNS and HTTP are first-class protocols • Event-based, asynchronous programming • All I/O is non-blocking W E B V E V E R I E T 11
  • 12. result = db_query(db, "SELECT * FROM topic"); W E B V E V E R I E T 12
  • 13. db_query(db, "SELECT * FROM topic", callback); W E B V E V E R I E T 13
  • 14. db_query(db, "SELECT * FROM topic", callback); callback = function (err, result) { // ... } W E B V E V E R I E T 14
  • 15. 1 var tm, servername; 2 // assumes that the TopicMap object tm has been initialized and 3 // the topic map in question has been imported successfuly. 4 // servername is set from a command line parameter 5 http.createServer(function (req, res) { 6 var url = 'http://'+servername+req.url, loc, topic; 7 loc = tm.createLocator(url); 8 topic = tm.getTopicBySubjectIdentifier(loc); 9 if (topic) { 10 res.writeHead(200, {'Content-Type': 'text/html'}); 11 // create a page with information about the PSI 12 } else { 13 // Not found: create a 404 response 14 } 15 res.close(); 16 }).listen(80); W E B V E V E R I E T 15
  • 16. Use Case: A PSI Server • More output formats: XHTML, JTM, XTM • Support for logging, caching, templates • Configurable list of information elements that are included on generated pages (e.g. dc:description, supertype-subtype) • PSI black-listing • subj3ct.com integration W E B V E V E R I E T 16
  • 17. PSI Server: Observations • Easy to implement • It’s really fast: 200+200ms to read the Opera topic map, 1ms to serve a PSI page • tmjs can be used on server and client side Reuse of application code W E B V E V E R I E T 17
  • 18. Summary & Outlook • Server side Topic Maps with JavaScript: possible! • Asynchronous TMAPI? • In its current state maybe best suited for low-level applications W E B V E V E R I E T 18
  • 19. What could it be good for? • TMRAP, TM REST API • SDshare • P2P applications • DNS servers W E B V E V E R I E T 19
  • 20. Questions? Download tmjs now! http://github.com/jansc/tmjs Coming soon: http://github.com/jansc/node-psi-server W E B V E V E R I E T 20

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