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EWD.js: The Future Starts Here
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EWD.js: The Future Starts Here
1.
Copyright © 2015
M/Gateway Developments Ltd EWD.js The Future Starts Here Rob Tweed Twitter: @rtweed rob.tweed@gmail.com http://www.mgateway.com 1Wednesday, 25 March 15
2.
Copyright © 2015
M/Gateway Developments Ltd How EWD.js tends to be viewed • Just one of many possible technical options • Tomorrow will bring another shiny technology • Rob's hobby horse 2Wednesday, 25 March 15
3.
Copyright © 2015
M/Gateway Developments Ltd What if… • EWD.js was adopted at the VA? • What's the view like from up there? 3Wednesday, 25 March 15
4.
Copyright © 2015
M/Gateway Developments Ltd EWD.js: the bigger picture • What does it make possible? • A glimpse of the vision behind EWD.js 4Wednesday, 25 March 15
5.
Copyright © 2015
M/Gateway Developments Ltd What is EWD.js • Development framework • Run-time platform http://ewdjs.com 5Wednesday, 25 March 15
6.
Copyright © 2015
M/Gateway Developments Ltd What is EWD.js • Development framework – Client-server applications in the browser – Web Services – Legacy Mumps application modernisation • Run-time platform 6Wednesday, 25 March 15
7.
Copyright © 2015
M/Gateway Developments Ltd What is EWD.js • Development framework • Run-time platform – Node.js-based application server – Web Server – Integrated JSON database • Caché, GT.M, GlobalsDB, MongoDB 7Wednesday, 25 March 15
8.
Copyright © 2015
M/Gateway Developments Ltd EWD.js key features • 100% JavaScript – Browser – Back-end (business logic): Node.js • 100% JSON-based data – Browser – Back-end – Database • Legacy Mumps code can be accessed from Node.js • High performance – Node.js – In-process interface to database • Highly scalable – stateless 8Wednesday, 25 March 15
9.
Copyright © 2015
M/Gateway Developments Ltd Current VistA VistA Caché VistA Server Roll & Scroll RPC BrokerCPRS RPCsFileMan Stateful 9Wednesday, 25 March 15
10.
Copyright © 2015
M/Gateway Developments Ltd EWD.js-enabled VistA EWD.js VistA Caché Node.js VistA Server cache.node Roll & Scroll RPC BrokerCPRS RPCsFileMan Interface functions Web Service Clients HTTPS + HMAC SHA256 Stateful JavaScript /Node.js business logic Stateless 10Wednesday, 25 March 15
11.
Copyright © 2015
M/Gateway Developments Ltd VistA Cache EWD.js Application Server Cache nginx EWD.js Application Server Cache EWD.js Application Server Cache ECP Networking Mapped globals for shared EWD Sessions & VistA data Mapped VistA routines Incoming WebService Traffic Scaling Out 11Wednesday, 25 March 15
12.
Copyright © 2015
M/Gateway Developments Ltd Benefits to the VA • Single language skill • Controlled migration: – from rare Mumps development resources – To readily-available JavaScript developers 12Wednesday, 25 March 15
13.
Copyright © 2015
M/Gateway Developments Ltd Benefits to the VA • Single language skill • Controlled migration: – from rare Mumps development resources – To readily-available JavaScript developers – One-off interfacing of core VistA functionality via JavaScript functions 13Wednesday, 25 March 15
14.
Copyright © 2015
M/Gateway Developments Ltd Federated access across the VA? 14Wednesday, 25 March 15
15.
Copyright © 2015
M/Gateway Developments Ltd ewd-federator Cache / GlobalsDB / GT.M persistent JSON cacheing, storage Node.jsREST Clients REST Requests EWD.js system HTTP-based Web Service REST-based Service Back-end Servers HTTP REST HM AC-SHA256 Signed HTTP https://github.com/robtweed/ewd-federator 15Wednesday, 25 March 15
16.
Copyright © 2015
M/Gateway Developments Ltd ewd-federator Cache / GlobalsDB / GT.M persistent JSON cacheing, storage Node.jsREST Clients REST Requests EWD.js system Back-end Servers EWD.js system EWD.js system EWD.js system 16Wednesday, 25 March 15
17.
Copyright © 2015
M/Gateway Developments Ltd ewd-federator Cache / GlobalsDB / GT.M persistent JSON cacheing, storage Node.jsREST Clients REST Requests EWD.js system Back-end Servers EWD.js system EWD.js system EWD.js system 17Wednesday, 25 March 15
18.
Copyright © 2015
M/Gateway Developments Ltd ewd-federator Cache / GlobalsDB / GT.M persistent JSON cacheing, storage Node.jsREST Clients REST Requests EWD.js system Back-end Servers EWD.js system EWD.js system EWD.js system 18Wednesday, 25 March 15
19.
Copyright © 2015
M/Gateway Developments Ltd ewd-federator Cache / GlobalsDB / GT.M persistent JSON cacheing, storage Node.jsREST Clients REST Requests EWD.js system Back-end Servers EWD.js system EWD.js system EWD.js system Aggregate responses 19Wednesday, 25 March 15
20.
Copyright © 2015
M/Gateway Developments Ltd ewd-federator Cache / GlobalsDB / GT.M persistent JSON cacheing, storage Node.jsREST Clients REST Requests EWD.js system Back-end Servers EWD.js system EWD.js system EWD.js system Aggregate responses 20Wednesday, 25 March 15
21.
Copyright © 2015
M/Gateway Developments Ltd ewd-federator Cache / GlobalsDB / GT.M persistent JSON cacheing, storage Node.jsREST Clients REST Requests EWD.js system Back-end Servers EWD.js system EWD.js system EWD.js system Intercept Incoming request 21Wednesday, 25 March 15
22.
Copyright © 2015
M/Gateway Developments Ltd ewd-federator Cache / GlobalsDB / GT.M persistent JSON cacheing, storage Node.jsREST Clients REST Requests EWD.js system Back-end Servers EWD.js system EWD.js system EWD.js system re-directIntercept Incoming request 22Wednesday, 25 March 15
23.
Copyright © 2015
M/Gateway Developments Ltd ewd-federator Cache / GlobalsDB / GT.M persistent JSON cacheing, storage Node.jsREST Clients REST Requests EWD.js system Back-end Servers EWD.js system EWD.js system EWD.js system Intercept Incoming response 23Wednesday, 25 March 15
24.
Copyright © 2015
M/Gateway Developments Ltd ewd-federator Cache / GlobalsDB / GT.M persistent JSON cacheing, storage Node.jsREST Clients REST Requests EWD.js system Back-end Servers EWD.js system EWD.js system EWD.js system Intercept Incoming response re-direct 24Wednesday, 25 March 15
25.
Copyright © 2015
M/Gateway Developments Ltd ewd-federator Cache / GlobalsDB / GT.M persistent JSON cacheing, storage Node.jsREST Clients REST Requests EWD.js system Back-end Servers EWD.js system EWD.js system EWD.js system Aggregate responses 25Wednesday, 25 March 15
26.
Copyright © 2015
M/Gateway Developments Ltd ewd-federator Cache / GlobalsDB / GT.M persistent JSON cacheing, storage Node.jsREST Clients REST Requests EWD.js system Back-end Servers EWD.js system EWD.js system EWD.js system Aggregate responses 26Wednesday, 25 March 15
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M/Gateway Developments Ltd ewd-federator • Ability to create complex "dances" between EWD.js and other Web/REST servers – Single Sign On – BSE rules • Ability to save information on ewd- federator – Caching to avoid repeated "dances" – Storing authorisation tokens 27Wednesday, 25 March 15
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M/Gateway Developments Ltd Potential benefits to the VA • Open source, lightweight, JavaScript- based solution to federation • Very fast, scalable – Same ECP-based scale-out could be used • Secure: – EWD.js web service traffic encrypted using HMAC-SHA256 (cf Amazon Web Services) – EWD.js web services inaccessible without authorisation at each EWD.js server 28Wednesday, 25 March 15
29.
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M/Gateway Developments Ltd So that's REST… What about browser-based apps? 29Wednesday, 25 March 15
30.
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M/Gateway Developments Ltd ewd-federator EWD.js Application Server EWD.js VistA EWD.js VistA Site 1 Site 2 EWD.js VistA Site 3 REST Browser WebSockets HTTP Web Services 30Wednesday, 25 March 15
31.
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M/Gateway Developments Ltd EWD.js Browser Applications • Single Page Applications • Use Web Sockets instead of Ajax / HTTP – Bi-directional persistent connection • Server or browser can send at any time • No more polling – Many studies suggest faster than HTTP • Client-server in a browser • Works with any JavaScript framework 31Wednesday, 25 March 15
32.
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M/Gateway Developments Ltd All good stuff, but It's the narrow perspective on why EWD.js 32Wednesday, 25 March 15
33.
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M/Gateway Developments Ltd 33Wednesday, 25 March 15
34.
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M/Gateway Developments Ltd 34Wednesday, 25 March 15
35.
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M/Gateway Developments Ltd JavaScript Brendan Eich Netscape 1995 35Wednesday, 25 March 15
36.
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M/Gateway Developments Ltd JavaScript credibility raised 36Wednesday, 25 March 15
37.
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M/Gateway Developments Ltd Browsers JavaScript Node.js 37Wednesday, 25 March 15
38.
Copyright © 2015
M/Gateway Developments Ltd Browsers JavaScript Node.js There's never been a more exciting time to be in IT And all the big innovations and developments are focused In these 3 areas 38Wednesday, 25 March 15
39.
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M/Gateway Developments Ltd Node.js: There's a module for everything! Tap into a huge and growing pool of innovations 39Wednesday, 25 March 15
40.
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M/Gateway Developments Ltd So, browser-based VistA Apps The right way to go? 40Wednesday, 25 March 15
41.
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M/Gateway Developments Ltd • Myth #1: Browser UIs just aren't good enough for clinical/medical apps • Myth #2: Browsers and web technologies aren't fast enough / too much latency • Myth #3: Browsers and web technologies aren't secure enough 41Wednesday, 25 March 15
42.
Copyright © 2015
M/Gateway Developments Ltd •Myth #1: Browser UIs just aren't good enough for clinical/medical apps It seems they're good enough for everyone else There's nothing a browser can't do these days The days of being limited to simple pages were decades ago 42Wednesday, 25 March 15
43.
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M/Gateway Developments Ltd •Myth #1: Browser UIs just aren't good enough for clinical/medical apps Do you use: • Google Docs • Microsoft Office 365 • Do you bank, shop, watch videos, etc on your browser at home? 43Wednesday, 25 March 15
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M/Gateway Developments Ltd •Myth #1: Browser UIs just aren't good enough for clinical/medical apps 44Wednesday, 25 March 15
45.
Copyright © 2015
M/Gateway Developments Ltd •Myth #1: Browser UIs just aren't good enough for clinical/medical apps • Sophisticated graphics: • 2-d • 3-d eg http://data-arts.appspot.com/globe/ 45Wednesday, 25 March 15
46.
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M/Gateway Developments Ltd •Myth #1: Browser UIs just aren't good enough for clinical/medical apps http://gradvs1.mgateway.com/main/simon3d.html 46Wednesday, 25 March 15
47.
Copyright © 2015
M/Gateway Developments Ltd •Myth #1: Browser UIs just aren't good enough for clinical/medical apps Finally, see the work of Astute Semantics VistA modernisation using EWD.js http://astutesemantics.com/ 47Wednesday, 25 March 15
48.
Copyright © 2015
M/Gateway Developments Ltd •Myth #1: Browser UIs just aren't good enough for clinical/medical apps 48Wednesday, 25 March 15
49.
Copyright © 2015
M/Gateway Developments Ltd •Myth #2: Browsers and web technologies aren't fast enough / too much latency Are the following hopelessly slow for you? • Amazon • EBay • Google • Do you watch Netflix or YouTube in your browser? 49Wednesday, 25 March 15
50.
Copyright © 2015
M/Gateway Developments Ltd •Myth #2: Browsers and web technologies aren't fast enough / too much latency Demonstrations showing federated access to multiple VistA systems using ewd-federator and EWD.js: !Sub-second response Asynchronous pre-emptive data fetching based on usage statistics 50Wednesday, 25 March 15
51.
Copyright © 2015
M/Gateway Developments Ltd •Myth #2: Browsers and web technologies aren't fast enough / too much latency 51Wednesday, 25 March 15
52.
Copyright © 2015
M/Gateway Developments Ltd •Myth #3: Browsers and web technologies aren't secure enough It seems they're good enough for online banking…. 52Wednesday, 25 March 15
53.
Copyright © 2015
M/Gateway Developments Ltd •Myth #3: Browsers and web technologies aren't secure enough 53Wednesday, 25 March 15
54.
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M/Gateway Developments Ltd So what's the view like from up there? 54Wednesday, 25 March 15
55.
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M/Gateway Developments Ltd The future is browser-shaped • Web-sockets – Server can send messages to the browser at any time: • Alerts, message of the day – Real-time graphing of clinical results on tablet browser by the bed-side – Real-time bed state display – Cross-browser inter-communication between provider and patient – Legacy green screen terminal in browser • https://robtweed.wordpress.com/2014/03/04/vista-the-hackable-open-source-ehr-hackable-platform/ 55Wednesday, 25 March 15
56.
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M/Gateway Developments Ltd The future is browser-shaped • WebRTC – Real time communications – Skype-like behaviour in a browser, without plug-ins • Video • Audio • File transfer – Key to browser-based telemedicine 56Wednesday, 25 March 15
57.
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M/Gateway Developments Ltd Asm.js • Subset of JavaScript that can be compiled and run at near native C++ speed in asm.js-enabled browsers • Emscripten compiler • Being driven by the games industry – Unreal Engine ported to run in browser, without plug- ins – Try this: • http://www.flohofwoe.net/demos/dsomapviewer_asmjs.html 57Wednesday, 25 March 15
58.
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M/Gateway Developments Ltd Asm.js • Application of gaming thinking to healthcare problems • High performance UIs with extremely rapid user interaction • Gaming is all about high-speed reaction to highly optimised visualisations of large amounts of data – Sound familiar? 58Wednesday, 25 March 15
59.
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M/Gateway Developments Ltd The future is browser-shaped • ServiceWorkers: – New upcoming feature for the web platform – Designed particularly for offline browser problem – HTML5 AppCache is declarative and has many known limitations – ServiceWorkers: • Allow a script to persistently cache resources • Can handle all resource requests • Even when network unavailable – See: https://github.com/slightlyoff/ServiceWorker/blob/master/ explainer.md 59Wednesday, 25 March 15
60.
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M/Gateway Developments Ltd The future is browser-shaped Chromecast • $35 Device from Google • Marketed as a video streaming device for your TV • It actually has a lot more potential, particularly in healthcare 60Wednesday, 25 March 15
61.
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M/Gateway Developments Ltd Chromecast Schematic Chrome Browser Chrome OS HDMIOutput TV Monitor Projector WirelessNetwork Interface 61Wednesday, 25 March 15
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M/Gateway Developments Ltd The future is browser-shaped Chromecast • Turns an HDMI- interfaced monitor or TV into a sophisticated, controllable display https://robtweed.wordpress.com/2014/04/05/chromecast-understanding-its-potential/ 62Wednesday, 25 March 15
63.
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M/Gateway Developments Ltd VistA Chromecast Applications Chromecast PC or Mac Chrome Chromecast JavaScript APIs Sender Application WirelessNetwork Chrome HTML Page Chromecast JavaScript APIs EWD.js Application EWD.js Application JavaScript EWD.js / Node.js Server EWD.js JavaScript WebSocket messaging VistA 63Wednesday, 25 March 15
64.
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M/Gateway Developments Ltd The future is JavaScript-based Costs $80 64Wednesday, 25 March 15
65.
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M/Gateway Developments Ltd What does it do? Detects hand movements and gestures in 3D area above and around the device 65Wednesday, 25 March 15
66.
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M/Gateway Developments Ltd How do you use it? • USB Device • Move one or more hands above it • Software can detect: – Palms – Fingers & thumbs • Including joints – Position – Rotation in 3D • Samples at whatever frequency you wish • Sub-millimeter accuracy • Program in JavaScript http://osehra.org/sites/default/files/QuantitativeHandTremorTweed.pdf 66Wednesday, 25 March 15
67.
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M/Gateway Developments Ltd The future is JavaScript-shaped 67Wednesday, 25 March 15
68.
Copyright © 2015
M/Gateway Developments Ltd The future is JavaScript-based Google Authenticator for 2-factor authentication EWD.js provides support "out of the box" More info: http://bit.ly/1ERPXRf Video: http://gradvs1.mgateway.com/main/authenticator.html 68Wednesday, 25 March 15
69.
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M/Gateway Developments Ltd Consequences for the VA • Applications move to browser using stateless EWD.js architecture • Resource-hungry stateful applications diminish • Resources freed up on VistA servers 69Wednesday, 25 March 15
70.
Copyright © 2015
M/Gateway Developments Ltd Consequences for the VA • Convergence of mobile & desktop development: – Responsive design – Build once, run on all platforms – One language skill: JavaScript • All but the most demanding mobile applications can be browser-based • ServiceWorkers seen as solution for offline 70Wednesday, 25 March 15
71.
Copyright © 2015
M/Gateway Developments Ltd Consequences for the VA • VistA access moves to browser • Why are PCs needed any more? • Chromebooks would support all applications – Including roll & scroll • Cheap: $200 - 300 • Highly secure • No risk if stolen • No need for such costly and complex security procedures • https://robtweed.wordpress.com/2013/12/19/chromebooks-the-ideal-healthcare-desktop/ 71Wednesday, 25 March 15
72.
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M/Gateway Developments Ltd Consequences for the VA • ewd-federator: – Code distribution – Software update management – Synchronising configurations – Federated control over user privileges – Centralised performance monitoring / dashboards 72Wednesday, 25 March 15
73.
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M/Gateway Developments Ltd I could go on…. 73Wednesday, 25 March 15
74.
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M/Gateway Developments Ltd So imagine if… EWD.js was adopted at the VA.. 74Wednesday, 25 March 15
75.
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M/Gateway Developments Ltd You really should see the view up here! Client-server browser-based applications able to exploit all the IT industry's major advances Browsers, JavaScript & Node.js: the powerhouses of innovation 75Wednesday, 25 March 15
76.
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M/Gateway Developments Ltd 76Wednesday, 25 March 15
77.
Copyright © 2015
M/Gateway Developments Ltd EWD.js The Future Starts Here Rob Tweed Twitter: @rtweed rob.tweed@gmail.com http://www.mgateway.com 77Wednesday, 25 March 15
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