SASAbus HTML5 app overview

SASAbus HTML5 & related Java free software
by Davide Montesin <d@vide.bz>

(C) 2013 Davide Montesin <d@vide.bz> - License: CC BY NC ND

SASAbus HTML5 & related Java free software - TIS innovation park South Tyrol

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The project

Name: SASAbus HTML5
Url: http://html5.sasabus.org
License: Aﬀero GPL
Source code: https://github.com/davidebz
Programming languages: Java, HTML5, CSS3
Developing time: 3 months (summer 2013)
Frontend: 7'000 lines of code
Backend: 4'000 lines of code



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SASA open data

http://opensasa.info
License: CC-3.0-BY-SA-NC



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Team
SASAbus community: community@sasabus.org. Join us!

Davide Montesin - SASAbus HTML5/Java developer
Markus Windegger - SASA database & Android app
Giulia Rosso - design
Iryna Dorosh - design
Virginia Mazzocco - design



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Motivation: an android app is not enough
Before this project only an Android app existed for SASA open data



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Goal: an app for everybody
We wanted to reach more citizens and tourists



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Native or HTML5

Which way: native or HTML5?


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Native: powerful but expensive

High integration with the phone
Each platform needs a new development process and programming
language skills: Java, Objective-C, a Mac ...
Code reuse is diﬃcult: approximately the costs are: app * platform
Each platform has its own look & feel: can't be a simple one-to-one
copy


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HTML5: easier
Runs anywhere there is a HTML5 capable browser: smartphones,
tables, pc
One development process/team
Common web skills are enough: HTML5, CSS3, Javascript + a server
side language

Limited integration with the phone ... but ... (see next slides)


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HTML5 & geolocation
An HTML5 app may knows the position of the user

navigator.geolocation.getCurrentPosition(on_position_ready);



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HTML5 & CSS3
An HTML5 app can be responsive using CSS3 media query

@media only screen and (min-width: 940px) { ... }



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HTML5 & localstore / oﬄine
An HTML5 app can work oﬄine and store data in the browser

Space is limited: about 5Mbyte.
(remember that 1 Javascript char uses 2 bytes)


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HTML5: caniuse
As for traditional web projects, ﬁrst check cross browser support

http://caniuse.com


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We choose HTML5
HTML5 features are adequate in this case



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Menu

The implemented functions



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Responsive
Two ﬂuid layout based on browser width: small (<940px) & big (>=940px)



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Easy: lines, bus stops with precalculated departures
Each bus stop shows precalculated departures based on date / time!



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Easy: favourites, news, route calculations
The app can calculate the best route between two bus stops



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Map: geolocalization, bus stops, lines, ...



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Parking: real-time free slots



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A look under the hood
Which technologies have been used?



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Overview of the actual system



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Classic or innovative technologies?

Follow a classic or an innovative way?



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Classic architecture: HTML, JS, D-HTML
A UI component is realized with diﬀerent technologies / skills :-(



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Web frameworks
Ways to reduce complexity and fragmentation
Server side framework
The code executes server side. Often and additional client
framework is required for events handling and ajax
The code executes server side. Framework sends incremental
updates to the client
Client side frameworks: jquery, yui, ecc..
page can't be indexed by search engines
Use the same programming language on both sides
Javascript: with some libraries it is possible to run Javascript code
server side too
Java: can be converted to Javascript with GWT



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We decided to use Java on both sides



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The power of UI inherintance and composition

Java UI components/object in the SASAbus HTML5 app


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GWT - http://www.gwtproject.org



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How does GWT works?
GWT translates Java code into the equivalent Javascript code



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GWT: client, server, shared and serialization

In a GWT project Java objects can run
server only: this code will run only server side: i.e. servlets
client only: this code will run only client side: i.e. Window, Location
shared: this code can run both server or client side
this data objects can be serialized and transmitted over the
network from one side to the other (i.e. bus stops)



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GWT limitations

Unfortunately GWT UI stock objects don't run server side (even if
with GWT it is possible to exchange shared objects)
GWT app can't be indexed by search engines

GWT uses a proprietary protocol to exchange Java objects between
server and browser



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DM libraries: DMWeb
I have created a library of UI widget to resolve the GWT limitations
about server side UI

DMWeb: UI components run BOTH server and client side and
provide HTML for SEO!
License: LGPL v3
Source code: http://github.com/davidebz
Infos: http://www.davide.bz



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SEO: With DMWeb HTML5 app are indexed



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DM libraries: DMXmlJson
I have created a framework which converts/serializes java objects to
Xml or Json. This framework is compatible with GWT, J2SE and Android

License: LGPL v3
Source code: http://github.com/davidebz
Infos: http://www.davide.bz



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Future steps!
Integration of the services



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Workshop afternoon at 15.00
USING the app: how to use the app, examples of searching for
departures, routing and map
DEVELOPER: Let's install the development software and play with
it!
install the development environment as VirtualBox VM
query the sasa open data database: list of lines, bus stops, and so
on...
convert Java objects to xml and json with dm-xml-json library
create a small HTML5 web app with server and client side code
using GWT + DMWeb
run the SASAbus HTML5 project in development mode
analyse the SASAbus HTML5 project
make some changes to the project, i.e. ﬁx some translations, add
train stations, ...
Workshop will be held in italian


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Thank you!



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SASAbus HTML5 app overview

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