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BEST DEVELOPMENT PRACTICES FOR GWT WEB APPLICATIONSJULIEN DRAMAIX
GWT.create 2015
Julien DramaixSoftware Engineer
at Arcbees
+JulienDramaix@jDramaix
MOTIVATIONS
GWT BEST PRACTICES
AVOID WIDGETSAS MUCH AS YOU CAN
BEST PRACTICE 1
WIDGETSARE HEAVY.
BECAUSE
TAKE CONTROL OF YOUR HTML!
Full Event Mechanism
AVOID WIDGETS AS MUCH AS YOU CAN
Even if you don’t need it
AVOID WIDGETS AS MUCH AS YOU CAN
Full Event Mechanism
How to attachevent handlerto elements ?
AVOID WIDGETS AS MUCH AS YOU CAN
Maybe add gwtquery examples
“Speed up your GWT coding with gQuery” by Manuel Carrasco Moñino.
-Tomorrow 10:00 Room 3
When touse widgets
To encapsulate complex component to reuse
» Prefer PresenterWidget if the component has a lot of business logic.
» In the future: Web Components.
AVOID WIDGETS AS MUCH AS YOU CAN
Cell widgets (CellTable, CellList…)
HtmlPanel
AVOID WIDGETS AS MUCH AS YOU CAN
Exceptions
EMBRACE BROWSER HISTORY
BEST PRACTICE 2
Let the usersuse the back button !
EMBRACE BROWSER HISTORY
Let the usersrefresh the page !
EMBRACE BROWSER HISTORY
The url token should contains enough information to determine the state of the app
EMBRACE BROWSER HISTORY
Implement thatat the beginning.
EMBRACE BROWSER HISTORY
USE ANEVENT BUS
BEST PRACTICE 3
Fight spaghetti code !
USE AN EVENT BUS
Alwaysbe decoupling
USE DEPENDENCY INJECTION
BEST PRACTICE 4
USEMVP PATTERN
BEST PRACTICE 5
USE MVP PATTERN
MODEL
PRESENTER
VIEW
USE MVP PATTERN
Your presenters will contain your business logic
USE MVP PATTERN
Your presenters don’t know anything about DOM elements and widgets
USE MVP PATTERN
Your views must be as dumb as possible
Embracebest practices
GWTP
A lot of interesting features
➔ Presenter Lifecycle➔ Presenter Widget➔ Nested Presenter➔ Popup Presenter➔ URL Parameters➔ Route-Place-Tokens➔ Navigation Confirmation➔ Presenter Gatekeeper➔ REST-dispatch➔ RPC-dispatch
GWTP
“How to improve your productivity using GWTP” by Christian Goudreau.
-Tomorrow 10:00 Room 2
USE CSS AS MUCH AS YOU CAN
BEST PRACTICE 6
Use CssResource with GSS.
USE CSS AS MUCH AS YOU CAN
Prefer gss files overUiBinder inline style.
USE CSS AS MUCH AS YOU CAN
Keep your CSSclean.
USE CSS AS MUCH AS YOU CAN
Remove unused styles.
LOAD EVERYTHING YOU CAN IN THE HTMLPAGE
BEST PRACTICE 6
Inject static datain javascript arraysin your html page
LOAD EVERYTHING YOU CAN
Use Dictionnaryto read them
LOAD EVERYTHING YOU CAN
Minimize the number of requestsneeded to load the app
LOAD EVERYTHING YOU CAN
UNIT TESTS
MVP and Dependency injectionTests are now easy to write
UNIT TESTS
Test each protected and publicmethods of your presenters
UNIT TESTS
CODE REVIEWS
IMPROVEQUALITYOF YOUR CODE
CODE REVIEWS
DETECT BUGSEARLIER
CODE REVIEWS
A WAY TO LEARNFROMYOUR PEERS
CODE REVIEWS
WEB BASED CODE REVIEWSYSTEM
CODE REVIEWS
GITHUB STASH BITBUCKET GERRIT
CODE REVIEWSBEST PRACTICES
CODE REVIEWS
TAKE CONTROL OF YOUR HTML!USE A STYLE GUIDE !
Address all commentsbefore merging
CODE REVIEW BEST PRACTICE
CONTINUOUSINTEGRATION
THE FIRST PERSON TODO CODE REVIEWIS YOUR CI SERVER
CONTINUOUS INTEGRATION
ENFORCE STYLE GUIDE WITHCHECKSTYLE
CONTINUOUS INTEGRATION
DEVELOPMENTPROCESS
Designer
Web Integrators
Developpers
SUCCESS
THANK YOU
THANK YOU
please rate this presentation at gwtcreate.com/agenda
Julien DramaixSoftware Engineer
at Arcbees
+JulienDramaix@jDramaix
QUESTIONS ?
