Feature driven development

@hendrikEbberswww.guigarage.com
Feature Driven Development

default branchAbout me
Hendrik Ebbers @hendrikEbbers
www.guigarage.com
JUG DortmundMastering
JavaFX 8
Controls
DataFX, AquaFX,
Vagrant-Binding

default branchContent
features workflows feature toggles

default branchWhat is a feature?
„play“ button
feature

private single developer project
Ribbon interface
removed
„play“ button added
multi touch
support Hibernate version
changed

structure of a complex application
Backend
Frontend / UI
Persistence

Let’s start with the UI
trunk
button on UI

Diff of the first commit
<form >
<input type="button" value=„play“ onclick=„rpc.play()“>
</form>
class PlayService {
!
public void play() {
throw new RuntimeException(„Not implemented!“);
}
!
}

Commit history
button on UI
JPA classes
new media service
bugfix #235
trunk

Houston, we have a problem
button on UI
JPA classes
new media service
bugfix #235
Application can’t be released!
trunk

Concurrent development = Concurrent problems
Jim
Bob
Martin
John
bugfix 7
new
middleware
rest
services
security
issues

button on UI
JPA classes
new media service
bugfix #235
trunk
Ribbon interface
removed (50%)
Ribbon interface
removed (100%)
testcommit
refactored most
entities

button on UI
JPA classes
new media service
bugfix #235
trunk
Ribbon interface
removed (50%)
Ribbon interface
removed (100%)
testcommit
refactored most
entities
Application can NEVER be released!

Using a feature branch
button on UI
JPA classes
new media service
mergebranch
develop
feature
branch

Release cycle?
Application can be released!

Concurrent development?
feature 1
feature 2

Problem: merge hell
merge hell
f# 1 f# 4 f# 2 f# 3 f# 5
t = 2 month

hidden button
and middleware
backend
visible
button
easy
merge
easy
merge
easy
merge
Solution: Dark launching & small branches

Solution: update the feature branch
merge merge merge
adding button
localization of
button title
final
button icon
!
easy merge /
pull request

Problem: changes creates bugs
bugs?
Point of no return

Solution: Feature Toggles
!
if(MY_FEATURE.isActive( )) {
showPlayButton( );
} activate
feature
the feature
check

Fallback to old implementations
!
if(NEW_PERSISTENCE.isActive( )) {
return jpaCall( );
} else {
return jdbcCall( );
}
old new

Java APIs
JSF
Support
Spring
Support Java EE
Support
Admin
Console
Activation
Strategies
State
Repositories
User
Authentification
Java SE
Support

Java APIs
JavaFX
Support
Observer
pattern
Binding
Supports
predefined
annotations

Define Features as enum
!
@Issue(„JFX-638“)
@EnabledByDefault
NEW_PERSISTENCE,
!
@Issue(„JFX-492“)
@EnabledByDefault
TWITTER_SUPPORT,
. . .
add
metadata to
describe the
feature

Features state and activation
!
MY_FEATURE.isActive( )
always
always on
dev system
next 3 hours
for random
users
stored in db
defined in
property file

Administration view
< >
!
http://www.my-app/administration/togglz

Fronted support
!
<h:panelGroup rendered="#{features['PLAY_FEATURE']}">
<h:commandButton value=„play" />
</h:panelGroup>
@FXML
@HideByFeature("PLAY_FEATURE")
private Button playButton;
JavaFX
JSF

Take care of your features
FEATURE_1,
FEATURE_2,
FEATURE_3,
FEATURE_4,
FEATURE_5,
. . .
FEATURE_1462,
FEATURE_11463,
Where is my
feature???
Don’t forget
to clean up!
(once a feature is
live for a defined
period of time)

Conclusion
button &
feature toggle
backend
remove
feature toggle
use feature
toggles
clean upuse short
living
branches
describe your
features with
metadata
&
provide
feature
administration
&

@YourTwitterHandle#DVXFR14{session hashtag} @hendrikEbberswww.guigarage.com
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&
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Feature driven development

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