remote pair programming buildstuff.lt johannes brodwall exilesoft chief scientist @jhannes guest...
TRANSCRIPT
Remote Pair Programming
BuildStuff.ltJohannes Brodwall
Exilesoft Chief scientist
@jhannesGuest starring:
Dileepa Jayasuriya
How can a distributed team
still collaborateclosely?
How can a team collaborate well?
This talk is for you if you…
You work in a team, but...
Your team doesn’t feel like a team
Your distributed team doesn’t feel like a team
After this talk
Three things to become a super productive team
But first
But first – a competition:
Competition:Find the blue sentence
1. What is a super team2. Building a super team
with pairing3. Getting the benefits4. Summary
Part I
What is a super team?
Sharing the burden
The fun remote team
Rabbit hole!
Shared context
Sharing experience
Whops! No!
Working baseline
“That’s strange…”
“Eureka!”
20 minutes fix (where 10 was
waiting)
Problem solved
The sad team
Planning
The sad team
JohannesJohannes
Backend dev
“Scrum” “Master”
Johannes: You’ll create CRUD SOAP service for projects
with applications
Okay
Planning
The sad team
JohannesJohannes
Backend dev
“Scrum” “Master”
How long will it take?
Um…
Planning
Backend dev 2
The sad team
JohannesJohannes
Backend dev
“Scrum” “Master”
It’s pretty easy with Hibernate
Okay, 8 hours for each of Create…
then
!
Stand-up
The sad team
Designer
Frontend devDatabase dev
Today, I will work on Create Project
JohannesJohannes
Backend dev
Scrum master
Stand-up
The sad team
Designer
Frontend devDatabase dev
No impediments
JohannesJohannes
Backend dev
Scrum master
Behold – the uber coder
The sad team
Exception!
The sad team
org.hibernate.PropertyValueException: not-null property references a null or transient value: ....common.entities.Application._applicationsBackref org.hibernate.engine.Nullability.checkNullability(Nullability.java:95) org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:313) org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:204) org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:130)org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210) org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56) org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195) org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50) org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
The sad team
Exception
Stack overflow
Tweak
Deploy
Poke
The sad team
Exception
Stack overflow
Tweak
Deploy
Poke
The sad team
Exception
Stack overflow
Tweak
Deploy
Poke
The sad team
Exception
Stack overflow
Tweak
Deploy
Poke
Stand-up
The sad team
Designer
Frontend devDatabase dev
Yesterday, I worked on Create Project
JohannesJohannes
Backend dev
Scrum master
Stand-up
The sad team
Today, I will hopefully fix the
exception and also do Delete Project
JohannesJohannesScrum master
Designer
Frontend devDatabase dev
Backend dev
Stand-up
The sad team
No impediments
JohannesJohannesScrum master
Designer
Frontend devDatabase dev
Backend dev
Stand-up
The sad teamJohannesJohannesScrum master
Designer
Frontend devDatabase dev
Backend dev
How could they help anway
The sad team
Behold – the uber coder
The sad team
The sad team
Stand-up
The sad teamJohannesJohannesScrum master
Yesterday, I finally finished Delete after 3 days of «coding»
Designer
Frontend devDatabase dev
Backend dev
I didn’t need the Delete service
Stand-up
The sad teamJohannesJohannesScrum master
Designer
Frontend devDatabase dev
Backend dev
I didn’t need the Delete service
Yesterday, I finally finished Delete after 3 days of «coding»
The sad team
STOP
Imagine you should carry 10 wooden beams
Each is 3 meters and 30 kg
The fun team
Stand-up
The sad team
I’m ready for a new task.What’s on the board..
JohannesJohannes
Johannes
Scrum master
Stand-up
The sad team
«Let’s users administrate their projects»
JohannesJohannes
Johannes
Scrum master
Stand-up
The sad team
I haven’t done any Hibernate tasks before.
Who can I pair with?
JohannesJohannes
Johannes
Scrum master
I can work together with you
Exception!
The sad team
org.hibernate.PropertyValueException: not-null property references a null or transient value: ....common.entities.Application._applicationsBackref org.hibernate.engine.Nullability.checkNullability(Nullability.java:95) org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:313) org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:204) org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:130)org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210) org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56) org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195) org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50) org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
That link doesn’t really seem relevant. Are we getting anywhere?
Time to ask for help?
I think Dileepa has worked on this sort of
thing before
Dileepa
Yeah, just look at the Person HasMany Roles
mapping
That’s it!High five!
The difference
Everyone works everywhere
Knowledge is disseminated
You’re never alone
Part II
Superfyingwith
Pair programming
Pair programming styles
Debate club
“No, this variable should be called fooNumber, not fooNum”,
“But it’s a common abbreviation”
Dedicated driver
“I’ll write the parser”
“I’ll design the algorithm”
Driver-navigator
“I don’t know how to solve this, so I’ll sit at the keyboard”
Ping-pong
Ingredient #1:
Pair programming
Ingredient #2:
Test driven development
Failing test
Write code
Failing test
Write code
Failing test
Ingredient #3:
Refactoring
Failing test
Write code
Failing test
Write code
Failing test
Refactor code and tests
Refactor code and tests
Put together
Failing test
Write code
Failing test
Write code
Failing test
Failing test
Write code
Failing test
Write code
Failing test
Refactor code and tests
Refactor code and tests
Failing test
Write code
Failing test
Write code
Failing test
Refactor code and tests
Refactor code and tests
Demonstration(Guest starring
Dileepa Jayasuriya)
Kata: Number to text
Kata: Number to text8192 => eight thousand one hundred and ninety two
125,017 =>
one hundred and twenty five thousand and seventeen
What does it feel like?
Part III
From here to there
Make sharing into a goal
Dileepa
Johannes
Chintaka
Thomas
Sergey
Arunas
Dileepa
Johannes
Chintaka
Thomas
Sergey
Arunas
Arunas Johannes Dileepa Chinthaka Sergey Thomas
Add new company✓ ✓ ✓ ✓ ✓
Display contacts on map ✓ ✓ ✓
Filter contacts in list✓ ✓
Authenticate user by company ✓ ✓ ✓ ✓
Store password securely ✓ ✓
Usernames with Norwegian letters are rejected
✓
Arunas Johannes Dileepa Chinthaka Sergey Thomas
Add new company✓ ✓ ✓ ✓ ✓
Display contacts on map ✓ ✓ ✓
Filter contacts in list✓ ✓
Authenticate user by company ✓ ✓ ✓ ✓
Store password securely ✓ ✓
Usernames with Norwegian letters are rejected
✓
Arunas Johannes Dileepa Chinthaka Sergey Thomas
Add new company✓ ✓ ✓ ✓ ✓
Display contacts on map ✓ ✓ ✓
Filter contacts in list✓ ✓
Authenticate user by company ✓ ✓ ✓ ✓
Store password securely ✓ ✓
Usernames with Norwegian letters are rejected
✓
Overcoming obstacles
JIRA
With a true team, no member owns more
than their current task
TODO DOING DONE
WAITING
AWAY
You will get more done
(But not in the first or second sprint)
Distance
• Skype (or any voice sharing)• GoToMeeting (or flexible screen
sharing)• Dropbox (or any file sharing)
Skill and tact
• Experiment with switching patterns
• Try out ping-pong• “Could we try it this way
first?”
Building your skills
Fun events
Expect exhaustion
Just do it
• Ask for help• Don’t wait for
• Perfect tool• Perfect oppunity
Conclusion
What
• Two people at one codebase• No member owns a task
beyond the day• Team rotates pairing
Why
• “Rockstar programmer” model doesn’t scale
• Less Overproduction (unused functions in API)• Less Waiting (for the only person who knows X)• Less Motion (as everyone gets more skilled)• Fewer Defects (as two pair of eyes see better)• Less Over-processing (from double responsibility)• Less Inventory (as team works more focused)• Less Transportation (handoffs inside a story)
How
• Ask for help – don’t work alone
• Try ping pong programming for two hours
• Be open, share and listen
Competition:What was the blue sentence?
A team creates together what no member could do
alone
You can start as soon as you get
back to work
http://JohannesBrodwall.comhttp://exilesoft.com
http://twitter.com/jhannes
Thank you