Remote Pair Programming (Agile India)

Remote Pair
Programming
Agile India 2014
Johannes Brodwall
Exilesoft Chief scientist
@jhannes

How can a distributed team
still collaborate

closely?

team
collaborate well?
How can a

Competition:
Find the blue sentence

This talk is a talk
for you if you…

Your team doesn’t
feel like a team

Your distributed team doesn’t
feel like a team

Be motivated to start using pair
programming, possibly remotely

Have seen remote pair
programming

Who is using pair
programming as their
preferred approach?

1. What is a super team
2. Building a super
team with pairing
3. Getting the benefits
4. Summary

20 minutes fix
(where 10 was
waiting)

Planning
Johannes: You’ll
create CRUD SOAP
service for projects
with applications
Okay
Backend dev

“Scrum”
Johannes
“Master”

Planning
How long will it take?

Um…
Backend dev

“Scrum”
Johannes
“Master”

Planning
Backend dev
2

Backend dev

“Scrum”
Johannes
“Master”

It’s pretty
easy with
Hibernate

Okay, 8 hours for
each of Create…
then

!

Stand-up
Today, I will work on
Create Project

Backend dev

Database dev

Scrum master
Johannes

Designer

Frontend dev

Stand-up

No impediments
Backend dev

Database dev

Scrum master
Johannes

Designer

Frontend dev

Exception!
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(DefaultSaveOrUpdateEvent
Listener.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)

Exception
Poke

Google

Deploy

Stack
overflow
Tweak

Stand-up
Yesterday, I worked
on Create Project

Backend dev

Database dev

Scrum master
Johannes

Designer

Frontend dev

Stand-up
Today, I will
hopefully fix the
exception and also
do Delete Project
Backend dev

Database dev

Scrum master
Johannes

Designer

Frontend dev

Stand-up
How could
they help
anyway

Backend dev

Database dev

Scrum master
Johannes

Designer

Frontend dev

Exception!
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is
org.hibernate.ObjectDeletedException: deleted object would be re-saved by cascade (remove deleted object from
associations): [Person[id=22]]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:927)
at org.springframework.web.servlet.FrameworkServlet.doDelete(FrameworkServlet.java:844)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:653)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:796)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at
org.springframework.orm.hibernate4.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:152)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
at org.springframework.web.multipart.support.MultipartFilter.doFilterInternal(MultipartFilter.java:119)
at filter.NoCacheFilter.doFilter(NoCacheFilter.java:102)

Stand-up
Yesterday, I finally
finished Delete after
3 days of «coding»

I didn’t need the
Delete service

Backend dev

Database dev

Scrum master
Johannes

Designer

Frontend dev

Imagine you should carry
10 pieces of timber
Each is 3 meters and 30
kg

Stand-up
I’m ready for a new task.
What’s on the board..

Johannes

Scrum master
Johannes

Stand-up

«Let’s users administrate
their projects»
Johannes

Scrum master
Johannes

Stand-up

I haven’t done any
Hibernate tasks before.
Who can I pair with?

Scrum master
Johannes

Johannes

I can work together
with you

That link doesn’t really
seem relevant.

Are we getting anywhere?
Time to ask for help?

I think Niluka has worked
on this sort of thing before

Yeah, just look at the
Person HasMany Roles
mapping

Niluka

Everyone works everywhere
Knowledge is disseminated
You’re never alone

Superfying
with
Pair programming

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”

Ingredient #1:
Pair programming

Ingredient #2:
Test driven
development

Failing test
Write code

Failing test
Write code
Failing test

Failing test
Write code
Refactor code
and tests
Failing test
Write code
Refactor code
and tests
Failing test

Failing test
Write code
Failing test
Write code

Failing test

Failing test
Write code
Refactor code
and tests

Failing test
Write code
Refactor code
and tests
Failing test

Demonstration
(Guest starring
Niruka Ruhunage)

Kata: Number to text
8192 => eight thousand one hundred and ninety two
125,017 =>
one hundred and twenty five thousand and seventeen

Johannes

Thomas
Chintaka

Arunas
Dileepa
Sergey

Arunas

Add new company

✓

Display contacts on
map

✓

Dileepa

✓

Chinthaka

✓

Store password
securely

✓

✓

✓

Authenticate user by
company

Sergey

✓

✓

Filter contacts in list

Usernames with
Norwegian letters are
rejected

Johannes

Thomas

✓

✓
✓

✓

✓

✓
✓

✓

With a true team, no
member owns more
than their current task

TODO

DOING

WAITING

AWAY

DONE

You will get more done
(But not in the first or
second sprint)

•
•
•

See each other
Share what we see
Share our work

•
•
•

Skype (or any voice sharing)
GoToMeeting (or flexible screen
sharing)
Dropbox (or any file sharing)

• Experiment with switching
patterns
• Try out ping-pong
• “Could we try it this way
first?”

1.
2.
3.
4.

Create a dropbox account
Share a folder with a friend
Put a coding project there
Create a screen share
session
5. Call up your friend

Don’t wait to find
the perfect tool

•
•
•

Two people at one codebase
No member owns a task
beyond the day
Team rotates pairing

•
•
•
•
•
•
•

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)

•

•
•

Ask for help – don’t work
alone
Play with 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

Next week: Commit
to two hours of
working together

Thank you
jbr@exilesoft.com
nru@exilesoft.com

http://JohannesBrodwall.com
http://exilesoft.com
http://twitter.com/jhannes

Remote Pair Programming (Agile India)

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