The Path to Continuous Delivery

The Path to Continuous
Delivery

Pedro Pimentel
”zukunftsalick”  
in most social apps

Continuous Delivery
to the Pub

1
I'll send an email to everyone asking who wants
to go to the pub after work.

1
2
I’m in.

1
5 6
4
32
I’m in.

1
5 6
4
32
I’m in.
7
I just need to ﬁnish a few things off.
Can you wait 5 minutes?

1
5 6
4
32
I’m in.
7
8
I'll see you there, I'm gonna be here
another half an hour at least.

7
Sorry! I'll just be a couple more
minutes late.
1
4
3
5
2
6

7
minutes late.
1
4
3
5
2
6
9 If you wait for me, I’ll come too.

7
minutes late.
1
4
3
5
2
6
9 If you wait for me, I’ll come too.
8 I’m nearly done! Wait for me!!!

By this time...
Half an hour has passed since #1 to #6 were ready to go.

By this time...
#7 has already ﬁnished his work and joined the others.

By this time...
All of them are around #9 desk, waiting for him.

By this time...
All of them are around #9 desk, waiting for him.
#8 joins the waiting crowd a few minutes later.

9 I’m done! Let’s go!
5 Oh Sh**! I forgot to send an email.

#4 goes to the toilet
In the meantime #5 comes back.

#4 goes to the toilet
In the meantime #5 comes back.
#1 is already regretting sending out the invitation.

One hour and ﬁfteen minutes later.

1 43
5
2
6 7 8 9
Only one! We need three
cabs! Let’s wait!

#3 now has to go home to feed his cat.

It’s already 9:30pm, all other venues are packed so
everyone else also goes home, unhappy and thirsty.
#3 now has to go home to feed his cat.

1
I'm off to the pub in 5 minutes sharp.There's
some spaces in the cab.Anyone wanna join me?

1
4
32
I’m in.

1
4
32
I’m in.
5
6
Who’s next?

1
4
32
I’m in.
7
5
6
Who’s next?

1
4
32
I’m in.
7
8
I'll see you there, I'm gonna be here
another half an hour at least.
5
6
Who’s next?

1
43
2
It’s ok. Let’s move
to the next one.

#5 and #6 decided to wait for #7 to share a taxi.
In the mean time...

#8 says the same thing “oh, wait for me, I’m nearly done”
In the mean time...

#8 says the same thing “oh, wait for me, I’m nearly done”
#9 says “I’m almost done too, you three go ﬁrst and I split
a taxi with #8”
In the mean time...

At the pub
1
4 3
2 5
6
7
#8 and #9 are coming, we
should make space for them

Can you think of examples?
Are you one of the thirsty workers that could
go to the pub but is still waiting for everyone?

Do you have working pieces of code, ready
for deploy, that are waiting for colleagues?
Are you one of the thirsty workers that could
go to the pub but is still waiting for everyone?

Is the group of thirsty workers so big that
whenever the chosen pub is closed, ﬁnding
another pub in the busiest time is a diﬃcult
task?

Are the changes you deploy so big, that when
something unexpected happens, you have to
re-sync and deploy everything again?
Is the group of thirsty workers so big that
whenever the chosen pub is closed, ﬁnding
another pub in the busiest time is a diﬃcult
task?

Do the pubs close or are packed before
thirsty workers ﬁnally organize themselves
and get out of the oﬃce?

Do you loose your opportunity window
getting all teams in sync for a release?
Do the pubs close or are packed before
thirsty workers ﬁnally organize themselves
and get out of the oﬃce?

Suggestions
Find a pub that’s not far from the oﬃce.
Have an agreement that every evening, if
someone is thirsty, they just head to the pub,
rather than organizing an outing.

Suggestions
Find a pub that’s not far from the oﬃce.
Have an agreement that every evening, if
someone is thirsty, they just head to the pub,
rather than organizing an outing.
Working at the pub?

Not only working software
but also well-crafted software
Not only responding to change
but also steadily adding value
Not only individuals and interactions
but a community of professionals
Not only customer collaboration
but also productive partnerships

Steadily adding value == Continuous Delivery

Give Back to the world 
==  
Community of Professionals

Productive Partnership (aka the extra mile)

BDD
Behaviour Driven Development

“I want to save 40%
on operational costs”

It has to be a description of a
requirement and its business
beneﬁt, and a set of criteria by
which we all agree that it is
“done”
Dan North

Story: Account Holder withdraws cash

As an Account Holder
I want to withdraw cash from an ATM
So that I can get money when the bank is closed

As an Account Holder
I want to withdraw cash from an ATM
So that I can get money when the bank is closed
Scenario 1: Account has suﬃcient funds
Given the account balance is $100
And the card is valid
And the machine contains enough money
When the Account Holder requests $20
Then the ATM should dispense $20
And the account balance should be $80
And the card should be returned

TDD practices
Deﬁne the API you want to use
Write code based on facts
Write just enough code to make test pass
Read the tests to learn about someone’s else code

TDD practices
Assert First
One Assertion per test
Faking/Stubbing/Mocking
Triangulation

eXtreme Programming
Giles Bowkett blog

Why?
Economics
Design Quality
Satisfaction
Learning
Team building / Communication

Recapping
BDD TDDPair Programming
Software Craftsmanship
Steadily Adding Value

The Path to Continuous Delivery

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