Alessandro Confetti - Oop vs functional: stop the fight and start building message driven serverless applications - Codemotion Berlin 2018

OOP VS FUNCTIONAL:
STOP THE FIGHT AND START BUILDING
MESSAGE DRIVEN
SERVELESS APPLICATIONS
November 20th 2018 – Codemotion, Berlin
A l e s s a n d r o C o n f e t t i

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Alessandro Confetti - November 20th 2018 – Codemotion, Berlin

3
John McCharty [1927-2011] 
(image by "null0" CC BY-SA 2.0)

LISP
4
(image By Lisp CC BY-SA 4.0)

5
XKCD - Permanent link to this comic

(print "Hello world")
6

LIS(t) P(rocessor)
7

LISP was the first homoiconic
programming language
8

9

…LISP has jokingly been described as “the most
intelligent way to misuse a computer”. I think that
description a great compliment because it transmits
the full flavour of liberation: it has assisted a
number of our most gifted fellow humans in thinking
previously impossible thoughts…
10
Edsger W. Dijkstra,1972 Turing Award Lecture

11
Alan Kay [1940-present] 
(image by Marcin Wichary from San Francisco, U.S.A. - Alan Kay, CC BY 2.0)

SMALLTALK
12
(Byte Magazine Vol. 6 No. 8 cover, August 1981)

The problem with object-oriented languages  
is they've got all this implicit environment that
they carry around with them. You wanted a
banana but what you got was a gorilla
holding the banana and the entire jungle.
13
Joe Amstrong, Coders at Work (ISBN 978-1430219484)

Transcript show: 'Hello, world!'.
14

I'm sorry that I long ago coined  
the term "objects" for this topic
because it gets many people  
to focus on the lesser idea.  
The big idea is "messaging"
15
Alan Kay, 1998 Squeak-dev mailing list

Smalltalk
is about making
small talk in a kind way
16

17

Smalltalk #doesNotUnderstand  
is sent first to the receiver
18

19
LISP SMALLTALK
Focus on data structures Focus on messaging
Functions are used to organise and compose
transformation of data structures
Classes are used to organise behaviour and
object to persist data
Reflection through homoiconicity Reflection through meta-models

SERVERLESS COMPUTING…
…the most intelligent way to misuse  
a bunch of computers

“The Internet would not have happened nearly as
soon as it did except for the fact that John initiated
the development of time-sharing systems. We keep
inventing new names for time-sharing. It came to be
called servers.... Now we call it cloud computing.
That is still just time-sharing. John started it."
21
Lester Earnest, October 28, 2011 Los Anagels Times

I HAVE A LONG STORY OF COMPUTER MISUSE…
22
CPU 6502 @ 1.023MHz
Memory 64 KB RAM (up to 1 MB)
NATURAL LANGUAGE PARSER
80s
CPU 68LC040 @ 25 MHz
Memory 4 MB RAM (up to 36 MB)
CODING IN SMALLTALK
90s
CPU Core i7 @ 2,7 GHz
Memory 16 GB RAM)
RUNNING A FULL K8S
00s

AWS LAMBDA SERVERLESS COMPUTING
23
Image from AWS Lambda ofﬁcial page

Nitro (custom kvm on top of custom asisc)
DO YOU STILL THINK OPTIMISATION IS THE KEY?
24
Node
Pod
JVM
Node
YOUR CODE IS HERE!!!
Fabio Tiriticco Akka Cluster versus Kubernetes: Clustering Solutions Showdown

Datalake Pipeline
Amazon 
Athena
S3
Lambda
Batch
data_lake
EMR
data_lake
Amazon ES
SNS
email
AWS
Lambda
Lambda
load_data
SNS
load_data
Lambda
load_athena
Batch
data_lake
SNS
S3
01_raw_data
S3
02_type_data
03_entities
SNS
info
SNS 
error
metadata sql tableparquet files
S3 
03_entities
html report
Upload
event
csv file
upload
S3
01_raw_data
csv files
S3
01_raw_data
metadata
+
csv files S3
02_type_data
03_entities
parquet files
S3
01_raw_data
metadata
ECR
data_lake
S3
artefacts
scripts
docker image
docker image docker image
S3
03_entities
Tableau
Redash
Metadata
validation/fix
(optional)

26
SERVERLESS
Send
meaningful data structure  
to topics & queues
Use namespaces to group  
your data and functions
Move from monitoring to observability 
(notify what’s going on  
or what you expect to happen next  
with meaningful messages)
LISP SMALLTALK
Focus on data structures Focus on messaging
Functions are used to organise
and compose transformation of
data structures
Classes are used to organise
behaviour and object to persist
data
Reflection through
homoiconicity
Reflection through meta-
models

“The key in making great and growable systems is much
more to design how its modules communicate rather
than what their internal properties and behaviors should be.  
Think of the internet -- to live, it (a) has to allow many
different kinds of ideas and realizations that are beyond
any single standard and (b) to allow varying degrees of
safe interoperability between these ideas.”
27
Alan Kay, 1998 Squeak-dev mailing list

$ tail -f questions
28
Alessandro Confetti
aconfet@thoughtworks.com
twitter @zigolab  
blog http://blog.zigolab.it

WE ARE HIRING IN ITALY!
i n f o - i t @ t h o u g h t w o r k s . c o m
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Alessandro Confetti - Oop vs functional: stop the fight and start building message driven serverless applications - Codemotion Berlin 2018

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Alessandro Confetti - Oop vs functional: stop the fight and start building message driven serverless applications - Codemotion Berlin 2018