it's full of stars - building, measuring and learning with events
TRANSCRIPT
IT’S FULL OF STARSBUILDING, MEASURING AND LEARNING WITH EVENTS
Brent Snook - @brentsnook
@brentsnook
What is the bank balance?
@brentsnook
Jeena deposited $100
Mal withdrew $50
Bron withdrew $60
Overdrawn fee charged of $2
Mal deposited $50
Account
Balance: $ 38
What is the bank balance?
@brentsnook
How much has been charged in fees?
Account
Balance: $ 38
@brentsnook
@brentsnook
we know that there are known knowns
but there are also unknown unknowns
How are we going to use our data?
(the ones we don’t know we don’t know)
@brentsnook
yourdata
hoard
@brentsnook
e e
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correlation
@brentsnook
projectione
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@brentsnook
projectione
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@brentsnook
projectione
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@brentsnook
@brentsnook
LE POULPE COLOSSAL
or
L’INTÉGRATION VIA
LA BASE DE DONNÉES
Pierre Dénys de Montfort
1801
@brentsnook
Anatomy of an Event
{ "eventId": "F59774E7", "sequenceId": 237893473, "eventType": "withdrawalSuccess", "createdAt": "2016-04-02 23239230", "aggregateId": "5B7D5971", "metadata": { "correlationIds": [ "CD5B3E20", "D12C18B7" ] }, "data": { "1.0": { "accountId": "6CEB2C11", "money": { "currency": "AUD", "amount": "34.45" } } } }
@brentsnook
request collaboration
A B C D
@brentsnook
request collaboration
A B C D
@brentsnook
event collaboration
A B C D
@brentsnook
event collaboration
A B C D
@brentsnook
event collaboration
A B C De
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@brentsnook
event collaboration
A B C De
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@brentsnook
SPLITTING THE MONOLITH
@brentsnook
SPLITTING THE MONOLITH• EMIT EVENTS AT KEY PARTS OF THE PROCESS
e e
@brentsnook
SPLITTING THE MONOLITH• EMIT EVENTS AT KEY PARTS OF THE PROCESS• REACT TO THEM TO ADD EVENT-DRIVEN SEAMS
e e
@brentsnook
SPLITTING THE MONOLITH• EMIT EVENTS AT KEY PARTS OF THE PROCESS• REACT TO THEM TO ADD EVENT-DRIVEN SEAMS• MOVE RESPONSIBILITY BETWEEN TWO SEAMS INTO A NEW SERVICE
e e
@brentsnook
SPLITTING THE MONOLITH• EMIT EVENTS AT KEY PARTS OF THE PROCESS• REACT TO THEM TO ADD EVENT-DRIVEN SEAMS• MOVE RESPONSIBILITY BETWEEN TWO SEAMS INTO A NEW SERVICE• REPEAT
e e
@brentsnook
e e e e e e e e e e e e e e e e
Event Bus
MY GOD, IT ’S FULL OF EVENTS …
ATM Query
Event Store Billing
Internet Banking Web UI
Internet Banking
API
Reports
User Mgmt. Accounts
Paper Mail
@brentsnook
C H A L L E N G E S
@brentsnook
Q U E S T I O N S ?
@brentsnook
REFERENCES/FURTHER READING• Event Collaboration
• http://martinfowler.com/eaaDev/EventCollaboration.html • Event Sourcing
• http://martinfowler.com/eaaDev/EventSourcing.html • https://www.thoughtworks.com/radar/techniques/event-sourcing
• Greg Young - Event Sourcing Talk at Code on the Beach 2014 • https://www.youtube.com/watch?v=JHGkaShoyNs
• Command/Query Responsibility Segregation (CQRS) • http://martinfowler.com/bliki/CQRS.html
• Domain Driven Design incl. Aggregates, Bounded Contexts and Anti-Corruption Layers • https://www.infoq.com/minibooks/domain-driven-design-quickly • http://martinfowler.com/bliki/DDD_Aggregate.html • http://martinfowler.com/bliki/BoundedContext.html
http://www.markhneedham.com/blog/2009/07/07/domain-driven-design-anti-corruption-layer/ • Event Storming
• http://ziobrando.blogspot.com.au/2013/11/introducing-event-storming.html • Seams
• http://www.informit.com/articles/article.aspx?p=359417&seqNum=2 • Software Entropy
• https://en.wikipedia.org/wiki/Software_entropy • AWS Technologies
• https://aws.amazon.com/kinesis/streams/ • https://aws.amazon.com/sqs/ • https://aws.amazon.com/sns/ • https://aws.amazon.com/lambda/details/
@brentsnook
IMAGES• Images from “2001 - A Space Odyssey”
• COPYRIGHT © Metro-Goldwyn-Mayer Inc.; 3 April 1968; LP36136 (in copyright registry) • © Renewed 1996 by Turner Entertainment Company
• Images from”Willy Wonka and the Chocolate Factory” • COPYRIGHT © MCMLXXI BY WOLPER PICTURES, LTD. AND THE QUAKER OATS COMPANY ALL RIGHTS RESERVED • © Renewed 1999 by Warner Bros., a division of Time Warner Entertainment Company, LP
• Rumsfeld • https://commons.wikimedia.org/wiki/File:Donald_Rumsfeld_Defenselink.jpg
• Cluttered Store • https://www.flickr.com/photos/tallkev/4082110101/
• Le Poulpe Colossal • https://commons.wikimedia.org/wiki/File:Histoire_naturelle,_g%C3%A9n%C3%A9rale_et_particuli%C3%A8re_des_mollusques_(6261008252).jpg
• Dominoes • https://www.flickr.com/photos/daxx13/6289764937/
• Stars • https://www.flickr.com/photos/122323654@N05/15024418586/
• Waterfall • https://www.flickr.com/photos/btf5/13958611932/
• Heart • http://thegraphicsfairy.com/wp-content/uploads/2013/02/Anatomy-Heart-Images-Vintage-GraphicsFairy1.jpg
• Bear 1 • https://www.flickr.com/photos/deischi/7765087960/
• Bear 2 • https://www.flickr.com/photos/usfws_alaska/8384015991/
• Bear 3 • https://www.flickr.com/photos/deischi/7765098472/
• Bear 4 • https://www.flickr.com/photos/deischi/7765062054/
• Bucket Brigade • http://digital.library.upenn.edu/women/brody/fire/4-100.jpeg • Big Fire Engine Book by Virginia Brody (fl.1960), Illustrations by Mazoujian. New York, McGraw-Hill, 1958. Copyright not renewed.
• Paper Background • https://www.flickr.com/photos/schmod/419640051
• Database • https://commons.wikimedia.org/wiki/File:Database.svg
• Cloud • https://commons.wikimedia.org/wiki/File:Emojione_2601.svg @brentsnook