DDD & Microservices: At Last, Some Boundaries! • Eric Evans • GOTO 2015

This presentation was recorded at GOTO Berlin 2015. #gotocon #gotober
gotober.com
Eric Evans - Author of Domain Driven Design
ABSTRACT
Microservices are associated with extreme isolation (e.g. no shared database, autonomous dev-ops teams, etc.) At its best, this creates a practical boundary within which modeling and design have a chance to thrive. In Domain-driven Design (DDD) we call this a "Bounded Context". Bounded contexts take many forms, some [...]
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RECOMMENDED BOOKS
Eric Evans • Domain-Driven Design • amzn.to/3tnGhwm
Sam Newman • Monolith to Microservices • amzn.to/2Nml96E
Sam Newman • Building Microservices • amzn.to/3dMPbOs
Ronnie Mitra & Irakli Nadareishvili • Microservices: Up and Running• amzn.to/3c4HmmL Mitra, Nadareishvili, McLarty & Amundsen • Microservice Architecture • amzn.to/3fVNAb0
Chris Richardson • Microservices Patterns • amzn.to/2SOnQ7h
Adam Bellemare • Building Event-Driven Microservices • amzn.to/3yoa7TZ
Dave Farley • Continuous Delivery Pipelines • amzn.to/3hjiE51
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#DDD #Microservices #DomainDrivenDesign
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kzbin.info...

[@diogobr07]

1:04 Intro. 1:45 Why do I like Microservices? 7:57 Services and Messages 9:22 Bounded Context 10:36 Context Map Explanation 17:35 Models need to be clear not big 22:44 Not all of a large system will be well designed (Say it three times in the mirror every morning! 😄)

[@diogobr07]

25:43 Interchange Context 29:19 Why not logical boundaries? 32:56 Wrap up 36:26 One more time: "Not all of a large system will be well designed" 37:22 Some time for questions

[@colinrickels201]

I love how eric doesn't have to be this eccentric other worldly person that we can barely make sense of. Hes one of these architects that leaves the jargon behind and speaks to us as normal people. Great speech !

[@masoud.alinaghian]

yeah I guess "F needs to conform to A" is very human language, lets pretend context map is our everyday language!

[@sohamjoshi9527]

i have been relistening to this talk year after year and every year i am able to find something very useful applicable to the different things i have done over the years. truly a gem of a talk.

[@lionofjudah61967]

Brilliant mind comes through shining in this very helpful presentation. Thanks Eric!

[@AnitShrestha]

I just love listening how Eric explains.

[@kerimberdimyradov991]

good talk! very usefull. but i recomend to switch the speed of video to 1.5 - Eric is very slow speaker as for me (not native english speaker i mean)

[@ornous]

Great talk, indeed! +Ali Horezmi Thanks for the advice. 1.5 felt very natural, indeed!

[@andypandy6063]

Irony is so underestimated. :D

[@MrAconfee]

I started watching this at 1.5, came back to it a few hours later, forgetting I had sped it up, and it took me about 3 minutes to realize that it was being sped up. haha Thanks for the tip.

[@iphadkegmail]

This was actually the perfect speed for me, gave me time to go back in my mind and draw similarities from my experience to what Eric was referring to. That really enhanced the experience. This is more of a philosophical discussion requiring lot of introspection rather than a "how-to".

[@lancerkind]

Kerim Berdimyradov How do you adjust speed (iPad)? I just see quality.

[@truekiba]

I highly recommend watching this in 1.5x speed. It sound surprisingly normal and your done quicker.

[@gokuljadhav.g8556]

Awesome talk. Very helpful !! I like the analogy about Car engine and Very big ACL for engine. Great imagination.

[@significantfrank]

Aside from AC which D used to conform A, to accommodate A's change. it could also be a chance to evolve our Domain Model when change comes.

[@bhimraogornale6024]

very enlightening

[@lancerkind]

I like how Eric outlines the problem of multi-team software development in the first 25 minutes. Chances are you've seen this happen but weren't conscious of the patterns.

[@javierolazaran7227]

Great mind in the body of the actor from Sledge Hammer. Good stuff!

[@flashflexpro]

"Sometimes you know that you need a wall ...", that's absolutely right!!!

[@diogobr07]

1:04 Intro. 1:45 Why do I like Microservices? 7:57 Services and Messages 9:22 Bounded Context 10:36 Context Map Explanation 17:35 Models need to be clear not big 22:44 Not all of a large system will be well designed (Say it three times in the mirror every morning! 😄) 25:43 Interchange Context 29:19 Why not logical boundaries? 32:56 Wrap up 36:26 One more time: "Not all of a large system will be well designed" 37:22 Some time for questions

[@ndenkha]

I always thought of this that a service owns its repository (DB), but what if I have a legacy monolithic system with a big DB, and instead of having one service that does everything why can't we have different micro services that deal with the same DB?

[@imaginarynoise3218]

It depends on the database system. Conflicts with the data updating, how it is used, having "multiple sources of truth" determining what is correct data; this can get complicated. It is technically do-able, but it is usually beneficial to wrap the raw data functionality in some logic to control and verify and prevent whatever problems might otherwise crop up.

[@georgesmith3022]

Because if you have a single monolithic db performance will suck, bcoz it will be a bottleneck. The bottleneck is usually io operations

[@mohamedfouad2304]

keep the old system, and keep building new microservices with their own datastores, slowly making the old absolute

[@burhanotour2049]

Speed up the video to 1.25x ! It will be best

[@smonkey001]

AC = write validations !

[@felixdPL]

x1.25 works best ;)

[@sascha-oliverprolic923]

Lol, I tried and it is true

[@paulfrischknecht3999]

All of digital electronics has an anti corruption layer at each logic gate, each transistor: they interpret and clean up a noisy continuous signal to a 0 or 1. Cannot interpret data more simply than in two ways.

[@sweetphilly2]

Dang I'm listening on 1.25x and not noticing a difference lol I kinda appreciate that though

[@kylemacarthur9863]

2x. I was looking for 3x

[@MDrivenOfficial]

Hey Evans - what is your reaction to this kzbin.info/www/bejne/iomVnXlrmdSNhpI - if we apply your DDD strategies with model execution will that not be very much faster than what you suggest?

[@user-jm7qw8wr1e]

안녕하세여

[@andypandy6063]

Always be in the domain of what you develop. Don't develop a washingmaschine while being in the domain of lawnmowers. Pretty Obvious right?

[@owaisabbasi955]

why why why.???????

[@adammarek8822]

This talk is a waste of time. Sadly, Eric, is a very mediocre speaker. The whole talk can summerized in 3 sentenses.