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@YourTwitterHandle #YourSessionHashtag Gayathri Thiyagarajan & Andrew Harmel-Law, Capgemini UK http://capgemini.github.io Harnessing Domain Driven Design for Distributed Systems @gaythu_rajan / @al94781 #harnessing_ddd

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cc: kennyma*c - h-ps://www.flickr.com/photos/99472898@N00 @gaythu_rajan / @al94781 #harnessing_ddd Who are we?

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Who are we? The image cannot be displayed. Your computer may not have enough memory to open the image, or the image may have been corrupted. Restart your computer, and then open the file again. If the red x still appears, you may have to delete the image and then insert it again. @gaythu_rajan / @al94781 #harnessing_ddd

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“Microservice”? @gaythu_rajan / @al94781 #harnessing_ddd

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“Microservice”? (cont.) @gaythu_rajan / @al94781 #harnessing_ddd

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“Microservice”? (cont.) @gaythu_rajan / @al94781 #harnessing_ddd

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“Microservice”? (cont.) @gaythu_rajan / @al94781 #harnessing_ddd

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“Microservice”? (cont.) @gaythu_rajan / @al94781 #harnessing_ddd

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“Microservice”? (cont.) @gaythu_rajan / @al94781 #harnessing_ddd

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Microservices ROCK! cc: RaeAllen - h-ps://www.flickr.com/photos/30628871@N00 @gaythu_rajan / @al94781 #harnessing_ddd

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Microservices are HARD @gaythu_rajan / @al94781 #harnessing_ddd

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“Ge;ng service boundaries wrong can result in having to make lots of changes in service-service collaboraEon. An expensive operaEon.” from Sam Newman, “Building Microservices” (secEon: When shouldn’t you use Microservices) Boundaries are HARDEST @gaythu_rajan / @al94781 #harnessing_ddd

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Microservices LOVE DDD cc: {AndreaRenee} - h-ps://www.flickr.com/photos/30282864@N02 “Despite the hype [microservices] probably giv[e] us the best environment we have ever had for doing Domain-Driven Design” (Interview with Eric Evans at 2015 DDD Exchange) @gaythu_rajan / @al94781 #harnessing_ddd

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cc: taberandrew - h-ps://www.flickr.com/photos/88442983@N00 Unfortunately... @gaythu_rajan / @al94781 #harnessing_ddd

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Some steps... cc: marsupium photography - h-ps://www.flickr.com/photos/43405950@N07 @gaythu_rajan / @al94781 #harnessing_ddd

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The Core How DDD helps our CODE cc: Laurence Vagner - h-ps://www.flickr.com/photos/86078191@N00 @gaythu_rajan / @al94781 #harnessing_ddd

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Ubiquitous Language cc: mag3737 - h-ps://www.flickr.com/photos/50318388@N00 @gaythu_rajan / @al94781 #harnessing_ddd

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Hands-On Modellers cc: jovike - h-ps://www.flickr.com/photos/49503078599@N01 @gaythu_rajan / @al94781 #harnessing_ddd

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The Misapplied How DDD helps our overall Architecture cc: juhansonin - h-ps://www.flickr.com/photos/38869431@N00 @gaythu_rajan / @al94781 #harnessing_ddd

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The Important Bits •  Models •  Aggregates •  Contexts •  Bounded Contexts •  Context Maps @gaythu_rajan / @al94781 #harnessing_ddd

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Shared Payment Services Our Case Study: cc: Khánh Hmoong - h-ps://www.flickr.com/photos/7997148@N05 @gaythu_rajan / @al94781 #harnessing_ddd

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Shared Payment Services @gaythu_rajan / @al94781 #harnessing_ddd

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@gaythu_rajan / @al94781 #harnessing_ddd Shared Payment Services

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@gaythu_rajan / @al94781 #harnessing_ddd Shared Payment Services

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@gaythu_rajan / @al94781 #harnessing_ddd Shared Payment Services

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Models cc: Rob Swatski - h-ps://www.flickr.com/photos/50946274@N02 @gaythu_rajan / @al94781 #harnessing_ddd

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@gaythu_rajan / @al94781 #harnessing_ddd

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@gaythu_rajan / @al94781 #harnessing_ddd

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@gaythu_rajan / @al94781 #harnessing_ddd

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@gaythu_rajan / @al94781 #harnessing_ddd

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@gaythu_rajan / @al94781 #harnessing_ddd

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@gaythu_rajan / @al94781 #harnessing_ddd

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Aggregates cc: J-W Brown - h-ps://www.flickr.com/photos/13797487@N00 @gaythu_rajan / @al94781 #harnessing_ddd

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@gaythu_rajan / @al94781 #harnessing_ddd

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Contexts cc: pe*tshoo - h-ps://www.flickr.com/photos/29426084@N00 @gaythu_rajan / @al94781 #harnessing_ddd

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@gaythu_rajan / @al94781 #harnessing_ddd

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@gaythu_rajan / @al94781 #harnessing_ddd

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Bounded Contexts cc: bryce_edwards - h-ps://www.flickr.com/photos/98185064@N00 @gaythu_rajan / @al94781 #harnessing_ddd

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@gaythu_rajan / @al94781 #harnessing_ddd

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@gaythu_rajan / @al94781 #harnessing_ddd

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Context Maps cc: roger4336 - h-ps://www.flickr.com/photos/24736216@N07 @gaythu_rajan / @al94781 #harnessing_ddd

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@gaythu_rajan / @al94781 #harnessing_ddd

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@gaythu_rajan / @al94781 #harnessing_ddd

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Why Aggregates? @gaythu_rajan / @al94781 #harnessing_ddd

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@gaythu_rajan / @al94781 #harnessing_ddd Aggregate == Microservice

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@gaythu_rajan / @al94781 #harnessing_ddd Aggregate == Microservice

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But, Aggregate != Microservice (not always) @gaythu_rajan / @al94781 #harnessing_ddd

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@gaythu_rajan / @al94781 #harnessing_ddd But, Aggregate != Microservice (not always)

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@gaythu_rajan / @al94781 #harnessing_ddd

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1.  Draw a Model and begin to implement it cc: Muffet - h-ps://www.flickr.com/photos/53133240@N00 An Approach @gaythu_rajan / @al94781 #harnessing_ddd

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1.  Draw a Model and begin to implement it 2.  As you draw it and code it, listen to the Language and culEvate your Model accordingly cc: Muffet - h-ps://www.flickr.com/photos/53133240@N00 An Approach @gaythu_rajan / @al94781 #harnessing_ddd

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1.  Draw a Model and begin to implement it 2.  As you draw it and code it, listen to the Language and culEvate your Model accordingly 3.  IdenEfy your Aggregates - these are your starter Microservices cc: Muffet - h-ps://www.flickr.com/photos/53133240@N00 An Approach @gaythu_rajan / @al94781 #harnessing_ddd

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cc: Muffet - h-ps://www.flickr.com/photos/53133240@N00 An Approach @gaythu_rajan / @al94781 #harnessing_ddd 1.  Draw a Model and begin to implement it 2.  As you draw it and code it, listen to the Language and culEvate your Model accordingly 3.  IdenEfy your Aggregates - these are your starter Microservices 4.  When you hit pain points (indicated by the Language) split into different Bounded Contexts to resolve

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1.  Draw a Model and begin to implement it 2.  As you draw it and code it, listen to the Language and culEvate your Model accordingly 3.  IdenEfy your Aggregates - these are your starter Microservices 4.  When you hit pain points (indicated by the Language) split into different Bounded Contexts to resolve 5.  Revisit your Bounded Contexts now you know more about how each Aggregate - you may end up spli;ng them cc: Muffet - h-ps://www.flickr.com/photos/53133240@N00 An Approach @gaythu_rajan / @al94781 #harnessing_ddd

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Done? cc: WarzauWynn - h-ps://www.flickr.com/photos/94246031@N00 @gaythu_rajan / @al94781 #harnessing_ddd

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The Ignored How DDD helps our Teams Organise cc: aha42 | tehaha - h-ps://www.flickr.com/photos/31549162@N05 @gaythu_rajan / @al94781 #harnessing_ddd

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@gaythu_rajan / @al94781 #harnessing_ddd Customer-Supplier Partnership Anti-Corruption Layer Upstream Downstream

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Shared Kernel Separate Ways An*- Corrup*on Layer Partner- ship Conform- ist Open Host Service Customer / Supplier Control Over Associated Teams CommunicaEons Commitment / Capability of Teams @gaythu_rajan / @al94781 #harnessing_ddd

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Shared Kernel Separate Ways An*- Corrup*on Layer Partner- ship Conform- ist Open Host Service Customer / Supplier Control Over Associated Teams CommunicaEons Commitment / Capability of Teams @gaythu_rajan / @al94781 #harnessing_ddd

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Shared Kernel Separate Ways An*- Corrup*on Layer Partner- ship Conform- ist Open Host Service Customer / Supplier Control Over Associated Teams CommunicaEons Commitment / Capability of Teams @gaythu_rajan / @al94781 #harnessing_ddd

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Upstream/Downstream cc: archer10 (Dennis) (73M Views) - h-ps://www.flickr.com/photos/22490717@N02 @gaythu_rajan / @al94781 #harnessing_ddd

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Partnership cc: prac*calowl - h-ps://www.flickr.com/photos/55046645@N00 @gaythu_rajan / @al94781 #harnessing_ddd

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@gaythu_rajan / @al94781 #harnessing_ddd Partnership

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@gaythu_rajan / @al94781 #harnessing_ddd

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Customer-Supplier cc: TheeErin - h-ps://www.flickr.com/photos/27073477@N00 @gaythu_rajan / @al94781 #harnessing_ddd

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@gaythu_rajan / @al94781 #harnessing_ddd Customer-Supplier

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@gaythu_rajan / @al94781 #harnessing_ddd @gaythu_rajan / @al94781 #harnessing_ddd

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An*-Corrup*on Layer @gaythu_rajan / @al94781 #harnessing_ddd

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@gaythu_rajan / @al94781 #harnessing_ddd Anti-Corruption Layer Upstream Downstream

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@gaythu_rajan / @al94781 #harnessing_ddd

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Done Done cc: jayneandd - h-ps://www.flickr.com/photos/8180853@N07 @gaythu_rajan / @al94781 #harnessing_ddd

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Take Home Messages cc: Manoj Kengudelu - h-ps://www.flickr.com/photos/11767573@N02 •  Find the right Microservices - or you’ll pine for the Monolith @gaythu_rajan / @al94781 #harnessing_ddd

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Take Home Messages cc: Manoj Kengudelu - h-ps://www.flickr.com/photos/11767573@N02 •  Find the right Microservices - or you’ll pine for the Monolith •  Don’t get confused about BCs - they will fall out if you listen to the Language @gaythu_rajan / @al94781 #harnessing_ddd

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Take Home Messages •  Find the right Microservices - or you’ll pine for the Monolith •  Don’t get confused about BCs - they will fall out if you listen to the Language •  Organise around your services beger - apply the Strategic Pagerns cc: Manoj Kengudelu - h-ps://www.flickr.com/photos/11767573@N02 @gaythu_rajan / @al94781 #harnessing_ddd

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Take Home Messages •  Find the right Microservices - or you’ll pine for the Monolith •  Don’t get confused about BCs - they will fall out if you listen to the Language •  Organise around your services beger - apply the Strategic Pagerns •  Be inspired to do more Domain Driven Design cc: Manoj Kengudelu - h-ps://www.flickr.com/photos/11767573@N02 @gaythu_rajan / @al94781 #harnessing_ddd

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And Finally... cc: oatsy40 - h-ps://www.flickr.com/photos/68089229@N06 @gaythu_rajan / @al94781 #harnessing_ddd

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Ques*ons Please cc: Derek Bridges - h-ps://www.flickr.com/photos/84949728@N00 @gaythu_rajan / @al94781 #harnessing_ddd

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Oh, and we (Capgemini ) are hiring! (visit bit.ly/cg-jvm-jobs-ddd) cc: ptrlx - h-ps://www.flickr.com/photos/58615912@N05 @gaythu_rajan / @al94781 #harnessing_ddd

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Read More... •  hgps://capgemini.github.io/architecture/ microservices-reality-check/ •  hgps://capgemini.github.io/architecture/ why-microservices-are-right-for-us-pt1/ •  hgps://capgemini.github.io/architecture/ microservices-like-change/ •  hgps://capgemini.github.io/architecture/ microservices-gotchas/ cc: Manoj Kengudelu - h-ps://www.flickr.com/photos/11767573@N02 @gaythu_rajan / @al94781 #harnessing_ddd