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SoftwareArchitecture
JaapGroeneveld-jGroeneveld.de

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“Goodarchitecturemakesthesystemeasytounderstand,easytodevelop,easyto
maintain,andeasytodeploy.Theultimategoalistominimizethelifetimecostofthe
systemandtomaximizeprogrammerproductivity.”
― RobertC.Martin,CleanArchitecture
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Agenda
DescribingSoftwareC4
Layering
HexagonalArchitecture
ConwaysLaw
DDD:DomainDrivenDesign
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C4
Providesa"standard"todescribesoftwaresystemsfromdifferentlevels
c4model.com 4

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Layering
Commontechniqueinsoftwaredesign(FTP->TCP->IP->Ethernet)
Eachlayerrestsonthelowerlayer
Eachhigherlayerusesservicesdefinedbylowerlayer
Eachlayerusuallyhidesitslowerlayerfromtheonesabove
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Layeringbenefits
Understandingasinglelayerwithoutknowingmuchaboutothers
YoucanbuildanFTPserviceswithoutunderstandingethernet
Youcansubstitutelayerswithalternativeimplementations
Youminimizedependenciesbetweenlayers.
Layersareagoodplaceforstandardization
Oncealayerisbuilt,youcanuseitformanyhigherlevelservices
TCPisusedbyFTP,telnet,SSH,HTTP
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Thethreeprincipallayers
Presentation-Howtohandleinteractionbetweenuserandsoftware
Domain-(Businesslogic)Logic
Data-Communicatewithothersystems
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HexagonalArchitecture(PortsandAdapters)
https://www.maibornwolff.de/blog/ddd-architekturen-im-vergleich 12

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ConwaysLaw
Organizationswhichdesignsystemsareconstrainedtoproducedesignswhichare
copiesofthecommunicationstructuresoftheseorganizations-Conway,1967.
thoughtworks.com/insights/blog/applying-conways-law-improve-your-software-development 13

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Technicalorganizationofteams
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Technicalorganizationofteams
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Architecturedrivenbytechnicalcapabilities
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Organizationofteamsdrivenbybusinesscapabilities
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Organizationofteamsdrivenbybusinesscapabilities
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Business-drivenarchitecture
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DomaindrivenDesign
VorgehensweisezurSoftwareentwicklung,diedasModellierenderfachlichen
ProzesseindenVordergrundrückt
RücktdaserarbeiteneinergemeinsamenSprache"UbiquitousLanguage"inden
Vordergrund
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DDD:Bestandteile:
EntitiesidentifybyID
ValueObjectsidentifybyvalue
Aggregates
Services
DomainEvents
Modules
Factories
Repositories
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DDD:Vorgehensweisen:
VisionderFachlichkeit(domainvisionstatement)
Kontextübersicht(contextmap)
Kontextgrenzen(boundedcontext)
Kernfachlichkeit(coredomain)
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