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SoftwareArchitecture
JaapGroeneveld-jGroeneveld.de
“Goodarchitecturemakesthesystemeasytounderstand,easytodevelop,easyto
maintain,andeasytodeploy.Theultimategoalistominimizethelifetimecostofthe
systemandtomaximizeprogrammerproductivity.”
― RobertC.Martin,CleanArchitecture
2
Agenda
DescribingSoftwareC4
Layering
HexagonalArchitecture
ConwaysLaw
DDD:DomainDrivenDesign
3
C4
Providesa"standard"todescribesoftwaresystemsfromdifferentlevels
c4model.com 4
5
6
7
8
Layering
Commontechniqueinsoftwaredesign(FTP->TCP->IP->Ethernet)
Eachlayerrestsonthelowerlayer
Eachhigherlayerusesservicesdefinedbylowerlayer
Eachlayerusuallyhidesitslowerlayerfromtheonesabove
9
Layeringbenefits
Understandingasinglelayerwithoutknowingmuchaboutothers
YoucanbuildanFTPserviceswithoutunderstandingethernet
Youcansubstitutelayerswithalternativeimplementations
Youminimizedependenciesbetweenlayers.
Layersareagoodplaceforstandardization
Oncealayerisbuilt,youcanuseitformanyhigherlevelservices
TCPisusedbyFTP,telnet,SSH,HTTP
10
Thethreeprincipallayers
Presentation-Howtohandleinteractionbetweenuserandsoftware
Domain-(Businesslogic)Logic
Data-Communicatewithothersystems
11
HexagonalArchitecture(PortsandAdapters)
https://www.maibornwolff.de/blog/ddd-architekturen-im-vergleich 12
ConwaysLaw
Organizationswhichdesignsystemsareconstrainedtoproducedesignswhichare
copiesofthecommunicationstructuresoftheseorganizations-Conway,1967.
thoughtworks.com/insights/blog/applying-conways-law-improve-your-software-development 13
Technicalorganizationofteams
14
Technicalorganizationofteams
15
Architecturedrivenbytechnicalcapabilities
16
Organizationofteamsdrivenbybusinesscapabilities
17
Organizationofteamsdrivenbybusinesscapabilities
18
Business-drivenarchitecture
19
DomaindrivenDesign
VorgehensweisezurSoftwareentwicklung,diedasModellierenderfachlichen
ProzesseindenVordergrundrückt
RücktdaserarbeiteneinergemeinsamenSprache"UbiquitousLanguage"inden
Vordergrund
20
DDD:Bestandteile:
EntitiesidentifybyID
ValueObjectsidentifybyvalue
Aggregates
Services
DomainEvents
Modules
Factories
Repositories
...
21
DDD:Vorgehensweisen:
VisionderFachlichkeit(domainvisionstatement)
Kontextübersicht(contextmap)
Kontextgrenzen(boundedcontext)
Kernfachlichkeit(coredomain)
...
22
23

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Jaap Groeneveld - Software Architecture