Building Evolutionary Architectures - Neal Ford

1 Building Evolutionary Architectures @neal4d Rebecca Parsons & Pat KuaRebecca ParsonsPat KuaNeal FordPhotos by Martin Fowler: is Software architecture ?Entire architectural ScoperequirementsEntire architectural Scopetimeperformancelegalityscalabilitys ecuritydataauditabilityrequirementssampl ingaccessibilityreliabilityrepeatability accountabilityextensibilityreproducibili tyaccuracyfailure transparencyresilienceadaptabilityfault- toleranceresponsivenessadministrabilityf idelityreusabilityaffordabilityflexibili tyrobustnessagilityinspectabilitysafetya uditabilityinstallabilityscalabilityauto nomyintegrityseamlessnessavailabilityint erchangeabilityself-sustainabilitycompat ibilityinteroperabilityserviceabilitycom posabilitylearnabilitysupportabilityconf igurabilitymaintainabilitysecurabilityco rrectnessmanageabilitysimplicitycredibil itymobilitystabilitycustomizabilitymodif iabilitystandards

2 Compliancedebugabilitymodularitysurvivab ilitydegradabilityoperabilitysustainabil itydeterminabilityorthogonalitytailorabi litydemonstrabilityportabilitytestabilit ydependabilityprecisiontimelinessdeploya bilitypredictabilitytraceabilitydiscover abilityprocess transparencyresilienceadaptabilityfault- toleranceresponsivenessadministrabilityf idelityreusabilityaffordabilityflexibili tyrobustnessagilityinspectabilitysafetya uditabilityinstallabilityscalabilityauto nomyintegrityseamlessnessavailabilityint erchangeabilityself-sustainabilitycompat ibilityinteroperabilityserviceabilitycom posabilitylearnabilitysupportabilityconf igurabilitymaintainabilitysecurabilityco rrectnessmanageabilitysimplicitycredibil itymobilitystabilitycustomizabilitymodif iabilitystandards

3 Compliancedebugabilitymodularitysurvivab ilitydegradabilityoperabilitysustainabil itydeterminabilityorthogonalitytailorabi litydemonstrabilityportabilitytestabilit ydependabilityprecisiontimelinessdeploya bilitypredictabilitytraceabilitydiscover abilityprocess capabilitiestransparencydistributability producibilityubiquitydurabilityprovabili tyunderstandabilityeffectivenessrecovera bilityupgradabilityefficiencyrelevanceus abilityevolvabilityOnce I ve built an architecture , how can I prevent it from gradually degrading over time?How is long term planning possible when things change unexpectedly?

4 Dynamic EquilibriumArchitecture is the decisions that you wish you could get right early in a project. Ralph Johnsonthings that people perceive as hard to if we build Architectures that expect change?Definition:An Evolutionary architecture supports incremental, guided change as a first principle across multiple dimensions. Perspectives on ArchitectureTechnical ArchitectureEvolvability of ArchitecturesBig Ball of Mudclassescoupling connections0dimensions :Layered Architecture1dimensions :opportunities: 4 Microkernel1dimensions :REST1dimensions :Domain Perspective0dimensions :Microservicesndimensions : Evolutionary architectureAn Evolutionary architecture supports incremental, guided change as a first principle across multiple dimensions.

5 Evolutionary architectureDefinition:ComposabilityComp osabilityComposabilityDefinition:An Evolutionary architecture supports incremental, guided change as a first principle across multiple dimensions. Evolutionary architectureIncremental ChangeproductionComponents are are consist of ChangeproductionDefinition:An Evolutionary architecture supports incremental, guided change as a first principle across multiple dimensions. Evolutionary architecturePerspectives on ArchitectureData ArchitecturePerspectives on ArchitectureSecurity ArchitecturePerspectives on ArchitectureDomain ArchitectureMicroservicesDomain architecture +Fitness Functions a particular type of objective function that is used to close a given design solution is to achieving the set Fitness Functions metricstestsDefinition:An Evolutionary architecture supports incremental, guided change as a first principle across multiple dimensions.

6 Evolutionary architectureAgendadefinitionincremental changefitness functionsappropriate couplingFitness Functiona particular type of objective function that is used to close a given design solution is to achieving the set Fitness FunctionsmetricstestsArchitecture Fitness FunctionsmetricstestsFitness FunctionatomicholisticbatchcontinuousFit ness FunctionatomicholisticbatchcontinuousFit ness FunctionatomicholisticbatchcontinuousCyc lic Dependency Coupling Fitness Functionapplication Fitness FunctionatomicholisticbatchcontinuousFit ness FunctionatomicholisticbatchcontinuousFit ness Functionatomicholisticbatchcontinuoushol isticbatchHolistic fitness functions must run in a specific (shared) Driven FunctionatomicholisticbatchcontinuousFit ness FunctionatomicholisticbatchcontinuousFit ness Functionatomicholisticbatchcontinuousato miccontinuousmonitoringloggingFitness FunctionatomicholisticbatchcontinuousFit ness FunctionatomicholisticbatchcontinuousFit ness Functionatomicholisticbatchcontinuoushol istic resilience-ility?

7 Fitness FunctionatomicholisticbatchcontinuousFit ness FunctionatomicholisticbatchcontinuousSys tem-wide Fitness FunctionFitness Function FitGuided EvolutionAgendadefinitionincremental changefitness functionsappropriate couplingPrerequisitesDeployment PipelineDeployment PipelineIncremental ChangeEngine of Evolutionary architecturev c where c = cycle time v = maximum speed of new generationsAgendadefinitionincremental changefitness functionsappropriate couplingCustomerCode Reuse (Over Time)checkoutshippingSOAcheckoutshipping microservicesCode Reuse (Over Time)The more reusable code is.

8 The less usable it Data ManagementDecentralized Data ManagementTransactions are temporal Data ManagementLimit transactional Database ColumnsTransitionExpand/Contract Patternapp v230compatible with db v14DB version 15DB version 14app v205compatible with db v13 and v14app v234compatible with db v14app v241compatible with db v14 and 15DB version 13app v248compatible with db v15 Timeapp v205deployedmigratedb to v14app v230deployedapp v234deployedapp v234deployedapp v248deployedmigratedb to v15 Decentralized GovernanceDecentralized GovernanceDecentralized Governance Goldilocks GovernanceChoose technology stacks appropriate to problem to Domain-centric ArchitecturesShift to Domain-centric ArchitecturesShift to Domain-centric ArchitecturesIncidentally Coupled Teamsuser interfaceserver-sideDBAC onway s Laworganizations which design systems.

9 Are constrained to produce designs which are copies of the communication structures of these Conway, 1968 Incidentally Coupled Teamsuser interfaceserver-sideDBAA utonomous TeamsOrdersShippingInverse Conway ManeuverCatalogLow Efferent Coupling between Teamsn(n-1) 2 Architectural QuantumArchitectural QuantumArchitectural QuantumArchitectural QuantumUtilizing Evolutionary Architecture1. Choose DimensionsEntire architectural Scopetimeperformancelegalityscalabilitys ecuritydataauditabilityrequirementsEntir e architectural Scopefitness functionstimeperformancelegalityscalabil itysecuritydataauditabilityrequirementsE ntire architectural Scopefitness functionstimeperformancelegalityscalabil itysecuritydataauditabilityrequirementsU tilizing Evolutionary Architecture2.

10 Identify Fitness Functionsatomicholistic/automated / manualUtilizing Evolutionary Architecture3. Apply Incremental ChangeUtilizing Evolutionary ArchitectureUtilizing Evolutionary ArchitectureAgendadefinitionincremental changefitness functionsappropriate couplingWhy should a company decide to build an Evolutionary architecture ?Why should a company decide to build an Evolutionary architecture ?Predictable versus Evolvable Scale Cycle Time as a Business Metric Isolating ilities at the Quantum Level Longer Lasting Useful Systems Advanced Business CapabilitiesWhy should a company decide to build an Evolutionary architecture ?