4. Why BigDUF is difficult?
“There are known unknowns, but there are
also unknown unknowns”
– Donald Rumsfeld
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7. What is Architecture?
“All architecture is design, but not all design is architecture.
Architecture represents the significant design decisions that
shape a system, where significance is measured by cost of
change.
- Grady Booch”
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8. Role of an Architect?
Minimize the
architecture!
Convert Architecture to Design!
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9. Role of an Architect?
Making things easy to change
Is a complex task…
It’s the complexity that makes things
difficult to change!
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10. In addition, successful Architects do
> Understand end-to-end process
> Understand the vision and context
> Derive solutions from real customer needs
> Pragmatic on technology usage
> Influence the requirements
> Communicate with stakeholders
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11. BigDUF or LittleDUF?
Make decisions at a point at which you have the most context
and knowledge on which to base the decision.
Make the commitment the moment at which failing to make a
decision eliminates an important alternative
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12. What about Brownfield Projects?
You are the accountant of
technical debts!
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13. What about Brownfield Projects?
Be the miner & planter of patterns!
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-There a constraint on deployment environment - Technology is going to be out dated - Two selected technologies conflict with each other - Competition has moved to a different platform
Predicting future is difficult. We software developers are a set of lazy guys.- Build technical flexibility- It is the your architecture that enables you to be agile.
- Being agile is not just about ‘daily standups’ and ‘scrum masters’- It is the cohesive connected technical and management approach, that makes you agile
Things that are of high cost of change: - data schema - authorization - addressing - ModularizationLow coupling and high-cohesionComponent based architecture - independently evolving - loosely coupled,corse grained, with own life cycle - independently test - layeringIt is not true everything can be emerging - But architecture should not be emergent. You need something to build upon - Design can be emergent, make architecture evolutionary
Architecture is the constraints – things that are hard to changeThere should be little as much as possible of the constraintsExamples: - Data schema: ORM - Authorization: Facades for evolving areas - ModularizationLow coupling and high-cohesionComponent based architecture - independently evolving - loosely coupled,corse grained, with own life cycle - independently test
Now you know theory.. Sounds pretty easy to do… - Spring context files - Plugin architecture for JS - Hyper generic utility methods
Decisions made too late in a project are hugely riskyDecisions made too early in a project are arguably even moreriskyEvolutionary architecture often ends up in a disaster - aggregation of bunch of adhoc tactics - perception of no design - developers act like kidsLast responsible moment - knowledge and context - the longer you wait, the better the decisionArchitecture is requested when least amount of information is availableDo not delay too long.. And things will be difficult to change
Technical debt is accumulated future work that resulted by decisions made during the development of softwareWhy? - schedule pressure - bought systems - unknown unknowns - better knowledgeReduce marginal cost of a new feature
Find patternsWho talk to whomConstraintsMessages between componentsStyles/design patternsData structuresHarvest patternsReverse engineer the architectureWhere to Refactor?- Reduce cyclomatic complexity (edges –nodes + 2)- Afferent coupling – measure of importance
