Pragmatic Architecture, Today - Carnegie Mellon University · 2017-05-02 · Accessibility...
Transcript of Pragmatic Architecture, Today - Carnegie Mellon University · 2017-05-02 · Accessibility...
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PRAGMATIC ARCHITECTURE, TODAY BART BLOMMAERTS@DAGGIEBE
SATURN, 2017-05-02
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BART BLOMMAERTS
▸ Application Architect
▸ Ordina Belgium
▸ JWorks
▸ @DaggieBe
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WHAT?Architecture
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VIEWPOINTS
▸ Context
▸ Functional
▸ Information
▸ Concurrency
▸ Development
▸ Deployment
▸ Operational
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▸ Accessibility
▸ Availability and Resilience
▸ Development Resource
▸ Evolution
▸ Internationalization
PERSPECTIVES
▸ Location
▸ Performance and Scalability
▸ Regulation
▸ Security
▸ Usability
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REALLY?Architecture
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ABILITY TO CHANGE
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ARCHITECTURE REPRESENTS THE SIGNIFICANT DESIGN DECISIONS THAT SHAPE A SYSTEM, WHERE SIGNIFICANT IS MEASURED BY COST OF CHANGE.
Grady Booch
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A SYSTEM IS MORE THAN THE SUM OF ITS PARTS; IT IS AN INDIVISIBLE WHOLE. IT LOSES ITS ESSENTIAL PROPERTIES WHEN IT IS TAKEN APART.
Russell L. Ackoff
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BE PART OF THE TEAM
ACTIVITY OVER ROLE
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AS A TEAM
▸ Facilitating
▸ Collaborating
▸ Modelling
▸ Sharing
▸ Resolving
▸ Improving
▸ …
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INVOLVED IN CODE?
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YESEXPERIENCE THE SAME PAIN AS EVERYBODY ELSE ON THE TEAM
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▸ Support and coaching
▸ Best practices
▸ Code reviews
▸ Proof of Concepts
▸ Reusable building blocks
▸ Etc.
CODE
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SYSTEMSTAKEHOLDERSEVOLUTIONARYTEAM MEMBERINVOLVED IN
CODE
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VISUALArchitecture
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ONE CANNOT SEE THE OCEAN'S CURRENTS BY STUDYING DROPS OF WATER.
Grady Booch
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VISUALISATION - GOAL
▸ Consistency
▸ Reporting
▸ Checking and validation
▸ Sharing information
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VISUALISATION - GROUND RULES
▸ UML is usually not necessary
▸ Can be used for model-driven development
▸ Boxes and lines
▸ Be consistent
▸ Provide a legend
▸ Make sure stakeholders understand
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VISUALISATION - GROUND RULES
▸ Decision log
▸ Document your decisions and alternatives
▸ Avoid fluffy diagrams
▸ Avoid mixed abstractions
▸ Only document what’s useful
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WHY?Architecture
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WHY? UP-FRONT DESIGN
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UP-FRONT DESIGN
▸ Think about the big picture
▸ eg. used technology
▸ automation
▸ patterns (monolith, distributed, …)
▸ layering
▸ And it’s evolution
▸ But … be pragmatic
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JUST ENOUGH UP FRONT DESIGN TO CREATE FIRM FOUNDATIONS FOR THE SOFTWARE PRODUCT AND ITS DELIVERY.
Simon Brown
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JUST ENOUGH?
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JUST ENOUGH?
▸ Greenfield
▸ All the components of the system
▸ High-level
▸ Show the whole system
▸ Add details later
▸ White board diagram
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JUST ENOUGH? GREENFIELD
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JUST ENOUGH?
▸ Existing system
▸ As-is situation
▸ Domain of change
▸ Extension points
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WHY? COMMUNICATION
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02
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COMMUNICATION
▸ During inception
▸ Many stakeholders
▸ Many desires
▸ Many questions …
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▸ During development process
▸ Sharing a technical vision
▸ Everybody collaborates to the same end-goal
▸ Leave your ego at the door
COMMUNICATION
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WHY? POLITICS
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01
02
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POLITICS
▸ Decisions
▸ Stakeholders will question many decisions
▸ Focus on system integrity
▸ Fear of change at corporate IT
▸ Creating systems “nobody wants to touch”
▸ Play the game …
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WHY? MAKE DECISIONS EXPLICIT
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03
01
02
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HOW?Architecture
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OODA
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OBSERVE
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ORIENT
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DECIDE
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ACT
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OODA - EXAMPLE
▸ Context view
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▸ Context view
OODA - EXAMPLE
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OODA - EXAMPLE
▸ Context view
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▸ Context view
OODA - EXAMPLE
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▸ System composition
▸ Measuring value
▸ Application-driven
▸ Capturing data
RUNTIME OBSERVATIONS
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READING MATERIAL
▸ Software Systems Architecture by Rozanski and Woods▸ 37 Things One Architect Knows About IT Transformation by Gregor
Hohpe▸ Continuous architecture by Pureur and Erder▸ Bredemeyer consulting - http://www.bredemeyer.com/ ▸ Form follows function - https://genehughson.wordpress.com/ ▸ A trace in the sand - http://www.ruthmalan.com/Journal/
JournalCurrent.htm ▸ Coding the architecture - http://www.codingthearchitecture.com/ ▸ Continuous architecture in practice - https://pgppgp.wordpress.com/ ▸ Who needs an architect? - http://martinfowler.com/ieeeSoftware/
whoNeedsArchitect.pdf
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THANK YOU@DAGGIEBE