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sUpPORt c O n S T a N t cHAnGe cHAnGe cHAnGe nealford.com - - PowerPoint PPT Presentation

Sep 17, 2023 40 likes •752 views

cHAnGe sUpPORt c O n S T a N t cHAnGe cHAnGe cHAnGe nealford.com @neal4d to make di ff erent in some particular to undergo a modi fi cation of to give a di ff erent position, course, or direction to cHAnGe to replace with another to make a

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cHAnGe

cHAnGe

sUpPORt c O n S T a N t cHAnGe

nealford.com @neal4d

cHAnGe

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cHAnGe

to make different in some particular to make radically different to give a different position, course, or direction to to replace with another to make a shift from one to another to undergo a modification of

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cHAnGe

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bUSineSs dRiVEn

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bUSineSs dRiVEn

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bUSineSs dRiVEn

tEcHnoLoGy DriVEn

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dYNaMic eqUiLiBRiuM

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SLIDE 9 ¯

dYNaMic eqUiLiBRiuM

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How is long term planning possible when things constantly change in unEXpECtEd ways? unEXpECtEd unEXpECtEd

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everything in architecture is a tradeoff

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code use, reuse, & abuse reuse

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SLIDE 13 John D. Cook http://www.johndcook.com/blog/2011/02/03/lego-blocks-and-organ-transplants/

Software reuse is more like an organ transplant than snapping together Lego blocks.

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two reuse solutions

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ESB-driven SOA

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SLIDE 16 auto and homeowners insurance division commercial insurance division casualty insurance division life insurance division disability insurance division travel insurance division customer customer customer customer customer customer customer service
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The more reusable something is, the less usable it is.

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reuse coupling

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ESB-driven SOA

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microservices architecture

api layer client requests client requests client requests service component module module
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service component

module module

service component

module module
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service templates/sidecars

service component

module module logging monitoring A&A http://www.dropwizard.io/ https://projects.spring.io/spring-boot/
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the rise of service meshes

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the rise of service meshes

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the rise of service meshes

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SLIDE 27 service component module module service component module module

the rise of service meshes

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the rise of service meshes

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everything in architecture is a tradeoff

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Last 10% Trap

“Users always want 100% of what they want (& are never satisfied with less).”

80%

what the user wants

10% 10%

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What Happened to the 4GLs?

DSL

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see also: Vendor King Anti-pattern

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Current 10% Trap?

serverless

“low code” environments

? !

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sUpPORt cOnSTaNt cHAnGe

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ConStRAinT

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SLIDE 37 snowflake servers

Not a good kind

  • f vAriABiLitY
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reMoVe vAriAbiLitY

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kNigHt cApiTaL

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SLIDE 40 “bankrupt in 45 minutes” dougseven.com/2014/04/17/knightmare-a-devops-cautionary-tale/
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governance

Architectural

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SLIDE 42 @neal4d nealford.com @patkua @rebeccaparsons
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Evolutionary Architecture

An evolutionary architecture supports guided, incremental change across multiple dimensions.

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Evolutionary Architecture

An evolutionary architecture supports guided, incremental change across multiple dimensions. guided

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guided

An architectural fitness function provides an

  • bjective integrity assessment of some

architectural characteristic(s).

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Cyclic Dependencies

clarkware.com/software/JDepend.html application
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Governing Layered Architecture

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ArchUnit

https://www.archunit.org/

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ArchUnit

https://www.archunit.org/

layer dependency

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Legality of Open Source Libraries

Penultima⬆e
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Legality of Open Source Libraries

Penultima⬆e
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Legality of Open Source Libraries

Penultima⬆e
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Legality of Open Source Libraries

Penultima⬆e
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incremental

Production survey shipping catalog star rating improved star rating commit/ unit test 01001001010101 01010101010101 00101010010010 00100100010001 functional test UAT staging database unit tested code functionally tested code deployed code
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Deployment Pipeline + Fitness Functions

commit/ unit test 01001001010101 01010101010101 00101010010010 00100100010001 functional test UAT holistic fitness functions database atomic fitness functions unit tested code functionally tested code architecturally tested code deployed quantum integration environment
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evolutionary architecture governance

replicating CI 01001001010101 01010101010101 00101010010010 00100100010001 containerize & deploy database atomic fitness functions database holistic fitness functions database deploy to production EA fitness functions Security fitness functions
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sUpPORt cOnSTaNt cHAnGe

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incremental

Production survey shipping catalog star rating improved star rating commit/ unit test 01001001010101 01010101010101 00101010010010 00100100010001 functional test UAT staging database unit tested code functionally tested code deployed code
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moVe faSt & fiX tHiNgs

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SLIDE 60 https://github.com/github/scientist
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▫︎ It decides whether or not to run the try block, ▫︎ Randomizes the order in which use and try blocks are

run,

▫︎ Measures the durations of all behaviors, ▫︎ Compares the result of try to the result of use, ▫︎ Swallows (but records) any exceptions raised in the try

block

▫︎ Publishes all this information.

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4 days 24 hours/ no mismatches or slow cases > 10,000,000 comparisons > 10,000,000 comparisons

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sUpPORt cOnSTaNt cHAnGe

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sUpPORt cOnSTaNt cHAnGe remove needless variability

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sUpPORt cOnSTaNt cHAnGe automation = platform

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sUpPORt cOnSTaNt cHAnGe everything is a tradeoff

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sUpPORt cOnSTaNt cHAnGe

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SLIDE 71 nealford.com @neal4d

nealford.com/books nealford.com/videos

www.oreilly.com/software-architecture-video-training-series.html