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Martin Lippert, Spring Tools Lead & Sustainability Ambassador @ VMware June 2023 Invited Talk TU Dortmund

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Why are you here?

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Who am I ?

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Software Engineer

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Spring Tools Lead

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No content

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VMware Apple Google Xerox PARC Stanford University Meta Intel Tesla

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How I started

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Schneider CPC 664 Z80 processor @ 4Mhz, 64 KB RAM https://de.wikipedia.org/wiki/Amstrad_CPC#/media/Datei:Schneider_664_en.jpg 1985

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Atari 1040 ST Motorola 68000 processor @ 8Mhz, 1024 KB RAM @ Bill Bertram, 2006, https://de.wikipedia.org/wiki/Atari_ST#/media/Datei:Atari_1040STf.jpg

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Atari TT 030 Motorola 68030 processor @ 32Mhz, 4 MB RAM https://de.wikipedia.org/wiki/Atari_TT#/media/Datei:Atari_TT030.JPG

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Apple Power Macintosh 6100 PowerPC 601 @ 60Mhz, max 72 MB RAM MIKI Yoshihito - https://www. fl ickr.com/photos/mujitra/13981566927/

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On the software side?

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No content

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Today

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Software is everywhere

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Software changes the world

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How to develop truly great software?

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Structure

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Design Patterns Elements of Reusable
 Object-Oriented Software by Erich Gamma, Richard Helm, Ralph Johnson, John Vlissides

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Refactoring Improving the Design of Existing Code by Martin Fowler

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Feedback Cycles

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JUnit

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Test-Driven Development

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Test Driven Development By Example by Kent Beck

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User Feedback

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"Real Artists Ship" Steve Jobs

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Agile Software Development

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Extreme Programming Explained by Kent Beck

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Distributed Systems

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APIs and Evolution

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Eat Your Own Dogfood

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Test at scale

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"Hello World" always work

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Massive amounts of data

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public long calculate(List orders) { long sum = 0; for(int i = 0; i < orders.size(); i++) { sum += orders.get(i).getPrice(); } return sum; } What is the problem here?

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Complexity Matters

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t(n) = n6 vs. t(n) = 2n 103 machines in parallel 109 operations per second n = 100 1s universe doesn’t exist long enough

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"software is getting slower more rapidly than hardware is becoming faster" Wirth’s Law

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Back to the beginning

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Running on Motorola 68030 processor @ 32Mhz, 4 MB RAM

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What comes next?

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Vulnerabilities CVEs are now part of your daily life

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GenAI (probably more ML + LLM than intelligence)

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Decarbonization super important

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"The best way to predict the future is to invent it" Alan Kay

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Thank You for listening Martin Lippert @martinlippert