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Hanging on in Quiet Desperation: @markhibberd Time & Programming

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Ticking away the moments that make up a dull day. You fritter and waste the hours in an offhand way. … And then one day you find ten years have got behind you. No one told you where to run, you missed the starting gun.” - Roger Waters “

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Complexity.

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1986.

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Changeability. Conformity. Complexity. Invisibility.

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2006.

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2011.

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Present Day.

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1948.

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1958-1963.

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The big idea.

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If we can reason about all the states of a system.

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And we can understand how each state is arrived at.

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We can make better decisions, and start to unwind the interdependencies and complexity caused by time and ordering.

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Present Day.

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2004-2006.

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Disconnected networks.

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{dock:0 ,red:0 ,purple:0} {dock:0 ,red:0 ,purple:0} {dock:0 ,red:0 ,purple:0} owner|id|item|count red |0 |x |99 red |1 |y |1 dock |2 |z |33

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{dock:3 ,red:0 ,purple:0} {dock:0 ,red:0 ,purple:1} {dock:0 ,red:7 ,purple:0}

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{dock:5 ,red:0 ,purple:0} {dock:0 ,red:7 ,purple:1} {dock:0 ,red:7 ,purple:1}

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{dock:5 ,red:0 ,purple:0} {dock:3 ,red:7 ,purple:1} {dock:0 ,red:7 ,purple:1}

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{dock:7 ,red:7 ,purple:3} {dock:7 ,red:7 ,purple:3} {dock:0 ,red:8 ,purple:1}

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{dock:7 ,red:8 ,purple:3} {dock:7 ,red:8 ,purple:3} {dock:7 ,red:8 ,purple:3}

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2009-2010.

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The most complex system I ever worked on.

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A web API with 2 resources.

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POST /activate POST /check Call to activate a product, validate and register license details Check license and validate installation details.

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What could possibly go wrong?

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POST /activate POST /check

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POST /activate POST /check POST /check2007

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POST /activate?magik=true POST /check POST /check2007

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POST /activate?magik=true POST /check POST /check2007 POST /activatev3

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POST /activate?magik=true POST /check POST /check2007 POST /activatev3 POST /check9

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POST /activate?magik=true POST /check POST /check2007 POST /activatev3 POST /activate-new POST /check9

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POST /activate?magik=true POST /check POST /check2007 POST /activatev3 POST /activate-new?legacy=1 POST /check9

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POST /activate?magik=true POST /check POST /check2007 POST /activatev3 POST /activate-new?legacy=1 POST /check9

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POST /activate?magik=true POST /check POST /check2007 POST /activatev3 POST /activate-new?legacy=1 POST /check9

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POST /activate?magik=true POST /check POST /check2007 POST /activatev3 POST /activate-new?legacy=1 POST /check9

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POST /activate?magik=true POST /check POST /check2007 POST /activatev3 POST /activate-new?legacy=1 POST /check9

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From: https://stripe.com/blog/api-versioning

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2013-2017.

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Full circle. A machine learning problem.

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We need to describe the world, now and in the past.

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cause(π)(α)

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at(I)(desk)

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at(I)(desk) at(desk)(home)

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at(I)(desk) at(desk)(home) ∴ at(I)(home)

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TX CUSTOMER ITEM AMOUNT TIMESTAMP 1 X0001 Pen $5 2016-08-01T12:24:13 2 X0001 Notepad $20 2017-01-01T02:19:01 3 X0002 Calculator $55 2015-01-01T09:55:21 4 X0003 Book $30 2017-07-01T15:34:53

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CUSTOMER LOCATION X0001 NY X0002 SINGAPORE X0003 HONG KONG X0004 SYDNEY X0005 SYDNEY

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CUSTOMER LOCATION TIMESTAMP X0001 NY 2016-08-01T00:00:00 X0002 SINGAPORE 2017-08-04T00:00:00 X0003 HONG KONG 2016-01-21T00:00:00 X0004 SYDNEY 2016-08-01T00:00:00 X0005 SYDNEY 2014-12-24T00:00:00

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CUSTOMER LOCATION TIMESTAMP X0001 NY 2016-08-01T00:00:00 X0002 SINGAPORE 2017-08-04T00:00:00 X0003 HONG KONG 2016-01-21T00:00:00 X0004 SYDNEY 2016-08-01T00:00:00 X0005 SYDNEY 2014-12-24T00:00:00 X0001 LONDON 2017-09-07T00:00:00

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What is in a time?

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World Time System Time

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When is this fact valid? When did we learn this fact?

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Intervals. X0001 NY 2016-08-01T00:00:00 X0001 LONDON 2017-09-07T00:00:00

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Instants. 1 X0001 Pen $5 2016-08-01T12:24:13

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Horizons. 1 X0001 Pen $5 2016-08-01T12:24:13

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Horizons. 1 X0001 Pen $5 1234

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2013-2017.

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Operations as a system.

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This is complexity.

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Techniques!

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How does time impact the system?

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2014.

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towards annɛx

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Semantic versioning is not the whole story.

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Open world.

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Time matters.

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commit

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ci

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publish

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platform test

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production

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performance

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cve

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eminence boxer napoleon snowball

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boxer 1.2.1 commit: bd2f074…02 api-signature: […] feature: it-works artifact: tag: bin/boxer flags: […] address: e2f1…bc74

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:boxer :has :feature “multi-part-put” :has :commit “abcd-1345” :has :branch “master” :snowball :is :compatable-with atom/… :napoleon :semver >= 1.3 < 1.4 :no-cve +annex.example.com@HEAD

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Present Day.

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Artifacts over constructs.

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Time and ordering are out to get us.

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Techniques abound.

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If we can reason about all the states of a system.

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And we can understand how each state is arrived at.

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We can make better decisions, and start to unwind the interdependencies and complexity caused by time and ordering.

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Hanging on in Quiet Desperation: @markhibberd Time & Programming