microservices, iot, and agile… - goto conference...•microservices –mid-2000’s •programmer...
TRANSCRIPT
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Fred George
Copyright © 2016 by Fred George. All rights reserved. 3
• Technologist
• Computer networks – 70’s
• Token Ring LAN – 80’s
• GUI’s – late 80’s
• OO – late 80’s
• Agile – late 90’s
• MicroServices – mid-2000’s
• Programmer• Since 1968 (Basic)
• 65,000 hours experience
• 70+ languages
• Computer Science Degree 1973
• Manager• 17 years IBM
• Business degree, MIT Sloan School 1986
• Product Owner, IBM
• VP, ThoughtWorks
• Co-founder, Outpace (Silicon Valley)
• Senior Advisor to 3 tech companies
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Requirements Uncertainty
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CertaintyUncertainty
Y2k Agile
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Fuzzy vs. Traditional Problems
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Simple
Complicated
ChaoticCause a Effect
Cause aaa Effect
Effect? Cause?
Cause ? Effect
Disorder
Complex
Cynefin (kun-ev-in)
Dave Snowden – HBR & YouTube
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Chaotic
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Simple
ComplicatedComplex
Cynefin (kun-ev-in)
Dave Snowden – HBR & YouTube
Fuzzy vs. Traditional Problems
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Requirements Uncertainty
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CertaintyUncertainty
,but viable
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Age of Agents• Assistive technologies abound
• Google Home, Siri, Alexa, Cortana, …
• Real innovation not voice, but interaction of backing services
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Home IoT Demonstration
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Copyright © 2017 by Fred George. All rights reserved. 12
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•What’s the business case?
•Why bother?
• High volume potential
• Bellwether for ease of use
• Fun!
Is Home IoT Interesting?
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Home IoT Hub Contenders
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Amazon Echo
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Google Home
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Xbox One
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Apple TV
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Phillips Hue Bridge
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Samsung Refrigerator
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Home IoT Morass
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MicroServices to the Rescue!
•Uncertainty, so Let’s Play!
•Isolate volatility; optimize replaceablity
•Changing devices
•Evolving protocols
•Layer functionality on functionality
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• Less common than Synchronous
• Consistent with Reactive and Agent-based
• Very, very…
• Small
• Loosely coupled
• Rapidly deployable
• RESTful with registration not required
• Compatible with experimentation
Asynchronous MicroServices
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Rapids, Rivers, and Ponds
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Need Pattern for Asynchronous
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Bus
ServiceService
Service
Need
Need
Need
Sol’n’sSol’n
•Variants easy
•Graceful degradation
Choose Sol’n
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Incremental Applications
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Event Bus
Rental offers
Car rent
Legacy server
Brand offers
Location offers
Segmentation
Membership
CarRent.com Login
Sally
A B
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• RabbitMQ for event bus (in pub-sub)
• Simpler than Kafka
• Good enough
• JSON
• XML < JSON < compact_binary
• Docker containers; Swarm hosts
• ToDo: Commodity Linux boxes
Technology Choices
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Architectural Principles
• Uncertainty => Just-in-Time Design
• Behavior-Oriented Services
• Services as small as possible with kick
• Publish conclusions
• If you do something interesting, publish!
• Reliability through:
• Idempotency – do it again!
• Redundancy – buses, messages, services, hosts
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Framework from MicroServices Workshop
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Framework from MicroServices Workshop
Copyright © 2017 by Fred George. All rights reserved. 30
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Framework from MicroServices Workshop
Copyright © 2017 by Fred George. All rights reserved. 31
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Framework from MicroServices Workshop
Copyright © 2017 by Fred George. All rights reserved. 32
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Framework from MicroServices Workshop
Copyright © 2017 by Fred George. All rights reserved. 33
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Framework from MicroServices Workshop
Copyright © 2017 by Fred George. All rights reserved. 34
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Framework from MicroServices Workshop
Copyright © 2017 by Fred George. All rights reserved. 35
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Architecture: Hardware
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IoT Hardware
Device API
Scene API
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Add Event Bus
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Event Bus
IoT Hardware
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Tier 1: Hardware Access
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Event Bus
IoT Hardware
Tie
r 1
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Tier 2: Scenes
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Event Bus
IoT Hardware
Tie
r 1
Tie
r 2
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Tier 3: Reactive Services
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Event Bus
IoT Hardware
Tie
r 1
Tie
r 2
Tie
r 3
e.g., ToD + Motion => Set Scene
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MetaServices: Monitor
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Event Bus
IoT Hardware
Tie
r 1
Tie
r 2
Tie
r 3
Mo
nit
or
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MetaServices: Detection
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Event Bus
IoT Hardware
Tie
r 1
Tie
r 2
Tie
r 3
Mo
nit
or
Erro
rD
etct
ion
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MetaServices: Correction
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Event Bus
IoT Hardware
Tie
r 1
Tie
r 2
Tie
r 3
Mo
nit
or
Erro
rC
orr
ect
ion
Erro
rD
ete
ctio
n
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Maintaining State
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Insistent Service
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Choreography Sticky Colors
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BusHue HW
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Choreography Sticky Colors
Copyright © 2017 by Fred George. All rights reserved. 46
BusHue HW hue_state
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Choreography Sticky Colors
Copyright © 2017 by Fred George. All rights reserved. 47
BusHue HW hue_state
*
…
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Choreography Sticky Colors
Copyright © 2017 by Fred George. All rights reserved. 48
BusHue HW hue_state
*
…
hue_be_state
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Choreography Sticky Colors
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Switch Bus Light sceneHue HW hue_state hue_be_state
…
*
……
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Choreography Sticky Colors
Copyright © 2017 by Fred George. All rights reserved. 50
Switch Bus Light scene DashboardHue HW hue_state hue_be_state
*
……
……
…
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Observations
•Lots of messages
•No RESTful interfaces between services
•No constraints on multiple instances/versions
•Unit tests not required
•Fast-failing system rather than acceptance tests
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•Feedback
•Communication
•Simplicity
•Courage
•Respect
XP Values at Work
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Agile Practices and Roles
• Stand ups
• Story narratives
• Retrospectives
• Estimates
• Iterations
• Mandatory
pairing
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• Unit tests
• Acceptance tests
• Refactoring
• Patterns
• Continuous integration
• BA
• Developer
• Architect
• SCRUM master
• QA
• Manager
• Customer
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• Stand ups
• Story narratives
• Retrospectives
• Estimates
• Iterations
• Mandatory
pairing
Agile Practices and Roles
Copyright © 2017 by Fred George. All rights reserved. 54
• Unit tests
• Acceptance tests
• Refactoring
• Patterns
• Continuous integration
• BA
• Developer
• Architect
• SCRUM master
• QA
• Manager
• Customer
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,but viable
Requirements Uncertainty
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CertaintyUncertainty • Idea-focused features• Full-stack developers• Fast failure systems• MicroServices• Event-based architecture• Continuous deployment
• Stories• Specialists• TDD• Acceptance tests• Migration scripts
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Future: More Devices
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Future: Excel for Home IoT:
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Future: Docker on Raspberry Pi
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MicroServices, IoT, and
Fred George
@fgeorge52
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