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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! Controlling complexity for large iOS projects Petro Korienev, iOS Engineer @ Techery

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! • Sporadic crashes • Intermittent issues • Hardly debuggable code PROBLEMS WHILE SCALING

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! • Result of deadlines pressure • Result of miscommunication • Result of laziness Growing number of dependencies and borrowed code

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! pod install…

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! • Complexity growth with time SO,

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! • Control decreases over time • Consequence of growing complexity • Maintainer change • Software is not an IP carrier, author is

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! FEW SLOC FACTS

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! CLOC ON MY CURRENT PROJECT

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! CLOC ON ITS PODS FOLDER

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! Few more numbers • Currently 11 iOS developers • 3 full-stack feature teams • 6 backend services + different environments • Analytics, perf monitoring, etc

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! Backend collaboration architecture

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! Backend collaboration architecture

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! Backend collaboration architecture

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! Monolithic vs Microservice

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! What to do

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! Here comes TRUST

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! • Trust in community and time-proven solutions • Trust in self TRUST

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! • AFNetworking 2.5.1-2.5.2 • OpenSSL heartbleed • Numerous zero-day exploits • Just bugs TRUST IN COMMUNITY

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! • “I’ve seen stuff like this before” • “This is pretty straightforward” • “If i’d do stuff like this, i’d do this way” TRUST IN SELF

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine !

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! • Bugs • Exploits • Limitations • Tech debt Consequences

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! Prefer control over trust CAPTAIN’S VOICE:

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! SOLUTIONS 1. Blackboxing 2. Whiteboxing 3. Grayboxing

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! BLACKBOXING - DON’T CARE OF IT • Simple • Unreliable • Tends to consume time when scaling

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! DON’T CARE OF IT

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! WHITEBOXING

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! WHITEBOXING • Very time-consuming • Reliable after certain effort put • Extremely difficult with closed- source

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! GRAYBOXING • Good tradeoff between white- and blackboxing • Flexible • Applicable almost everywhere • Dynamic

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! GRAYBOXING • Idea is to find a right place and inject something validating the correctness of contract • Unlike unit tests, verifies dynamic, run-time behaviour

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! EXAMPLE • https://github.com/soxjke/ WatchDogs

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! PROBLEM • Inconsistency and mess within CoreData across the project • Fake certainty in thread- access

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! SOLUTION AND DEMO

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! STEPS • Define problem places • Define ways to inject • Define ways to control

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! Define problem places • NSManagedObjectContext save • NSManagedObject getter/setter • Everything should run in context queue

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! Define ways to inject • swizzle save • swizzle setter/getter?

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! Define ways to inject • swizzle resolveInstanceMethod • use seamless swizzling

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! Define ways to control • swizzle NSManagedObjectContext init • dispatch_set_specific

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! THANK YOU FOR YOUR ATTENTION! Q&A TIME

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! #cocoaheadsukraine 29/Jun/2016 @ Sigma Software, Kharkiv, Ukraine ! YOU CAN FIND ME: • https://github.com/soxjke • http://stackoverflow.com/users/ 2392973/petro-korienev • https://www.facebook.com/soxjke • https://twitter.com/soxjke