Android Engineering for Scale

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Android Engineering for Scale Jamie McDonald

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What is scale? In the context of mobile development title, date, 01 of 10

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Subtitle 4M Android downloads / month 175M monthly listeners title, date, 01 of 10

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title, date, 01 of 10

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title, date, 01 of 10 Codebase

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Ball of Mud title, date, 01 of 10

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Layered Architecture title, date, 01 of 10

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Featurised Architecture title, date, 01 of 10

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Layers

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Feature Packages

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Feature Packages STREAM StreamAdapter StreamFragment StreamModule StreamOperations StreamStorage StreamItemPresenter

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Lava Layers title, date, 01 of 10 “Successive, well intentioned, changes to architecture throughout the lifetime of an project can lead to a fragmented and hard-to- maintain code base” The Lava Layer Anti-pattern

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SPOCCER Screen Presenter Operations Controller Command EntityState Repository

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Subtitle Reactive Programming title, date, 01 of 10 Rx

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Branches title, date, 01 of 10 <> branch <> master <> origin/master

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master Branch by Abstraction title, date, 01 of 10 abstraction layer <> <> Martin Fowler: Branch by Abstraction

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master Branch by Abstraction title, date, 01 of 10 abstraction layer <> Martin Fowler: Branch by Abstraction

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master Branch by Abstraction title, date, 01 of 10 <> Martin Fowler: Branch by Abstraction

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master Trunk-based Development title, date, 01 of 10 feature-B .isEnabled() .isEnabled() feature-A .isEnabled() feature-C Trunk-based Development

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if (flags.isEnabled(Feature.BRAND_NEW_FEATURE)) { return newThing; } else { return oldThing; } title, date, 01 of 10 Feature Flags

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Modules title, date, 01 of 10 MAIN REPO SINGLE REPO ANDROID-KIT PROPELLER LIGHTCYCLE SKIPPY PLAYER

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Users title, date, 01 of 10

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Subtitle End-to-End Development title, date, 01 of 10

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Android iOS SoundCloud API

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API Mobile Mobile API Android iOS

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Subtitle title, date, 01 of 10 { "id":612849, "kind":"user", "permalink":"bazan", "username":"David Bazan", "uri":"https://api.soundcloud.com/users/612849", "permalink_url":"http://soundcloud.com/bazan", "avatar_url":"https://i1.sndcdn.com/avatars-000030728315- oe5uld-large.jpg?e76cf77", "country":"United States", "first_name":"David", "last_name":"Bazan", "full_name":"David Bazan", "description":"Known for his work fronting the enigmatic rock band Pedro the Lion, David Bazan\u2019s emotionally charged narratives, eye for telling detail, and mournful voice have more in common with J.D. Salinger\u2019s \u201cNine Stories\u201d or Flannery O\u2019Connor\u2019s \u201cWise Blood\u201d than with the usual lyrical slant of popular music. Bazan is a gifted storyteller, weaving parables of spiritual conflict, suburban ennui, and personal surrender into magnetic, well-crafted songs.\r\n\r\nHis debut solo full-length album, Curse Your Branches (out now on Barsuk), is a masterwork by a modern American poet at the height of his powers. Paste Magazine called him one of the \u201c100 Best Living Songwriters\u201d. This record is the deepest and most explicit exploration of his struggles with faith and a meditation on all things passed between the generations.", "city":"Seattle", [...] } { "collection":[ "hip hop", "chill", "electronic", "deep house", "party", "love", "rap", "happy", "study", "techno", "indie rock", "dubstep", "r&b", "relax", "country", "pop", "edm", "reggae", "house", "workout", "soundtrack", "reggaeton", "piano", "dance", "remix", "alternative", "summer", "instrumental", "rock", "morning", "funk", "classical", [...] } SoundCloud API Mobile API

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Staying Connected

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Team title, date, 01 of 10

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Mobile Team Other Engineering Android iOS Platform Teams

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Feature Teams Core Engineering Android iOS

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Core Engineering Android iOS Feature Teams

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title, date, 01 of 10

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title, date, 01 of 10

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Enabling Involvement

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Subtitle Collective Values title, date, 01 of 10

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title, date, 01 of 10 Pairing & Pull Requests

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title, date, 01 of 10 ACCEPTANCE TEST UNIT TEST CODE

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Subtitle title, date, 01 of 10 @Inject @LightCycle ActionBarUtil actionBarUtil; @Inject @LightCycle PlayerController playerController; public MainActivity() { [...] } Unit Testing

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title, date, 01 of 10 Acceptance Testing

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Release Train title, date, 01 of 10 BETA 257 258 259 258-beta 259-beta RELEASE

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title, date, 01 of 10 UNIT TESTS BUILD PROMOTE ACCEPTANCE TESTS Continuous Integration

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title, date, 01 of 10 Featurised, layered architecture Shared practices: reactive programming Feature teams & end-to-end development Shared values: testing Trunk-based development Summary

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soundcloud.com/jobs Thank you, NYC!