MySQL
slave HDFS
ac6ve PHP Play
API Apache Play
Push HDFS
standby MySQL
master PHP iOS Android Memcached Play
API Apache Play
Push Memcached Play Apache api
02 LB LB Play Apache assets
01 assets
02 api
01 Legacy Backoffice
tool Shared
digital
assets
repository SUMO
DB Torikumi
Video Torikumi
Video Torikumi
Video Torikumi
Video Torikumi
Video Torikumi
Video Torikumi
Video SUMO
data
Familiar Story A Service needs to keep evolving. But It’s hard to maintain middle, large software without static-typed. Test is not enough for error detection Tests is written by human vs Cost
Familiar Story A Service needs to keep evolving. But It’s hard to maintain middle, large software without static-typed. Test is not enough for error detection Tests is written by human vs Cost We need type-safety dev environment to keep evolving software
Improving our programming skills • Scala is multi paradigm language • Scala has many concepts • Programmers can get many new perspectives OOP FP Trait Monad Object Typed Class Actor
How we learned Scala? • Toy Project Try & Error in irresponsible project It was terrible code…. • Reading Circle Programming Scala 2nd Edition 1 hour / day in our office thx @daneko0123
Design Decisions • Domain Driven Design • Mental Model = Language = Communication = Codes • Make Understandability & Clarity & Extensibility for SUMO specific specifications as code • Hybrid App (Web/Native) • Change content without AppStore/Google Play • Microservices • Separate concerns like PUSH notification.
class RikishiProfile( id: Int, shikona: String, shikonaYomi: String, birthplace: String, thumbnail: Option[RikishiThumbnail], val shikonaFull: String, val shikonaYomiFull: String, val heya: Option[Heya], val realName: String, val birthDay: LocalDate, val age: Int, val height: Float, val weight: Float, val banzuke: Option[Banzuke], val kakuzuke: Option[Kakuzuke], val prizeWinningStats: PrizeWinningStats) extends RikishiBaseProfile( id, shikona, shikonaYomi, 力士
Microservices Play
SUMO
REST
API Play
Push
No&fica&on
API Old
PHP
Backoffice
Tool Amazon
SNS hEp:9000 hEp:9001 hEp:9001 Generic
Push
No&fca&on
Service SUMO
Domain SUMO
Domain
Microservices Play
SUMO
REST
API Play
Push
No&fica&on
API Old
PHP
Backoffice
Tool Amazon
SNS hEp:9000 hEp:9001 hEp:9001 Generic
Push
No&fca&on
Service SUMO
Domain SUMO
Domain Isolate generic functionality
ScalikeJDBC • Good • Just SQL … Avoid unnecessary abstraction. Good for existing system. • Type-Safe … QueryDSL • Bad • Development resource? → NO!!!! • ConnectionPoolSetting is not flexible (… well, we can submit pull request) • Note • Slick is looks like cool. But we don’t want to translate complex SQL queries to Scala code.
Twirl • Excellent! • Type-Safety… Prevent many errors at compile time. • Don’t be afraid to change method/property signature !!! • Good • Flexibility … Just Scala • Bad • Flexibility … Just Scala, Unfriendly for designers • Slow Feedback Cycle … Slow compilation… We developed initial templates without twirl using Grunt etc. • Note • I think better of this than I did before
Twirl • Excellent! • Type-Safety… Prevent many errors at compile time. • Don’t be afraid to change method/property signature !!! • Good • Flexibility … Just Scala • Bad • Flexibility … Just Scala, Unfriendly for designers • Slow Feedback Cycle … Slow compilation… We developed initial templates without twirl using Grunt etc. • Note • I think better of this than I did before Should be evaluated!?
Scaldi • Good • minimum & simple • Bad • Verbose declaration ! • Dynamic … You won’t get an error until you run your application • Note • The cake pattern seems quite verbose for me. • Next, I’ll look for other solution. (like Play! 2.4 DI) class FooService(implicit inj: Injector) extends Injectable Fixed after presentation: use constructor injection! instead of this. It’s simple!
ScalaTest • Good • Simple … vs Specs2. Specs2 provides several notations that seems not simple for me. • Bad • Limited structuring texts … vs RSpec. No context etc… • Note • Well… Either way
I don’t know Scala way… But our policy is below. try catch Option Try Either (Validation,Either etc../scalaz) No explanation needed Do not use generally (Java world syntax) Use this for exception handling! < Scala 2.10 Use error handling except exceptions. …
1. Use Load Balancer API 2. Implement Server Status API /w LB 3. Pray to implement graceful restart in the future ;p 4. Others… Do you have any ideas? Solution? Non-Stop Deployment
1. Use Load Balancer API 2. Implement Server Status API /w LB 3. Continue to pray to implement graceful restart in the future 4. Others… Do you have any idea? Solution? Non-Stop Deployment
Deployment Flow Non-Stop Deployment 1. Remove Node from LB via LB API ↓ 2. Deploy to detached Node new app. ↓ 3. Waiting for start ↓ 4. Add Node to LB via LB API ↓ 5. Repeat… !
• Pure asynchronous • for Non-Blocking app • Highly synchronous • for Blocking app • Many specific thread pools • Hybrid • Few specific thread pools • Hybrid Tuning Practices Tuning hread Pool
• SUMO app is powered by Scala/Play! • Type-Safety world makes great safety & productivity. • Scala is suited for long-maintained or middle-large applications. • I worry about binary compatibility Summary
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