Scala in the Enterprise
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This document summarizes experiences using Scala in the enterprise. Key points that have worked well include improved productivity from Scala's concise code, interoperability with Java libraries, type inference, and functional programming features like collections, lambdas, traits, and actors. Some complaints are around tooling support in Eclipse and IDEA, lack of serialization for collections, and inability to write classfile annotations in Scala. Areas being explored further include options for failure handling, Scala DSL frameworks, and functional programming libraries.
Scala in the Enterprise
- 1. Scala in the Enterprise
- 2. Intro • Eric Pederson – ericacm@gmail.com / @ericacm – Background in Java, Groovy, Javascript, PHP, etc. • Consulting at NYSE – One Scala app in production, one in QA – Contract finished 1Q11
- 3. Platform • JDK 1.6 • Scala 2.8 – Started development in March – 2.8 was bundled with Intellij IDEA • Using lots of Java libs – Spring, Hibernate, CXF, Mule, ApacheMQ – Bouncycastle, OpenSAML, Velocity, etc, etc. • Only Scala lib currently in use is ScalaTest
- 4. What’s been working well • Improved productivity • Concise code • Java interop • Type inferencing • REPL (mvn scala:console) • Collections API – Especially higher ordered fns (map/filter/etc) • Lambdas / Closures – Prevents proliferation of classes
- 5. What’s been working well • Mixins / trait stacking – trait UserIdentifierCmd extends ApiKeyCmd {..} – trait RoleIdCmd extends ApiKeyCmd {..} – object cmd extends UserIdentifierCmd with RoleIdCmd {..} • For comprehenions / expressions • Case classes / pattern matching • Actors • Type aliases • Structural (duck) typing • Import aliases
- 6. Complaints • Eclipse support is weak • Lack of type inferencing in IDEA • Collections are not serializable • Cannot write classfile annotations in Scala • Would like Groovy style .? null short circuiting
- 7. Complaints • Someone needs to write a “FP in Scala” book – Plenty of literature using Haskell – Blog posts here and there on advanced Scala FP – scalaz is looking promising in this area – Something like “Learn you a Haskell for Great Good” plus an in-depth discussion on scalaz.
- 8. Currently looking at • Lift “Box” or similar – Options don’t include failure info – scalaz Validation • http://applicative-errors- scala.googlecode.com/svn/artifacts/0.6/html/index.html – http://www.milessabin.com/misc/Chain.scala • Camel – To replace Mule – Scala DSL, Akka integration • Scalate / SSP • scala-time • scalaz